JPS6448510A - Filter circuit - Google Patents

Filter circuit

Info

Publication number
JPS6448510A
JPS6448510A JP20401487A JP20401487A JPS6448510A JP S6448510 A JPS6448510 A JP S6448510A JP 20401487 A JP20401487 A JP 20401487A JP 20401487 A JP20401487 A JP 20401487A JP S6448510 A JPS6448510 A JP S6448510A
Authority
JP
Japan
Prior art keywords
current
equivalently
amplifier circuit
component
circuit
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
JP20401487A
Other languages
Japanese (ja)
Other versions
JPH0824251B2 (en
Inventor
Yuichi Okubo
Tetsuo Sato
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP20401487A priority Critical patent/JPH0824251B2/en
Publication of JPS6448510A publication Critical patent/JPS6448510A/en
Publication of JPH0824251B2 publication Critical patent/JPH0824251B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To equivalently increase the impedance by reducing equivalently a current flowing to an impedance means being a component of the titled filter by the impedance conversion action of a voltage follower circuit and a current source circuit giving a current according to its current. CONSTITUTION:A 1st amplifier circuit AMP 1 using PNP and NPN transistors(TR) and output TRs of current mirror form, and a 2nd amplifier circuit AMP 2 provided with a current amplification function to the current mirror form TRs are provided. Then an input signal is given to an input terminal of the 1st amplifier circuit AMP 1 and a reference voltage is supplied to an input terminal of the 2nd amplifier circuit AMP 2. The current flowing to a capacitor C1 being a component of the filter is reduced equivalently by the impedance conversion action of the voltage follower circuit and the current source circuit outputting a current according to its current. Thus, the capacitance of the capacitor C1 being a component of the filter circuit viewed from the side of the input signal is increased equivalently.
JP20401487A 1987-08-19 1987-08-19 Filter circuit Expired - Fee Related JPH0824251B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20401487A JPH0824251B2 (en) 1987-08-19 1987-08-19 Filter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20401487A JPH0824251B2 (en) 1987-08-19 1987-08-19 Filter circuit

Publications (2)

Publication Number Publication Date
JPS6448510A true JPS6448510A (en) 1989-02-23
JPH0824251B2 JPH0824251B2 (en) 1996-03-06

Family

ID=16483341

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20401487A Expired - Fee Related JPH0824251B2 (en) 1987-08-19 1987-08-19 Filter circuit

Country Status (1)

Country Link
JP (1) JPH0824251B2 (en)

Also Published As

Publication number Publication date
JPH0824251B2 (en) 1996-03-06

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees