An integrated Si bipolar RF transceiver for a zero IF 900 MHz GSMdigital mobile radio frontend of a hand portable phone

摘要

A single-chip solution for a GSM (Group Special Mobile) 900-MHz RFnTX quadrature modulator and RX quadrature demodulator was designed andnfabricated in a 9-GHz silicon bipolar technology. The transmit modulatornis a direct upconverter and the receive demodulator operates in a zeronIF architecture. This device is one of the key components of anpocket-size hand-portable phoneset for application in the GSMnpan-European digital mobile radio system. The consumption from thenbattery is 25 mA in RX mode and 45 mA in TX mode. The circuit is powerednfrom a 5-V regulated supply voltage