GB996976A - Improvements in or relating to electrical signal limiting and amplifying circuits - Google Patents

Improvements in or relating to electrical signal limiting and amplifying circuits

Info

Publication number
GB996976A
GB996976A GB2879961A GB2879961A GB996976A GB 996976 A GB996976 A GB 996976A GB 2879961 A GB2879961 A GB 2879961A GB 2879961 A GB2879961 A GB 2879961A GB 996976 A GB996976 A GB 996976A
Authority
GB
United Kingdom
Prior art keywords
input
amplifier
diode
bridge
transistor
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
GB2879961A
Inventor
Adrian Percy Clark
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.)
British Telecommunications PLC
British Telecommunications Research Ltd
Original Assignee
British Telecommunications PLC
British Telecommunications Research Ltd
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 British Telecommunications PLC, British Telecommunications Research Ltd filed Critical British Telecommunications PLC
Priority to GB2879961A priority Critical patent/GB996976A/en
Publication of GB996976A publication Critical patent/GB996976A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

996,976. Transistor limiting circuits. BRITISH TELECOMMUNICATIONS RESEARCH Ltd. Aug. 9, 1962 [Aug. 9, 19611, No. 28799/61. Heading H3T. A limitor comprises a transistor amplifier with a diode bridge circuit connected in its input, the input impedance of the amplifier being such that the signal at the amplifier input is small compared with the input to the bridge. As described, the circuit comprises a first section consisting of a diode bridge D1 . . . D4 and transistors T1, T2 and a second section consisting of diode bridge D7 . . . D10 and transistors T3, T4. After an initial limiting by bridge D1 . . . D4 input signals applied at J are limited in amplifier T1, T2 by means of switched negative feedback paths in which diodes D5 or D6 conduct, depending on the polarity of the input, to apply negative feedback and thus reduce the input impedance of the amplifier. In the second section, the input impedance of amplifier T3, T4 is varied by a shunt diode D11, so arranged that the input impedance is a maximum when the transistor T3 is just cut off and decreases when either diode D11 or the base-emitter junction of T3 is forward biased. The section provides two antiphase outputs L, M clamped by diodes D12, D13.
GB2879961A 1961-08-09 1961-08-09 Improvements in or relating to electrical signal limiting and amplifying circuits Expired GB996976A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2879961A GB996976A (en) 1961-08-09 1961-08-09 Improvements in or relating to electrical signal limiting and amplifying circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2879961A GB996976A (en) 1961-08-09 1961-08-09 Improvements in or relating to electrical signal limiting and amplifying circuits

Publications (1)

Publication Number Publication Date
GB996976A true GB996976A (en) 1965-06-30

Family

ID=10281366

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2879961A Expired GB996976A (en) 1961-08-09 1961-08-09 Improvements in or relating to electrical signal limiting and amplifying circuits

Country Status (1)

Country Link
GB (1) GB996976A (en)

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