JPS6347312B2 - - Google Patents
Info
- Publication number
- JPS6347312B2 JPS6347312B2 JP57047022A JP4702282A JPS6347312B2 JP S6347312 B2 JPS6347312 B2 JP S6347312B2 JP 57047022 A JP57047022 A JP 57047022A JP 4702282 A JP4702282 A JP 4702282A JP S6347312 B2 JPS6347312 B2 JP S6347312B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- differential amplifier
- modulator
- current
- 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
Links
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
【発明の詳細な説明】
この発明は高速度でバースト状の変調信号波形
を送出する差動駆動型変調器の駆動回路の改良に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a drive circuit for a differential drive type modulator that sends out a burst-like modulation signal waveform at high speed.
パルス符号変調信号を時分割多重して利用する
場合には、バースト状の信号を得るために変調信
号をON／OFFするON／OFFゲート回路を必要
とする。このON／OFFゲート回路には次のよう
な性能が必要である。 When using pulse code modulated signals by time division multiplexing, an ON/OFF gate circuit is required to turn the modulated signal ON/OFF in order to obtain a burst signal. This ON/OFF gate circuit requires the following performance.
十分なON／OFF比が得られること。 A sufficient ON/OFF ratio must be obtained.
伝送信号のクロツク信号の速度と同程度の速
度の高速度スイツチングができること。 Able to perform high-speed switching at a speed comparable to the speed of the clock signal of the transmission signal.
帯域外にスプリアスを出さないこと。 Do not emit spurious signals outside the band.
駆動が容易であること。 Must be easy to drive.
従来、この種のゲート回路はスイツチ素子とし
てダイオード等を用いて構成し、変調信号波を
ON／OFFする方式が採用されていた。 Conventionally, this type of gate circuit was constructed using a diode etc. as a switch element, and the modulated signal wave was
An ON/OFF method was used.
しかしながら、この方式は搬送波の周波数が高
くなるに従い所要の性能を得るための回路が複雑
になること、またスイツチの速度の制御が困難で
ある為に、急峻な出力パルスとなり、ON／OFF
ゲート動作時に帯域外にスプリアスを発生するこ
との欠点があつた。 However, with this method, as the frequency of the carrier wave increases, the circuit required to obtain the required performance becomes more complex, and it is difficult to control the speed of the switch, resulting in a steep output pulse, resulting in ON/OFF
The drawback is that spurious signals are generated outside the band during gate operation.
本発明は従来の上記実情に鑑みてなされたもの
であり、従つて本発明の目的は、変調器として差
動駆動型線形変調器を用いる場合に、変調器をデ
ータ信号に応じて駆動する機能と、ON／OFF波
形を容易に制御できるON／OFFゲート機能とを
合せもつことにより、従来の上記欠点を解消でき
る新規な差動駆動型線形変調器駆動回路を提供す
ることにある。 The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide a function for driving a modulator according to a data signal when a differential drive type linear modulator is used as a modulator. It is an object of the present invention to provide a novel differential drive type linear modulator drive circuit that can eliminate the above-mentioned drawbacks of the conventional art by having both an ON/OFF gate function that allows easy control of ON/OFF waveforms.
本発明の上記目的は、差動増幅器と、該差動増
幅器に電流を供給する電流供給回路とを含む線形
変調器駆動回路において、前記電流供給回路が低
域波器と、帯域制限された駆動電流を生成する
回路とを含み、該帯域制限された駆動電流波形を
前記差動増幅器に供給することを特徴とする線形
変調器駆動回路、によつて達成される。 The above object of the present invention is to provide a linear modulator drive circuit including a differential amplifier and a current supply circuit for supplying current to the differential amplifier, wherein the current supply circuit includes a low frequency amplifier and a band-limited drive circuit. This is achieved by a linear modulator drive circuit characterized in that it includes a circuit that generates a current and supplies the band-limited drive current waveform to the differential amplifier.
次に本発明をその良好な一実施例について図面
を参照しながら具体的に説明しよう。 Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.
第１図に本発明の概念を示すブロツク図を、第
２図に各部の信号波形をそれぞれ示す。変調信号
は、変調信号入力端子１１から差動増幅器を含む
駆動回路１に入力され、ここにおいて、差動信号
出力１２，１３に変換され、差動駆動型線形変調
器２を駆動する。ここで、局部発振器５から供給
される搬送波が線形変調されて変調器出力端子１
４から出力される。 FIG. 1 shows a block diagram illustrating the concept of the present invention, and FIG. 2 shows signal waveforms at various parts. The modulation signal is input from a modulation signal input terminal 11 to a drive circuit 1 including a differential amplifier, where it is converted into differential signal outputs 12 and 13 to drive a differential drive type linear modulator 2. Here, the carrier wave supplied from the local oscillator 5 is linearly modulated and the modulator output terminal 1
Output from 4.
