JPH0695121B2 - Amplifier circuit output voltage setting device - Google Patents
Amplifier circuit output voltage setting deviceInfo
- Publication number
- JPH0695121B2 JPH0695121B2 JP63273786A JP27378688A JPH0695121B2 JP H0695121 B2 JPH0695121 B2 JP H0695121B2 JP 63273786 A JP63273786 A JP 63273786A JP 27378688 A JP27378688 A JP 27378688A JP H0695121 B2 JPH0695121 B2 JP H0695121B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- amplifier circuit
- output
- output voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 238000005259 measurement Methods 0.000 description 13
- 239000003990 capacitor Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Tests Of Electronic Circuits (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、増幅回路の出力特性を測定するための増幅
回路出力電圧設定装置に関するものである。The present invention relates to an amplifier circuit output voltage setting device for measuring output characteristics of an amplifier circuit.
従来、増幅回路の出力波形の歪率等の特性を測定する場
合に、増幅回路の出力電圧を一定に保持して出力特性の
測定を行わせる増幅回路出力電圧設定装置がある。Conventionally, there is an amplifier circuit output voltage setting device that holds the output voltage of the amplifier circuit constant and measures the output characteristic when measuring the characteristics such as the distortion rate of the output waveform of the amplifier circuit.
従来のこの種の増幅回路出力電圧設定装置の一例を第２
図に基づいて説明する。Second example of the conventional amplifier circuit output voltage setting device of this type
It will be described with reference to the drawings.
この増幅回路出力電圧設定装置は、第２図に示すよう
に、被測定増幅回路１に対して交流基準信号を入力する
基準信号源10と、制御入力電圧に応じて減衰量を変化さ
せる電圧制御減衰器12と、被測定増幅回路１の出力電圧
を直流電圧に変換する交流−直流変換回路３と、基準直
流電圧E0と交流−直流変換回路３の出力電圧との差を取
り、この差電圧を制御入力電圧として出力する差動増幅
器14とを備えている。v0は増幅回路の出力特性を測定す
る測定端子を示している。As shown in FIG. 2, the amplifier circuit output voltage setting device includes a reference signal source 10 for inputting an AC reference signal to the amplifier circuit under test 1 and a voltage control for changing the attenuation amount according to the control input voltage. The difference between the attenuator 12, the AC-DC conversion circuit 3 for converting the output voltage of the measured amplifier circuit 1 into a DC voltage, and the reference DC voltage E 0 and the output voltage of the AC-DC conversion circuit 3 is calculated. And a differential amplifier 14 that outputs a voltage as a control input voltage. v 0 indicates a measuring terminal for measuring the output characteristic of the amplifier circuit.
以下、この増幅回路出力電圧設定装置の動作を説明す
る。The operation of the amplifier circuit output voltage setting device will be described below.
基準信号源10は、電圧制御減衰器12の入力端子12aへ交
流基準信号を加える。電圧制御減衰器12は、制御電圧入
力端子12a′に加えられる制御入力電圧に応じて基準信
号源10から入力した交流基準信号の減衰量を制御して交
流基準信号の振幅を制御し、出力端子12bから被測定増
幅回路１の入力端子1aへ加える。被測定増幅回路１は、
電圧制御減衰器12からの振幅を制御された交流基準信号
を入力し、この交流基準信号を増幅して測定端子v0と交
流−直流変換回路３の交流入力端子3aに加える。交流−
直流変換回路３は、被測定増幅回路１の出力電圧を入力
し直流電圧に変換して差動増幅器14の反転入力端子14
a′に加える。差動増幅器14は、交流−直流変換回路３
から入力した直流電圧の値を、非反転入力端子14aに加
えられている基準直流電圧E0の値と比較し、直流電圧と
基準直流電圧E0との差を取り、この差電圧を制御入力電
圧として電圧制御減衰器12の制御入力電圧端子12a′に
加える。このとき、交流−直流変換回路３からの直流電
圧の値と基準直流電圧E0の値とが一致しないときは、差
動増幅器14から直流電圧と基準直流電圧E0との差電圧が
出力され、制御入力電圧として電圧制御減衰器２の制御
電圧入力端子12a′に加えられる。そして、電圧制御減
衰器12で交流基準信号の減衰量を制御入力電圧に応じて
制御し、被測定増幅回路１に加えられる交流基準信号の
振幅を制御入力電圧に対応した値だけ変化させる。これ
により、被測定増幅回路１の出力電圧の交流−直流変換
回路３で変換された直流電圧が基準直流電圧E0に等しく
なる。また、交流−直流変換回路３からの直流電圧の値
と基準直流電圧E0の値とが一致したときに、差電圧がな
くなり、差動振幅器14から出力電圧が出力されない。し
たがって、電圧制御減衰器12は、交流基準信号の振幅を
現振幅のまま被測定増幅回路１に加え、被測定増幅回路
１の出力電圧の振幅も変化しない。このようにして被測
定増幅回路１の出力電圧の振幅を基準直流電圧E0で決定
し、出力電圧の振幅を一定値に保持させるようにしてい
る。The reference signal source 10 applies an AC reference signal to the input terminal 12a of the voltage controlled attenuator 12. The voltage control attenuator 12 controls the amplitude of the AC reference signal by controlling the amount of attenuation of the AC reference signal input from the reference signal source 10 according to the control input voltage applied to the control voltage input terminal 12a ', and the output terminal 12b is added to the input terminal 1a of the measured amplifier circuit 1. The measured amplifier circuit 1 is
An amplitude-controlled AC reference signal from the voltage control attenuator 12 is input, this AC reference signal is amplified and added to the measurement terminal v 0 and the AC input terminal 3 a of the AC-DC conversion circuit 3. AC-
The DC conversion circuit 3 receives the output voltage of the amplifier circuit under test 1, converts it into a DC voltage, and inverts the input terminal 14 of the differential amplifier 14.
