Self-adjusting I-Q modulator system

Details Self-adjusting I-Q modulator system Self-adjusting I-Q modulator system

2005-08-16

2005-08-16

Kinkead, Arnold (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

Including stabilization or alternatively distortion, noise...

C342S174000, C342S357490, C375S296000, C375S308000, C332S145000, C332S103000

Reexamination Certificate

active

06930563

ABSTRACT:
An improved self-adjusting I-Q modulator system has a quadrature modulated carrier output that is input to a waveform acquisition circuit for obtaining a full waveform from which both amplitude and phase measurements are obtained. Calibration occurs by setting respective I and Q inputs to the multipliers to zero and adjusting corresponding variable offset voltages to null the modulated carrier output. Then a voltage reference is selected by each I and Q input path in turn, and the amplitude and phase of the modulated carrier output for each I and Q channel are measured. Respective phase shifters for a carrier signal are adjusted to move the outputs of the phase shifters toward a quadrature relationship in response to the measured amplitude and phase of the full waveform. These steps are repeated until the phases of the I and Q channels are in quadrature.

REFERENCES:
patent: 4717894 (1988-01-01), Edwards et al.
patent: 5119399 (1992-06-01), Santos et al.
patent: 5694093 (1997-12-01), DaSilva et al.
patent: 6574286 (2003-06-01), McVey

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