A single-chip quad-band (850/900/1800/1900 MHz) direct-conversion GSM/GPRS RF transceiver with integrated VCOs and fractional-N synthesizer

A monolithic IC has been designed which integrates all the active RF functions of a quad band GSM handset except for the power amplifier. A direct-conversion receiver (900 MHz, NF 3.0 dB, IIP2 +65 dBm) and an up-conversion loop transmitter (900 MHz spectrum at 400 kHz -65 dBc, phase noise at 20 MHz -64 dBc/Hz) using a fractional-N PLL and fully-integrated transmit and UHF VCOs.