Carrier-recovery circuit

Details Carrier-recovery circuit Carrier-recovery circuit

1982-12-27

1984-10-02

Ng, Jin F.

Pulse or digital communications

Repeaters

Testing

375 83, 375 97, 375120, 329 50, 329124, H03D 324, H04L 2722

Patent

active

044752180

ABSTRACT:
In the base-band carrier-recovery circuit used in the demodulator of radio equipment using a PSK modulated signal, a first doubled signal (sin 2.theta.) is obtained by using first and second outputs (sin .theta., cos .theta.) in-phase quadrature with each other from an in-phase quadrature detecting means. A second doubled signal (cos 2.theta.) having a phase difference of 90 degrees from the first doubled signal (sin 2.theta.) is obtained by fullwave rectifying the second output (cos .theta.) and transforming the output waveform. Thereafter a quadrupled signal (sin 4.theta.) is generated from the first and second doubled signals. The quadrupled signal is then fed back to a VCO via a loop filter, thereby recovering the reference carrier signal which is in phase with the received PSK modulated signal.

REFERENCES:
patent: 4100499 (1978-07-01), Monrolin
patent: 4143322 (1979-03-01), Shimamura
patent: 4338574 (1982-07-01), Fujita et al.
patent: 4344178 (1982-08-01), Waters

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