Data frequency modulator with deviation control

Details Data frequency modulator with deviation control Data frequency modulator with deviation control

H - Electricity

04

B

325/58

H04B 1/04 (2006.01) H03C 3/09 (2006.01) H04L 27/20 (2006.01)

Patent

CA 1237477

A DATA FREQUENCY MODULATOR WITH DEVIATION CONTROL Abstract An automatic deviation control circuit for an angle modulated data transmitter is disclosed wherein the deviation level of modulated data output from VCO (300) is controlled by a modulation cancelling deviation error detection feedback loop comprising mixer (600). phase detector (408A), low pass filter (410), and VCO (406). After the modulation is cancelled by said feedback loop from a sample of modulated carrier by a predetermined value of deviation developed by divider (302), residual modulation is detected by phase detector (408A), sampled by S/H (808 and 810) following a predetermined number of like-level data bits, and applied to the modulation path gain of amplifier (802) to increase or decrease the deviation such that the residual modulation is minimized.

486028

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