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GB1480301A - Amplifier insensitive to the polarity of the supply voltage - Google Patents

Amplifier insensitive to the polarity of the supply voltage

Info

Publication number
GB1480301A
GB1480301A GB31667/75A GB3166775A GB1480301A GB 1480301 A GB1480301 A GB 1480301A GB 31667/75 A GB31667/75 A GB 31667/75A GB 3166775 A GB3166775 A GB 3166775A GB 1480301 A GB1480301 A GB 1480301A
Authority
GB
United Kingdom
Prior art keywords
amplifier
voltage
supply
current
polarity
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
GB31667/75A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1480301A publication Critical patent/GB1480301A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/302—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in bipolar transistor amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

1480301 Transistor amplifiers INTERNATIONAL STANDARD ELECTRIC CORP 29 July 1975 [5 Aug 1974] 31667/75 Heading H3T An amplifier, e.g. for a telephone microphone M, which is insensitive to the polarity of the D.C. supply, comprises first and second multistage amplifiers connected generally in parallel, corresponding transistors in each amplifier being complementary to each other, the amplifier which operates depending on the supply polarity, and biasing means being provided responsive to the operation of one amplifier to disable the other. Transistors SC1, SC3, SC5 form the first amplifier and SC2, SC4, SC6 the second. When SC1 &c. is operating SC2 &c. is biased off by the collector-base leakage current of SC6, which holds SC4 off. A transistor SC7 provides regulating means for operation over a range of supply currents, the collector current of SC7 increasing if the supply current through R17 increases because the base-emitter voltage of SC7 depends on the voltage between the points E and B. With low currents through R11, R14, diode D3 does not conduct, but with sufficient current D3 clamps the voltage across R14, and the voltage across R11 controls SC7. Conversely, when SC2 &c. is operating SC3 is biased off by the leakage current of SC5, and SC8 with R12, R15 and D4 regulate the supply current. Diodes D1, D2 temperature compens sate SC1, SC2 respectively, and mirror across the microphone M the voltage drops across R7, R8. Positive feedback to shape the frequency response is provided by C4, R16.
GB31667/75A 1974-08-05 1975-07-29 Amplifier insensitive to the polarity of the supply voltage Expired GB1480301A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AUPB840774 1974-08-05

Publications (1)

Publication Number Publication Date
GB1480301A true GB1480301A (en) 1977-07-20

Family

ID=3765962

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31667/75A Expired GB1480301A (en) 1974-08-05 1975-07-29 Amplifier insensitive to the polarity of the supply voltage

Country Status (3)

Country Link
AU (1) AU8348075A (en)
GB (1) GB1480301A (en)
ZA (1) ZA754737B (en)

Also Published As

Publication number Publication date
AU8348075A (en) 1977-02-03
ZA754737B (en) 1976-06-30

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed