FM Demodulator PLL with compensation for nonlinear varactor char

Details FM Demodulator PLL with compensation for nonlinear varactor char FM Demodulator PLL with compensation for nonlinear varactor char

1984-02-14

1986-01-14

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 331 17, 331 36C, 455214, H03D 318, H03D 300, H03L 706, H04B 116

Patent

active

045648158

ABSTRACT:
There is provided an improvement of an FM demodulator of the PLL system including a VCO, a phase comparator and a low-pass filter, whereby the distortion components of the FM demodulated signal to be caused due to nonlinearity of the frequency vs. control voltage characteristic of the VCO are eliminated. This improved FM demodulator of the PLL system includes a circuit for making the harmonic distortion components from the output signal of the low-pass filter and synthesizing them with the output signal of the low-pass filter so as to obtain the non-distorted FM demodulated signal.

REFERENCES:
patent: 3641463 (1972-02-01), Perks
patent: 4129832 (1978-12-01), Neal et al.
patent: 4468638 (1984-08-01), Kyriakos
Rippy, R. "Feedback in Phase-Locked Loop Linearizes Phase Demodulator", Electronics, vol. 48, No. 25, pp. 104-105, Dec. 11, 1975.

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