FM quadrature demodulator with distortion compensation

Details FM quadrature demodulator with distortion compensation FM quadrature demodulator with distortion compensation

1985-05-24

1986-10-07

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329137, H03D 300

Patent

active

046161864

ABSTRACT:
A circuit for reducing the distortion in an FM quadrature demodulator. A non-linear circuit stage is connected after the quadrature demodulator, whose characteristic has an inverse curve form like the demodulator characteristic. If the FM quadrature demodulator uses a resonant circuit to generate a frequency-dependent phase shift and has two outputs in phase opposition, the non-linear circuit stage can be formed by two diode branches through which the output currents of the quadrature demodulator flow. The voltage difference at these two diode branches supplies the output signal with the non-linear distortions largely removed.

REFERENCES:
patent: 3204190 (1965-08-01), Broadhead, Jr.
patent: 4152665 (1979-05-01), Cunningham
patent: 4342000 (1982-07-01), Ogita

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