JPS62126709A - Comparator - Google Patents

Comparator

Info

Publication number
JPS62126709A
JPS62126709A JP26491485A JP26491485A JPS62126709A JP S62126709 A JPS62126709 A JP S62126709A JP 26491485 A JP26491485 A JP 26491485A JP 26491485 A JP26491485 A JP 26491485A JP S62126709 A JPS62126709 A JP S62126709A
Authority
JP
Japan
Prior art keywords
comparator
turned
switch
input
differential amplifier
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.)
Granted
Application number
JP26491485A
Other languages
Japanese (ja)
Other versions
JP2594909B2 (en
Inventor
Toshiro Tsukada
敏郎 塚田
Yuichi Nakatani
祐一 中谷
Shigekame Imaizumi
栄亀 今泉
Tatsuji Matsuura
達治 松浦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi ULSI Engineering Corp
Hitachi Ltd
Original Assignee
Hitachi ULSI Engineering Corp
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi ULSI Engineering Corp, Hitachi Ltd filed Critical Hitachi ULSI Engineering Corp
Priority to JP60264914A priority Critical patent/JP2594909B2/en
Publication of JPS62126709A publication Critical patent/JPS62126709A/en
Application granted granted Critical
Publication of JP2594909B2 publication Critical patent/JP2594909B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To obtain a MOS sample-hold type comparator of a low offset voltage by replacing an inverter constituting the comparator by a differential amplifier. CONSTITUTION:When switches SWa, SWb are turned on, a differential amplifier 30 of capacitor coupling is self-biased and input terminals 35, 36 and output terminals 33, 34 go to the same voltage level. A switch SWx is turned on and a switch SWy is turned off to sample an input Vr in a capacitor CA. Then the switch SWa is turned off, and the switch SWy is turned off succeedingly to bring the differential amplifier 30 to the normal amplification mode, then the switches SWx, SWy are switched respectively OFF, ON and a voltage Vin is fed to an input terminal 31 of the capacitor CA. Thus, the input voltage difference Vin-Vref is amplified by the differential amplifier 30 and outputted at an output terminal 34. The output voltage is amplified further by an inverting amplifier stage 39 at the next stage and shifted to an output voltage level of a conventional comparator.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明はコンパレータに係り%特に高速A/D変換器に
好適な集積回路化(IC化)コンパレータに関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a comparator, and particularly to an integrated circuit (IC) comparator suitable for a high-speed A/D converter.

〔発明の背景〕[Background of the invention]

従来、並列形A/D変換器に用いられたコンパレータは
第1図(a)のようにキャパシタC+ 、Ctを介して
交流結合したインバータ10.11で2つの入力電圧V
r、V+mの差を増幅し、比較出力を得る構成となって
いる。その動作は第1図中)のようにサンプルサイクル
とホールドサイクルからなる。サンプルサイクルではス
イッチ8W+。
Conventionally, a comparator used in a parallel type A/D converter converts two input voltages V into inverters 10 and 11 which are AC-coupled via capacitors C+ and Ct, as shown in Fig. 1(a).
The configuration is such that the difference between r and V+m is amplified to obtain a comparative output. Its operation consists of a sample cycle and a hold cycle, as shown in Figure 1). Switch 8W+ in sample cycle.

8W2をオンしてインバータ10.11を各々スレッシ
ミルドレベルに自己バイアスし、同時にスイッチSW1
をオンして、v、f!:サンプルする。
8W2 is turned on to self-bias inverters 10 and 11 to the threshold level, and at the same time switch SW1 is turned on.
Turn on, v, f! : Sample.

つづくホールドサイクルではスイッチSWI。In the subsequent hold cycle, switch SWI.

SWzをオフしてインバータ10.11を各々増幅でき
るようIcL、8W、をオフ、SW、iオンとし、入力
をv2から■1に切換える。これによシ入力電圧差■1
゜−■、がインバータ10.11で増幅され、出力端1
3に出力される。この間サンプルされた電圧■、はキャ
パシタC+ にホールドされており、電圧差V+−V−
’km幅することが可能となる。この結果、出力端12
の電圧レベルによシV、とVIIlの大小を判定するこ
とができる。
SWz is turned off and IcL, 8W is turned off, SW, i is turned on, and the input is switched from v2 to ■1 so that inverters 10 and 11 can be amplified. Due to this, the input voltage difference■1
゜-■, is amplified by the inverter 10.11, and the output terminal 1
3 is output. During this time, the sampled voltage ■ is held in the capacitor C+, and the voltage difference V+-V-
'km wide. As a result, the output terminal 12
The magnitude of V and VII can be determined based on the voltage level of .