Add to a '. The differential amplifier 14 includes an AC / DC conversion circuit 3
The value of the DC voltage input from is compared with the value of the reference DC voltage E 0 applied to the non-inverting input terminal 14a, the difference between the DC voltage and the reference DC voltage E 0 is taken, and this difference voltage is input to the control input. It is applied as a voltage to the control input voltage terminal 12a 'of the voltage controlled attenuator 12. At this time, when the value of the DC voltage from the AC-DC conversion circuit 3 and the value of the reference DC voltage E 0 do not match, the differential amplifier 14 outputs the difference voltage between the DC voltage and the reference DC voltage E 0. , Is applied as a control input voltage to the control voltage input terminal 12a 'of the voltage controlled attenuator 2. Then, the voltage control attenuator 12 controls the attenuation amount of the AC reference signal according to the control input voltage, and changes the amplitude of the AC reference signal applied to the amplifier circuit under test 1 by a value corresponding to the control input voltage. As a result, the DC voltage converted by the AC-DC conversion circuit 3 of the output voltage of the measured amplifier circuit 1 becomes equal to the reference DC voltage E 0 . Further, when the value of the DC voltage from the AC-DC conversion circuit 3 and the value of the reference DC voltage E 0 match, the differential voltage disappears and the differential amplitude device 14 does not output the output voltage. Therefore, the voltage control attenuator 12 applies the amplitude of the AC reference signal to the amplifier circuit under test 1 without changing the current amplitude, and the amplitude of the output voltage of the amplifier circuit under test 1 does not change. In this way, the amplitude of the output voltage of the measured amplifier circuit 1 is determined by the reference DC voltage E 0 , and the amplitude of the output voltage is held at a constant value.
この増幅回路出力電圧設定装置は、測定初期状態におい
ては、被測定増幅回路１の出力電圧の立ち上がりが遅れ
るため、交流−直流変換回路３で変換された交流電圧の
出力の立ち上がりが遅れ、瞬時的に基準直流電圧E0との
差が大きくなる。したがって、差動増幅器14から瞬時的
に大きな差電圧が出力され、電圧制御減衰器12が交流基
準信号の減衰量を零となるように制御する。また、交流
基準信号に低周波信号を用い、被測定増幅回路１の出力
電圧を最大出力電圧（出力波形がクリップする付近）に
設定する場合には、被測定増幅回路１の利得のばらつき
を考慮して、基準信号源10の交流基準信号の大きさに余
裕を持たせ、さらに交流−直流変換回路３の応答速度も
遅く設定している。このため、前記したように、測定初
期状態では電圧制御減衰器12が交流基準信号の減衰量を
零とするように制御し、被測定増幅回路１に振幅の大き
な交流基準信号が加えられ、被測定増幅回路１の出力電
圧の波形が測定初期状態からの立ち上がりにおいてクリ
ップする。その結果、交流−直流変換回路３からの直流
電圧の値が基準直流電圧E0より小さくなる。そして、一
旦、この状態が発生すると、交流−直流変換回路３から
の直流電圧と基準直流電圧E0とに差電圧が発生し、差動
増幅器14から減衰量を少なくするように制御入力電圧が
電圧制御減衰器12の加えられ、被測定増幅回路１の出力
電圧がクリップしたままで安定する。この結果、出力電
圧の波形の歪率等の測定が正確に行うことができないと
いう問題があった。In this amplifier circuit output voltage setting device, in the initial measurement state, the rise of the output voltage of the amplifier circuit under test 1 is delayed, so that the rise of the output of the AC voltage converted by the AC-DC converter circuit 3 is delayed, and the output voltage is instantaneously increased. Therefore , the difference from the reference DC voltage E 0 becomes large. Therefore, a large difference voltage is instantaneously output from the differential amplifier 14, and the voltage control attenuator 12 controls the attenuation amount of the AC reference signal to be zero. Further, when a low frequency signal is used as the AC reference signal and the output voltage of the measured amplifier circuit 