JPS57159106A - Gain control circuit for voltage controlled amplifier - Google Patents

Gain control circuit for voltage controlled amplifier

Info

Publication number
JPS57159106A
JPS57159106A JP4388881A JP4388881A JPS57159106A JP S57159106 A JPS57159106 A JP S57159106A JP 4388881 A JP4388881 A JP 4388881A JP 4388881 A JP4388881 A JP 4388881A JP S57159106 A JPS57159106 A JP S57159106A
Authority
JP
Japan
Prior art keywords
voltage
circuit
amplifier
switch
controlled
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
JP4388881A
Other languages
Japanese (ja)
Inventor
Yasuhiko Atsumi
Teisho Fujiyama
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 JP4388881A priority Critical patent/JPS57159106A/en
Publication of JPS57159106A publication Critical patent/JPS57159106A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/001—Digital control of analog signals

Abstract

PURPOSE:To achieve gain control efficiently with a simple constitution, by distributing an output voltage of a D/A converter through time division, and storing (n) sets of control voltages controlling (n) sets of voltage controlled amplifiers as voltage values. CONSTITUTION:When a switch element 5a, e.g. of a switch circuit 5 is closed, a control circuit 2 outputs a digital data to control a voltage controlled amplifier 1a of a voltage controlling variable gain circuit 1 corresponding to the element 5a. This data is D/A-converted 4 and charged in a capacitor 6a via a switch 5a. If the input impedance of the circuit 1 is very large, the voltage of the capacitor 6a is stored even after the switch 5a is opend and the amplifier 1a of the circuit 1 is controlled with the voltage value. Similarly, a voltage controlled amplifier 1b is controlled. With the repetition of this step, the data is given to the amplifier 1a after a prescribed time.
JP4388881A 1981-03-27 1981-03-27 Gain control circuit for voltage controlled amplifier Pending JPS57159106A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4388881A JPS57159106A (en) 1981-03-27 1981-03-27 Gain control circuit for voltage controlled amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4388881A JPS57159106A (en) 1981-03-27 1981-03-27 Gain control circuit for voltage controlled amplifier

Publications (1)

Publication Number Publication Date
JPS57159106A true JPS57159106A (en) 1982-10-01

Family

ID=12676236

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4388881A Pending JPS57159106A (en) 1981-03-27 1981-03-27 Gain control circuit for voltage controlled amplifier

Country Status (1)

Country Link
JP (1) JPS57159106A (en)

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