JP2017118351A - 差動増幅回路 - Google Patents
差動増幅回路 Download PDFInfo
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- JP2017118351A JP2017118351A JP2015252370A JP2015252370A JP2017118351A JP 2017118351 A JP2017118351 A JP 2017118351A JP 2015252370 A JP2015252370 A JP 2015252370A JP 2015252370 A JP2015252370 A JP 2015252370A JP 2017118351 A JP2017118351 A JP 2017118351A
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- amplifier circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
- H03F1/0216—Continuous control
- H03F1/0222—Continuous control by using a signal derived from the input signal
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
- H03F3/3001—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor with field-effect transistors
- H03F3/3033—NMOS SEPP output stages
- H03F3/3035—NMOS SEPP output stages using differential amplifiers as phase-splitting elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
- H03F3/3001—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor with field-effect transistors
- H03F3/3038—PMOS SEPP output stages
- H03F3/304—PMOS SEPP output stages using differential amplifiers as phase-splitting element
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/72—Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/30—Indexing scheme relating to single-ended push-pull [SEPP]; Phase-splitters therefor
- H03F2203/30087—Only the bias of the pull transistor of the SEPP being dynamically controlled by the input signal
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/30—Indexing scheme relating to single-ended push-pull [SEPP]; Phase-splitters therefor
- H03F2203/30099—Indexing scheme relating to single-ended push-pull [SEPP]; Phase-splitters therefor the pull transistor being gated by a switching element
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
- H03F3/45183—Long tailed pairs
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
Description
差動増幅回路の機能は、2つの入力電圧の差分を増幅することであるが、電池駆動のモバイル電子機器に代表されるように、低消費電流化と小型軽量化が常に求められている。
2段の増幅回路と直列接続された2段の出力トランジスタを有し、2つの出力トランジスタうち一方の制御を1段目の増幅回路の出力により行い、他方を2段目の増幅回路の出力で制御されるドレイン接地回路(ソースフォロア)として構成した。
本実施形態の差動増幅回路は、増幅回路1と、増幅回路2と、N型MOSトランジスタの出力トランジスタ3及び4とを備えている。
上述した図1の回路は、入力端子IP及びINの電圧差を増幅した電圧を出力端子OUTに出力する差動増幅回路を構成している。
差動増幅回路の入力端子IPとINの電圧差が正の場合、増幅回路1の出力端子OPと出力端子ONとの電位差も正となり、出力端子OPの電圧は電源電圧に近づき、出力端子ONの電圧はグラウンド電圧に近づく。そして、出力トランジスタ3は、ゲート電圧が小さくなるので、電流駆動能力は小さくなる。出力端子OPと出力端子ONの電位差が正の場合、増幅回路2の出力端子GHの電圧は電源電圧に近づく。そして、出力トランジスタ4は、ゲート電圧が大きくなるので、電流駆動能力は大きくなる。従って、差動増幅回路は、出力端子OUTに入力端子IPとINの電圧差に応じた高い電圧を出力する。
なお、増幅回路1の出力端子OPと出力端子ONの電圧の変化量の絶対値は、必ずしも同等である必要はなく、出力端子OPの電圧の変化量はゼロでも構わない。
上述したように、本実施形態の差動増幅回路は、出力トランジスタ3のゲートを増幅回路1の出力端子ONに接続する構成としたので、増幅回路が1つ削減され、従来技術に比較して消費電流と回路面積を削減することが可能となった。
PMOSトランジスタ5は、ゲートに制御信号端子ENBが接続され、ソースは電源に接続され、ドレインは出力トランジスタ4のドレインに接続されている。
PMOSトランジスタ5は、制御信号端子ENBがグラウンド電圧のときオン状態となり、制御信号端子ENBが電源電圧のときオフ状態になる、スイッチとして機能する。
なお、通常、PMOSトランジスタ5のサイズは、オン状態では十分オン抵抗が小さく、オフ状態では十分リーク電流が小さくなるようにサイズを設定することが容易である。
3、4 N型MOSトランジスタ
5 P型MOSトランジスタ
Claims (2)
- 第1の入力電圧と第2の入力電圧の差分を増幅する差動増幅回路であって、
前記第1及び第2の入力電圧の差分を増幅し、第1の出力電圧と第2の出力電圧の差として出力する第1の増幅回路と、
前記第1の増幅回路の出力電圧の差をさらに増幅する第2の増幅回路と、
直列接続された第1の出力トランジスタと第2の出力トランジスタと、を有し、
前記第1の出力トランジスタは、ゲートに前記第1の出力電圧が入力され、ソースが第2の電源端子に接続され、ドレインが出力端子に接続され、
前記第2の出力トランジスタは、ゲートに前記第2の増幅回路の出力電圧が入力され、ソースが前記出力端子に接続され、ドレインが第1の電源端子に接続され、
