JPS6469111A - Automatic variable resistor circuit - Google Patents

Automatic variable resistor circuit

Info

Publication number
JPS6469111A
JPS6469111A JP22711287A JP22711287A JPS6469111A JP S6469111 A JPS6469111 A JP S6469111A JP 22711287 A JP22711287 A JP 22711287A JP 22711287 A JP22711287 A JP 22711287A JP S6469111 A JPS6469111 A JP S6469111A
Authority
JP
Japan
Prior art keywords
clock
frequency
switched capacitor
circuit
integration device
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
JP22711287A
Other languages
Japanese (ja)
Inventor
Toshiaki Oda
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP22711287A priority Critical patent/JPS6469111A/en
Publication of JPS6469111A publication Critical patent/JPS6469111A/en
Pending legal-status Critical Current

Links

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  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To constitute the title circuit with a small component area by provid ing a variable frequency divider and an integration device amplifying the input signal by a gain based on the frequency of the 2nd clock. CONSTITUTION:In receiving a 1st clock, the variable frequency divider 10 frequency-divides the clock by a prescribed frequency division number based on a control signal to output the 2nd clock. The 1st and 2nd switched capacitor circuits 12, 13 of the integration device 11 are sampled respectively by 1st and 2nd clocks. The 1st and 2nd switched capacitor circuits 12, 13 are replaced into resistors equivalently and the resistance is decided by the frequency of the 1st and 2nd clocks. On the other hand, the integration device 11 outputs the input signal while amplifying it and the gain is varied with the equivalent resistance of the 2nd switched capacitor circuit 13 decided based on the 2nd clock frequency. Thus, the frequency division number of the variable frequency divider 10 is changed by the control signal and the output signal voltage is varied stepwise. Thus, the circuit is constituted by a small element area.
JP22711287A 1987-09-10 1987-09-10 Automatic variable resistor circuit Pending JPS6469111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22711287A JPS6469111A (en) 1987-09-10 1987-09-10 Automatic variable resistor circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22711287A JPS6469111A (en) 1987-09-10 1987-09-10 Automatic variable resistor circuit

Publications (1)

Publication Number Publication Date
JPS6469111A true JPS6469111A (en) 1989-03-15

Family

ID=16855665

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22711287A Pending JPS6469111A (en) 1987-09-10 1987-09-10 Automatic variable resistor circuit

Country Status (1)

Country Link
JP (1) JPS6469111A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009231864A (en) * 2008-03-19 2009-10-08 Citizen Holdings Co Ltd Variable gain amplifier
JP2016528854A (en) * 2013-12-04 2016-09-15 シーエスエムシー テクノロジーズ エフエイビー１ カンパニー リミテッド Sensor control circuit and electronic device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009231864A (en) * 2008-03-19 2009-10-08 Citizen Holdings Co Ltd Variable gain amplifier
JP2016528854A (en) * 2013-12-04 2016-09-15 シーエスエムシー テクノロジーズ エフエイビー１ カンパニー リミテッド Sensor control circuit and electronic device

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