JPS5711511A - Digital control type variable attenuator - Google Patents

Digital control type variable attenuator

Info

Publication number
JPS5711511A
JPS5711511A JP8635180A JP8635180A JPS5711511A JP S5711511 A JPS5711511 A JP S5711511A JP 8635180 A JP8635180 A JP 8635180A JP 8635180 A JP8635180 A JP 8635180A JP S5711511 A JPS5711511 A JP S5711511A
Authority
JP
Japan
Prior art keywords
signal
output
inputted
constitution
attenuating
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
JP8635180A
Other languages
Japanese (ja)
Other versions
JPS6151444B2 (en
Inventor
Koji Ishida
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 JP8635180A priority Critical patent/JPS5711511A/en
Publication of JPS5711511A publication Critical patent/JPS5711511A/en
Publication of JPS6151444B2 publication Critical patent/JPS6151444B2/ja
Granted 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 decrease the harmonic distortion produced at the process of attenuating processing, by the differential amplification of the output obtained through the input of an input signal and its inversion signal to variable attenuators of the same constitution controlled by a digital control signal. CONSTITUTION:An input signal consisting of sinusoidal waves inputted to a terminal IN is inputted to attenuating means 2,4 of the same constitution for the direct output and the output in phase inversion 3 with zero gain via buffer amplifier A1. The means 2,4 attenuate variably the signal inputted by a digital signal applied to terminals D1-D4. To output points J1,J2 of the means 2,4 with this constitution, the fundamental conponent attenuating the input signal is obtained in opposite phase and the 2nd harmonic component by nonlinear characteristics of transistors Q1-Q4, and Q1'-Q4' is inphase. The output at the points J1,J2 is inputted to a differential amplifier means 5 and it has sufficiently smaller gain in comparison with the signal attenuation by the means 2,4, and the fundamental component only not including the 2nd harmonic is differentially amplified and outputted from a terminal OUT.
JP8635180A 1980-06-25 1980-06-25 Digital control type variable attenuator Granted JPS5711511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8635180A JPS5711511A (en) 1980-06-25 1980-06-25 Digital control type variable attenuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8635180A JPS5711511A (en) 1980-06-25 1980-06-25 Digital control type variable attenuator

Publications (2)

Publication Number Publication Date
JPS5711511A true JPS5711511A (en) 1982-01-21
JPS6151444B2 JPS6151444B2 (en) 1986-11-08

Family

ID=13884450

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8635180A Granted JPS5711511A (en) 1980-06-25 1980-06-25 Digital control type variable attenuator

Country Status (1)

Country Link
JP (1) JPS5711511A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308628A2 (en) * 1987-09-19 1989-03-29 Deutsche Thomson-Brandt GmbH Level setting circuit for audio signals
JPH0321110A (en) * 1989-06-19 1991-01-29 Hitachi Ltd Gain control circuit
WO1997022177A1 (en) * 1995-12-13 1997-06-19 Analog Devices Amplifier having linear-in-db gain control

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308628A2 (en) * 1987-09-19 1989-03-29 Deutsche Thomson-Brandt GmbH Level setting circuit for audio signals
JPH01101710A (en) * 1987-09-19 1989-04-19 Deutsche Thomson Brandt Gmbh Circuit apparatus for level adjustment of audio signal
JPH0321110A (en) * 1989-06-19 1991-01-29 Hitachi Ltd Gain control circuit
WO1997022177A1 (en) * 1995-12-13 1997-06-19 Analog Devices Amplifier having linear-in-db gain control
US5684431A (en) * 1995-12-13 1997-11-04 Analog Devices Differential-input single-supply variable gain amplifier having linear-in-dB gain control

Also Published As

Publication number Publication date
JPS6151444B2 (en) 1986-11-08

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