第1 図Oコンパレータはサンプル・ホールト形コンパ
レータとも呼ばれ、第2図(a)のようにMOS・IC
で構成されている。この回路の欠点はスイッチSW+ 
、8Wzを構成するMOS−FE’l”20.21がオ
フするとき、チャネルに存在した電荷がインバータ22
.23の入力端24.25に漏れてくることである。こ
の現象はチャージフィードスルーと呼ばれ、インバータ
22.23の入力端24.25に寄生電圧、すなわちフ
ィードスルー電圧を生じる。この電圧はインノ(−夕で
増幅、出力され、しばしばコンパレータに大きなオフセ
ット電圧を発生させ、高精度化の際の課題となってきた
Figure 1 The O comparator is also called a sample-hold type comparator, and as shown in Figure 2 (a), it is a MOS/IC comparator.
It consists of The drawback of this circuit is switch SW+
, 8Wz when the MOS-FE'l'' 20.21 is turned off, the charge existing in the channel is transferred to the inverter 22.
.. 23 is leaking to the input terminals 24 and 25. This phenomenon is called charge feedthrough and produces a parasitic voltage, ie a feedthrough voltage, at the input terminal 24.25 of the inverter 22.23. This voltage is amplified and output by the inverter, often generating a large offset voltage in the comparator, which has become an issue in improving precision.

このようなコンパレータの例としては% 1979年、
アイ・イー・イー・イー、インターナショナル・ソリッ
ド・ステート・サーキツツ・コンファレンス、T)iP
Ml 4.1.”ア・モノリフツク。
Examples of such comparators are %1979,
IE, International Solid State Circuits Conference, T)iP
Ml 4.1. ``A Monolivtsk.

チャージ−バランシング・サクセツシプーアプロクシイ
メイション A/D  テクニーク”(1979年IE
EE International 3o1id−!9
tate (::1rcuits  Conferen
ceの論文THPM14、1 ” A Monoli 
thic、 Charge−13alancingSu
ccessive−Approximation  A
/DTechnique″)があげられる。
Charge-Balancing Succession Proxyimation A/D Technique” (1979 IE
EE International 3o1id-! 9
tate (::1rcuits Conference
ce paper THPM14, 1” A Monoli
thic, Charge-13alancingSu
ccessive-Approximation A
/DTechnique'').

〔発明の目的〕[Purpose of the invention]

本発明の目的はオフセット電圧を低減し、IC化に適し
た高精度コンパレータを提供することにある。
An object of the present invention is to provide a high-precision comparator that reduces offset voltage and is suitable for IC implementation.

〔発明の概要〕[Summary of the invention]

上記の目的を達成するため、本発明では従来コンパレー
タを構成したインバータを差動形アンプで置き換え、自
己バイアス用スイッチによって発生するチャージフィー
ドスルーの差動成分を除去し、チャージフィードスルー
による寄生電圧が増幅、出力されないように差動形アン
プの自己バイアス用スイッチを構成した。
In order to achieve the above object, the present invention replaces the inverter that conventionally constituted the comparator with a differential amplifier, eliminates the differential component of the charge feedthrough generated by the self-bias switch, and eliminates the parasitic voltage due to the charge feedthrough. A self-bias switch for the differential amplifier was configured to prevent amplification and output.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の一実施例を第3図により説明する。キャ
パシタCAの一端にはスイッチSWオ。
An embodiment of the present invention will be described below with reference to FIG. Switch SW is connected to one end of capacitor CA.

SWアによシ2つの入力電圧V r 、 V Imが交
互に印加され、キャパシタC1の一端は一定のバイアス
電圧v1が印加される。vカはV、でも構わない。CA
 l!:Cmの他端はMOS−FETMI 、 M2 
Two input voltages V r and V Im are alternately applied to SW A, and a constant bias voltage v1 is applied to one end of the capacitor C1. Vka is V, but it doesn't matter. CA
l! :The other end of Cm is MOS-FETMI, M2
.

M3.M4と電流源工0から構成される差動形アンプの
入力端35.36に接続される。スイッチSW、は入力
端35と出力端33の間に、またスイッチSWhは入力
端35と他の入力端36の間に設けられ、この間を短絡
、開放する。正相の出力端34はキャパシタCとインバ
ータ37とスイッチSW、からなる従来コンパレータ(
第1図)の反転増幅段に接続される。
M3. It is connected to input terminals 35 and 36 of a differential amplifier composed of M4 and current source 0. A switch SW is provided between the input end 35 and the output end 33, and a switch SWh is provided between the input end 35 and the other input end 36 to short-circuit or open the two. The positive phase output terminal 34 is connected to a conventional comparator (
1) is connected to the inverting amplification stage shown in FIG.