ていることを特徴とする差動増幅回路。 - 前記第2の出力トランジスタのドレインは、スイッチとして機能するトランジスタを介して前記第1の電源端子に接続されることを特徴とする、請求項1に記載の差動増幅回路。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015252370A JP6571518B2 (ja) | 2015-12-24 | 2015-12-24 | 差動増幅回路 |
TW105140995A TWI677185B (zh) | 2015-12-24 | 2016-12-12 | 差動放大電路 |
US15/385,116 US9979351B2 (en) | 2015-12-24 | 2016-12-20 | Differential amplifier circuit |
CN201611205248.7A CN107026624A (zh) | 2015-12-24 | 2016-12-23 | 差动放大电路 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015252370A JP6571518B2 (ja) | 2015-12-24 | 2015-12-24 | 差動増幅回路 |
Publications (2)
Publication Number | Publication Date |
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JP2017118351A true JP2017118351A (ja) | 2017-06-29 |
JP6571518B2 JP6571518B2 (ja) | 2019-09-04 |
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JP2015252370A Active JP6571518B2 (ja) | 2015-12-24 | 2015-12-24 | 差動増幅回路 |
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US (1) | US9979351B2 (ja) |
JP (1) | JP6571518B2 (ja) |
CN (1) | CN107026624A (ja) |
TW (1) | TWI677185B (ja) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS575404A (en) * | 1980-05-09 | 1982-01-12 | Philips Nv | Arithmetic amplifier |
JPH05218755A (ja) * | 1992-01-31 | 1993-08-27 | Sony Corp | 広帯域出力回路 |
JPH0856128A (ja) * | 1994-08-12 | 1996-02-27 | Nec Corp | 演算増幅器 |
JPH11154832A (ja) * | 1997-11-19 | 1999-06-08 | Fujitsu Ltd | 差動増幅回路及びオペアンプ回路 |
JP2001053559A (ja) * | 1999-08-10 | 2001-02-23 | Oki Micro Design Co Ltd | 演算増幅器 |
JP2004222015A (ja) * | 2003-01-16 | 2004-08-05 | Fuji Electric Device Technology Co Ltd | 増幅回路 |
WO2015168497A1 (en) * | 2014-05-01 | 2015-11-05 | Texas Instruments Incorporated | Current-limiting in an amplifier system |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03274911A (ja) | 1990-03-26 | 1991-12-05 | Hitachi Ltd | 演算増幅器 |
JPH05191162A (ja) * | 1991-09-18 | 1993-07-30 | Hitachi Ltd | 演算増幅器および回線終端装置 |
CN101183270B (zh) * | 2007-11-21 | 2010-06-02 | 北京中星微电子有限公司 | 一种低压差稳压器 |
JP5412968B2 (ja) * | 2009-06-09 | 2014-02-12 | 富士通セミコンダクター株式会社 | オペアンプ |
CN101651449B (zh) * | 2009-09-03 | 2011-06-15 | 上海博为光电科技有限公司 | 一种用于光通信接收机的光输入前置放大器 |
-
2015
- 2015-12-24 JP JP2015252370A patent/JP6571518B2/ja active Active
-
2016
- 2016-12-12 TW TW105140995A patent/TWI677185B/zh active
- 2016-12-20 US US15/385,116 patent/US9979351B2/en active Active
- 2016-12-23 CN CN201611205248.7A patent/CN107026624A/zh active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS575404A (en) * | 1980-05-09 | 1982-01-12 | Philips Nv | Arithmetic amplifier |
JPH05218755A (ja) * | 1992-01-31 | 1993-08-27 | Sony Corp | 広帯域出力回路 |
JPH0856128A (ja) * | 1994-08-12 | 1996-02-27 | Nec Corp | 演算増幅器 |
JPH11154832A (ja) * | 1997-11-19 | 1999-06-08 | Fujitsu Ltd | 差動増幅回路及びオペアンプ回路 |
JP2001053559A (ja) * | 1999-08-10 | 2001-02-23 | Oki Micro Design Co Ltd | 演算増幅器 |
JP2004222015A (ja) * | 2003-01-16 | 2004-08-05 | Fuji Electric Device Technology Co Ltd | 増幅回路 |
WO2015168497A1 (en) * | 2014-05-01 | 2015-11-05 | Texas Instruments Incorporated | Current-limiting in an amplifier system |
Also Published As
Publication number | Publication date |
---|---|
TW201725851A (zh) | 2017-07-16 |
JP6571518B2 (ja) | 2019-09-04 |
US20170187330A1 (en) | 2017-06-29 |
US9979351B2 (en) | 2018-05-22 |
TWI677185B (zh) | 2019-11-11 |
CN107026624A (zh) | 2017-08-08 |
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