Self-synchronization circuit for a ffsk and msk demodulator

Details Self-synchronization circuit for a ffsk and msk demodulator Self-synchronization circuit for a ffsk and msk demodulator

H - Electricity

04

B

325/35

H04B 7/00 (2006.01) H03L 7/113 (2006.01) H04L 27/227 (2006.01) H04L 27/00 (2006.01) H04L 27/18 (2006.01)

Patent

CA 1171138

TITLE SELF-SYNCHRONIZATION CIRCUIT FOR A FFSK OR MSK DEMODULATOR INVENTORS Rudi de Buda Charles E. Jagger ABSTRACT OF THE DISCLOSURE The self-synchronization circuit splits the incoming sig- nal into two circuit paths where the signals are frequency shifted by a frequency signal equal to the carrier frequency so as to pro- vide an in-phase signal in one circuit path and a quadrature signal in the other circuit path. The frequency shifting circuit includes at least a controllable oscillator. The output of a first multi- plier which multiplies the in-phase and quadrature signals, is fed to a clock recovery circuit which determines the clock frequency. A second multlplier multiplies the output of the first multiplier with the clock recovery circuit output to provide a signal which controls the controllable oscillator. In addition, a frequency discriminator utilizes the in-phase and quadrature signals to ini- tially coarse control the controllable oscillator frequency. The frequency shifting signals may be obtained from the controllable oscillator feeding phase shifting circuits, or they may be obtained from a combined circuit including a fixed oscillator with phase shifting circuits together with the controllable oscillator and appropriate mixing circuits.

394946

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