第3図のコンパレータは入力′n圧V t、 V’1m
の大小を比較し、その栢果を出力端34あるいは出力端
38に出力する。その動作は次のとおりである。
The comparator in Figure 3 has an input 'n pressure V t, V'1m
The comparison result is outputted to the output terminal 34 or 38. Its operation is as follows.

スイッチSW、、SWbをオンすると、キャパシタ結合
されたall形アンプ30は自己バイアスされ、入力端
35.36及び出力端33.34は同一電圧レベルとな
る。またこのときスイッチSW、をオン、SWアをオフ
とし入力V、をキャパシタCAにサンプルする。つぎに
、ま−fsW。
When the switches SW, , SWb are turned on, the capacitor-coupled all-type amplifier 30 is self-biased, and the input terminals 35, 36 and output terminals 33, 34 are at the same voltage level. At this time, the switch SW is turned on and the switch SW is turned off, and the input V is sampled to the capacitor CA. Next, Ma-fsW.

をオフし、つづいてSWアをオフして差動形アンプ30
を通常の増幅モードとしてから、スイッチSW1とSW
2を各々オフ、オンに切換えてキャパシタCAの入力端
31にV+mを印加する。これによって入力電圧差V 
Is  Vt*tが差切形アンプ30で増幅され出力端
34に出力される。この出力電圧は次段の反転増幅段3
9で更に増幅され、従来コンパレータ(第1図)の出力
′電圧レベルにシフトされる。
, and then turn off SW A to turn off the differential amplifier 30.
Set to normal amplification mode, then switch SW1 and SW
2 are turned off and on, respectively, and V+m is applied to the input terminal 31 of the capacitor CA. As a result, the input voltage difference V
Is Vt*t is amplified by the differential amplifier 30 and output to the output terminal 34. This output voltage is applied to the next inverting amplification stage 3.
9 and shifted to the output 'voltage level of the conventional comparator (FIG. 1).

各スイッチSW、、SWb 、8W、、5Wア及びSW
、は第3図のタイムチャートに従ってオン、オフ制御さ
れる。SW、がオフしたとき、すなわちTQ期間でチャ
ージフィードスルーによる寄生電圧V t 1が発生す
るが、SWbがオンしているため、入力端35.36は
共通電位であシ、Vf1は差動形アンプの2つの入力の
電圧を共通にシフトするだけであるから、とのV t 
+は同相入力であり、増幅されない。つぎにSW−がオ
フしたとき、すなわちT1期間でチャージフィードスル
ーが発生するが、この寄生電圧VBも差動アンプの同相
人力′電圧成分となるだけで増幅されない。なぜならス
イッチSW−の両端は電気回路的にみて平衡しているか
らである。従来コンパレータ(第2図)の例では平衡が
得られておらず、これがチャージフィードスルーによる
オフセット電圧の発生のみならず、その低減化対策を困
難にしていた。
Each switch SW, SWb, 8W, 5W a and SW
, are controlled on and off according to the time chart shown in FIG. When SW is turned off, that is, during the TQ period, a parasitic voltage V t 1 is generated due to charge feedthrough, but since SWb is on, the input terminals 35 and 36 are at a common potential, and Vf1 is a differential type. Since we are simply shifting the voltages of the two inputs of the amplifier into common, V t
+ is a common mode input and is not amplified. Next, when SW- is turned off, that is, during the T1 period, charge feedthrough occurs, but this parasitic voltage VB also becomes only the in-phase voltage component of the differential amplifier and is not amplified. This is because both ends of the switch SW- are balanced from an electrical circuit perspective. In the example of the conventional comparator (FIG. 2), balance has not been obtained, and this not only generates an offset voltage due to charge feedthrough, but also makes it difficult to take measures to reduce it.

第3図のコンパレータの出力端34の゛に圧Vベルで通
常の論理ゲートを駆動することもできる。
It is also possible to drive a conventional logic gate with a voltage V at the output 34 of the comparator of FIG.

また差動形アンプ30を多段直結して、高増幅度のコン
パレータを構成することができる。例えば出力端34に
次段の差動形アンプ30の入力端31を接続すればよい
。また第3図のコンパレータの反転増幅段39ではチャ
ージフィードスルーによる寄生電圧は低減されないが、
初段に比較すると入力換算オフセット電圧への影!#ハ
小さく、無視することができる。以上によシ第3図の本
発明のコンパレータはチャージフィードスルーによるオ
フセット籠圧を低減し、高精度化を図ることができる。
Further, by directly connecting multiple differential amplifiers 30, a comparator with high amplification can be configured. For example, the output terminal 34 may be connected to the input terminal 31 of the differential amplifier 30 at the next stage. Furthermore, although the parasitic voltage due to charge feedthrough is not reduced in the inverting amplification stage 39 of the comparator shown in FIG.
Compared to the first stage, the effect on the input conversion offset voltage! #Ha is small and can be ignored. In view of the above, the comparator of the present invention shown in FIG. 3 can reduce offset cage pressure due to charge feedthrough and achieve high accuracy.

