FM quadrature detector with ferrite bead tuned circuit

Details FM quadrature detector with ferrite bead tuned circuit FM quadrature detector with ferrite bead tuned circuit

1983-12-07

1986-08-26

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 329116, 329137, 329140, 329145, 329160, 333175, 333185, H03D 300, H03D 326

Patent

active

046085386

ABSTRACT:
A quadrature detector circuit for demodulating frequency modulated information is provided that is particularly designed for use in television receive only (TVRO) satellite communication video receivers. The bandwidth restrictions of conventional quadrature detector circuits are eliminated by substituting a simple ferrite bead for the usual parallel capacitor, inductor, resistor combination heretofore required in quadrature detectors. The quadrature detector hereof produces a higher level of video output, improved linearity, and better selectivity, as compared to conventional quadrature detector circuits. Moreover, the quadrature detector hereof reduces circuit complexity, and decreases material costs and production time.

REFERENCES:
patent: 3051891 (1962-08-01), Jorgensen
patent: 3699272 (1972-10-01), Fritz
patent: 4232268 (1980-11-01), Hinn
patent: 4255728 (1981-03-01), Doty
patent: 4375618 (1983-03-01), Jett
FM Stereo/Quad Receiver Servicing Manual, .COPYRGT.1974, Carr, pp. 51-52.
Radio Handbook, 22nd Edition, Orr, 1981, p. 13.17.
Advanced Electronic Troubleshooting, D. Cameron, .COPYRGT.1977, p. 63.
"IF Amplifier and Quadrature Detector", MC 1357 Integrated Circuit Data Sheet, pp. 5-73-5-78.

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