FM demodulator including injection locked oscillator/divider

Details FM demodulator including injection locked oscillator/divider FM demodulator including injection locked oscillator/divider

1989-01-25

1990-08-28

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 23, 3581911, 455216, H04N 544

Patent

active

049530100

ABSTRACT:
An FM demodulator comprises an injection locked oscillator/divider for receiving an input signal to be demodulated. The injection locked oscillator/divider is coupled via a divider to a frequency discriminator, such as a quadrature demodulator, for providing a demodulated output signal. A feedback loop is provided to afford the demodulated output signal to a varactor tuning circuit of the injection locked oscillator/divider so that the center frequency of the injection locked oscillator/divider is constrained to correspond with the frequency of the input signal. The FM demodulator provides improved threshold extension and demodulated video bandwidth.

REFERENCES:
patent: 3334301 (1967-08-01), Sarkany
patent: 4531148 (1985-07-01), Ohta
patent: 4608539 (1986-08-01), Lawton
patent: 4766391 (1988-08-01), McGinn
patent: 4806872 (1989-02-01), Cowley

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