JPS5491034A - Variable attenuator circuit of voltage control type - Google Patents

Variable attenuator circuit of voltage control type

Info

Publication number
JPS5491034A
JPS5491034A JP15795377A JP15795377A JPS5491034A JP S5491034 A JPS5491034 A JP S5491034A JP 15795377 A JP15795377 A JP 15795377A JP 15795377 A JP15795377 A JP 15795377A JP S5491034 A JPS5491034 A JP S5491034A
Authority
JP
Japan
Prior art keywords
fets
attenuation
input
elements
attenuator 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
JP15795377A
Other languages
Japanese (ja)
Inventor
Kiyoshi Sasaki
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 JP15795377A priority Critical patent/JPS5491034A/en
Publication of JPS5491034A publication Critical patent/JPS5491034A/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
    • H03H11/245—Frequency-independent attenuators using field-effect transistor

Landscapes

  • Networks Using Active Elements (AREA)

Abstract

PURPOSE:To vary the attenuation amount while maintaining constant input impedance by one or several FETs as elements of attenuation-amount variable arms of a bridge T type attenuator circuit and by controlling terminals between sources and gates of FETs by the input voltage of a differential amplifier circuit. CONSTITUTION:For elements N1 and N2 of attenuation-amount varying arms of the bridge T type attenuator circuit, two FETs are used with drains D connected to sources S of opposite FETs and gates G connected in common. Output terminals 15 and 16 of the circuit using those FETs are connected to the collector of the transistor of the differential amplifier provided with constant-current supply 21 to control voltage V1 from input terminal 29, thereby varying the attenuation amounts of elements N1 and N2. Then, an input signal between signal input terminals 1 and 2 is attenuated while maintainig constant impedance characteristics so as to obtain an output signal with the attenuation amount varied between output terminals 3 and 4.
JP15795377A 1977-12-28 1977-12-28 Variable attenuator circuit of voltage control type Pending JPS5491034A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15795377A JPS5491034A (en) 1977-12-28 1977-12-28 Variable attenuator circuit of voltage control type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15795377A JPS5491034A (en) 1977-12-28 1977-12-28 Variable attenuator circuit of voltage control type

Publications (1)

Publication Number Publication Date
JPS5491034A true JPS5491034A (en) 1979-07-19

Family

ID=15661062

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15795377A Pending JPS5491034A (en) 1977-12-28 1977-12-28 Variable attenuator circuit of voltage control type

Country Status (1)

Country Link
JP (1) JPS5491034A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5661818A (en) * 1979-10-25 1981-05-27 Yokogawa Hokushin Electric Corp Sine wave oscillator
US5087899A (en) * 1988-05-19 1992-02-11 Siemens-Albis Ag Variable attenuation network with constant input and output resistances

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5661818A (en) * 1979-10-25 1981-05-27 Yokogawa Hokushin Electric Corp Sine wave oscillator
JPS6145901B2 (en) * 1979-10-25 1986-10-11 Yokogawa Hokushin Electric
US5087899A (en) * 1988-05-19 1992-02-11 Siemens-Albis Ag Variable attenuation network with constant input and output resistances

Similar Documents

Publication Publication Date Title
JPS53106532A (en) Logic circuit
JPS5491034A (en) Variable attenuator circuit of voltage control type
ES449996A1 (en) Arrangement for producing pulse-shaped signals
JPS6430315A (en) High frequency attenuator
SE7506200L (en) REINFORCEMENT CONTROL CIRCUIT
JPS5767331A (en) Bias varying circuit
ES488456A1 (en) Controlled voltage source variable equalization network
JPS5398762A (en) Differential amplifier circuit
JPS56116328A (en) Multiplexer circuit
JPS5427341A (en) Nonlinear distortion compensation device
JPS5762609A (en) Gain control amplifier
JPS56140721A (en) Voltage comparator
JPS5769915A (en) Automatic gain control circuit
JPS56157569A (en) Logarithmic amplifier
SU647850A1 (en) Controllable amplifier
JPS57208718A (en) Control circuit for voltage controlled variable attenuator
JPS5398763A (en) Amplifier unit
JPS52100952A (en) Variable impedance property circuit
JPS57192194A (en) Speaker system
JPS5691509A (en) Amplitude modulating circuit
JPS5568729A (en) Input circuit with input level decision
JPS5260544A (en) Signal converter circuit
FR2436397A2 (en) Interference component suppression circuit - processes test signals in nonlinear circuit with automatically adjustable dead zone
JPS54100640A (en) Variable equalizer
JPS5556711A (en) Variable gain amplifing circuit