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SE7506779L - SYMMETRIC ARRANGEMENT TO ESTABLISH A VARIABLE AC RESISTANCE. - Google Patents

SYMMETRIC ARRANGEMENT TO ESTABLISH A VARIABLE AC RESISTANCE.

Info

Publication number
SE7506779L
SE7506779L SE7506779A SE7506779A SE7506779L SE 7506779 L SE7506779 L SE 7506779L SE 7506779 A SE7506779 A SE 7506779A SE 7506779 A SE7506779 A SE 7506779A SE 7506779 L SE7506779 L SE 7506779L
Authority
SE
Sweden
Prior art keywords
region
layer
resistance
june
junction
Prior art date
Application number
SE7506779A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE413448B (en
Inventor
N J Baars
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Publication of SE7506779L publication Critical patent/SE7506779L/en
Publication of SE413448B publication Critical patent/SE413448B/en

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
    • 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

  • Bipolar Transistors (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Bipolar Integrated Circuits (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

1519831 Semiconductor devices PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 13 June 1975 [17 June 1974] 25370/75 Heading H1K [Also in Divisions H3 and H4] A symmetrical circuit providing a variable A.C. resistance between terminals 7, 8, Fig. 2, comprises an elongated PN junction 26 separating regions 23, 25, a current source 20 connected to 25 substantially midway between 7 and 8, and a controllable current sink 30 connected to region 23, whereby as the sink current Ir is increased, increasing portions of junction 26 are turned on from the middle outwardly so that a central portion of region 25 is shunted by part of region 23. Region 23 may have its effective resistance reduced by (a) a further region 27, Fig. 3a, to be used as a collector, (b) shunting by a conducting layer, (c) a low resistance buried layer 23<SP>1</SP>, or (d) geometry providing a long path from 7 to 8 via region 25 and a short path via region 23, Figs. 4a, 4b (not shown). A P-type semiconductor substrate has a diffused N<SP>+</SP> layer 23<SP>1</SP>, covered by an N epitaxial layer 23. Two surface P regions 25, 27 are then formed in 23, to produce a lateral PNP transistor. Shaded areas 32-38 indicate contact openings in an insulating layer; conductive layers 7, 8, 9, 31, 39, Fig. 3b, provide terminals.
SE7506779A 1974-06-17 1975-06-13 SYMETRIC DEVICE TO CREATE A VARIABLE AC RESISTANCE SE413448B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7408034.A NL161318C (en) 1974-06-17 1974-06-17 SYMMETRICAL DEVICE FOR FORMING AN ADJUSTABLE AC AC RESISTANCE.

Publications (2)

Publication Number Publication Date
SE7506779L true SE7506779L (en) 1975-12-18
SE413448B SE413448B (en) 1980-05-27

Family

ID=19821555

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7506779A SE413448B (en) 1974-06-17 1975-06-13 SYMETRIC DEVICE TO CREATE A VARIABLE AC RESISTANCE

Country Status (14)

Country Link
JP (1) JPS5329584B2 (en)
AR (1) AR205571A1 (en)
AU (1) AU499961B2 (en)
BR (1) BR7503768A (en)
CA (1) CA1035468A (en)
DE (2) DE2526309C3 (en)
ES (1) ES438562A1 (en)
FR (1) FR2275070A1 (en)
GB (1) GB1519831A (en)
HK (1) HK48679A (en)
IT (1) IT1036297B (en)
NL (1) NL161318C (en)
SE (1) SE413448B (en)
ZA (1) ZA753735B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52153651A (en) * 1976-06-17 1977-12-20 Sony Corp Gain changing circuit
US4345214A (en) 1980-04-23 1982-08-17 Rca Corporation Variable emitter degeneration gain-controlled amplifier
US4833422A (en) * 1987-09-24 1989-05-23 Burr-Brown Corporation Programmable gain instrumentation amplifier
DE19713571C1 (en) * 1997-04-02 1998-10-01 Telefunken Microelectron Controlled resistance for semi conductor differencing amplifier

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1320027A (en) 1961-10-19 1963-03-08 Westinghouse Electric Corp Semiconductor potentiometer

Also Published As

Publication number Publication date
AU499961B2 (en) 1979-05-10
ES438562A1 (en) 1977-05-16
FR2275070A1 (en) 1976-01-09
JPS5329584B2 (en) 1978-08-22
DE2526309A1 (en) 1976-01-02
IT1036297B (en) 1979-10-30
NL7408034A (en) 1975-12-19
SE413448B (en) 1980-05-27
AR205571A1 (en) 1976-05-14
DE2560093C3 (en) 1982-01-28
NL161318C (en) 1980-01-15
HK48679A (en) 1979-07-27
CA1035468A (en) 1978-07-25
FR2275070B1 (en) 1980-03-21
BR7503768A (en) 1976-07-06
GB1519831A (en) 1978-08-02
NL161318B (en) 1979-08-15
AU8214675A (en) 1976-12-23
DE2526309C3 (en) 1980-06-04
DE2560093B2 (en) 1981-04-23
ZA753735B (en) 1977-01-26
DE2526309B2 (en) 1979-09-20
JPS5116885A (en) 1976-02-10

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