US Patent 7148748 Active protection circuit for load mismatched power amplifier

Patent 7148748 was granted and assigned to TriQuint Semiconductor on December, 2006 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

TriQuint Semiconductor

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

71487480

Patent Inventor Names

Thomas R. Apel0

Date of Patent

December 12, 2006

Patent Application Number

108841350

Date Filed

July 2, 2004

Patent Primary Examiner

‌

Quan Tra

Patent abstract

A peak detector detects an amplifier output overvoltage condition if the amplifier drives a mismatched load impedance. In response to the detected overvoltage condition, a clamping transistor lowers a reference DC bias voltage supplied by a bias circuit to the amplifier. The lowered reference DC bias voltage lowers amplifier gain and output power, thus protecting the amplifier.