The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 2007
Filed:
Jan. 13, 2005
Matthew Russell Greene, Crystal Lake, IL (US);
Matthew Russell Greene, Crystal Lake, IL (US);
Amptech Incorporated, Westlake Village, CA (US);
Abstract
An electronic circuit contains a controller integrated circuit and a power amplifier MMIC connected to the controller IC. The power amplifier MMIC contains a radio frequency power amplifier. The RF power amplifier is a double heterojunction bipolar transistor. The controller IC has an operational amplifier that supplies a DC bias to the base of the RF power amplifier through a ballast resistor. The operational amplifier has an output slope that compensates either partially or entirely for the voltage drop across the ballast resistor. A reference circuit in the power amplifier is disposed close enough to the power amplifier to mirror fluctuations in the base-emitter voltage caused by temperature fluctuations.