Quadrature FM detector including low reactance phase shifter

Details Quadrature FM detector including low reactance phase shifter Quadrature FM detector including low reactance phase shifter

1978-02-21

1979-03-13

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329137, 329198, H03D 316

Patent

active

041445015

ABSTRACT:
An improved quadrature detector for producing a frequency demodulated signal employing a low reactance phase shifter. A quadrature FM detector demodulates a frequency modulated signal by phase comparison of a signal directly from the limiter with a signal coupled through a multi-mode resonator tank circuit and a 90.degree. phase shift circuit. In the prior art the 90.degree. phase shift circuit includes a series coupled capacitor having a high reactance which tends to attenuate the signal and decrease the low distortion bandwidth. Accordingly in the present invention a coil is connected across the input or output terminals of the multi-mode tank circuit thereby enabling the phase shift circuit to employ a low reactance capacitor yielding an improved signal level and low distortion bandwidth.

REFERENCES:
patent: 3573643 (1971-04-01), Livenick
patent: 3648184 (1972-03-01), Fujishima et al.
O'Neil, Jr., "FM Demodulator Using Three Pin Two-Pole Monolithic Crystal and CA 3089 Quadrature Detector", RCA Technical Notes, No. 1155, Jun. 8, 1976, pp. 1-2.

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