1 is set to the maximum output voltage (near the output waveform is clipped), variations in the gain of the measured amplifier circuit 1 are taken into consideration. Then, the magnitude of the AC reference signal of the reference signal source 10 is given a margin, and the response speed of the AC-DC conversion circuit 3 is also set slow. Therefore, as described above, in the initial measurement state, the voltage controlled attenuator 12 controls the attenuation amount of the AC reference signal to be zero, and the AC reference signal having a large amplitude is applied to the amplifier circuit 1 to be measured. The waveform of the output voltage of the measurement amplification circuit 1 clips at the rising from the initial measurement state. As a result, the value of the DC voltage from the AC-DC conversion circuit 3 becomes smaller than the reference DC voltage E 0 . Then, once this state occurs, a difference voltage is generated between the DC voltage from the AC-DC conversion circuit 3 and the reference DC voltage E 0, and the control input voltage is reduced by the differential amplifier 14 so as to reduce the amount of attenuation. With the addition of the voltage control attenuator 12, the output voltage of the amplifier circuit under test 1 stabilizes while being clipped. As a result, there is a problem in that the distortion factor of the waveform of the output voltage cannot be accurately measured.
したがって、この発明の目的は、被測定増幅回路の出力
電圧がクリップすることがなく、測定に必要な振幅の出
力電圧を保持することができる増幅回路出力電圧設定装
置を提供するものである。Therefore, an object of the present invention is to provide an amplifier circuit output voltage setting device capable of holding an output voltage having an amplitude necessary for measurement without clipping the output voltage of the amplifier circuit to be measured.
この発明の増幅回路出力電圧設定装置は、被測定増幅回
路に対して交流基準信号を出力する基準信号源と、前記
基準信号源と前記被測定増幅回路との間に介在して制御
入力電圧の変化に応じて減衰量を変化させる電圧制御減
衰器と、徐々に上昇する電圧を発生し前記電圧制御減衰
器に対して制御入力電圧として与える電圧発生回路と、
前記被測定増幅回路の出力電圧を直流電圧に変換する交
流−直流変換回路と、基準直流電圧と前記交流−直流変
換回路の出力電圧とを比較し両者が一致したときにホー
ルド信号を発生する比較器と、前記電圧発生回路と前記
電圧制御減衰器との間に介在し通常は前記電圧発生回路
の出力電圧をそのまま前記電圧制御減衰器に制御入力電
圧として与え，前記ホールド信号に応答して前記電圧発
生回路の現発生電圧を保持して前記電圧制御回路に制御
電圧として与えるホールド回路とを備えている。The amplifier circuit output voltage setting device of the present invention includes a reference signal source for outputting an AC reference signal to the amplifier circuit under test, and a control input voltage of the control input voltage interposed between the reference signal source and the amplifier circuit under test. A voltage-controlled attenuator that changes the amount of attenuation according to the change, a voltage generation circuit that generates a gradually increasing voltage and supplies the voltage-controlled attenuator as a control input voltage,
Comparison in which an AC-DC conversion circuit that converts the output voltage of the amplifier circuit under measurement into a DC voltage is compared with a reference DC voltage and an output voltage of the AC-DC conversion circuit, and a hold signal is generated when the two match. Between the voltage generating circuit and the voltage control attenuator, and normally the output voltage of the voltage generating circuit is applied as it is to the voltage control attenuator as a control input voltage, in response to the hold signal. And a hold circuit for holding the current generated voltage of the voltage generating circuit and giving it as a control voltage to the voltage control circuit.
