CA1038048A - Controllable gain signal amplifier - Google Patents

Controllable gain signal amplifier

Info

Publication number
CA1038048A
CA1038048A CA240,523A CA240523A CA1038048A CA 1038048 A CA1038048 A CA 1038048A CA 240523 A CA240523 A CA 240523A CA 1038048 A CA1038048 A CA 1038048A
Authority
CA
Canada
Prior art keywords
current
transistor
coupled
signal amplifier
source
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
CA240,523A
Other languages
English (en)
French (fr)
Inventor
Erwin J. Wittmann
Leopold A. Harwood
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.)
RCA Corp
Original Assignee
RCA 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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of CA1038048A publication Critical patent/CA1038048A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers
    • H03G3/10—Manually-operated control in untuned amplifiers having semiconductor devices
    • 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
    • H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)
CA240,523A 1974-12-06 1975-11-26 Controllable gain signal amplifier Expired CA1038048A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/530,405 US3970948A (en) 1974-12-06 1974-12-06 Controller gain signal amplifier
US05/607,489 US3999141A (en) 1974-12-06 1975-08-25 Controllable gain signal amplifier

Publications (1)

Publication Number Publication Date
CA1038048A true CA1038048A (en) 1978-09-05

Family

ID=27063257

Family Applications (2)

Application Number Title Priority Date Filing Date
CA240,523A Expired CA1038048A (en) 1974-12-06 1975-11-26 Controllable gain signal amplifier
CA252,984A Expired CA1037571A (en) 1974-12-06 1976-05-20 Controllable gain signal amplifier

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA252,984A Expired CA1037571A (en) 1974-12-06 1976-05-20 Controllable gain signal amplifier

Country Status (13)

Country Link
US (2) US3970948A (en])
JP (1) JPS5183455A (en])
AT (1) AT352800B (en])
AU (1) AU497506B2 (en])
BE (1) BE836242A (en])
CA (2) CA1038048A (en])
DE (1) DE2554880B2 (en])
FI (1) FI753370A7 (en])
FR (1) FR2293843A1 (en])
GB (1) GB1524715A (en])
IT (1) IT1044102B (en])
NL (1) NL7514219A (en])
SE (1) SE413065B (en])

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5320844A (en) * 1976-08-11 1978-02-25 Hitachi Ltd Gain control circuit
US4155047A (en) * 1978-01-11 1979-05-15 Baskind David Lee Voltage controlled attenuator
US4318051A (en) * 1980-01-15 1982-03-02 Rca Corporation Symmetrically gain controlled differential amplifier
US4404429A (en) * 1981-05-07 1983-09-13 Rca Corporation Matching volume control characteristics for two channels
US4426625A (en) * 1981-08-27 1984-01-17 Rca Corporation Circuit for linearly gain controlling a differential amplifier
JP4042736B2 (ja) * 2004-02-19 2008-02-06 ソニー株式会社 画像処理装置及び画像処理方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649847A (en) * 1970-10-30 1972-03-14 Rca Corp Electrically controlled attenuation and phase shift circuitry
JPS523528B1 (en]) * 1971-03-05 1977-01-28
US3757240A (en) * 1972-03-15 1973-09-04 Hewlett Packard Co Active attenuator
US3740462A (en) * 1972-04-10 1973-06-19 Rca Corp Automatic chroma gain control system
JPS5620724B2 (en]) * 1972-07-27 1981-05-15
US3750042A (en) * 1972-08-21 1973-07-31 Gen Electric Amplifier of controllable gain
US3875522A (en) * 1973-04-13 1975-04-01 Signetics Corp Integrated direct-coupled electronic attenuator
US3887938A (en) * 1974-03-18 1975-06-03 Motorola Inc IC color demodulator with single external picture control

Also Published As

Publication number Publication date
AU8713375A (en) 1977-06-09
ATA925675A (de) 1979-03-15
AT352800B (de) 1979-10-10
NL7514219A (nl) 1976-06-09
FR2293843A1 (fr) 1976-07-02
SE413065B (sv) 1980-03-31
AU497506B2 (en) 1978-12-14
US3999141A (en) 1976-12-21
DE2554880A1 (de) 1976-06-10
BE836242A (fr) 1976-04-01
CA1037571A (en) 1978-08-29
DE2554880B2 (de) 1980-08-21
IT1044102B (it) 1980-03-20
JPS5183455A (en]) 1976-07-22
SE7513451L (sv) 1976-06-08
FI753370A7 (en]) 1976-06-07
GB1524715A (en) 1978-09-13
US3970948A (en) 1976-07-20

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