JPS5380943A - Controllable attenuator - Google Patents

Controllable attenuator

Info

Publication number
JPS5380943A
JPS5380943A JP15682476A JP15682476A JPS5380943A JP S5380943 A JPS5380943 A JP S5380943A JP 15682476 A JP15682476 A JP 15682476A JP 15682476 A JP15682476 A JP 15682476A JP S5380943 A JPS5380943 A JP S5380943A
Authority
JP
Japan
Prior art keywords
controllable attenuator
crcuit
conveter
ladder
constituting
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
JP15682476A
Other languages
Japanese (ja)
Inventor
Hiroshi Koide
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP15682476A priority Critical patent/JPS5380943A/en
Publication of JPS5380943A publication Critical patent/JPS5380943A/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
    • 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

Abstract

PURPOSE:To reduce the number of the analog switch and to enable a direct control of the attenuation quantity, by constituting the D/A conveter through combination of a ladder-type connection resistance crcuit network and a switch device.
JP15682476A 1976-12-26 1976-12-26 Controllable attenuator Pending JPS5380943A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15682476A JPS5380943A (en) 1976-12-26 1976-12-26 Controllable attenuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15682476A JPS5380943A (en) 1976-12-26 1976-12-26 Controllable attenuator

Publications (1)

Publication Number Publication Date
JPS5380943A true JPS5380943A (en) 1978-07-17

Family

ID=15636138

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15682476A Pending JPS5380943A (en) 1976-12-26 1976-12-26 Controllable attenuator

Country Status (1)

Country Link
JP (1) JPS5380943A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5562510A (en) * 1978-11-02 1980-05-12 Itsuki Ban Electronic volume and automatic sound recording level setting unit using it
JPS5617506A (en) * 1979-07-23 1981-02-19 Sony Corp Digital type gain control device
JPS5862932A (en) * 1981-10-09 1983-04-14 Matsushita Electric Ind Co Ltd Analog switch circuit
JPH03121719U (en) * 1990-03-27 1991-12-12
JPH11298272A (en) * 1998-04-15 1999-10-29 Matsushita Electric Ind Co Ltd Variable amplifier

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5562510A (en) * 1978-11-02 1980-05-12 Itsuki Ban Electronic volume and automatic sound recording level setting unit using it
JPS6217303B2 (en) * 1978-11-02 1987-04-16 Itsuki Ban
JPS5617506A (en) * 1979-07-23 1981-02-19 Sony Corp Digital type gain control device
JPS5862932A (en) * 1981-10-09 1983-04-14 Matsushita Electric Ind Co Ltd Analog switch circuit
JPH03121719U (en) * 1990-03-27 1991-12-12
JPH11298272A (en) * 1998-04-15 1999-10-29 Matsushita Electric Ind Co Ltd Variable amplifier

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