この発明の構成によれば、電圧発生回路から徐々に変化
する電圧がホールド回路を介し電圧制御減衰器に制御入
力電圧として加えられる。電圧制御減衰器は、制御入力
電圧の変化に応じて減衰量を減少させる。したがって、
被測定増幅回路に加えられる交流基準信号の振幅が徐々
に増大し、これにより、被測定増幅回路の出力電圧の振
幅も徐々に大きくなる。一方、この被測定増幅回路の出
力電圧は、交流−直流変換回路で直流電圧に変換され、
比較器で基準直流電圧と比較される。そして、交流−直
流変換回路から出力される直流電圧の値が基準直流電圧
の値と一致していないときには、比較器からはホールド
信号がホールド回路に出力されず、ホールド回路は、電
圧発生回路からの徐々に変化する電圧をそのまま制御入
力電圧として電圧制御減衰器に加え続ける。その結果、
電圧制御減衰器からの減衰量が減少して電圧制御減衰器
から被測定増幅回路へ加えられる交流基準信号の振幅が
増大し続け、被測定増幅回路の出力電圧の振幅も徐々に
大きくなる。その後、交流−直流変換回路から出力され
た直流電圧の値が基準直流電圧の値と等しくなったとき
に、比較器はホールド信号をホールド回路に加える。こ
の結果、ホールド回路は、この比較器からのホールド信
号に応答して電圧発生回路の現発生電圧を保持して、こ
の現発生電圧を電圧制御減衰器に制御入力電圧として加
える。その結果、電圧制御減衰器の減衰量が固定され、
電圧制御減衰器から被測定増幅回路に加えられる交流基
準信号の振幅がホールド信号発生時の振幅に保持され、
被測定増幅回路から出力される出力電圧の振幅も一定に
保持される。このとき、交流−直流変換回路から出力さ
れる直流電圧の値が被測定増幅回路から出力される出力
電圧の振幅に対応しているため、基準直流電圧の値に対
応した振幅をもつ出力電圧が被測定増幅回路から出力さ
れることになる。According to the configuration of the present invention, the voltage that gradually changes from the voltage generation circuit is applied as the control input voltage to the voltage controlled attenuator through the hold circuit. The voltage controlled attenuator reduces the amount of attenuation according to the change of the control input voltage. Therefore,
The amplitude of the AC reference signal applied to the amplifier circuit under test gradually increases, and the amplitude of the output voltage of the amplifier circuit under test also gradually increases. On the other hand, the output voltage of the measured amplifier circuit is converted into a DC voltage by the AC-DC converter circuit,
It is compared with the reference DC voltage by the comparator. When the value of the DC voltage output from the AC-DC conversion circuit does not match the value of the reference DC voltage, the hold signal is not output from the comparator to the hold circuit, and the hold circuit outputs the hold signal from the voltage generation circuit. The gradually changing voltage of is continuously applied to the voltage control attenuator as the control input voltage. as a result,
The amount of attenuation from the voltage controlled attenuator decreases, the amplitude of the AC reference signal applied from the voltage controlled attenuator to the amplifier circuit under test continues to increase, and the amplitude of the output voltage of the amplifier circuit under test also gradually increases. After that, when the value of the DC voltage output from the AC-DC conversion circuit becomes equal to the value of the reference DC voltage, the comparator applies a hold signal to the hold circuit. As a result, the hold circuit holds the present generated voltage of the voltage generating circuit in response to the hold signal from the comparator and applies the present generated voltage to the voltage controlled attenuator as a control input voltage. As a result, the amount of attenuation of the voltage controlled attenuator is fixed,
The amplitude of the AC reference signal applied from the voltage control attenuator to the amplifier circuit under test is held at the amplitude when the hold signal was generated.
The amplitude of the output voltage output from the amplifier circuit under measurement is also kept constant. At this time, since the value of the DC voltage output from the AC-DC conversion circuit corresponds to the amplitude of the output voltage output from the amplifier circuit under measurement, the output voltage having the amplitude corresponding to the value of the reference DC voltage is It is output from the amplifier circuit under test.
この発明の増幅回路出力電圧設定装置の一実施例を第１
図に基づいて説明する。The first embodiment of the amplifier circuit output voltage setting device of the present invention
It will be described with reference to the drawings.
この増幅回路出力電圧設定装置は、第１図に示すよう
に、基準信号源10と電圧制御減衰器２と交流−直流変換
回路３と比較器４と基準直流電圧E0とホールド回路５と
電圧発生回路６とからなる。電圧発生回路６は、直流電
圧E1とスイッチ７と抵抗８とコンデンサ９とからなる。
１は出力特性を測定される被測定増幅回路を示してい
る。v0は被測定増幅回路１の出力特性を測定する外部測
定端子を示している。As shown in FIG. 1, this amplifier circuit output voltage setting device includes a reference signal source 10, a voltage control attenuator 2, an AC-DC conversion circuit 3, a comparator 4, a reference DC voltage E 0 , a hold circuit 5, and a voltage. And a generating circuit 6. The voltage generating circuit 6 includes a DC voltage E 1 , a switch 7, a resistor 8 and a capacitor 9.
Reference numeral 1 denotes an amplifier circuit to be measured whose output characteristic is measured. v 0 is an external measurement terminal for measuring the output characteristic of the amplifier circuit under test 1.
