Arrangement for eliminating offset errors in a power control cir

Details Arrangement for eliminating offset errors in a power control cir Arrangement for eliminating offset errors in a power control cir

1993-03-12

1994-04-19

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330280, 330281, 455126, H03G 330

Patent

active

053049470

ABSTRACT:
A high frequency power amplifier amplifies periodic signals in the form of HF bursts. The power output of the amplifier is adjusted by a control loop which produces a control signal in response to a comparison made between a set-point value (BV) and the actual power output (Put) of the amplifier and applies the signal to the power amplifier. The control loop includes a differential amplifier. A correction circuit measures the output voltage of the differential amplifier over a time period (t.sub.1 to t.sub.2) prior to each HF burst and stores in a memory (C) a magnitude proportional to this output voltage. During the following HF burst, this magnitude is used to introduce into the control loop a correction magnitude (Ukorr) for correction of offset voltages (Uoff) occurring in the control loop.

REFERENCES:
patent: 4523155 (1985-06-01), Walczak et al.
patent: 5196806 (1993-03-01), Ichihara

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