JP7420588B2 - 演算増幅器 - Google Patents
演算増幅器 Download PDFInfo
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- JP7420588B2 JP7420588B2 JP2020028195A JP2020028195A JP7420588B2 JP 7420588 B2 JP7420588 B2 JP 7420588B2 JP 2020028195 A JP2020028195 A JP 2020028195A JP 2020028195 A JP2020028195 A JP 2020028195A JP 7420588 B2 JP7420588 B2 JP 7420588B2
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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
- H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
- H03F3/45632—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit
- H03F3/45744—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit by offset reduction
- H03F3/45748—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit by offset reduction by using a feedback circuit
- H03F3/45753—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit by offset reduction by using a feedback circuit using switching means, e.g. sample and hold
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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
- H03F3/45179—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
- H03F3/4521—Complementary long tailed pairs having parallel inputs and being supplied in parallel
- H03F3/45219—Folded cascode stages
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
-
- 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
- H03F3/45224—Complementary Pl types having parallel inputs and being supplied in parallel
- H03F3/45233—Folded cascode stages
-
- 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
- H03F3/45273—Mirror types
-
- 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
- H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
- H03F3/45632—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit
- H03F3/45744—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit by offset reduction
- H03F3/45766—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit by offset reduction by using balancing means
-
- 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
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45212—Indexing scheme relating to differential amplifiers the differential amplifier being designed to have a reduced offset
-
- 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
- H03F2203/72—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
- H03F2203/7227—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal the gated amplifier being switched on or off by a switch in the supply circuit of the amplifier
-
- 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
-
- 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
- H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
- H03F3/45632—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit
- H03F3/45636—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit by using feedback means
- H03F3/45641—Measuring at the loading circuit of the differential amplifier
- H03F3/45659—Controlling the loading circuit of the differential amplifier
Description
これにより、
図3は、実施例1に係る演算増幅器1Aの回路図である。演算増幅器1Aは、PMOS入力差動対10、NMOS入力差動対12、第1入力テイル電流源14、第2入力テイル電流源16、出力段20、第1補正回路40、第2補正回路70を備える。
図5は、比較技術1に係る演算増幅器1Sの等価回路図である。この構成は、図3の演算増幅器1Aから、第2補正回路70を省略した構成とみなすことができる。
(VOSP-VOUT)G1-VOUT×GS=V1
VOUT=V1×G0
VOUT=G0{(VOSP-VOUT)G1-VOUT×GS)}
VOUT/G0=(VOSP-VOUT)G1-VOUT×GS)≒0
VOUT(G1+GS)=VOSPG1
VOUT=VOSP/(1+GS/G1)
VOUT=VOSP/(1+GS1/G1)
したがって、GS1≫G1が成り立つとき、オフセット電圧VOSPの影響は、第1補正回路40によって補正される。
VOUT=VOSN/(1+GS2/G2)
したがって、GS2≫G2が成り立つとき、オフセット電圧VOSNの影響は、第2補正回路70によって補正される。
VOUT=VOSP/(1+(GS1+GS2)/G1)
(GS1+GS2)≫G1が成り立つから、オフセット電圧VOSPの影響は、第1補正回路40および第2補正回路70の両方によって補正される。
VOUT=VOSN/(1+(GS1+GS2)/G2)
(GS1+GS2)≫G2が成り立つから、オフセット電圧VOSNの影響は、第1補正回路40および第2補正回路70の両方によって補正される。
PMOS入力差動対10を構成するPMOSトランジスタ、NMOS入力差動対12を構成するNMOSトランジスタのしきい値電圧がばらつくと、遷移領域において、オフセット電圧がピークやディップを有する場合がある。図11(a)、(b)は、遷移領域におけるオフセット電圧のピークやディップを示す図である。図11(a)に示すように、PMOS入力差動対10およびNMOS入力差動対12の動作領域は、一点鎖線や破線で示すようにばらつく。このばらつきに起因して、図11(b)に示すように、遷移領域において、オフセット電圧にはピーク(破線)やディップ(一点鎖線)が発生する場合がある。実施例2では、遷移領域におけるオフセット電圧をフラットにする技術を説明する。
停止回路66は、ソース同士、ドレイン同士が接続されたPMOSトランジスタMP15,MP16を含む。PMOSトランジスタMP15、MP16それぞれのゲートには、入力電圧V+,V-が印加される。
10 PMOS入力差動対
12 NMOS入力差動対
14 第1入力テイル電流源
16 第2入力テイル電流源
20 出力段
21 下側回路
22 上側回路
23 バイアス回路
24 定電流回路
25 ゲート接地回路
26 定電流回路
27 ゲート接地回路
40 第1補正回路
50 第1補正差動アンプ
52 PMOS補正差動対
54 第1補正テイル電流源
56 第1負荷回路
58 第1オフセット電流源
60 第1gmアンプ
62 PMOS差動対
64 電流源
66 停止回路
68 可変電流源
70 第2補正回路
80 第2補正差動アンプ
82 NMOS補正差動対
84 第2補正テイル電流源
86 第2負荷回路
88 第2オフセット電流源
90 第2gmアンプ
92 NMOS差動対
94 電流源
Vp 第1入力電圧
Vn 第2入力電圧
INN 反転入力端子
INP 非反転入力端子
Claims (8)
- 第1入力電圧を受ける非反転入力端子および第2入力電圧を受ける反転入力端子と、
前記非反転入力端子および前記反転入力端子と接続されるPMOS入力差動対と、
前記PMOS入力差動対のソースと接続される第1入力テイル電流源と、
前記非反転入力端子および前記反転入力端子と接続されるNMOS入力差動対と、
前記NMOS入力差動対のソースと接続される第2入力テイル電流源と、
前記PMOS入力差動対および前記NMOS入力差動対の出力を受ける出力段と、
前記PMOS入力差動対のオフセット電圧を補正する第1補正回路と、
前記NMOS入力差動対のオフセット電圧を補正する第2補正回路と、
を備え、
前記第1補正回路は、
前記非反転入力端子および前記反転入力端子と接続されるPMOS補正差動対を含む第1補正差動アンプと、
前記第1補正差動アンプの出力信号を電流信号に変換し、前記出力段に供給する第1gmアンプと、
を含むことにより、前記PMOS入力差動対の動作領域と、前記NMOS入力差動対の動作領域と、前記PMOS入力差動対と前記NMOS入力差動対の両方が同時に動作する遷移領域と、において、前記PMOS入力差動対のオフセット電圧を補正できるように構成され、
前記第2補正回路は、
前記非反転入力端子および前記反転入力端子と接続されるNMOS補正差動対を含む第2補正差動アンプと、
前記第2補正差動アンプの出力信号を電流信号に変換し、前記出力段に供給する第2gmアンプと、
を含むことにより、前記PMOS入力差動対の動作領域と、前記NMOS入力差動対の動作領域と、前記PMOS入力差動対と前記NMOS入力差動対の両方が同時に動作する遷移領域と、において、前記NMOS入力差動対のオフセット電圧を補正できるように構成されることを特徴とする演算増幅器。 - 前記第1補正差動アンプは、前記PMOS補正差動対に加えて、
前記PMOS補正差動対のソースと接続される第1補正テイル電流源と、
前記PMOS補正差動対のドレインと接続される第1負荷回路および第1補正電流源と、 を含み、
前記第2補正差動アンプは、前記NMOS補正差動対に加えて、
前記NMOS補正差動対のソースと接続される第2補正テイル電流源と、
前記NMOS補正差動対のドレインと接続される第2負荷回路および第2補正電流源と、
を含むことを特徴とする請求項1に記載の演算増幅器。 - 前記出力段は、
前記PMOS入力差動対の差動電流および前記第1補正回路の差動電流を折り返す第1定電流回路と、
前記第1定電流回路によって折り返される差動電流の経路に設けられる第1ゲート接地回路と、
前記NMOS入力差動対の差動電流および前記第2補正回路の差動電流を折り返す第2定電流回路と、
前記第2定電流回路によって折り返される差動電流の経路に設けられる第2ゲート接地回路と、
を含むことを特徴とする請求項1または2に記載の演算増幅器。 - 前記第1入力テイル電流源の電流は、前記第1入力電圧および前記第2入力電圧の増大にともなって減少し、
前記第2入力テイル電流源の電流は、前記第1入力テイル電流源の電流に対して相補的に変化することを特徴とする請求項1から3のいずれかに記載の演算増幅器。 - 前記第1入力テイル電流源の電流は、前記第1入力電圧および前記第2入力電圧の増大にともなって減少し、
前記第2入力テイル電流源および前記第2gmアンプの電流は、前記第1入力テイル電流源の電流に対して相補的に変化することを特徴とする請求項1または2に記載の演算増幅器。 - 前記第1gmアンプは、
PMOS差動対と、
前記PMOS差動対のソース側に設けられる電流源と、
前記PMOS差動対と前記電流源の間に設けられ、前記PMOS入力差動対に流れる電流がゼロになると、遮断状態となる停止回路と、
を含むことを特徴とする請求項5に記載の演算増幅器。 - 前記停止回路は、ソース同士、ドレイン同士が接続される2個のPMOSトランジスタを含み、一方のゲートは前記反転入力端子と接続され、他方のゲートは前記非反転入力端子と接続されることを特徴とする請求項6に記載の演算増幅器。
- 前記第1gmアンプは、前記電流源と前記停止回路の接続ノードから、前記第1入力テイル電流源の電流に対して相補的に変化する電流をシンクする可変電流源をさらに含むことを特徴とする請求項6または7に記載の演算増幅器。
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JP2010041131A (ja) | 2008-07-31 | 2010-02-18 | Toshiba Corp | 演算増幅器 |
JP2014204291A (ja) | 2013-04-04 | 2014-10-27 | 富士電機株式会社 | 演算増幅回路 |
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FR2728743B1 (fr) * | 1994-12-21 | 1997-03-14 | Sgs Thomson Microelectronics | Amplificateur a grande excursion de mode commun et a transconductance constante |
JPH08204468A (ja) * | 1995-01-20 | 1996-08-09 | Seikosha Co Ltd | 演算増幅器 |
JP2010222965A (ja) | 2009-02-25 | 2010-10-07 | Yoshimasa Fujiwara | 振動感知によるロック解除装置及びこれを備えたロック解除装置付き錠 |
US9742397B2 (en) * | 2015-11-30 | 2017-08-22 | Silicon Laboratories Inc. | Apparatus for offset correction in electronic circuitry and associated methods |
JP6917234B2 (ja) * | 2017-07-26 | 2021-08-11 | ローム株式会社 | 集積回路及び集積回路の製造方法 |
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JP2010041131A (ja) | 2008-07-31 | 2010-02-18 | Toshiba Corp | 演算増幅器 |
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