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:
Oct. 29, 2002
Filed:
Nov. 10, 1999
Chung Hwan Kim, Taejon, KR;
Cheon Soo Kim, Taejon, KR;
Hyun Kyu Yu, Taejon, KR;
Min Park, Taejon, KR;
Dae Yong Kim, Taejon, KR;
Abstract
The RF active balun circuit for improving a small-signal linearity in a power amplifying circuit of a CDMA system is provided under the construction of a signal amplifier driven by exterior individual direct current gate power VGG VGG for receiving a communication input signal AC-In and performing a cascode amplification at a normal operation point where a feedback third-order distortion signal becomes large; a distortion signal generator driven by exterior direct current gate power VGG different from the above power, for generating the communication input signal AC-In as the third-order distortion signal by nonlinearity of an active element to cancel the third-order distortion signal amplified in the signal amplifier; and an insulator provided for an insulation from a exterior driving power VGG applied to the distortion signal generator, thereby maintaining the small size, lower power and high efficient terminal characteristics by using a gain based on gate voltage of FET and the nonlinearity characteristic difference, and improving the linearity of an IC operating by a small signal or medium signal.