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GB534457A - Improvements in and relating to detector coupling circuits - Google Patents

Improvements in and relating to detector coupling circuits

Info

Publication number
GB534457A
GB534457A GB16803/39A GB1680339A GB534457A GB 534457 A GB534457 A GB 534457A GB 16803/39 A GB16803/39 A GB 16803/39A GB 1680339 A GB1680339 A GB 1680339A GB 534457 A GB534457 A GB 534457A
Authority
GB
United Kingdom
Prior art keywords
amplifier
earth
bias
amplitude
relating
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
GB16803/39A
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.)
Philco Radio and Television Corp
Original Assignee
Philco Radio and Television 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 Philco Radio and Television Corp filed Critical Philco Radio and Television Corp
Priority to GB16803/39A priority Critical patent/GB534457A/en
Priority to US338201A priority patent/US2302520A/en
Publication of GB534457A publication Critical patent/GB534457A/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
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/04—Limiting level dependent on strength of signal; Limiting level dependent on strength of carrier on which signal is modulated

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

534,457. Valve circuits for wireless reception. THORNTON, A. A. (Philco Radio & Television Corporation). June 8, 1939, No. 16803. [Class 40 (v)] In a direct coupled detector-amplifier circuit particularly for television receivers, the maximum amplitude of the detected signals is made approximately equal to the cut-off bias of the first L.F. amplifier so as to reduce the effect of noise above this amplitude. The intermediate frequency input, subject to A.G.C., is applied between earth and the cathode of a diode V<SP>1</SP> while the load comprising condenser 4, resistance 5 and a small reactance 17 is connected between earth and the 'anode. The detected output is applied directly through a peaking coil 18 to the grid of a L.F. amplifier V<SP>2</SP> having a sharp cut-off, which is adjusted to equal the controlled maximum input, by means of a bias battery 13. Synchronizing signals are taken from screen grid of V2 in the manner described in Specification 530,319.
GB16803/39A 1939-06-08 1939-06-08 Improvements in and relating to detector coupling circuits Expired GB534457A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB16803/39A GB534457A (en) 1939-06-08 1939-06-08 Improvements in and relating to detector coupling circuits
US338201A US2302520A (en) 1939-06-08 1940-05-31 Detector coupling circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16803/39A GB534457A (en) 1939-06-08 1939-06-08 Improvements in and relating to detector coupling circuits

Publications (1)

Publication Number Publication Date
GB534457A true GB534457A (en) 1941-03-07

Family

ID=10083934

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16803/39A Expired GB534457A (en) 1939-06-08 1939-06-08 Improvements in and relating to detector coupling circuits

Country Status (2)

Country Link
US (1) US2302520A (en)
GB (1) GB534457A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2480511A (en) * 1944-09-29 1949-08-30 Rca Corp Scanning circuit
US2829197A (en) * 1951-02-16 1958-04-01 Avco Mfg Corp Noise limiter for television receiver
US2907822A (en) * 1952-04-17 1959-10-06 Marconi Wireless Telegraph Co Interference reduction in television and other communication systems
DE1161948B (en) * 1952-12-22 1964-01-30 Loewe Opta Ag Amplifier circuit for picture voltages
US2978539A (en) * 1954-12-16 1961-04-04 Pye Ltd Interference limiters
DE1020670B (en) * 1956-08-24 1957-12-12 Philips Patentverwaltung Video demodulator
US3340357A (en) * 1961-05-17 1967-09-05 Motorola Inc Television video detector circuit comprising variable load means for controlling frequency response
US3535444A (en) * 1968-05-13 1970-10-20 Rca Corp Noise immune video circuits
US3781698A (en) * 1972-05-30 1973-12-25 Gen Electric Voltage ratio discriminator
US4639785A (en) * 1984-03-26 1987-01-27 Rca Corporation Non-saturating video output amplifier

Also Published As

Publication number Publication date
US2302520A (en) 1942-11-17

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