WO2015182361A1 - Circuit d'amplification et capteur d'image - Google Patents

Circuit d'amplification et capteur d'image Download PDF

Info

Publication number
WO2015182361A1
WO2015182361A1 PCT/JP2015/063488 JP2015063488W WO2015182361A1 WO 2015182361 A1 WO2015182361 A1 WO 2015182361A1 JP 2015063488 W JP2015063488 W JP 2015063488W WO 2015182361 A1 WO2015182361 A1 WO 2015182361A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
amplifier circuit
switch
current source
amplification
Prior art date
Application number
PCT/JP2015/063488
Other languages
English (en)
Japanese (ja)
Inventor
康大 篠塚
雅則 古田
圭 白石
Original Assignee
株式会社 東芝
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 株式会社 東芝 filed Critical 株式会社 東芝
Publication of WO2015182361A1 publication Critical patent/WO2015182361A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/70—SSIS architectures; Circuits associated therewith
    • H04N25/71—Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
    • H04N25/75—Circuitry for providing, modifying or processing image signals from the pixel array
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/70—Charge amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters

Definitions

  • the comparator opens and closes the first reset switch and the second reset switch according to the comparison result between the input voltage and the voltage at the first connection point.
  • FIG. 3 is a diagram illustrating operation waveforms of the amplifier circuit according to the present embodiment.
  • the amplifier circuit 2 amplifies the signal component of V PIX , that is, the difference between the voltage V CM and the voltage V PIX .
  • the reset signals ⁇ RST1 and ⁇ RST2 are collectively referred to as a reset signal ⁇ RST .
  • the capacitor C 1 is connected to a current source I CP1, one end of the voltage of the capacitor C 1, i.e., the voltage V FB becomes ramp descending in proportion to time.
  • the voltage v FB after the time T from the start of the amplification operation is expressed by the following equation.
  • Equation (14) is the number of times that the amplification operation is repeated.
  • the second term of Equation (14) is referred to as an overshoot voltage v OS .
  • V SIG decreases by the amount of the overshoot voltage v OS , and the accuracy of the gain A decreases.
  • a current mirror circuit is used as the current source ICP2 , if V SIG decreases too much, the operating region of the MOSFET changes from the saturation region to the linear region, and the accuracy of the current mirror decreases. For this reason, problems such as deterioration of the linearity of gain A and gain error occur.
  • the amplifier circuit 2 it is possible to reduce a gain error caused by variation in the current value of the current source and obtain a desired gain. Thereby, the amplification accuracy can be improved. Further, since the gain error can be reduced without increasing the channel length or channel width of the MOSFET, the circuit area can be reduced.
  • FIG. 16 is a schematic configuration diagram illustrating an image sensor according to the present embodiment.
  • this image sensor is a CMOS image sensor, and includes a pixel array 101, a row selection circuit 102, a readout circuit 103, and a control signal generation circuit 104.
  • the image sensor may be configured to include the digital circuit 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Amplifiers (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

[Problème] La présente invention concerne un circuit d'amplification de faible superficie et de faible erreur de gain due à une capacité parasite, et un capteur d'image. [Solution] Selon un mode de réalisation de la présente invention, un circuit d'amplification (2) est doté d'une première et d'une deuxième source de courant (ICP1, ICP2), d'un premier et d'un deuxième condensateur intégré (C1, C2), d'un premier et d'un deuxième commutateur d'amplification (SA1, SA2), d'un premier et d'un deuxième commutateur de réinitialisation (SR1, SR2), et d'un comparateur (21). Le premier (deuxième) condensateur intégré est relié entre la première (deuxième) source de courant et une première (troisième) source de tension. Le premier (deuxième) commutateur d'amplification est relié entre la première (deuxième) source de courant et le premier (deuxième) condensateur intégré. Le premier (deuxième) commutateur de réinitialisation est relié entre un premier (deuxième) point de connexion au niveau duquel le premier (deuxième) condensateur intégré et le premier (deuxième) commutateur d'amplification sont reliés l'un à l'autre, et une deuxième (quatrième) source de tension. Le comparateur (21) ouvre/ferme le premier interrupteur de réinitialisation (SR1) et le deuxième commutateur de réinitialisation (SR2) correspondant aux résultats d'une comparaison entre une tension d'entrée et une tension au niveau du premier point de connexion.
PCT/JP2015/063488 2014-05-26 2015-05-11 Circuit d'amplification et capteur d'image WO2015182361A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-108426 2014-05-26
JP2014108426A JP2015226103A (ja) 2014-05-26 2014-05-26 増幅回路及びイメージセンサ