一方、ON／OFFゲート信号は、ゲート信号入
力端子１５から電流供給回路３に入力され、これ
に接続された駆動回路１に含まれる差動増幅器の
供給電流１６を制御する。ON／OFFゲートが
ONの場合には前述の差動増幅器に一定の電流が
供給されるので、変調入力信号に従つて得られる
差動信号出力によつて、変調器２が駆動される。
ON／OFFゲート信号がOFFの場合には前述の差
動増幅器への供給電流は０となり、駆動回路１の
出力端子１２，１３に等しい電圧が供給される。
すなわち、第２図の差信号（12）―（13）は0V
となり、これによつて駆動される差動駆動型変調
器２の出力信号はOFFとなる。このとき、ゲー
ト信号のON／OFFを急峻に行うと帯域外のスペ
クトラムが拡がり、他のチヤンネルへの妨害を与
える。したがつて、ここで、電流供給回路３の出
力がゲート信号のON／OFF信号を適当な低域
波器４によつて、波形整形をした電流１６となる
ようにすれば、変調器２の出力端子１４のON／
OFF波形の包絡線は任意に制御でき、スイツチ
ングスピードをわずかに遅くするのみで、帯域外
のスペクトラムの拡がりを防止することができ
る。 On the other hand, the ON/OFF gate signal is input to the current supply circuit 3 from the gate signal input terminal 15, and controls the supply current 16 of the differential amplifier included in the drive circuit 1 connected thereto. ON/OFF gate
When ON, a constant current is supplied to the above-mentioned differential amplifier, so the modulator 2 is driven by the differential signal output obtained in accordance with the modulation input signal.
When the ON/OFF gate signal is OFF, the current supplied to the differential amplifier described above becomes 0, and equal voltages are supplied to the output terminals 12 and 13 of the drive circuit 1.
In other words, the difference signal (12)-(13) in Figure 2 is 0V.
Therefore, the output signal of the differential drive type modulator 2 driven by this becomes OFF. At this time, if the gate signal is turned ON/OFF abruptly, the spectrum outside the band will expand, causing interference to other channels. Therefore, if the output of the current supply circuit 3 is made to be the current 16 obtained by waveform-shaping the ON/OFF signal of the gate signal by an appropriate low-frequency wave generator 4, the output of the modulator 2 is Output terminal 14 ON/
The envelope of the OFF waveform can be controlled arbitrarily, and spreading of the spectrum outside the band can be prevented by simply slowing down the switching speed slightly.
第３図に第１図のブロツク構成を詳細にした本
発明の一実施例を示す。トランジスタ３１，３２
の各々のエミツタ端子は端子２３で共通に接続さ
れており、それによつて差動増幅器が形成されて
いる。この差動増幅器の入力端子１１に入力され
た変調信号は、この差動増幅器で差動信号に変換
出力され、バツフアトランジスタ３３，３４を介
して差動駆動型変調器２に入力され、局部発振器
５からの搬送波信号を線形変調し、変調器出力端
子１４から出力される。 FIG. 3 shows an embodiment of the present invention in which the block configuration of FIG. 1 is detailed. Transistors 31, 32
The emitter terminals of each are connected in common at a terminal 23, thereby forming a differential amplifier. The modulated signal inputted to the input terminal 11 of this differential amplifier is converted into a differential signal by this differential amplifier, and inputted to the differential drive type modulator 2 via buffer transistors 33 and 34, and then The carrier signal from the oscillator 5 is linearly modulated and output from the modulator output terminal 14.
一方、ゲート信号は、端子１５から入力され、
バツフアトランジスタ３５を介して差動増幅器の
電流供給回路３に導かれる。この回路３において
ゲート信号を適当な低域波器４により波形整形
した後、抵抗３９，４０，４１、トランジスタ３
６からなる電圧電流変換回路に入力し、低域波
器４の出力電圧に比例した電流１６に変換する。
この出力電流１６は、差動増幅器の共通エミツタ
端子２３に接続され、差動増幅器をON／OFFす
る。OFF時には、差動増幅器の出力電圧は電源
端子１９の電位に等しくなるのでバツフアトラン
ジスタの出力１２，１３の電位も等しくなる。す
なわち、変調器２の差動入力端子電圧は0Vとな
り、変調器２から搬送波が出力されない。ON時
には、差動増幅器がONとなり、通常の駆動回路
として動作する。 On the other hand, the gate signal is input from the terminal 15,
It is led to the current supply circuit 3 of the differential amplifier via the buffer transistor 35. In this circuit 3, after the gate signal is waveform-shaped by an appropriate low frequency converter 4, the resistors 39, 40, 41 and the transistor 3
6, and converts it into a current 16 proportional to the output voltage of the low frequency converter 4.
This output current 16 is connected to the common emitter terminal 23 of the differential amplifier and turns the differential amplifier ON/OFF. When off, the output voltage of the differential amplifier becomes equal to the potential of the power supply terminal 19, so the potentials of the outputs 12 and 13 of the buffer transistors also become equal. That is, the differential input terminal voltage of the modulator 2 becomes 0V, and no carrier wave is output from the modulator 2. When ON, the differential amplifier turns ON and operates as a normal drive circuit.
