Differential radio frequency detector/comparator for power level

Details Differential radio frequency detector/comparator for power level Differential radio frequency detector/comparator for power level

1993-03-12

1994-08-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330280, H03G 330

Patent

active

053370201

ABSTRACT:
An automatic level control circuit for radio frequency power amplifiers which is immune to temperature and power supply induced variations. The level control circuit (42) employs a detector/comparator comprising a matched transistor pair (55) operating as a detecting differential amplifier to compare a reference signal (63) to the output power signal (83). A second amplifier (60) receives the differential output signals from the detecting amplifier and provides a power level control signal (97) to the power amplifier, thereby causing the power amplifier to produce the desired output power level.

REFERENCES:
patent: 4724337 (1988-02-01), Maeda et al.

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