またその回路は簡単で従来コンパレータ(第2図)と同
様にMOS・IC化に適している。
Further, the circuit is simple and suitable for implementation in MOS/IC like the conventional comparator (FIG. 2).

第4図は第3図における差動形アンプ30を2段用いて
コンパレータを構成した1本兄明の他の実施例である。
FIG. 4 shows another embodiment of the one-element comparator in which a comparator is constructed using two stages of the differential amplifiers 30 shown in FIG.

走勤形アンプ30の2つの入力端31.32に双対′電
圧を印加し、これを増幅、出力する構成とした。2つの
入力電圧y 、 、 y、、を交互に入力するだめのス
イッチSW、、SWr 。
A dual voltage is applied to the two input terminals 31 and 32 of the running amplifier 30, and the voltage is amplified and output. Switches SW, , SWr are used to alternately input two input voltages y, , y, .

3W、、8Wアは第3図のタイムチャートに従ってオン
、オフされる。差動形アンプ30の内部スイッチも第3
図と同様のタイムチャートで制御される。
3W, , 8W are turned on and off according to the time chart shown in FIG. The internal switch of the differential amplifier 30 is also the third one.
It is controlled using the same time chart as shown in the figure.

差動形アンプ30が双対の差電圧、すなわち入力端31
ハVt−V−k、入力端32をV、−Vtmを増幅する
ように、入力電圧V r HV 1mを印加するように
したことKより、増幅度を上げることができる。また次
段の差動形アンプはバイアス用スイッチとキャパシタの
ない従来の差動形アンプを用いることができる。この場
合従来の差動形アンプのオフセット電圧Vtは低減され
ていないが、全体のコンパレータの入力換算オフセット
電圧には影響を及ぼさない。初段の大きな増幅度G、に
よって、vlが1000倍されるからである。
The differential amplifier 30 has a dual differential voltage, that is, an input terminal 31
Since the input voltage V r HV 1m is applied to amplify Vt-Vk and -Vtm to the input terminal 32, the degree of amplification can be increased. Further, as the next-stage differential amplifier, a conventional differential amplifier without a bias switch and a capacitor can be used. In this case, although the offset voltage Vt of the conventional differential amplifier is not reduced, it does not affect the input-referred offset voltage of the entire comparator. This is because vl is multiplied by 1000 due to the large amplification G in the first stage.

以上により本発明のコンパレータはMOSスイッチで発
生するチャージフィードスルーの影響をなくシ、オフセ
ット電圧を大幅に低減することが可能である。また回路
構成が簡単で従来コンパレータと同じMOS・ICプロ
セスで製造できるため、IC化に適したものである。
As described above, the comparator of the present invention can eliminate the influence of charge feedthrough that occurs in MOS switches, and can significantly reduce offset voltage. Furthermore, the circuit configuration is simple and can be manufactured using the same MOS/IC process as conventional comparators, making it suitable for IC implementation.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、低オフセツト電圧のMOSサンプル・
ホールド形コ/パレータを提供でき、その回路はIC化
に適しているので、高精度化等の性能の向上、IC化に
よる経済性において特に効果が大きい。
According to the present invention, a low offset voltage MOS sample
Since it is possible to provide a hold type co/parator and the circuit is suitable for IC implementation, it is particularly effective in improving performance such as high precision and economical efficiency by IC implementation.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は従来コンパレータの構成図、第2図はそれのM
OS−FETEよる回路構成を示す図、第3図は本発明
のコンパレータの回路構成を示す図。 第4図は本発明のコンパレータ回路を多段接続して構成
したコンパレータを示す図である。 10.11・・・インバータ、12・・・出力端、20
゜21・・・MOSスイッチ、22.23・・・インバ
ータ、24.25・・・入力端、30・・・差動形アン
プ、31゜32・・・入力端%33.34・・・出力端
、35.36・・・入力端、37・・・インバータ、3
8・・・出力端。 39・・・反転増幅段。
Figure 1 is a configuration diagram of a conventional comparator, and Figure 2 is its M
FIG. 3 is a diagram showing the circuit configuration of the OS-FETE, and FIG. 3 is a diagram showing the circuit configuration of the comparator of the present invention. FIG. 4 is a diagram showing a comparator constructed by connecting the comparator circuits of the present invention in multiple stages. 10.11... Inverter, 12... Output end, 20
゜21...MOS switch, 22.23...Inverter, 24.25...Input terminal, 30...Differential amplifier, 31゜32...Input terminal %33.34...Output End, 35. 36... Input end, 37... Inverter, 3
8...Output end. 39...Inverting amplification stage.

