JPS6485408A - Automatic zero circuit - Google Patents

Automatic zero circuit

Info

Publication number
JPS6485408A
JPS6485408A JP62242929A JP24292987A JPS6485408A JP S6485408 A JPS6485408 A JP S6485408A JP 62242929 A JP62242929 A JP 62242929A JP 24292987 A JP24292987 A JP 24292987A JP S6485408 A JPS6485408 A JP S6485408A
Authority
JP
Japan
Prior art keywords
fet
gate
fet switch
offset
fets
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.)
Granted
Application number
JP62242929A
Other languages
Japanese (ja)
Other versions
JPH0732331B2 (en
Inventor
Yoshihiro Okano
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Electric 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 Yokogawa Electric Corp filed Critical Yokogawa Electric Corp
Priority to JP62242929A priority Critical patent/JPH0732331B2/en
Publication of JPS6485408A publication Critical patent/JPS6485408A/en
Publication of JPH0732331B2 publication Critical patent/JPH0732331B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To reduce both offset and offset drift by canceling the electric charge injected from a gate terminal of an FET switch to an RC filter by an electric charge injected from the other terminal of the FET circuit. CONSTITUTION:The capacitance between both gates of two FETs Q3, Q4 in an FET circuit 4 is the combination of parallel connection between the series connection of two gate-source capacitors and the series connection of two gate- rain capacitors. Since the same characteristic of FETs Q3, Q4 is adopted for the FET switch Q1, the FETs are of nearly the same capacitor characteristic as that of the FET switch Q1 including the temperature characteristic. Since the gate terminal of the FET Q4 is driven by a signal in opposite phase to the gate input of the FET switch Q1, that is, in phase with the gate input of the FET switch Q2, a spike current in opposite polarity with the spike current from the gate terminal of the FET switch Q1 is injected to a capacitor C2. Thus, both the offset and offset drift are reduced.
JP62242929A 1987-09-28 1987-09-28 Auto zero circuit Expired - Lifetime JPH0732331B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62242929A JPH0732331B2 (en) 1987-09-28 1987-09-28 Auto zero circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62242929A JPH0732331B2 (en) 1987-09-28 1987-09-28 Auto zero circuit

Publications (2)

Publication Number Publication Date
JPS6485408A true JPS6485408A (en) 1989-03-30
JPH0732331B2 JPH0732331B2 (en) 1995-04-10

Family

ID=17096315

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62242929A Expired - Lifetime JPH0732331B2 (en) 1987-09-28 1987-09-28 Auto zero circuit

Country Status (1)

Country Link
JP (1) JPH0732331B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002237744A (en) * 2001-02-08 2002-08-23 Hioki Ee Corp Fet switch and automatic zero correction circuit
JP2011242370A (en) * 2010-05-21 2011-12-01 Renesas Electronics Corp Impedance detection circuit and adjustment method of impedance detection circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002237744A (en) * 2001-02-08 2002-08-23 Hioki Ee Corp Fet switch and automatic zero correction circuit
JP2011242370A (en) * 2010-05-21 2011-12-01 Renesas Electronics Corp Impedance detection circuit and adjustment method of impedance detection circuit

Also Published As

Publication number Publication date
JPH0732331B2 (en) 1995-04-10

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