基準信号源10は、被測定増幅回路１に対して交流基準信
号を入力する。電圧制御減衰器２は、基準信号源10と被
測定増幅回路１との間に介在し、制御入力電圧の変化に
応じて減衰量を減少させる。電圧発生回路６は、徐々に
上昇するように変化する電圧を発生し、電圧制御減衰器
２に対して制御入力電圧として与える。交流−直流変換
回路３は、被測定増幅回路１の出力電圧を直流電圧に変
換する。基準直流電圧E0は、被測定増幅回路１の出力電
圧を測定に必要とする振幅に対応した値に設定されてい
る。比較器４は、基準直流電圧E0と交流−直流変換回路
３の出力電圧とを比較し、両者が一致したときにホール
ド信号を発生する。ホールド回路５は、電圧発生回路６
と電圧制御減衰器２との間に介在し、通常は電圧発生回
路６の出力電圧をそのまま電圧制御減衰器２に制御入力
電圧として加え、比較器４からのホールド信号に応答し
て電圧発生回路６の現発生電圧を保持して電圧制御減衰
器２に制御入力電圧として加える。The reference signal source 10 inputs an AC reference signal to the amplifier circuit under test 1. The voltage-controlled attenuator 2 is interposed between the reference signal source 10 and the amplifier circuit under test 1, and reduces the amount of attenuation according to the change in the control input voltage. The voltage generating circuit 6 generates a voltage that changes so as to gradually rise and supplies it to the voltage controlled attenuator 2 as a control input voltage. The AC-DC conversion circuit 3 converts the output voltage of the measured amplifier circuit 1 into a DC voltage. The reference DC voltage E 0 is set to a value corresponding to the amplitude required for measuring the output voltage of the amplifier circuit under test 1. The comparator 4 compares the reference DC voltage E 0 with the output voltage of the AC-DC conversion circuit 3 and generates a hold signal when the two match. The hold circuit 5 includes a voltage generation circuit 6
Normally, the output voltage of the voltage generating circuit 6 is added as it is as a control input voltage to the voltage controlling attenuator 2, and the voltage generating circuit responds to the hold signal from the comparator 4. The current generated voltage of 6 is held and applied to the voltage controlled attenuator 2 as a control input voltage.
以下、この増幅回路出力電圧設定装置の動作を詳しく説
明する。The operation of the amplifier circuit output voltage setting device will be described in detail below.
基準信号源10が電圧制御減衰器２の入力端子2aに交流基
準信号を加える。電圧発生回路６は、スイッチ７を閉じ
ることにより、直流電源E1から抵抗８を介し、コンデン
サ９に充電を行う。したがって、抵抗８とコンデンサ９
とにより決まる時定数によって、コンデンサ９の端子電
圧が時間の経過とともに零から徐々に上昇するように変
化する。そして、この零から徐々に上昇する電圧が電圧
発生回路６からホールド回路５の入力端子5a′に加えら
れ、ホールド回路５を介し出力端子5bから電圧制御減衰
器２の制御電圧入力端子2a′へ制御入力電圧として加え
られる。電圧制御減衰器２は、制御入力端子2a′に印加
される制御入力電圧の変化に応じて減衰量を減少させ
る。したがって、電圧制御減衰器２の出力端子2bから被
測定増幅回路１の入力端子1aへ加えられる交流基準信号
の振幅が、電圧発生回路６からの制御入力電圧の変化に
応じて徐々に増大する。これにより、被測定増幅回路１
の出力端子1bから出力される出力電圧の振幅も徐々に増
大する。そして、この振幅が徐々に増大する出力電圧
が、交流−直流変換回路３の交流入力端子3aに加えら
れ、直流電圧に変換されて直流出力端子3bから差動増幅
器14の非反転入力端子4aに加えられる。つぎに、比較器
４は、反転入力端子4a′に加えられた基準直流電圧E0の
値と、交流−直流変換回路３から入力した直流電圧の値
とを比較する。そして、交流−直流変換回路３からの直
流電圧の値が基準直流電圧E0の値より小さいとき，すな
わち直流電圧の値と基準直流電圧E0の値とが一致しない
ときには、比較器４からはホールド信号がホールド回路
５に出力されない。したがって、ホールド回路５は、電
圧発生回路６からの徐々に上昇する電圧をそのまま制御
入力電圧として電圧制御減衰器２の制御電圧入力端子2
a′に加え続ける。その結果、電圧制御減衰器２は減衰
量を減少させ、電圧制御減衰器２から被測定増幅回路１
へ加えられる交流基準信号の振幅も増大し続け、被測定
増幅回路１の出力電圧の振幅も徐々に増大する。その
後、交流−直流変換回路３から出力される直流電圧の値
が基準直流電圧E0の値と等しくなったとき，すなわち直
流電圧の値と基準直流電圧E0の値とが一致したときに、
比較器４はホールド信号をホールド回路５の入力端子5a
に加える。その結果、ホールド回路５は、この比較器４
からのホールド信号に応答して電圧発生回路６の現発生
電圧を保持し、この現発生電圧を制御入力電圧として電
圧制御減衰器２の制御電圧入力端子2a′に加える。した
がって、電圧制御減衰器２の減衰量が固定され、電圧制
御減衰器２から被測定増幅回路１に加えられる交流基準
信号の振幅がホールド信号発生時の振幅に保持される。
この結果、被測定増幅回路１から出力される出力電圧の
振幅も一定に保持される。このとき、交流−直流変換回
路３から出力される直流電圧の値が被測定増幅回路１か
ら出力される出力電圧の振幅に対応しているため、基準
直流電圧E0の値に対応した振幅を持つ出力電圧が被測定
増幅回路１から出力されることになる。The reference signal source 10 applies an AC reference signal to the input terminal 2a of the voltage controlled attenuator 2. The voltage generation circuit 6 charges the capacitor 9 from the DC power source E 1 through the resistor 8 by closing the switch 7. Therefore, resistor 8 and capacitor 9
