GB1529235A

GB1529235A – Transistor amplifier
– Google Patents

GB1529235A – Transistor amplifier
– Google Patents
Transistor amplifier

Info

Publication number
GB1529235A

GB1529235A
GB1186/76A
GB118676A
GB1529235A
GB 1529235 A
GB1529235 A
GB 1529235A
GB 1186/76 A
GB1186/76 A
GB 1186/76A
GB 118676 A
GB118676 A
GB 118676A
GB 1529235 A
GB1529235 A
GB 1529235A
Authority
GB
United Kingdom
Prior art keywords
base
current
transistors
collectors
transistor
Prior art date
1975-01-16
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
GB1186/76A
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.)
1975-01-16
Filing date
1976-01-13
Publication date
1978-10-18

1976-01-13
Application filed by RCA Corp
filed
Critical
RCA Corp

1978-10-18
Publication of GB1529235A
publication
Critical
patent/GB1529235A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

H—ELECTRICITY

H03—ELECTRONIC CIRCUITRY

H03F—AMPLIFIERS

H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements

H03F3/45—Differential amplifiers

H03F3/45071—Differential amplifiers with semiconductor devices only

H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection

H—ELECTRICITY

H03—ELECTRONIC CIRCUITRY

H03F—AMPLIFIERS

H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements

H03F3/34—Dc amplifiers in which all stages are dc-coupled

H03F3/343—Dc amplifiers in which all stages are dc-coupled with semiconductor devices only

H—ELECTRICITY

H03—ELECTRONIC CIRCUITRY

H03F—AMPLIFIERS

H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements

H03F3/45—Differential amplifiers

H03F3/45071—Differential amplifiers with semiconductor devices only

H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier

H03F3/4508—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using bipolar transistors as the active amplifying circuit

H03F3/45085—Long tailed pairs

Abstract

1529235 Transistor amplifiers RCA CORPORATION 13 Jan 1976 [16 Jan 1975] 01186/76 Heading H3T A transistor amplifier comprises similar gain bipolar transistors 1′, 2′ of the same conductivity type arranged for operation at substantially the same temperature, and forming an emitter coupled pair, a signal input terminal 5′ connected to the base of 11, D.C. connections between the respective collectors and a supply terminal, at least one connection including a load, and an inverting current amplifier 7′ having a low impedance input 21′ connected to the base of 2′ and an output 22′ connected to the base of 1′, whereby the base current of 11 is a multiple of the base current of 21. It is shown mathematically in the specification that the collector currents of 11 and 21 are determined by the sum of their emitter currents, and the current gain of 7′. Current amplifier 7′ is a current mirror the gain of which is given by the ratio of the base-emitter junction areas of transistors 25′ and 24′, which is substantially independent of temperature. An FET 45 increases the output impedance of 7′, and a further FET 44 is included to match the collector circuits of 24′ and 25′. A source-follower FET 48 is arranged to feed base current to 24′ and 251. A second current mirror 571, similar to 71, is used to couple the collectors of 11 and 21 to output terminal 121. In an alternative arrangement (not illustrated) the emitters of 11 and/or 21 may be resistively linked to node 131, and transistor 36 may be replaced by a pair of transistors having their collectors connected to the respective emitters of 11 and 21. Furthermore 11 and 21 may be replaced by compound transistors.

GB1186/76A
1975-01-16
1976-01-13
Transistor amplifier

Expired

GB1529235A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

US05/541,518

US3938054A
(en)

1975-01-16
1975-01-16
Transistor amplifier

Publications (1)

Publication Number
Publication Date

GB1529235A
true

GB1529235A
(en)

1978-10-18

Family
ID=24159915
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB1186/76A
Expired

GB1529235A
(en)

1975-01-16
1976-01-13
Transistor amplifier

Country Status (6)

Country
Link

US
(1)

US3938054A
(en)

JP
(1)

JPS552766B2
(en)

CA
(1)

CA1073060A
(en)

DE
(1)

DE2601518B2
(en)

FR
(1)

FR2298229A1
(en)

GB
(1)

GB1529235A
(en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4853647A
(en)

*

1988-05-02
1989-08-01
Rca Licensing Corp.
Current gain compensation arrangement

US6275109B1
(en)

*

1999-08-02
2001-08-14
Agere Systems Guardian Corp.
Low noise microphone preamplifier

US8130037B2
(en)

*

2010-03-23
2012-03-06
Analog Devices, Inc.
Apparatus and method for reducing current noise

Family Cites Families (2)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3668541A
(en)

*

1970-03-23
1972-06-06
Teledyne Inc
Current compensator circuit

US3717821A
(en)

*

1972-02-11
1973-02-20
Rca Corp
Circuit for minimizing the signal currents drawn by the input stage of an amplifier

1975

1975-01-16
US
US05/541,518
patent/US3938054A/en
not_active
Expired – Lifetime

1976

1976-01-12
CA
CA243,353A
patent/CA1073060A/en
not_active
Expired

1976-01-13
GB
GB1186/76A
patent/GB1529235A/en
not_active
Expired

1976-01-14
JP
JP375676A
patent/JPS552766B2/ja
not_active
Expired

1976-01-15
FR
FR7600989A
patent/FR2298229A1/en
active
Pending

1976-01-16
DE
DE2601518A
patent/DE2601518B2/en
not_active
Withdrawn

Also Published As

Publication number
Publication date

DE2601518A1
(en)

1976-07-22

DE2601518B2
(en)

1978-07-27

FR2298229A1
(en)

1976-08-13

US3938054A
(en)

1976-02-10

JPS5197358A
(en)

1976-08-26

CA1073060A
(en)

1980-03-04

JPS552766B2
(en)

1980-01-22

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Legal Events

Date
Code
Title
Description

1979-02-07
PS
Patent sealed [section 19, patents act 1949]

1982-08-11
PCNP
Patent ceased through non-payment of renewal fee

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