Automatic control circuitry for a signal power amplifier

Details Automatic control circuitry for a signal power amplifier Automatic control circuitry for a signal power amplifier

1987-02-27

1988-06-28

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including gain control means

330130, 330141, H03G 320

Patent

active

047542314

ABSTRACT:
The present invention is directed to an automatic power control circuit for a signal power amplifier which maintains the output power to one of a plurality of output power levels. The output power level is controlled by an externally-generally level control signal which is used by a square wave signal generating circuitry for controlling the duty cycle of the generated square wave. The square wave is integrated by a filter network to produce a reference voltage level. The output voltage level of the RF amplifier is compared with the reference voltage level, and the difference between the two signals is used to control a drive circuit for generating the proper control voltage for controlling the RF amplifier so that the desired output power level is maintained.

REFERENCES:
patent: 4563775 (1986-01-01), Yokosuka
patent: 4570127 (1986-02-01), Tanimoto et al.

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