Polar loop transmitter

Details Polar loop transmitter Polar loop transmitter

1983-02-22

1984-11-06

Bookbinder, Marc E.

Telecommunications

Transmitter

Amplitude modulation

332 37D, 455126, H04B 104

Patent

active

044816723

ABSTRACT:
A polar loop transmitter in which a negative feedback bias adjusting system is provided to control the bias voltage applied to a differential amplifier which supplies the input envelope information to an amplitude modulator, so that the R.F. modulated output goes to zero for a zero in the input.
The envelope information negative feedback bias adjusting system modifies a predetermined bias voltage supplied by a potentiometer by sampling and holding the peak value of negative spikes occurring in the output of the differential amplifier and using the held value as a negative feedback voltage to the differential amplifier.

REFERENCES:
patent: 3200336 (1965-08-01), Valakos
patent: 3434069 (1969-03-01), Jones
patent: 3486128 (1969-12-01), Lohrmann
patent: 3662290 (1972-05-01), Elliott
patent: 3891926 (1975-06-01), Ishman et al.
patent: 4237555 (1980-12-01), Dishal

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