AM/FM radio receiver and local oscillator circuit used therein

Details AM/FM radio receiver and local oscillator circuit used therein AM/FM radio receiver and local oscillator circuit used therein

2006-05-12

2009-06-23

Trinh, Sonny (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S255000, C455S260000

Reexamination Certificate

active

07551906

ABSTRACT:
A couple of frequency doubler circuits21and22which multiplys a frequency of a reference oscillation signal outputted from a reference oscillator12is provided, thereby a frequency of a reference oscillation signal, as the greatest common divisor between a frequency (300 KHz) determined by multiplying the frequency (fx=75 KHz) of a crystal oscillator11by four and a frequency (54 KHz) determined by multiplying an assigned frequency per one channel in AM radio broadcasting by a prescribed divide ratio, can be higher than a conventional frequency. This way realizes the decrease of a divide ratio in a programmable counter17, resulting in the reduction of the circuit scale, shortening of the lock-up time, and improvement of the S/N ratio.

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Chinese Office Action dated Mar. 13, 2009.

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