The terminal constant of the capacitor 9 changes so as to gradually increase from zero with the passage of time by the time constant determined by Then, the voltage gradually increasing from zero is applied from the voltage generating circuit 6 to the input terminal 5a 'of the hold circuit 5, and from the output terminal 5b to the control voltage input terminal 2a' of the voltage controlled attenuator 2 via the hold circuit 5. Applied as control input voltage. The voltage control attenuator 2 reduces the amount of attenuation according to the change of the control input voltage applied to the control input terminal 2a '. Therefore, the amplitude of the AC reference signal applied from the output terminal 2b of the voltage controlled attenuator 2 to the input terminal 1a of the measured amplifier circuit 1 gradually increases according to the change of the control input voltage from the voltage generation circuit 6. As a result, the amplifier circuit under test 1
The amplitude of the output voltage output from the output terminal 1b also gradually increases. Then, the output voltage whose amplitude gradually increases is applied to the AC input terminal 3a of the AC-DC conversion circuit 3, is converted into a DC voltage, and is converted from the DC output terminal 3b to the non-inverting input terminal 4a of the differential amplifier 14. Added. Next, the comparator 4 compares the value of the reference DC voltage E 0 applied to the inverting input terminal 4a ′ with the value of the DC voltage input from the AC-DC conversion circuit 3. The AC - when the value of the DC voltage from the DC conversion circuit 3 is smaller than the value of the reference DC voltage E 0, i.e. when the values of the reference DC voltage E 0 of the DC voltage does not match, the comparator 4 The hold signal is not output to the hold circuit 5. Therefore, the hold circuit 5 uses the gradually rising voltage from the voltage generation circuit 6 as it is as the control input voltage, and outputs the control voltage input terminal 2 of the voltage controlled attenuator 2.
Continue adding to a '. As a result, the voltage control attenuator 2 reduces the amount of attenuation, and the voltage control attenuator 2 moves from the measured amplifier circuit 1 to the measured amplifier circuit 1.
The amplitude of the AC reference signal applied to the circuit also continues to increase, and the amplitude of the output voltage of the amplifier circuit under test 1 also gradually increases. After that, when the value of the DC voltage output from the AC-DC conversion circuit 3 becomes equal to the value of the reference DC voltage E 0 , that is, when the value of the DC voltage and the value of the reference DC voltage E 0 match,
The comparator 4 outputs the hold signal to the input terminal 5a of the hold circuit 5.
Add to. As a result, the hold circuit 5 has the comparator 4
The current generated voltage of the voltage generating circuit 6 is held in response to the hold signal from the above, and this current generated voltage is applied to the control voltage input terminal 2a 'of the voltage controlled attenuator 2 as a control input voltage. Therefore, the amount of attenuation of the voltage controlled attenuator 2 is fixed, and the amplitude of the AC reference signal applied from the voltage controlled attenuator 2 to the amplifier circuit under test 1 is held at the amplitude when the hold signal is generated.
As a result, the amplitude of the output voltage output from the measured amplifier circuit 1 is also kept constant. At this time, since the value of the DC voltage output from the AC-DC conversion circuit 3 corresponds to the amplitude of the output voltage output from the amplifier circuit under test 1, the amplitude corresponding to the value of the reference DC voltage E 0 is changed. The output voltage that it has is output from the amplifier circuit under test 1.