Publications (1)

Publication Number Publication Date
WO2015182361A1 true WO2015182361A1 (fr) 2015-12-03

Family

ID=54698701

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/063488 WO2015182361A1 (fr) 2014-05-26 2015-05-11 Circuit d'amplification et capteur d'image

Country Status (2)

Country Link
JP (1) JP2015226103A (fr)
WO (1) WO2015182361A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9912898B2 (en) 2015-09-09 2018-03-06 Kabushiki Kaisha Toshiba Amplifier, electric circuit, and image sensor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7242331B1 (en) * 2006-03-29 2007-07-10 Realtek Semiconductor Corp. Error averaging comparator based switch capacitor circuit and method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7242331B1 (en) * 2006-03-29 2007-07-10 Realtek Semiconductor Corp. Error averaging comparator based switch capacitor circuit and method thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
J.K. FIORENZA ET AL.: "Comparator-Based Switched-Capacitor Circuits for Scaled CMOS Technologies", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 41, no. 12, December 2006 (2006-12-01), pages 2658 - 2668, XP011150721, ISSN: 0018-9200 *
N. KATIC ET AL.: "Column-separated compressive sampling scheme for low power CMOS image sensors", NEW CIRCUITS AND SYSTEMS CONFERENCE (NEWCAS, 16 June 2013 (2013-06-16), pages 3, XP032447571 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9912898B2 (en) 2015-09-09 2018-03-06 Kabushiki Kaisha Toshiba Amplifier, electric circuit, and image sensor

Also Published As

Publication number Publication date
JP2015226103A (ja) 2015-12-14

Similar Documents

Publication Publication Date Title
US7295143B2 (en) Semiconductor integrated circuit device
CN106470322B (zh) 减轻图像传感器的列固定图案噪声的读出电路
US7535398B2 (en) Correlated double-sampling circuit and cyclic analog-to-digital converter including the same
JP5801665B2 (ja) 固体撮像装置、ａ／ｄ変換器およびその制御方法
KR20170079091A (ko) 램프 신호 발생 장치 및 그를 이용한 씨모스 이미지 센서
US7224306B2 (en) Analog-to-digital converter in which settling time of amplifier circuit is reduced
CN109698918B (zh) 单斜率比较装置及包括其的模数转换装置和cmos图像传感器
US10079989B2 (en) Image capturing device
KR102148801B1 (ko) 램프 신호 발생 장치 및 그를 이용한 씨모스 이미지 센서
US9331683B2 (en) Ramp signal generator with noise canceling function
US9848154B2 (en) Comparator with correlated double sampling scheme and operating method thereof
JP2008054256A (ja) アナログデジタル変換器およびそれを用いた撮像回路
WO2016191852A1 (fr) Circuits de capteur d'image, et procédés
US11516421B2 (en) Solid-state imaging device
US9667891B2 (en) Image sensor
US9160948B2 (en) Replica noise generator using pixel modeling and ramp signal generator including the same
US8723099B2 (en) Solid-state imaging apparatus
KR102506833B1 (ko) 램프 신호 발생 장치 및 그를 이용한 씨모스 이미지 센서
WO2015182361A1 (fr) Circuit d'amplification et capteur d'image
JP2017112605A (ja) 撮像装置
JP6445746B2 (ja) 逐次比較型ａ／ｄ変換装置、撮像装置、内視鏡および設定方法
JP2014175930A (ja) アナログデジタル変換器
CN112640435A (zh) 固态成像元件和电子设备
JP2017055241A (ja) 増幅器、電気回路、及びイメージセンサ
US8471753B1 (en) Pipelined analog-to-digital converter and method for converting analog signal to digital signal

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15798671

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15798671

Country of ref document: EP

Kind code of ref document: A1