A novel low-noise high-linearity CMOS transmitter for mobile UHF RFID reader

A novel CMOS transmitter with low TX noise and high linearity is implemented in a 0.18 μm 1P6M standard CMOS process for Mobile UHF RFID reader. Adopting double-sideband amplitude-shift-keying （DSB- ASK） as the only modulation is supported, this transmitter has very low power consumption. A novel analog baseband circuit is proposed to reduce the transmitter noise. With a Gm＂-cancellation technology, a highly linear up-conversion active mixer and a power amplifier driver are designed. The transmitter has a measured output 1 dB compression point of 13.4 dBm. Occupying a silicon area of about 1 mm2 and consuming 144 mW from a 1.8 V voltage supply, the transmitter makes the Mobile UHF RFID reader communicate with a transponder in a distance of 1 m conveniently.