Current comparator automatic output control

Details Current comparator automatic output control Current comparator automatic output control

1995-09-11

1997-07-29

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330139, 330140, 455126, H03G 330

Patent

active

056525478

ABSTRACT:
A circuit for controlling the output level of a power amplifier is disclosed. A current comparator (230) compares a reference current with a sensed current which is representative of the power amplifier current state. The reference current is used not only for comparison with the sensed current but also for setting the power amplifier (104). The current comparator (230) provides an output, based on the comparison, that is coupled to the power amplifier so that the power amplifier current is maintained at an optimum level for minimizing temperature dependent variations and substantially leveling the power of the power amplifier.

REFERENCES:
patent: 3449680 (1969-06-01), Schilb et al.
patent: 4234853 (1980-11-01), Yamaguchi
patent: 4307348 (1981-12-01), Nicholson
patent: 4456889 (1984-06-01), Kumar
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4602218 (1986-07-01), Vilmur et al.
patent: 5381115 (1995-01-01), Timmons et al.
The Norton Amplifier LM3900 taken from the National Semiconductor Corp Linear Applications Handbook (1986) Application No. 72 by T.M. Frederiksen .

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