FM demodulator using injection locked oscillator having tuning f

Details FM demodulator using injection locked oscillator having tuning f FM demodulator using injection locked oscillator having tuning f

1996-06-10

1997-07-22

Mis, David

Demodulators

Frequency modulation demodulator

Input signal combined with local oscillator or carrier...

329326, 331 23, H03D 300, H03L 7083, H03L 7093

Patent

active

056507496

ABSTRACT:
A demodulator circuit (100) and method for producing a demodulated signal V.sub.OUT from an input signal V.sub.IN. A frequency detection circuit (101) produces a quadrature signal V.sub.QUAD which is compared to the input signal V.sub.IN to produce a detected output signal. The phase and frequency of the quadrature signal V.sub.QUAD are responsive to a control signal I.sub.CONTROL. The demodulator circuit (100) has an output terminal (114) which provides the demodulated signal V.sub.OUT. Nonlinearity in the demodulated output signal V.sub.OUT in relation to a modulating signal is reduced by a linearizing feedback circuit (102). Automatic tuning is provided by a tuning feedback circuit (103). The output signals produced at the respective output terminals (114) and (113) of the linearizing feedback circuit (102) and tuning feedback circuit (103) are summed to produce the control current I.sub.CONTROL.

REFERENCES:
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patent: 4953010 (1990-08-01), Cowley
V. Uzunoglu et al., IEEE Transactions on Circuits and Systems, "Synchronous and the Coherent Phase-Locked Synchronous Oscillators: New Techniques in Synchronization and Tracking", vol. 36, No. 7, Jul. 1989, pp. 997-1004.

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