Costas loop carrier wave reproducing circuit

Details Costas loop carrier wave reproducing circuit Costas loop carrier wave reproducing circuit

1991-07-10

1992-02-04

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307529, 328155, 328158, 328160, H03K 522

Patent

active

050862413

ABSTRACT:
A Costas loop carrier wave reproducing circuit includes a first differential amplifier circuit, a second differential amplifier circuit, a multiplying circuit, a first square circuit, a second circuit, and a double-balanced differential amplifier circuit. The first differential amplifier circuit obtains an inphase output from an inphase demodulated signal obtained by performing synchronous detection of a component inphase with a four-phase modulated wave. The second differential amplifier circuit obtains an orthogonal output from an orthogonal demodulated signal obtained by performing synchronous detection of an orthogonal component of the four-phase modulated wave. The multiplying circuit multiplies outputs from the first and second differential amplifier circuits. The first square circuit obtains a square output of an output from the first differential amplifier circuit. The second square circuit obtains a square output of an output from the second differential amplifier circuit. The double-balanced differential amplifier circuit obtains an output difference between the first and second square circuits and outputting a product of the output difference and an output from the multiplying circuit as a PLL control signal.

REFERENCES:
patent: 4353000 (1982-10-01), Noda
patent: 4572975 (1986-02-01), Bowers
patent: 4586155 (1986-04-01), Gilbert
patent: 4694204 (1987-09-01), Nishijima et al.
patent: 4870303 (1989-09-01), McGinn

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