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:
Mar. 06, 2007
Filed:
Jun. 08, 2004
Satoshi Arayashiki, Takasaki, JP;
Hirotaka Oosawa, Isesaki, JP;
Noriyuki Kurakami, Maebashi, JP;
Akira Okasaka, Takasaki, JP;
Yasuyuki Kimura, Maebashi, JP;
Toshiya Uozumi, Takasaki, JP;
Hirokazu Miyagawa, Takasaki, JP;
Satoshi Tanaka, Tamamura, JP;
Satoshi Arayashiki, Takasaki, JP;
Hirotaka Oosawa, Isesaki, JP;
Noriyuki Kurakami, Maebashi, JP;
Akira Okasaka, Takasaki, JP;
Yasuyuki Kimura, Maebashi, JP;
Toshiya Uozumi, Takasaki, JP;
Hirokazu Miyagawa, Takasaki, JP;
Satoshi Tanaka, Tamamura, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
The invention provides a communication semiconductor integrated circuit (RF IC) that, when a transmission oscillator is incorporated into a semiconductor chip, secures the oscillation operation over a wide frequency range, prevents a deterioration of a transmission spectrum, and thereby enhances the accuracy of an oscillation frequency. The integrated circuit corrects a dispersion of the KV characteristic of the transmission oscillator by calibrating a current Icp of the charge pump inside the phase control loop. More in concrete, the integrated circuit measures a KV value Kv of the transmission oscillator, and calibrates the current Icp of the charge pump so that Kv·Icp falls into a predetermined value.