このように、この増幅回路出力電圧設定装置は、被測定
増幅回路１に加える交流基準信号の振幅を電圧発生回路
６からの制御入力電圧により電圧制御減衰器２で徐々に
大きくし、被測定増幅回路１の出力電圧の振幅に対応し
た交流−直流変換回路３の直流電圧の値が基準直流電圧
E0の値と一致したときに比較器４からホールド信号をホ
ールド回路５に加え、ホールド回路５が電圧発生回路６
の制御入力電圧を現発生電圧に保持し、電圧制御減衰器
２の減衰量を固定して被測定増幅回路１に加えられる交
流基準信号の振幅をホールド信号発生時の振幅に保持す
るようにしたので、被測定増幅回路１の出力電圧の振幅
を徐々に大きくすることができ、しかも測定に必要な振
幅の出力電圧に保持することができる。したがって、被
測定増幅回路１の出力電圧がクリップすることがなく、
確実に測定に必要な振幅の出力電圧に保持することが
き、正確な出力特性の測定を行わせることができる。As described above, this amplifier circuit output voltage setting device gradually increases the amplitude of the AC reference signal applied to the amplifier circuit under test 1 by the voltage control attenuator 2 by the control input voltage from the voltage generating circuit 6, and amplifies the amplifier under test. The value of the DC voltage of the AC-DC conversion circuit 3 corresponding to the amplitude of the output voltage of the circuit 1 is the reference DC voltage.
When the value of E 0 matches, the hold signal is applied from the comparator 4 to the hold circuit 5, and the hold circuit 5 causes the voltage generation circuit 6 to operate.
The control input voltage of is held at the present generated voltage, the attenuation amount of the voltage controlled attenuator 2 is fixed, and the amplitude of the AC reference signal applied to the amplifier circuit under test 1 is held at the amplitude when the hold signal is generated. Therefore, the amplitude of the output voltage of the amplifier circuit 1 to be measured can be gradually increased, and the output voltage having the amplitude required for measurement can be held. Therefore, the output voltage of the measured amplifier circuit 1 does not clip,
The output voltage having the amplitude necessary for the measurement can be surely held, and accurate output characteristics can be measured.
なお、この実施例の増幅回路出力電圧設定装置において
は、電圧発生回路６からの出力電圧を零から時間の経過
とともに徐々に上昇するように変化させ、この出力電圧
に応じて電圧制御減衰器２の減衰量を減少させるように
したが、電圧発生回路６の出力電圧を時間の経過ととも
に徐々に下降するように変化させて電圧制御減衰器２の
減衰量を減少させるようにしてもよい。In the amplifier circuit output voltage setting device of this embodiment, the output voltage from the voltage generating circuit 6 is changed so as to gradually increase from zero with the passage of time, and the voltage control attenuator 2 is changed according to the output voltage. However, the output voltage of the voltage generating circuit 6 may be changed so as to gradually decrease with the lapse of time to decrease the attenuation amount of the voltage control attenuator 2.
この発明の増幅回路出力電圧設定装置によれば、被測定
振幅回路に加える交流基準信号の減衰量を電圧制御減衰
器でホールド回路を介して電圧発生回路から入力する制
御入力電圧の変化に応じて減少させ、被測定増幅回路の
出力電圧を交流−直流変換回路で変換した直流電圧と基
準直流電圧とを比較器で比較し両者が一致したときにホ
ールド信号を発生し、このホールド信号に応答してホー
ルド回路が電圧発生回路の現発生電圧を保持して電圧制
御減衰器に制御電圧として与える構成であるので、被測
定増幅回路の出力電圧の振幅を徐々に大きくすることが
でき、しかも測定に必要な振幅の出力電圧に保持するこ
とができる。したがって、出力電圧がクリップすること
がなく、確実に測定に必要な振幅の出力電圧に保持する
ことができる。According to the amplifier circuit output voltage setting device of the present invention, the amount of attenuation of the AC reference signal applied to the measured amplitude circuit is changed by the voltage control attenuator in accordance with the change of the control input voltage input from the voltage generation circuit via the hold circuit. Decrease and compare the output voltage of the amplifier circuit under test with the DC voltage converted by the AC-DC converter circuit and the reference DC voltage.When the two match, generate a hold signal and respond to this hold signal. Since the hold circuit holds the current generated voltage of the voltage generation circuit and gives it as the control voltage to the voltage controlled attenuator, it is possible to gradually increase the amplitude of the output voltage of the amplifier circuit under test, and It can be held at the output voltage of the required amplitude. Therefore, the output voltage is not clipped, and the output voltage having the amplitude necessary for the measurement can be reliably held.
第１図はこの発明の一実施例の構成を示すブロック図、
第２図は従来の増幅回路出力電圧設定装置の構成を示す
ブロック図である。 １……被測定増幅回路、２……電圧制御減衰器、３……
交流−直流変換回路、４……比較器、５……ホールド回
路、６……電圧発生回路、10……基準信号源、E0……基
準直流電圧FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention,
FIG. 2 is a block diagram showing the configuration of a conventional amplifier circuit output voltage setting device. 1 ... Amplification circuit under test, 2 ... Voltage-controlled attenuator, 3 ...
