GB1458933A - Signal detector arrangement - Google Patents

Signal detector arrangement

Info

Publication number
GB1458933A
GB1458933A GB1509075A GB1509075A GB1458933A GB 1458933 A GB1458933 A GB 1458933A GB 1509075 A GB1509075 A GB 1509075A GB 1509075 A GB1509075 A GB 1509075A GB 1458933 A GB1458933 A GB 1458933A
Authority
GB
United Kingdom
Prior art keywords
detector
transistor
diode
bias level
causes
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
GB1509075A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co 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 Marconi Co Ltd filed Critical Marconi Co Ltd
Publication of GB1458933A publication Critical patent/GB1458933A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/08—Demodulation of amplitude-modulated oscillations by means of non-linear two-pole elements
    • H03D1/10—Demodulation of amplitude-modulated oscillations by means of non-linear two-pole elements of diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/22—Homodyne or synchrodyne circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)

Abstract

1458933 Transistor and diode detector circuits MARCONI CO Ltd 11 April 1975 [30 May 1974] 15090/75 Heading H3T A signal detector is selectively operative by a first bias level at 12 which causes a diode 6 to be non-conductive, an emitter follower transistor 1 to function as a linear amplifier and a product detector 13 connected to the output of the transistor 1 to be operative in response to the simultaneous presence of the first bias level and of a signal representative of an injected carrier at 19 and by a second bias level at 12 which renders the product detector 13 inoperative and causes the diode 6 and the baseemitter of 1 to function as a voltage-doubling amplitude modulation detector. The first and second bias levels at 12 are described as +5V and zero to selectively enable detection of suppressed carrier forms of modulation such as SSB and amplitude modulation respectively. An AND gate 18 enables the simultaneous presence of the + 5V at 12 and the signal representative of an injected carrier at 19 to operate the product detector transistor 13.
GB1509075A 1974-05-30 1975-04-11 Signal detector arrangement Expired GB1458933A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU771674 1974-05-30

Publications (1)

Publication Number Publication Date
GB1458933A true GB1458933A (en) 1976-12-15

Family

ID=3698390

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1509075A Expired GB1458933A (en) 1974-05-30 1975-04-11 Signal detector arrangement

Country Status (1)

Country Link
GB (1) GB1458933A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259782A (en) * 1991-09-19 1993-03-24 Nokia Mobile Phones Ltd Detecting RF signals

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259782A (en) * 1991-09-19 1993-03-24 Nokia Mobile Phones Ltd Detecting RF signals
US5404585A (en) * 1991-09-19 1995-04-04 Nokia Mobile Phones Ltd. Power detector that employs a feedback circuit to enable class B operation of a detector transistor
GB2259782B (en) * 1991-09-19 1996-04-10 Nokia Mobile Phones Ltd Power detector

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee