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:
Dec. 26, 2006
Filed:
Nov. 23, 2004
Satoru Yamamoto, Takasaki, JP;
Hirotaka Oosawa, Isesaki, JP;
Toshiya Uozumi, Takasaki, JP;
Noriyuki Kurakami, Maebashi, JP;
Jiro Shinbo, Takasaki, JP;
Satoru Yamamoto, Takasaki, JP;
Hirotaka Oosawa, Isesaki, JP;
Toshiya Uozumi, Takasaki, JP;
Noriyuki Kurakami, Maebashi, JP;
Jiro Shinbo, Takasaki, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A communication semiconductor integrated circuit device includes an RFVCO and a TXVCO and is formed over one semiconductor substrate, and has a first operation mode (idle mode) which does not perform transmission and reception, a second operation mode (warmup mode) which performs a preparation prior to the start of transmission or reception, and a third operation mode (transmission or reception mode) which performs transmission or reception. In the first operation mode, two oscillators are deactivated, and the operation of selecting a frequency band to be used in at least the TXVCO which generates a transmit signal, is performed in the second operation mode. In the communication semiconductor integrated circuit device, a high frequency signal generator which generates a signal having a desired frequency with an oscillation signal outputted from a crystal oscillator as a reference signal, a reception system circuit (RXC) including a frequency converter, and a transmission system circuit (TXC) including the TXVCO which generates the transmit signal, are respectively formed in different semiconductor regions isolated by insulators.