A single-chip direct-sequence spread-spectrum CMOS transceiver for high performance, low cost 2.4-GHz cordless applications

A fully-integrated direct-sequence spread-spectrum (DSSS) CMOS transceiver for 2.4-GHz ISM band is presented. It integrates a RF transceiver, a frequency synthesizer, baseband filters, digital signal processing, an Adaptive differential pulse-code modulation (ADPCM) codec, and a programmable PA pre-driver. The transceiver chip achieves a measured sensitivity of - 103 dBm and an output power of 3 dBm. The total chip area is 3.4 × 3.3 mm2 in a standard RF 0.18-μm CMOS technology.