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:
Jul. 29, 2014
Filed:
Jan. 25, 2013
Universal Scientific Industrial (Shanghai) Co., Ltd., Shanghai, CN;
Universal Global Scientific Industrial Co., Ltd., Nantou County, TW;
Jaw-Ming Ding, Taoyuan County, TW;
Wei-Hsuan Lee, New Taipei, 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 power amplifier includes an output stage circuit, an exponential type bias circuit and a voltage-current transformation circuit. The output stage circuit receives a first system voltage and outputs an output current. The exponential type bias circuit receives a bias current, wherein a relationship between the bias current and output current is exponential, and when the bias current is zero current, and the output current is zero current. The voltage-current transformation circuit transforms the first system voltage into a second current so that the bias current is in proportion to the first system voltage, and thus the relationship between the output current and the first system voltage is exponential. The bias current is equal to times of the sum of the first current and the second current.