JPH01229507A - Semiconductor integrated circuit device - Google Patents
Semiconductor integrated circuit deviceInfo
- Publication number
- JPH01229507A JPH01229507A JP63056739A JP5673988A JPH01229507A JP H01229507 A JPH01229507 A JP H01229507A JP 63056739 A JP63056739 A JP 63056739A JP 5673988 A JP5673988 A JP 5673988A JP H01229507 A JPH01229507 A JP H01229507A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- power
- feedback resistance
- switch
- short
- 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.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は帰還抵抗を有する増幅器を内蔵する半導体集積
回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a semiconductor integrated circuit incorporating an amplifier having a feedback resistor.
従来、出力から帰還抵抗を介して入力に帰還する増幅器
を備える半導体集積回路において、電源投入時に増幅器
が正常動作を開始するまで、すなわち増幅器の動作点が
安定するまでの時間は、例えば入力にカップリングコン
デンサーが必要な場合、その容量値Ｃとアナログ回路の
帰還抵抗の抵抗値Ｒで決まる時定数の開時たねばならな
かった。Conventionally, in a semiconductor integrated circuit equipped with an amplifier that feeds back from the output to the input via a feedback resistor, the time it takes for the amplifier to start normal operation when the power is turned on, that is, for the operating point of the amplifier to stabilize, is limited to a When a ring capacitor is required, the opening time must be determined by its capacitance value C and the resistance value R of the feedback resistor of the analog circuit.
すなわち電源投入からシステム動作までの時間がかかる
という不都合があり、従来は外付けで回路を組んでカッ
プリングコンデンサーをある電圧まで、強制的に充電し
ていたため、システム全体の拡大、部品増によるコスト
高という問題を生じていた。In other words, there is an inconvenience that it takes time from power-on to system operation, and in the past, the coupling capacitor was forcibly charged to a certain voltage by assembling an external circuit, which increased the cost of expanding the entire system and increasing the number of parts. There was a problem of high
本発明の目的はかかる問題を容易にかつ兼備に達成する
手段を提供することにある。An object of the present invention is to provide means for easily and efficiently solving these problems.
出力から帰還抵抗を介して入力に帰還する増幅器におい
て、該帰還抵抗と並列にスイッチを有することにより、
電源投入時、スイッチを閉じることにより帰還抵抗を短
絡すれば、増幅回路の動作点は即座に決まり、増幅回路
は動作を開始する。In an amplifier that feeds back from the output to the input via the feedback resistor, by having a switch in parallel with the feedback resistor,
When the power is turned on, if the feedback resistor is short-circuited by closing the switch, the operating point of the amplifier circuit is immediately determined and the amplifier circuit starts operating.
以下本発明を実体例をもって説明する。第１図は本発明
の一実施例のブロック図である。信号入力端子２が増幅
器３の入力及び帰還抵抗４の片側ニ接続され、更にトラ
ンスミッションゲート５のドレイン側に接続され、増幅
器３の出力が帰還抵抗４のもう片側とトランスミッショ
ンゲート５のソース側に接続され、トランスミッション
ゲート５のＰｃｈ側のゲートとＮｃｈ側のゲートはそれ
ぞれ制御回路６の出力に接続され、入力端子２にはカッ
プリングコンデンサ１の片側が接続され、カップリング
コンデンサ１のもう片側は信号源１７の出力に接続され
、増幅器３への入力は信号源１７よりカップリングコン
デンサ２を通して行われる。電源投入時に制御回路６に
よりトランスミッションゲート５をＯＮさせることによ
り帰還抵抗４は短絡され、カップリングコンデンサ１は
増幅器の動作点となる電圧まで、増幅器の出力電圧によ
り即座に充電され、増幅器は動作を開始する。The present invention will be explained below using actual examples. FIG. 1 is a block diagram of one embodiment of the present invention. The signal input terminal 2 is connected to the input of the amplifier 3 and one side of the feedback resistor 4, and further connected to the drain side of the transmission gate 5, and the output of the amplifier 3 is connected to the other side of the feedback resistor 4 and the source side of the transmission gate 5. The Pch side gate and the Nch side gate of the transmission gate 5 are connected to the output of the control circuit 6, respectively, one side of the coupling capacitor 1 is connected to the input terminal 2, and the other side of the coupling capacitor 1 is connected to the signal It is connected to the output of the signal source 17, and input to the amplifier 3 is performed from the signal source 17 through the coupling capacitor 2. When the power is turned on, the feedback resistor 4 is short-circuited by turning on the transmission gate 5 by the control circuit 6, and the coupling capacitor 1 is immediately charged by the output voltage of the amplifier to the voltage that becomes the operating point of the amplifier, and the amplifier stops operating. Start.
