JPS54121044A - Variable impedance circuit - Google Patents

Variable impedance circuit

Info

Publication number
JPS54121044A
JPS54121044A JP2828378A JP2828378A JPS54121044A JP S54121044 A JPS54121044 A JP S54121044A JP 2828378 A JP2828378 A JP 2828378A JP 2828378 A JP2828378 A JP 2828378A JP S54121044 A JPS54121044 A JP S54121044A
Authority
JP
Japan
Prior art keywords
pair
input
circuit
current
dependency
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
JP2828378A
Other languages
Japanese (ja)
Other versions
JPS61731B2 (en
Inventor
Masayuki Katakura
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP2828378A priority Critical patent/JPS54121044A/en
Priority to US06/018,665 priority patent/US4288707A/en
Priority to EP79100751A priority patent/EP0004099B1/en
Priority to DE7979100751T priority patent/DE2962940D1/en
Publication of JPS54121044A publication Critical patent/JPS54121044A/en
Publication of JPS61731B2 publication Critical patent/JPS61731B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H5/00—One-port networks comprising only passive electrical elements as network components
    • H03H5/02—One-port networks comprising only passive electrical elements as network components without voltage- or current-dependent elements

Landscapes

  • Networks Using Active Elements (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To obtain a variable impedance circuit featuring an excellent linearity and the reduced temperature dependency by using two sets of differential transistor pairs, PN junction pairs, the current mirror circuit and the feedback circuit which feeds the output back to the input terminal respectively. CONSTITUTION:Instantaneous voltage vin applied to terminal 1 is applied to 1st differential Tr pair 11, and the collector of pair 11 is connected to the base of 2nd differential Tr pair 13 as well as to the emitter of load PN junction pair 12. Pair 13 is connected to current mirror circuit 14, and the output of circuit 14 is connected to the input terminal. The emitters of TrQ11 and Q12 forming Tr pair 11 are connected to 1st control current source 15 via feedback resistance R12 and R13, and the emitter of pair 13 is connected to 2nd control current source 16. Input conductance G becomes as shown by Eq. (9), where the input current is iin, the current of source 15 and 16 are IC1 and IC2, and the feedback resistance is RE (RE = R12 = R13). Thus, the input conductance features linear shape with no dependency on the input signal, and can be controlled by the current ratio of the control current source and with no dependency on the temperature.
JP2828378A 1978-03-14 1978-03-14 Variable impedance circuit Granted JPS54121044A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2828378A JPS54121044A (en) 1978-03-14 1978-03-14 Variable impedance circuit
US06/018,665 US4288707A (en) 1978-03-14 1979-03-08 Electrically variable impedance circuit
EP79100751A EP0004099B1 (en) 1978-03-14 1979-03-13 Electrically variable impedance circuit
DE7979100751T DE2962940D1 (en) 1978-03-14 1979-03-13 Electrically variable impedance circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2828378A JPS54121044A (en) 1978-03-14 1978-03-14 Variable impedance circuit

Publications (2)

Publication Number Publication Date
JPS54121044A true JPS54121044A (en) 1979-09-19
JPS61731B2 JPS61731B2 (en) 1986-01-10

Family

ID=12244265

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2828378A Granted JPS54121044A (en) 1978-03-14 1978-03-14 Variable impedance circuit

Country Status (1)

Country Link
JP (1) JPS54121044A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517508A (en) * 1982-05-08 1985-05-14 Toko, Inc. Variable impedance circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517508A (en) * 1982-05-08 1985-05-14 Toko, Inc. Variable impedance circuit

Also Published As

Publication number Publication date
JPS61731B2 (en) 1986-01-10

Similar Documents

Publication Publication Date Title
DE3579303D1 (en) EMITTER COUPLED GATE CIRCUIT.
ES478764A1 (en) Amplifier arrangement with variable gain factor
JPS54121044A (en) Variable impedance circuit
US5130567A (en) Bipolar transistor arrangement with distortion compensation
JPS6439830A (en) A/d converter
JPS55102076A (en) Logarithmic converter
ATE48353T1 (en) BIPOLAR AMPLIFIER CIRCUIT.
JPS5739422A (en) V-i converter
JPS5526790A (en) Emitter follower circuit
JPS57196609A (en) Gain adjusting circuit
JPS55107312A (en) Current mirror circuit
JPS6477208A (en) Differential amplifying circuit
JPS5449053A (en) Signal converter circuit
JPS5563112A (en) Variable gain amplifier circuit
JPS57203114A (en) Power supply circuit
JPS57143909A (en) Variable gain amplifying circuit
JPS5479547A (en) Voltage control oscillator
JPS644108A (en) Gain variable type amplifier circuit
JPS57103417A (en) Gain control circuit
JPS5780814A (en) Transistor device
JPS57181215A (en) Variable gain circuit
JPS5573117A (en) Agc circuit
JPS57143908A (en) Variable gain amplifying circuit
JPS56117414A (en) Gain control circuit
JPS57181216A (en) Variable gain circuit