GB952249A - Improvements in or relating to transistor amplifier circuits - Google Patents

Improvements in or relating to transistor amplifier circuits

Info

Publication number
GB952249A
GB952249A GB372262A GB372262A GB952249A GB 952249 A GB952249 A GB 952249A GB 372262 A GB372262 A GB 372262A GB 372262 A GB372262 A GB 372262A GB 952249 A GB952249 A GB 952249A
Authority
GB
United Kingdom
Prior art keywords
transistor
gain
control
jan
transistors
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
GB372262A
Inventor
Peter Sidney Pearce
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.)
IRIS PRODUCTIONS Ltd
Original Assignee
IRIS PRODUCTIONS 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 IRIS PRODUCTIONS Ltd filed Critical IRIS PRODUCTIONS Ltd
Priority to GB372262A priority Critical patent/GB952249A/en
Publication of GB952249A publication Critical patent/GB952249A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier in emitter-coupled or cascode amplifiers

Landscapes

  • Picture Signal Circuits (AREA)

Abstract

952,249. Transistor gain control circuits. IRIS PRODUCTIONS Ltd. Jan. 30, 1963 [Jan. 31, 1962], No. 3722/62. Heading H3T. A variable gain transistor amplifier, particularly for television fading, comprises a long-tailed pair S2, S4 with a third control transistor S3 in the common tail, the input signal being applied to one transistor of the long-tailed pair and the control signal to the third transistor. In the Figure, a video signal is applied to transistor S2 via an emitter follower S1 and a gain controlling pre-set network R3, C4. The emitters of transistors S2, S4 are coupled by a reversible electrolytic capacitor C4 to reduce degenerative feed-back and the output from the longtailed pair is taken from the collector of transistor S4 and fed to the output emitter follower transistor S5. The supply voltage for the transistors is stabilized by Zener diode S6. Linear variation of the control current supplied to the base of transistor S3 effects linear variation of the overall gain to zero or cut-off.
GB372262A 1962-01-31 1962-01-31 Improvements in or relating to transistor amplifier circuits Expired GB952249A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB372262A GB952249A (en) 1962-01-31 1962-01-31 Improvements in or relating to transistor amplifier circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB372262A GB952249A (en) 1962-01-31 1962-01-31 Improvements in or relating to transistor amplifier circuits

Publications (1)

Publication Number Publication Date
GB952249A true GB952249A (en) 1964-03-11

Family

ID=9763731

Family Applications (1)

Application Number Title Priority Date Filing Date
GB372262A Expired GB952249A (en) 1962-01-31 1962-01-31 Improvements in or relating to transistor amplifier circuits

Country Status (1)

Country Link
GB (1) GB952249A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731215A (en) * 1971-08-06 1973-05-01 Gen Electric Amplifier of controllable gain

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731215A (en) * 1971-08-06 1973-05-01 Gen Electric Amplifier of controllable gain

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