FM demodulator

Details FM demodulator FM demodulator

1991-10-24

1992-09-15

Mis, David

Demodulators

Frequency modulation demodulator

Input signal converted to and processed in pulse form

329342, 329343, H03D 300

Patent

active

051481146

ABSTRACT:
For an integratable FM demodulator which has an optimal noise behavior and does not require any balancing, the demodulator includes a marker pulse generator (2) having an integrator (22) which is succeeded by a comparator (23), while at the start of each positive and/or negative edge of the limited FM signal, a marker pulse is started and one of a first and second reference signals is applied to the integrator input until a predetermined edge of the reference clock signal appears, and the first and a second reference signals are subsequently applied alternately to the integrator input in dependence upon a reference clock signal applied to the marker pulse generator, the two reference signals being applied to the integrator input during the desired period of time of the marker pulse, each time during equal overall time intervals, and a comparison voltage occurring at the integrator output at the end of the desired period of time, which comparison voltage is detected by the comparator (23), whereupon the started marker pulse is ended.

REFERENCES:
patent: 4656431 (1987-04-01), Chapman

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