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:
Nov. 04, 2014
Filed:
Mar. 11, 2013
Universal Scientific Industrial (Shanghai) Co., Ltd., Shanghai, CN;
Universal Global Scientific Industrial Co., Ltd., Nantou County, TW;
Universal Scientific Industrial (Shanghai) Co., Ltd., Shanghai, CN;
Universal Global Scientific Industrial Co., Ltd., Nantou County, TW;
Abstract
A radio frequency (RF) power amplifier is disclosed. The RF power amplifier includes an adder circuit, an output-stage circuit and a differential circuit. The adder circuit has a first ratio and a second ratio, and receives a reference voltage and a feedback voltage so as to output an adder voltage after an operation, wherein the feedback voltage is a voltage with a negative temperature coefficient, and the reference voltage is sum of a first voltage with a negative temperature coefficient and a second voltage with positive temperature coefficient. The output-stage circuit is used for providing the feedback voltage. The differential circuit has a first multiplier factor, and the differential circuit makes the first multiplier factor be multiplied with the adder voltage so as to provide a voltage to the output-stage circuit. The RF power amplifier stabilizes an output current through adjusting the temperature coefficient of the reference voltage.