Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-06-15
1981-06-02
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455183, 331 1A, 331 18, H04B 116, H03L 718
Patent
active
042715318
ABSTRACT:
In a frequency synthesizer with phase-locked loop in which the output signal from a voltage controlled oscillator is frequency-divided by a variable frequency dividing circuit and the frequency-divided one, together with a reference frequency signal, is applied to a phase comparator and the output signal from the phase comparator is fed back to the voltage control oscillator, the variable frequency dividing circuit is comprised of a first variable frequency divider for frequency-dividing the frequency of the output signal from the voltage controlled oscillator into a 1/K frequency, a second variable frequency divider for frequency-dividing the frequency of the output signal from the first variable frequency divider into a 1/m frequency, and a rate multiplier which receives the output signal from the second variable frequency divider to produce Q pulses (Q is an integer between 0 to P-1 where P is an integer) when receiving P input pulses, and to change the frequency dividing ratio K of the first variable frequency divider.
REFERENCES:
patent: 3949304 (1976-04-01), McClaskey
patent: 4024476 (1977-05-01), Briggs
patent: 4121162 (1978-10-01), Alberkrack et al.
patent: 4123724 (1978-10-01), Das et al.
Japanese Pat. No. 28737/78, "A Variable Frequency Divider".
Japanese Pat. No. 136272/76, "A Frequency Synthesizer".
Japanese Pat. No. 5954/78, "Oscillator".
Shima Takeshi
Torii Ken-ichi
Ng Jin F.
Tokyo Shibaura Denki Kabushiki Kaisha
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