Claims (1)

【特許請求の範囲】 1、キャパシタと反転増幅回路とスイッチより成るコン
パレータにおいて、 該反転増幅回路を差動形増幅回路とし、該差動形増幅回
路の反転出力端と入力端間にスイッチを設け、該差動形
増幅回路の該入力端と他方の入力端間にスイッチを設け
たことを特徴とするコンパレータ。 2、特許請求の範囲第1項記載のコンパレータにおいて
、上記コンパレータの2つの入力端に各各少なくとも2
つの電圧を交互に供給する手段を設けたことを特徴とす
るコンパレータ。
[Claims] 1. In a comparator consisting of a capacitor, an inverting amplifier circuit, and a switch, the inverting amplifier circuit is a differential amplifier circuit, and a switch is provided between the inverting output terminal and the input terminal of the differential amplifier circuit. , a comparator characterized in that a switch is provided between the input terminal and the other input terminal of the differential amplifier circuit. 2. In the comparator according to claim 1, each of the two input terminals of the comparator has at least two
A comparator comprising means for alternately supplying two voltages.
JP60264914A 1985-11-27 1985-11-27 comparator Expired - Lifetime JP2594909B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60264914A JP2594909B2 (en) 1985-11-27 1985-11-27 comparator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60264914A JP2594909B2 (en) 1985-11-27 1985-11-27 comparator

Publications (2)

Publication Number Publication Date
JPS62126709A true JPS62126709A (en) 1987-06-09
JP2594909B2 JP2594909B2 (en) 1997-03-26

Family

ID=17409958

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60264914A Expired - Lifetime JP2594909B2 (en) 1985-11-27 1985-11-27 comparator

Country Status (1)

Country Link
JP (1) JP2594909B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63253726A (en) * 1986-12-09 1988-10-20 Nec Corp Sample-and-hold type succesive approximation a/d converter
JP2001144557A (en) * 1999-11-15 2001-05-25 Asahi Kasei Corp Differential amplifier circuit and amplifier circuit at high temperature
JP2005333635A (en) * 2004-05-11 2005-12-02 Samsung Electronics Co Ltd Analog buffer, display device having analog buffer, and driving method of analog buffer
JP2010226234A (en) * 2009-03-19 2010-10-07 Toshiba Corp Amplifier circuit and magnetic sensor
JP2013070172A (en) * 2011-09-21 2013-04-18 Handotai Rikougaku Kenkyu Center:Kk Time difference amplification circuit
JP2017168968A (en) * 2016-03-15 2017-09-21 株式会社豊田中央研究所 Chopper type comparator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5851612A (en) * 1981-09-22 1983-03-26 Nec Corp Comparison circuit
JPS60198915A (en) * 1984-03-22 1985-10-08 Nec Corp Voltage comparator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5851612A (en) * 1981-09-22 1983-03-26 Nec Corp Comparison circuit
JPS60198915A (en) * 1984-03-22 1985-10-08 Nec Corp Voltage comparator

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63253726A (en) * 1986-12-09 1988-10-20 Nec Corp Sample-and-hold type succesive approximation a/d converter
JP2001144557A (en) * 1999-11-15 2001-05-25 Asahi Kasei Corp Differential amplifier circuit and amplifier circuit at high temperature
JP4498507B2 (en) * 1999-11-15 2010-07-07 旭化成株式会社 Differential amplifier circuit and high-temperature amplifier circuit
JP2005333635A (en) * 2004-05-11 2005-12-02 Samsung Electronics Co Ltd Analog buffer, display device having analog buffer, and driving method of analog buffer
JP2010226234A (en) * 2009-03-19 2010-10-07 Toshiba Corp Amplifier circuit and magnetic sensor
JP2013070172A (en) * 2011-09-21 2013-04-18 Handotai Rikougaku Kenkyu Center:Kk Time difference amplification circuit
US8829985B2 (en) 2011-09-21 2014-09-09 Semiconductor Technology Academic Research Center Time difference amplifier circuit
JP2017168968A (en) * 2016-03-15 2017-09-21 株式会社豊田中央研究所 Chopper type comparator

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