JPS5678225A - Variable attenuating circuit - Google Patents

Variable attenuating circuit

Info

Publication number
JPS5678225A
JPS5678225A JP15483679A JP15483679A JPS5678225A JP S5678225 A JPS5678225 A JP S5678225A JP 15483679 A JP15483679 A JP 15483679A JP 15483679 A JP15483679 A JP 15483679A JP S5678225 A JPS5678225 A JP S5678225A
Authority
JP
Japan
Prior art keywords
terminals
terminal
analog signal
switches
resistor
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
JP15483679A
Other languages
Japanese (ja)
Inventor
Haruo Amano
Masamichi Imai
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15483679A priority Critical patent/JPS5678225A/en
Publication of JPS5678225A publication Critical patent/JPS5678225A/en
Pending 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
    • H03H11/24—Frequency-independent attenuators

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Attenuators (AREA)

Abstract

PURPOSE:To adapt a variable attenating circuit to LSI implementation by enabling the control of a computer by supplying an analog signal input to resistors, connected to switches respectively, via an input buffer amplifying circuit. CONSTITUTION:An analog signal voltage applied to signal input terminal 1 is passed through input buffer amplifier 4 and led to terminals (a) of N switches 701...70N and one terminal of resistor 61. Then, terminals (b) of switches 701- 70N are grounded and terminals (c) are also connected to one-side terminals of resistor groups 601-60N provided as many as the power of ''2''. The other-side terminals of N+1-number resistances of resistor groups 601-60N and 61 are all connected in common to the input terminal of output buffer amplifier 5 and the analog signal output of amplifier 5 is outputted from terminal 3. Consequently, since each switch can be controlled externally, the attenuation can be set under the control of a computer and a relative resistance value is required, so that this will be suitable to LSI implementation.
JP15483679A 1979-11-29 1979-11-29 Variable attenuating circuit Pending JPS5678225A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15483679A JPS5678225A (en) 1979-11-29 1979-11-29 Variable attenuating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15483679A JPS5678225A (en) 1979-11-29 1979-11-29 Variable attenuating circuit

Publications (1)

Publication Number Publication Date
JPS5678225A true JPS5678225A (en) 1981-06-27

Family

ID=15592935

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15483679A Pending JPS5678225A (en) 1979-11-29 1979-11-29 Variable attenuating circuit

Country Status (1)

Country Link
JP (1) JPS5678225A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60206209A (en) * 1984-03-29 1985-10-17 Teac Co Sound volume controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60206209A (en) * 1984-03-29 1985-10-17 Teac Co Sound volume controller
JPH0352684B2 (en) * 1984-03-29 1991-08-12 Teac Corp

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