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:
Jan. 10, 2012
Filed:
Nov. 03, 2008
Hiroaki Matsui, Takasaki, JP;
Taizo Yamawaki, Tokyo, JP;
Yoshiaki Harasawa, Maebashi, JP;
Steve Williams, Royston, GB;
Hiroaki Matsui, Takasaki, JP;
Taizo Yamawaki, Tokyo, JP;
Yoshiaki Harasawa, Maebashi, JP;
Steve Williams, Royston, GB;
Renesas Electronics Corporation, Kawasaki, JP;
TTPCOM Limited, Melbourn, GB;
Abstract
A communication semiconductor integrated circuit includes a phase control loop and an amplitude control loop. A gain of a variable gain amplifier when it is detected from an output of the comparator that the amplitudes of the reference signal and the feedback signal are equal to each other while a predetermined DC voltage is applied to an amplifier which amplifies an output of a transmission oscillation circuit and is controlled by the amplitude control loop to vary the gain of the variable gain amplifier on a feedback path is held in a register. Thereafter, the DC voltage is changed to another value to detect the gain of the variable gain amplifier, so that the gain of a variable gain amplifier on the forward path is decided on the basis of the detected gain and the gain held in the register.