すなわち、帰還抵抗４の抵抗値Ｒ１はトランスミッショ
ンゲート５によって短絡されるのでＲ１：ｌ：０となる
。That is, since the resistance value R1 of the feedback resistor 4 is short-circuited by the transmission gate 5, it becomes R1:l:0.
よって本発明でのカップリングコンデンサーの充電時間
Ｔ１はほぼ零となり、電源投入時、増幅器は直ちに安定
動作を開始する。増幅器３．帰還抵抗４．スイッチ５お
よび制御回路６は同一半導体チップ上に形成されている
。Therefore, the charging time T1 of the coupling capacitor in the present invention becomes almost zero, and the amplifier immediately starts stable operation when the power is turned on. Amplifier 3. Feedback resistance 4. Switch 5 and control circuit 6 are formed on the same semiconductor chip.
以上説明した様に本発明によれば、電源投入時から、シ
ステム動作開始までの待ち時間を従来の様な外付は部品
なしで取り去ることができるためシステムの拡大２部品
増によるコスト大という問題は解決される。As explained above, according to the present invention, the waiting time from when the power is turned on to when the system starts operating can be removed without the need for conventional external components, so there is a problem of high costs due to expansion of the system and the addition of two parts. is resolved.
第１図は本発明の一実施例を示す半導体集積回路のブロ
ック図である。
１．１０・・・・・・カップリングコンデンサー、２゜
１１・・・・・・入力端子、７，１８・・・・・・信号
源、４゜１２・・・・・・帰還抵抗、５・・・・・・ト
ランスミッションゲート、６・・・・・・制御回路、３
，１３・・・・・・増幅器、８．９・・・・・・充電回
路。
代理人 弁理士 内 原 音FIG. 1 is a block diagram of a semiconductor integrated circuit showing one embodiment of the present invention. 1.10...Coupling capacitor, 2゜11...Input terminal, 7,18...Signal source, 4゜12...Feedback resistor, 5 ...Transmission gate, 6...Control circuit, 3
, 13...Amplifier, 8.9...Charging circuit. Agent Patent Attorney Oto Uchihara
Claims (1)
て、増幅回路と、この増幅回路の入出力間に接続された
帰還抵抗と、この帰還抵抗に並列に接続されたスイッチ
素子と、電源投入に応答して前記スイッチを導通させる
制御回路とを一つの半導体チップ上に有することを特徴
とする半導体集積回路装置。In an amplifier that feeds back from the output to the input via a feedback resistor, there is an amplifier circuit, a feedback resistor connected between the input and output of this amplifier circuit, a switch element connected in parallel to this feedback resistor, and a switch element that responds to power-on. and a control circuit for making the switch conductive on one semiconductor chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63056739A JPH01229507A (en) | 1988-03-09 | 1988-03-09 | Semiconductor integrated circuit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63056739A JPH01229507A (en) | 1988-03-09 | 1988-03-09 | Semiconductor integrated circuit device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01229507A true JPH01229507A (en) | 1989-09-13 |
Family
ID=13035895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63056739A Pending JPH01229507A (en) | 1988-03-09 | 1988-03-09 | Semiconductor integrated circuit device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01229507A (en) |
-
1988
- 1988-03-09 JP JP63056739A patent/JPH01229507A/en active Pending
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