GB1328940A - Amplifier circuits - Google Patents

Amplifier circuits

Info

Publication number
GB1328940A
GB1328940A GB3779772A GB3779772A GB1328940A GB 1328940 A GB1328940 A GB 1328940A GB 3779772 A GB3779772 A GB 3779772A GB 3779772 A GB3779772 A GB 3779772A GB 1328940 A GB1328940 A GB 1328940A
Authority
GB
United Kingdom
Prior art keywords
resistors
resistor
input
output
voltage feedback
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
GB3779772A
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.)
HP Inc
Original Assignee
Hewlett Packard Co
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 Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of GB1328940A publication Critical patent/GB1328940A/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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/347—Negative-feedback-circuit arrangements with or without positive feedback using transformers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/26—Push-pull amplifiers; Phase-splitters therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/12—Arrangements for reducing cross-talk between channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Amplifiers (AREA)
  • Networks Using Active Elements (AREA)
  • Picture Signal Circuits (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

1328940 Transistor amplifying circuits HEWLETT-PACKARD CO 14 Aug 1972 [23 Aug 1971] 37797/72 Heading H3T In a transistor amplifier for a cable television system both current and voltage feedback are applied, and the loop phase shift is of the order of 90 degrees. In one embodiment, voltage feedback is applied by means of resistors BE1, RF1, Fig. 4, and current feedback by means of resistors RE2, RF2; a padding resistor RB is utilised to make the input impedance of the amplifier match the impedance of the input cable 25. The phase shift of 90 degrees is introduced by the output transistor 26. In a second embodiment, voltage feedback is produced by means of resistors RE1, RF1, Fig. 5 a D.C. blocking capacitor being placed in series with resistor RF1. Current feedback is introduced by resistors R1, RE2, RF2, resistor RE2 being in parallel with resistor R, via a D.C. blocking capacitor. The input and output are via transformers 41, 42 respectively. A pushpull embodiment is also described in the Specification (Fig. 6, not shown) comprising two such circuits together with phase-splitting input and output transformers.
GB3779772A 1971-08-23 1972-08-14 Amplifier circuits Expired GB1328940A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17389871A 1971-08-23 1971-08-23

Publications (1)

Publication Number Publication Date
GB1328940A true GB1328940A (en) 1973-09-05

Family

ID=22633982

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3779772A Expired GB1328940A (en) 1971-08-23 1972-08-14 Amplifier circuits

Country Status (3)

Country Link
JP (1) JPS4830811A (en)
DE (1) DE2241060B2 (en)
GB (1) GB1328940A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53101252A (en) * 1977-02-16 1978-09-04 Sony Corp Feedback-type amplifier circuit
US4220931A (en) * 1978-05-12 1980-09-02 Northern Telecom Systems Corporation Composite video automatic gain control amplifier
US4179314A (en) * 1978-12-11 1979-12-18 Kawecki Berylco Industries, Inc. Treatment of beryllium-copper alloy and articles made therefrom
US4394185A (en) * 1982-03-30 1983-07-19 Cabot Berylco, Inc. Processing for copper beryllium alloys
US4774478A (en) * 1986-09-19 1988-09-27 Tektronix, Inc. Feedback amplifier compensation circuitry

Also Published As

Publication number Publication date
DE2241060A1 (en) 1973-03-01
JPS4830811A (en) 1973-04-23
DE2241060B2 (en) 1975-11-06

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees