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95. PLL circuit in the modem do?

In Electronic Infomation Category: 9 | on November 23,2011

PLL circuit in the modems role is as follows:

(1) phase-locked loop circuit for FM. Modulation control of the carrier signal frequency, called frequency modulation, referred to as FM. FM VCO circuit can be used, but it has the oscillation frequency stability is not high, the control of the shortcomings of poor linearity. Using PLL, the crystal oscillator circuit output voltage as the PLL input signal, making the PLL VCO center frequency cuo quartz crystal oscillator circuit is equal to the oscillation frequency is called, resulting in improved stability.

(2) phase-locked loop for demodulation circuit. The use of low-pass filter, the modulated carrier wave component in the filtered, modulated signal can be restored. Contribute both for the FM wave demodulation circuit, the VCO output and 95 datasheet and input using the same regular FM wave modulated by a low pass filter produces the output demodulated signal; wave for AM synchronous detection circuit, VCO output and 95 price and input signal carrier frequency component of the same, there is no fixed phase shift of the output signal phase by phase shift circuit, analog multiplier detector, and 95 suppliers and then low-pass filter can be demodulated signal.

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