Output overvoltage protection circuit for power amplifier

Details Output overvoltage protection circuit for power amplifier Output overvoltage protection circuit for power amplifier

2006-12-05

2006-12-05

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including protection means

Reexamination Certificate

active

07145397

ABSTRACT:
Disclosed is an output overvoltage protection circuit for a power amplifier having a plurality of stages, which comprises a monitor circuit for monitoring an output overvoltage of an output transistor in the final stage of the power amplifier and allowing a current to flow therethrough in response to the monitored output overvoltage, and a current mirror circuit for supplying a current proportional to the current from the monitor circuit in such a manner that the base bias of the first-stage transistor of the power amplifier is reduced in response to the current supplied from the current mirror circuit, to reduce the output of the final-stage output transistor.

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