Fixed compromise equalization for a dual port FM modulator

Details Fixed compromise equalization for a dual port FM modulator Fixed compromise equalization for a dual port FM modulator

1995-04-18

1996-05-07

Grimm, Siegfried H.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

332128, 455 43, 455110, 455 63, H03C 308

Patent

active

055150136

ABSTRACT:
A dual port frequency modulator and method for eliminating the undesired affects caused by high port/low port phase differences in a standard dual port frequency modulator. The frequency modulator includes an inverse filter stage coupled to the input of a modulator stage including a first high port processing path for processing high frequency components of a modulation signal and a second low port processing path for processing low frequency components of a modulation signal. The outputs of the high and low paths are coupled to separate ports of a voltage controlled oscillator. The impulse response of the inverse filter is designed to be the inverse of the impulse response of the modulator stage. The filter functions to counter-act the adverse effects caused by the delay difference in the high and low processing paths of the modulator stage such that the overall response of the dual port frequency modulator is significantly improved.

REFERENCES:
patent: 3628134 (1971-12-01), Anderson
patent: 4743867 (1988-05-01), Smith

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