GB1236994A - Electronically variable impedance device - Google Patents

Electronically variable impedance device

Info

Publication number
GB1236994A
GB1236994A GB36653/68A GB3665368A GB1236994A GB 1236994 A GB1236994 A GB 1236994A GB 36653/68 A GB36653/68 A GB 36653/68A GB 3665368 A GB3665368 A GB 3665368A GB 1236994 A GB1236994 A GB 1236994A
Authority
GB
United Kingdom
Prior art keywords
impedance
variable impedance
electronically variable
transistor
resistance
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.)
Expired
Application number
GB36653/68A
Other languages
English (en)
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1236994A publication Critical patent/GB1236994A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/46—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC
    • G05F1/613—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC using semiconductor devices in parallel with the load as final control devices
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers specially adapted therefor
    • G06G7/16—Arrangements for performing computing operations, e.g. operational amplifiers specially adapted therefor for multiplication or division
    • G06G7/163—Arrangements for performing computing operations, e.g. operational amplifiers specially adapted therefor for multiplication or division using a variable impedance controlled by one of the input signals, variable amplification or transfer function
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/36—Amplitude modulation by means of semiconductor device having at least three electrodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/24—Automatic control in frequency-selective amplifiers
    • H03G5/28—Automatic control in frequency-selective amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/14—Control of transmission; Equalising characterised by the equalising network used
    • H04B3/146—Control of transmission; Equalising characterised by the equalising network used using phase-frequency equalisers
    • H04B3/148—Control of transmission; Equalising characterised by the equalising network used using phase-frequency equalisers variable equalisers

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Electromagnetism (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)
GB36653/68A 1967-09-01 1968-08-01 Electronically variable impedance device Expired GB1236994A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US66507467A 1967-09-01 1967-09-01

Publications (1)

Publication Number Publication Date
GB1236994A true GB1236994A (en) 1971-06-23

Family

ID=24668606

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36653/68A Expired GB1236994A (en) 1967-09-01 1968-08-01 Electronically variable impedance device

Country Status (10)

Country Link
US (1) US3539826A (enExample)
JP (1) JPS5345665B1 (enExample)
BE (1) BE719482A (enExample)
CH (1) CH474913A (enExample)
DE (1) DE1791025C3 (enExample)
ES (1) ES356988A1 (enExample)
FR (1) FR1577135A (enExample)
GB (1) GB1236994A (enExample)
NL (1) NL159834B (enExample)
SE (1) SE353425B (enExample)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904971A (en) * 1971-09-29 1975-09-09 Us Navy Automatic gain control amplifier circuit
JPS5344100B2 (enExample) * 1972-10-31 1978-11-25
JPS5947495B2 (ja) * 1975-04-04 1984-11-19 株式会社日立製作所 可変インピ−ダンス回路
GB1573616A (en) * 1976-03-04 1980-08-28 Nat Semiconductor Uk Ltd Electronic impedance devices
DE2655320C3 (de) * 1976-12-07 1987-02-12 Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg Steuerbarer elektronischer Widerstand
US4155059A (en) * 1977-06-14 1979-05-15 Nobuo Doi Circuit network showing proper equivalent impedance between two network terminals
US4339677A (en) * 1979-12-21 1982-07-13 Signetics Corporation Electrically variable impedance circuit with feedback compensation
DE3124231A1 (de) * 1981-06-20 1982-12-30 M.K. Juchheim GmbH & Co, 6400 Fulda Anordnung zur darstellung eines variablen elektrischen praezisionswiderstandes
DE3323651A1 (de) * 1983-07-01 1985-01-17 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung zur erhoehung der querinduktivitaet eines uebertragers
DE3323649C2 (de) 1983-07-01 1987-04-02 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung zur Erhöhung der Induktivität einer Spule
US5623228A (en) * 1993-05-17 1997-04-22 Dan Inbar Non-linear feedback network providing a linear transfer function
US5978024A (en) * 1994-04-15 1999-11-02 Lg Semicon Co., Ltd. Auto variable anti-blooming bias control circuit and method
US6806767B2 (en) * 2002-07-09 2004-10-19 Anadigics, Inc. Power amplifier with load switching circuit
US9754717B2 (en) 2012-05-11 2017-09-05 Momentum Dynamics Corporation Method of and apparatus for generating an adjustable reactance
US9184709B2 (en) * 2013-10-08 2015-11-10 Peregrine Semiconductor Corporation Resonant pre-driver for switching amplifier

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233177A (en) * 1962-09-17 1966-02-01 Tracor Radio frequency receiver gain control system with constant input impedance
US3412340A (en) * 1966-03-03 1968-11-19 Bendix Corp Variable attenuation circuit

Also Published As

Publication number Publication date
SE353425B (enExample) 1973-01-29
NL6812207A (enExample) 1969-03-04
JPS5345665B1 (enExample) 1978-12-08
US3539826A (en) 1970-11-10
CH474913A (de) 1969-06-30
BE719482A (enExample) 1969-01-16
DE1791025C3 (de) 1978-06-08
ES356988A1 (es) 1970-05-01
DE1791025B2 (de) 1977-10-20
FR1577135A (enExample) 1969-08-01
DE1791025A1 (de) 1971-10-21
NL159834B (nl) 1979-03-15

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