JPS56161711A - Filter circuit - Google Patents

Filter circuit

Info

Publication number
JPS56161711A
JPS56161711A JP6574980A JP6574980A JPS56161711A JP S56161711 A JPS56161711 A JP S56161711A JP 6574980 A JP6574980 A JP 6574980A JP 6574980 A JP6574980 A JP 6574980A JP S56161711 A JPS56161711 A JP S56161711A
Authority
JP
Japan
Prior art keywords
trs
amplifier
output
lpf
collector
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
JP6574980A
Other languages
Japanese (ja)
Other versions
JPH0154884B2 (en
Inventor
Takafumi Okada
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP6574980A priority Critical patent/JPS56161711A/en
Publication of JPS56161711A publication Critical patent/JPS56161711A/en
Publication of JPH0154884B2 publication Critical patent/JPH0154884B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1213—Frequency selective two-port networks using amplifiers with feedback using transistor amplifiers

Landscapes

  • Networks Using Active Elements (AREA)

Abstract

PURPOSE:To constitute a filter so that it is suitable for circuit integration, by using a variable gain amplifier and a capacitor. CONSTITUTION:When a signal is fed to the base of a transistor (TR)Q1 from a signal source 1, this signal is amplified differentially by TRs Q1, Q2, and further differentially amplified by TRs Q6, Q7 and picked up from the connection point between the collector of TRs Q6, Q9 and one end of a capacitor C1. Since the collector output of the TRs Q6, Q9 is negatively fed back by 100% to the base of the (TR)Q2, the gain of an amplifier 2 is 1. If the naked gain of this amplifier 2 is taken as A1, the output impedance R of this amplifier 2 is R=2R1A1. Thus, this circuit operates as an LPF and the output of the LPF is picked up at a terminal T2. A cut-off frequency fC of the output of this LPF is fC=1/4piC1R1A1. Further, if the value of the resistor R1 is in variance, the cutoff frequency fC can be compensated by changing, for example, the collector current of a (TR)Q3 and changing the A1 to the reversing direction.
JP6574980A 1980-05-17 1980-05-17 Filter circuit Granted JPS56161711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6574980A JPS56161711A (en) 1980-05-17 1980-05-17 Filter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6574980A JPS56161711A (en) 1980-05-17 1980-05-17 Filter circuit

Publications (2)

Publication Number Publication Date
JPS56161711A true JPS56161711A (en) 1981-12-12
JPH0154884B2 JPH0154884B2 (en) 1989-11-21

Family

ID=13295971

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6574980A Granted JPS56161711A (en) 1980-05-17 1980-05-17 Filter circuit

Country Status (1)

Country Link
JP (1) JPS56161711A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58161413A (en) * 1982-03-18 1983-09-26 Sony Corp Multi-purpose filter
JPH057126A (en) * 1991-12-06 1993-01-14 Sony Corp Integration circuit
US5361043A (en) * 1992-04-30 1994-11-01 Matsushita Electric Industrial Co., Ltd. Delay circuit for changeably delaying an analog signal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50134540A (en) * 1974-04-15 1975-10-24
JPS5277558A (en) * 1975-12-24 1977-06-30 Hitachi Ltd Variable resistance circuit
JPS5545224A (en) * 1978-09-26 1980-03-29 Sony Corp Filter circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50134540A (en) * 1974-04-15 1975-10-24
JPS5277558A (en) * 1975-12-24 1977-06-30 Hitachi Ltd Variable resistance circuit
JPS5545224A (en) * 1978-09-26 1980-03-29 Sony Corp Filter circuit
JPS5545266A (en) * 1978-09-26 1980-03-29 Sony Corp Filter circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58161413A (en) * 1982-03-18 1983-09-26 Sony Corp Multi-purpose filter
JPH0570966B2 (en) * 1982-03-18 1993-10-06 Sony Corp
JPH057126A (en) * 1991-12-06 1993-01-14 Sony Corp Integration circuit
US5361043A (en) * 1992-04-30 1994-11-01 Matsushita Electric Industrial Co., Ltd. Delay circuit for changeably delaying an analog signal

Also Published As

Publication number Publication date
JPH0154884B2 (en) 1989-11-21

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