A tri-band (2100/1900/800 MHz) single-chip cellular transceiver for WCDMA/HSDPA

The RFIC implemented is a tri-band (2100/1900/800 MHz) direct conversion transceiver for 3G cellular applications supporting WCDMA and HSDPA (high speed downlink packet access) schemes. It was implemented using an enhanced CDR1 BiCMOS (0.35 μm) SiGe:C process with electroplated copper inductors. The zero-IF receiver is comprised of three sets of quadrature mixers, 7^th order baseband filtering and DC offset correction circuitry. The direct launch transmitter is made of a 3^rd order baseband filter, an I/Q modulator with variable gain, an RF variable gain amplifier, and a PA driver. There are two on-chip process tracking oscillators to tune the filter poles and zeros. There are two fractional-N synthesizers together with two automatically calibrated integrated VCOs on the die. The IC draws 34 mA in receive and 49-64 mA in transmit using a 2.775 V supply voltage.