| 摘要 |
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.
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