A Single-Chip Dual-Band CDMA2000 Transceiver in 0.13 /22m CMOS

Abstract

A single-chip, dual-band transceiver for CDMA2000 is presented. The design supporting the North American cellular and PCS bands features a complete zero-IF receiver, a direct-con- version transmitter and two fully integrated synthesizers with VCOs. The analog receiver front-end comprises two self-matched wideband LNAs, a highly linear demodulator, and a third-order baseband filter. In a test version, I/Q ADCs and a digital front-end (DFE) to provide channel and matched filtering are included to demonstrate the performance of a fully integrated analog/digital line-up. Measured maximum SNR values of 23 dB and 25 dB for PCS and Cell bands, respectively, are achieved. The transmitter comprises baseband buffers and filters, an I/Q-modulator and sep- arate output drivers for each band. An analog gain control (AGC) for realization of a dynamic range 90 dB is implemented and a maximum output power of /4313.5 dBm at a total CDG4 urban current of 34 mA is achieved for the PCS band. Measured ACPR1 and /82/104/111values are 59 dBc 30 kHz and 0.998 for the Cell band and 57 dBc 30 kHz and 0.995 for the PCS band, respectively. The chip is fabricated in a 0.13 m RF-CMOS process, occupies a die size of 8.4 mm/50and operates with a 2.5 V supply.