Quadrature modulator having compensation for local oscillator le

Details Quadrature modulator having compensation for local oscillator le Quadrature modulator having compensation for local oscillator le

1990-04-10

1991-04-30

Grimm, Siefried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332123, 332162, 375 39, 375 57, 375 58, 455 63, H04L 2736

Patent

active

050122088

ABSTRACT:
The invention relates to a quadrature modulator comprising a circuit for the compensation of a local oscillator leak signal in an output signal of the modulator, which circuit adds different compensation voltages to two modulation signals. To provide an automatic compensation of the local oscillator leak signal, the quadrature modulator of the invention comprises a regulating circuit for the regulation of the intensity of the compensation voltages irrespective of each other on the basis of the correlation between the amplitude variation in the output signal and the corresponding modulation signal.

REFERENCES:
patent: 3500250 (1970-03-01), Frerking
patent: 4105977 (1978-08-01), Fitting et al.
patent: 4243955 (1981-01-01), Daniel et al.

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