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. 25, 2006
Filed:
Feb. 26, 2003
Ryoichi Takano, Takasaki, JP;
Kenji Toyota, Takasaki, JP;
Patrick Wurm, Comberton, GB;
Robert Astle Henshaw, Sudbury, GB;
David Freeborough, Balsham, GB;
Ryoichi Takano, Takasaki, JP;
Kenji Toyota, Takasaki, JP;
Patrick Wurm, Comberton, GB;
Robert Astle Henshaw, Sudbury, GB;
David Freeborough, Balsham, GB;
Renesas Technology Corp., Tokyo, JP;
TTPCOM Limited, Hertfordshire, GB;
Abstract
A polar-loop wireless communication apparatus includes, on a forward path between an amplitude detector and a power amplifier which constitute an amplitude control loop, a variable gain amplifier and a switch to change characteristics of a loop filter to output a frequency bandwidth of the amplitude control loop to an order less than an order for normal operation. The system is operated with the characteristics set to the lower order to measure outputs from the power amplifier to calibrate the output power of the power transmitter, and the register is operated with the characteristics set to the higher order to measure the open loop gain of the amplitude control. According to results of the calculation, data to correct gain characteristics of the variable gain amplifier with respect to an output control signal is stored in a nonvolatile memory of a baseband circuit.