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Title: Radio receiver with a phase locked loop for a demodulator

Abstract: A radio receiver with a phase-locked loop demodulator is described. The phase-locked loop includes a phase comparator, a variable frequency (voltage-controlled) oscillator, and a low pass filter. The capture range and lock range of the phase-locked loop are controlled in response to the tuning of the loop. In an AM receiver with a phase-locked loop the variable frequency oscillator of the loop supplies a reference carrier for a synchronous detector which is phase-locked to a modulated carrier. A band pass filter eliminates undesired modulation of the variable frequency oscillator by an undesired received signal.


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Other info:


Inventors: Shimizu, Ikuo (Tokyo, JA)
Toyoshima, Masakatsu (Tokyo, JA)

Application Number: 503100
Filing Date: 1974-09-04
Publication_date: 1976-02-17
Assignee: Sony Corporation (Tokyo, JA)
Primary Class(es): 455/265 455/337
Other Classes:
US Patent Ref:
3069625Dec, 1962Morita et al.325/346.
3209271Sep, 1965Smith329/122.
3231822Jan, 1966Tillotson325/346.

Other Refs:
Primary Examiner: Safourek, Benedict V.
Assistant Examiner:
Attorney: Eslinger; Lewis H., Sinderbrand; Alvin