Quadratore demodulator circuit utilizing automatic frequency con

Details Quadratore demodulator circuit utilizing automatic frequency con Quadratore demodulator circuit utilizing automatic frequency con

1992-09-30

1994-08-23

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

329309, 375 39, 375 81, 375 82, H03D 300

Patent

active

053411056

ABSTRACT:
A circuit for regenerating a carrier, through coherent detection and demodulation of a quadrature modulated wave, is controlled by an improved AFC control to prevent possible false pull-in. The carrier regeneration circuit includes detector 1, a first multi-level code discriminator 2, a phase deviation detection circuit 3 and a voltage control oscillator 5. It further comprises a second multi-level code discriminator 6 for multi-level code discriminating two output signal pairs of quadrature detector 1 at the time of data conversion, a correlation circuit 7 for taking the correlation between the output signals of first multi-level code discriminator 2 and the outputs signals of second multi-level code discriminator 6, a determination circuit 8 for determining that the two demodulated main signals of quadrature detector 1 vary at the same time and that the output levels of second multi-level code discriminator 6 become higher than a predetermined threshold value, and a switch circuit 9 for adding the output of correlation circuit 7 to the output of phase deviation detection circuit 3 in accordance with the output of determination circuit 8.

REFERENCES:
patent: 4100503 (1978-07-01), Lindsey et al.
patent: 5005186 (1991-04-01), Aono et al.

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