GB952904A - Improvements in or relating to amplifiers - Google Patents

Improvements in or relating to amplifiers

Info

Publication number
GB952904A
GB952904A GB2074661A GB2074661A GB952904A GB 952904 A GB952904 A GB 952904A GB 2074661 A GB2074661 A GB 2074661A GB 2074661 A GB2074661 A GB 2074661A GB 952904 A GB952904 A GB 952904A
Authority
GB
United Kingdom
Prior art keywords
transistor
resistor
amplifying transistor
gain
base
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
GB2074661A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB952904A publication Critical patent/GB952904A/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
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0082—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using bipolar transistor-type devices

Abstract

952,904. Gain control. TELEFUNKEN PATENTVERWERTUNGS-G.m.b.H. June 8, 1961 [June 9, 1960], No. 20746/61. Headings H3Q, H3T and H4R. In a transistor amplifier the gain is controlled by means of a further transistor 13, Fig. 1, the collector-emitter path of which shunts the base bias resistor 5 of the amplifying transistor 6. The gain controlling voltage is applied to the base of the further transistor 13, the collectoremitter path impedance of which is reduced by means of collector to base negative feed-back over resistor 14, which may be adjustable, and blocking capacitor 15. The arrangement is such that as the current through the further transistor 13 is varied it both varies gain by variation of the base bias on the amplifying transistor 6 and by forming a variable impedance A.C. shunt upon the input, controlling the signal applied to the base of amplifying transistor 6. To enable the gain to be reduced to zero, there is included in series with the emitter bias resistor 9 of the amplifying transistor 6 a biasing source 16. In an alternative embodiment the further transistor 13, Fig. 2, is used to vary the emitter bias of and also the negative feed-back around, the amplifying transistor 6. To this end its collector-emitter path is included in the emitter circuit of the amplifying transistor 6 in series with bias resistor 9. Negative feed-back is again applied to the further transistor 13 by means of adjustable resistor 14 and D.C, blocking capacitor 15. Resistor 19 permits collector current to flow in the further transistor 13 even when the amplifying transistor 6 is biased to cut-off. It is stated in the Specification that the invention may also be applied to circuits employing thermionic valves.
GB2074661A 1960-06-09 1961-06-08 Improvements in or relating to amplifiers Expired GB952904A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1960T0018509 DE1247405B (en) 1960-06-09 1960-06-09 Single-stage transistor amplifier that can be regulated over a wide range

Publications (1)

Publication Number Publication Date
GB952904A true GB952904A (en) 1964-03-18

Family

ID=7548970

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2074661A Expired GB952904A (en) 1960-06-09 1961-06-08 Improvements in or relating to amplifiers

Country Status (2)

Country Link
DE (1) DE1247405B (en)
GB (1) GB952904A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3412340A (en) * 1966-03-03 1968-11-19 Bendix Corp Variable attenuation circuit
US3447094A (en) * 1967-03-24 1969-05-27 Philco Ford Corp Ultralinear gain controllable amplifier
FR2031219A5 (en) * 1969-01-29 1970-11-13 Rca Corp
US3708699A (en) * 1970-07-10 1973-01-02 Ibm High-speed analog switching with fet
JPS4966337U (en) * 1972-09-22 1974-06-10
US4345214A (en) 1980-04-23 1982-08-17 Rca Corporation Variable emitter degeneration gain-controlled amplifier
EP0599327A1 (en) * 1992-11-25 1994-06-01 Nec Corporation Variable gain amplifier
EP0825709A1 (en) * 1996-08-14 1998-02-25 Nec Corporation Grounded-emitter amplifier circuit with an attenuator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1274672A (en) * 1968-09-27 1972-05-17 Rca Corp Operational amplifier

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750150C (en) * 1935-12-16 1944-12-20 Marconi Wireless Telegraph Co Receiver with a device for automatic loss compensation
DE730244C (en) * 1937-12-17 1943-01-08 Telefunken Gmbh Amplifier with gain control and negative feedback
DE701325C (en) * 1937-12-17 1941-01-14 Telefunken Gmbh Amplifier with gain control by changing the grid bias
DE1003803B (en) * 1955-04-05 1957-03-07 Philips Nv Electrical two-pole with relatively low direct current and relatively high alternating current impedance
DE1071136B (en) * 1957-05-24

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3412340A (en) * 1966-03-03 1968-11-19 Bendix Corp Variable attenuation circuit
US3447094A (en) * 1967-03-24 1969-05-27 Philco Ford Corp Ultralinear gain controllable amplifier
FR2031219A5 (en) * 1969-01-29 1970-11-13 Rca Corp
US3708699A (en) * 1970-07-10 1973-01-02 Ibm High-speed analog switching with fet
JPS4966337U (en) * 1972-09-22 1974-06-10
JPS5352366Y2 (en) * 1972-09-22 1978-12-14
US4345214A (en) 1980-04-23 1982-08-17 Rca Corporation Variable emitter degeneration gain-controlled amplifier
EP0599327A1 (en) * 1992-11-25 1994-06-01 Nec Corporation Variable gain amplifier
EP0825709A1 (en) * 1996-08-14 1998-02-25 Nec Corporation Grounded-emitter amplifier circuit with an attenuator

Also Published As

Publication number Publication date
DE1247405B (en) 1967-08-17

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