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A fully integrated GSM/GPRS quad-band transceiver is presented. It includes the receiver, the transmitter, the synthesizer, all necessary voltage-controlled oscillators, all loop filters, the voltage regulators, the voltage-controlled crystal oscillator, and the power amplifier controller. The chip meets all GSM specification. The design was done in a BiCMOS SiGe 0.35-μm technology and the die area is 14 mm2.