JPS57181499A - Sample hold circuit for output of photodetector - Google Patents

Sample hold circuit for output of photodetector

Info

Publication number
JPS57181499A
JPS57181499A JP56046088A JP4608881A JPS57181499A JP S57181499 A JPS57181499 A JP S57181499A JP 56046088 A JP56046088 A JP 56046088A JP 4608881 A JP4608881 A JP 4608881A JP S57181499 A JPS57181499 A JP S57181499A
Authority
JP
Japan
Prior art keywords
sample hold
fet18
gate
fet
capacitor
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
Application number
JP56046088A
Other languages
Japanese (ja)
Inventor
Masatoshi Ida
Kenichi Oikami
Asao Hayashi
Masahiro Aoki
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical Co 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP56046088A priority Critical patent/JPS57181499A/en
Publication of JPS57181499A publication Critical patent/JPS57181499A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C27/00—Electric analogue stores, e.g. for storing instantaneous values
    • G11C27/02—Sample-and-hold arrangements
    • G11C27/024—Sample-and-hold arrangements using a capacitive memory element

Landscapes

  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To obtain sample hold in accurately response to amount of photo detection, by connecting an auxiliary FET to a switching FET for sample hold and correcting the effect of the capacitance of the FET. CONSTITUTION:A switching FET18-1 for sample turns on with a sample hold signal via an inverter 33-1 of a sample hold circuit 11-1, and a voltage at point X corresponding to the amount of photo detection via a capacitor 13-1 and a photodetector 12-1 is sampled and stored in a capacitor 19-1. An auxiliary FET 31-1 which is the same characteristics as those of the FET18-1 and in which the source and the drain are shortened is connected in series between the FET18-1 and the capacitor 19-1, and a signal opposite to a sample hold signal applied to the gate of the FET18-1 is applied to the gate of the FET31-1. Thus, the storage charge due to capacitors between the gate and source and the gate and drain of both the FETs18-1 and 31-1 is cancelled with each other, allowing to avoid the generation of noise and obtain sample hold a voltage in accurately response to the amount of photo detection.
JP56046088A 1981-03-28 1981-03-28 Sample hold circuit for output of photodetector Pending JPS57181499A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56046088A JPS57181499A (en) 1981-03-28 1981-03-28 Sample hold circuit for output of photodetector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56046088A JPS57181499A (en) 1981-03-28 1981-03-28 Sample hold circuit for output of photodetector

Publications (1)

Publication Number Publication Date
JPS57181499A true JPS57181499A (en) 1982-11-08

Family

ID=12737225

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56046088A Pending JPS57181499A (en) 1981-03-28 1981-03-28 Sample hold circuit for output of photodetector

Country Status (1)

Country Link
JP (1) JPS57181499A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6003429A (en) * 1995-07-06 1999-12-21 Komatsu Ltd. High speed and high-load cylinder device and method for controlling the same
US9688041B2 (en) 2009-12-17 2017-06-27 Trumpf Maschinen Austria Gmbh & Co. Kg. Drive device for a bending press

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6003429A (en) * 1995-07-06 1999-12-21 Komatsu Ltd. High speed and high-load cylinder device and method for controlling the same
US9688041B2 (en) 2009-12-17 2017-06-27 Trumpf Maschinen Austria Gmbh & Co. Kg. Drive device for a bending press

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