AC - DC converter circuit, 4 ...... comparator, 5 ...... hold circuit, 6 ...... voltage generating circuit, 10 ...... reference signal source, E 0 ...... reference DC voltage
Claims (1)
力する基準信号源と、前記基準信号源と前記被測定増幅
回路との間に介在して制御入力電圧の変化に応じて減衰
量を減少させる電圧制御減衰器と、徐々に変化する電圧
を発生し前記電圧制御減衰器に対して制御入力電圧とし
て与える電圧発生回路と、前記被測定増幅回路の出力電
圧を直流電圧に交換する交流−直流変換回路と、基準直
流電圧と前記交流−直流変換回路の出力電圧とを比較し
両者が一致したときにホールド信号を発生する比較器
と、前記電圧発生回路と前記電圧制御減衰器との間に介
在し通常は前記電圧発生回路の出力電圧をそのまま前記
電圧制御減衰器に制御入力電圧として与え，前記ホール
ド信号に応答して前記電圧発生回路の現発生電圧を保持
して前記電圧制御回路に制御入力電圧として与えるホー
ルド回路とを備えた増幅回路出力電圧設定装置。1. A reference signal source for inputting an AC reference signal to an amplifier circuit to be measured, and an attenuation amount according to a change in a control input voltage interposed between the reference signal source and the amplifier circuit to be measured. A voltage controlled attenuator for reducing the voltage, a voltage generation circuit for generating a gradually changing voltage and giving it as a control input voltage to the voltage controlled attenuator, and an alternating current for exchanging the output voltage of the measured amplifier circuit with a direct current voltage. -A DC conversion circuit, a comparator that compares a reference DC voltage with an output voltage of the AC-DC conversion circuit, and generates a hold signal when the two match, a voltage generation circuit and the voltage control attenuator Normally, the output voltage of the voltage generating circuit is provided as it is as a control input voltage to the voltage control attenuator, and the current generated voltage of the voltage generating circuit is held in response to the hold signal to hold the voltage control circuit. Amplifier circuit output voltage setting device that includes a hold circuit for applying as a control input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63273786A JPH0695121B2 (en) | 1988-10-28 | 1988-10-28 | Amplifier circuit output voltage setting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63273786A JPH0695121B2 (en) | 1988-10-28 | 1988-10-28 | Amplifier circuit output voltage setting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02118464A JPH02118464A (en) | 1990-05-02 |
| JPH0695121B2 true JPH0695121B2 (en) | 1994-11-24 |
Family
ID=17532564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63273786A Expired - Lifetime JPH0695121B2 (en) | 1988-10-28 | 1988-10-28 | Amplifier circuit output voltage setting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0695121B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869195B (en) * | 2014-03-31 | 2017-03-22 | 国电科学技术研究院银川电力技术分院 | Engine rotor over-voltage protection device tester |
-
1988
- 1988-10-28 JP JP63273786A patent/JPH0695121B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02118464A (en) | 1990-05-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5430409A (en) | Amplifier clipping distortion indicator with adjustable supply dependence | |
| GB2029141A (en) | Gain control arrangements | |
| JPH05509218A (en) | Power amplifier saturation detection and correction method and apparatus | |
| JPH0728473B2 (en) | Impedance compensation circuit | |
| JP2001292189A (en) | Gain adjuster | |
| US4966160A (en) | Acoustic admittance measuring apparatus with wide dynamic range and logarithmic output | |
| JPH03190557A (en) | Maximum duty cycle controller of pulse width modulator | |
| US6809591B1 (en) | AGC circuit providing control of output signal amplitude and of output signal DC level | |
| US8284971B2 (en) | Logarithmic compression systems and methods for hearing amplification | |
| KR100196089B1 (en) | Circuitry for detecting output distortion of the last stage of an audio device | |
| US5442316A (en) | Temperature compensated and supply independent clipping distortion indicator | |
| JPH0695121B2 (en) | Amplifier circuit output voltage setting device | |
| KR880005745A (en) | Automatic Gain Control Method of Control Circuit and Its Circuit | |
| EP0921635B1 (en) | Power amplifier device | |
| US5146224A (en) | Ac signal generating apparatus for voltage and current standard | |
| JPH03183967A (en) | Voltage or current application current or voltage measuring instrument | |
| JP3093638B2 (en) | Output level control circuit | |
| JPH0514150A (en) | Variable delay device | |
| JPH03222508A (en) | Amplifier circuit | |
| JPH03175709A (en) | Power control circuit for high frequency amplifier | |
| JP3260533B2 (en) | Current detector | |
| JPH0325182Y2 (en) | ||
| US3551772A (en) | Closed control system having means responsive to the amplitude of selfoscillations to modify one or more parameters of the system | |
| JPH04200005A (en) | Power amplifier | |
| SU993436A1 (en) | Ultrasonic device with automatic stabilization of oscillations amplitude of electromechanic transducer |