Polar loop transmitter

Details Polar loop transmitter Polar loop transmitter

H - Electricity

04

B

325/67

H04B 1/04 (2006.01) H03C 1/06 (2006.01)

Patent

CA 1235190

14 ABSTRACT: A polar loop transmitter in which a negative feedback bias adjusting system (76,78,80) is provided to control the bias voltage applied to a differential ampli- fier (30) which supplies the input envelope information to an amplitude modulator (36), so that the R.F. modulated output goes to zero for a zero in the input envelope information. The negative feedback bias adjusting system (76,78,80) comprises a threshold circuit (76) for deriving a threshold voltage from the D.C. component in the output of the differential amplifier (30). This enables negative going spikes to be separated from the output waveform and their amplitude used to control the D.C. correction com- ponent which is applied to an input of the differential amplifier.

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