DC component suppression in zero CF IF systems

Details DC component suppression in zero CF IF systems DC component suppression in zero CF IF systems

1974-11-07

1976-04-27

Zazworsky, John

328165, H04B 112

Patent

active

039538052

ABSTRACT:
Disclosed is a zero center frequency IF system having an all digital complex multiplier in which DC components in the IF signals are removed from an A/D converter output. Any DC level which reaches the input of the A/D converter or any misalignment in the A/D converter causes the digital outputs to contain unequal numbers of positive and negative words. The sign bit of the digital output is coupled to the input of an integrator which generates a DC output proportional to the DC offset in the A/D converter output. The integrator output is substracted from the IF signal coupled to the input of the A/D converter and cancels any DC components present.

REFERENCES:
patent: 3636462 (1972-01-01), Baldauf, Jr.
patent: 3654560 (1972-04-01), Cath et al.

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