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:
Apr. 17, 2012
Filed:
Nov. 10, 2009
Kaoru Katoh, Mitaka, JP;
Shigeki Koya, Koganei, JP;
Shinichiro Takatani, Mitaka, JP;
Yasushi Shigeno, Maebashi, JP;
Akishige Nakajima, Higashiyamato, JP;
Takashi Ogawa, Tokyo, JP;
Kaoru Katoh, Mitaka, JP;
Shigeki Koya, Koganei, JP;
Shinichiro Takatani, Mitaka, JP;
Yasushi Shigeno, Maebashi, JP;
Akishige Nakajima, Higashiyamato, JP;
Takashi Ogawa, Tokyo, JP;
Renesas Electronics Corporation, Kawasaki-shi, JP;
Abstract
The present invention is directed to reduce increase in the level of a harmonic signal of an RF (transmission) Tx output signal at the time of supplying an RF Tx signal to a bias generation circuit of an antenna switch. A semiconductor integrated circuit includes an antenna switch having a bias generation circuit, a Tx switch, and an antenna switch having a bias generation circuit, a transmitter switch, and a receiver (Rx) switch. The on/off state of a transistor of a Tx switch coupled between a Tx port and an I/O port is controlled by a Tx control bias. The on/off state of the transistors of the Rx switch coupled between the I/O port and a receiver (Rx) port is controlled by an RX control bias. A radio frequency (RF) signal input port of the bias generation circuit is coupled to the Tx port, and a negative DC output bias generated from a DC output port can be supplied to a gate control port of transistors of the Rx switch.