電流供給回路３において、ON／OFF過渡応答
を制御するために用いる低域波器４の挿入箇所
を第４図ａ，ｂのように変形しても前記と同様の
効果を得ることができる。なお、第４図ａの場合
の低域波器は１個のコイルのような場合につい
て実現できる。 In the current supply circuit 3, the same effect as described above can be obtained even if the insertion location of the low frequency converter 4 used for controlling the ON/OFF transient response is modified as shown in FIGS. 4a and 4b. Note that the low frequency filter in the case of FIG. 4a can be realized with one coil.
以上の説明では、簡単のため、２相の変調器及
び駆動回路についてのみ説明したが、４相あるい
はもつと多相の変調器を駆動する場合にも本発明
を同様に実現することができる。 In the above description, for the sake of simplicity, only a two-phase modulator and a drive circuit have been described, but the present invention can be similarly implemented when driving a four-phase or even multi-phase modulator.
以上から、差動増幅型変調器を用いる場合、そ
の駆動回路に電流供給回路からゲート信号を適当
に帯域制限した電流を供給することにより、立ち
上がりが速くかつ帯域外スプリアスの無い信号を
得ることができると共に、従来必要であつたRF
帯のゲート回路を省くことができる効果がある。 From the above, when using a differential amplification type modulator, it is possible to obtain a signal that rises quickly and has no out-of-band spurious by supplying a current that has appropriately band-limited the gate signal from the current supply circuit to the drive circuit. RF, which was previously necessary.
This has the effect of omitting the band gate circuit.
第１図は本発明の概念を示すブロツク図、第２
図は各部の信号の波形を示す図、第３図は本発明
の一実施例を示す回路構成図、第４図は電流供給
回路の変形例を示す図である。
１……駆動回路、２……差動駆動型線形変調
器、３……電流供給回路、４……低域波器、５
……局部発振器、１１……変調信号入力端子、１
２，１３……変調器駆動信号端子、１４……変調
器出力端子、１５……ゲート信号入力端子、１６
……差動増幅器供給電流、１７……バイアス端
子、１９，２０，２１……電源端子、２２……ゲ
ート信号バツフア出力端子、３１，３２……差動
増幅器トランジスタ、３３，３４……バツフアト
ランジスタ、３５……ゲート信号バツフアトラン
ジスタ、３６……電流供給トランジスタ、３７，
３８，３９，４０，４１，４２，４３，４４，４
５……抵抗、４６……ダイオード。
Figure 1 is a block diagram showing the concept of the present invention, Figure 2 is a block diagram showing the concept of the present invention.
FIG. 3 is a circuit diagram showing an embodiment of the present invention, and FIG. 4 is a diagram showing a modified example of the current supply circuit. DESCRIPTION OF SYMBOLS 1...Drive circuit, 2...Differential drive type linear modulator, 3...Current supply circuit, 4...Low frequency generator, 5
...Local oscillator, 11...Modulation signal input terminal, 1
2, 13...Modulator drive signal terminal, 14...Modulator output terminal, 15...Gate signal input terminal, 16
... Differential amplifier supply current, 17 ... Bias terminal, 19, 20, 21 ... Power supply terminal, 22 ... Gate signal buffer output terminal, 31, 32 ... Differential amplifier transistor, 33, 34 ... Buffer Transistor, 35...Gate signal buffer transistor, 36...Current supply transistor, 37,
38, 39, 40, 41, 42, 43, 44, 4
5...Resistor, 46...Diode.
Claims (1)
る電流供給回路とを含む線形変調器駆動回路にお
いて、前記電流供給回路が低域波器と、帯域制
限された駆動電流を生成する回路とを含み、該帯
域制限された駆動電流波形を前記差動増幅器に供
給することを特徴とする線形変調器駆動回路。1. A linear modulator drive circuit including a differential amplifier and a current supply circuit that supplies current to the differential amplifier, in which the current supply circuit includes a low frequency amplifier and a circuit that generates a band-limited drive current. A linear modulator drive circuit comprising: a linear modulator drive circuit that supplies the band-limited drive current waveform to the differential amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57047022A JPS58162155A (en) | 1982-03-23 | 1982-03-23 | Driving circuit for linear modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57047022A JPS58162155A (en) | 1982-03-23 | 1982-03-23 | Driving circuit for linear modulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58162155A JPS58162155A (en) | 1983-09-26 |
| JPS6347312B2 true JPS6347312B2 (en) | 1988-09-21 |
Family
ID=12763551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57047022A Granted JPS58162155A (en) | 1982-03-23 | 1982-03-23 | Driving circuit for linear modulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58162155A (en) |
-
1982
- 1982-03-23 JP JP57047022A patent/JPS58162155A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58162155A (en) | 1983-09-26 |
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