A 90nm CMOS Direct Conversion Transmitter for WCDMA

A linear high output power CMOS direct conversion transmitter for wide band code division multiple access (WCDMA) is presented. Circuit level third order distortion cancellation is applied to driver amplifier to achiever single end output power +9.6 dBm with -43.2dBc ACLR@5Mhz and 10% power efficiency at band II. The transmitter is fabricated in 90nm CMOS technology and die area is 1.1mm × 1.4mm. The transmitter consumes 91.4mW while delivering +9.6 dBm output power. The VDD supply for upconverter is 1.4V, and the VDD for driver amplifier is 3V. The packaged type is 32 pins 5mm×5mm QFN.