JPS5563112A - Variable gain amplifier circuit - Google Patents

Variable gain amplifier circuit

Info

Publication number
JPS5563112A
JPS5563112A JP13698978A JP13698978A JPS5563112A JP S5563112 A JPS5563112 A JP S5563112A JP 13698978 A JP13698978 A JP 13698978A JP 13698978 A JP13698978 A JP 13698978A JP S5563112 A JPS5563112 A JP S5563112A
Authority
JP
Japan
Prior art keywords
current
trq1
input
transistors
amplifier 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.)
Pending
Application number
JP13698978A
Other languages
Japanese (ja)
Inventor
Tadahiro Yamaguchi
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic 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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP13698978A priority Critical patent/JPS5563112A/en
Publication of JPS5563112A publication Critical patent/JPS5563112A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier in emitter-coupled or cascode amplifiers

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To improve the linearity between the input and the output by connecting the current Miller circuit to the collectors of the 1st and 2nd transistors and thus supplying the equal current to both transistors. CONSTITUTION:The emitters of 1st and and 2nd NPN transistors TrQ1 and Q2 are connected in common to current source IA, and at the same time the current Miller circuit consisting of PNPTrQ7-Q9 is connected to the collectors of TrQ1 and Q2. As a result, the equal current I2 can be supplied to TrQ1 and Q2. While the equal current I1 is supplied in the same way to 3rd and 4th TrQ3 and Q4. In such constitution, output current i2 is expressed by Eq. (8) (i1 is the input current, current source IB=2I1). And as it is clear in Eq. (8), the linear control is possible for input/output current gain i2/i1 by varying the ratio between current sources IA and IB.
JP13698978A 1978-11-07 1978-11-07 Variable gain amplifier circuit Pending JPS5563112A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13698978A JPS5563112A (en) 1978-11-07 1978-11-07 Variable gain amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13698978A JPS5563112A (en) 1978-11-07 1978-11-07 Variable gain amplifier circuit

Publications (1)

Publication Number Publication Date
JPS5563112A true JPS5563112A (en) 1980-05-13

Family

ID=15188169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13698978A Pending JPS5563112A (en) 1978-11-07 1978-11-07 Variable gain amplifier circuit

Country Status (1)

Country Link
JP (1) JPS5563112A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471311A (en) * 1981-04-10 1984-09-11 Pioneer Electronic Corporation Detector circuit having AGC function
US4496860A (en) * 1981-03-27 1985-01-29 Pioneer Electronic Corporation Voltage-controlled attenuator
US5157350A (en) * 1991-10-31 1992-10-20 Harvey Rubens Analog multipliers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4496860A (en) * 1981-03-27 1985-01-29 Pioneer Electronic Corporation Voltage-controlled attenuator
US4471311A (en) * 1981-04-10 1984-09-11 Pioneer Electronic Corporation Detector circuit having AGC function
US5157350A (en) * 1991-10-31 1992-10-20 Harvey Rubens Analog multipliers
WO1993009598A1 (en) * 1991-10-31 1993-05-13 Harvey Alan Rubens Improved analog multipliers

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