Patent ID: 7269156

Claim:
A high-frequency circuit device that is conformable to both of a Time Division Multiple Access (TDMA) system and a Code Division Multiple Access (CDMA) system as well as a plurality of frequency bands, comprising: a transmission amplifier circuit for transmitting high-frequency power from an antenna, the transmission amplifier circuit being shared in the TDMA system and the CDMA system; a duplexer that is provided for performing simultaneous transmission/reception according to the CDMA system; upstream and downstream switch circuits in a direction of transmission that are provided so as to sandwich the duplexer between the transmission amplifier circuit and the antenna and are switched on when the simultaneous transmission/reception is performed according to the CDMA system; and a bypass switch circuit that bypasses the upstream and downstream switch circuits and the duplexer; wherein the transmission amplifier circuit comprises; a first high-frequency amplifier that performs Gaussian filtered minimum shift keying (GMSK) modulation, General Packet Radio Service (GPRS) modulation, or Enhanced Data rates for GSM Evolution (EDGE) modulation so as to conform to a frequency band of Global System for Mobile Communications (GSM) according to the TDMA system; and a second high-frequency amplifier that is used with respect to both of the TDMA system and the CDMA system, performs the GMSK modulation, the GPRS modulation, or the EDGE modulation so as to conform to a frequency band of Digital Cellular System (DCS) or Personal Communication Services (PCS) according to the TDMA system, and operates according to a narrow-band CDMA system or a W-CDMA (UMTS) system so as to conform to a frequency band of Universal Mobile Telecommunication System (UMTS) according to the ODMA system.