A single-chip CMOS UHF RFID reader transceiver for Chinese mobile applications

UHF RFID reader transceiver for Chinese local standard (840845 MHz and 920925 MHz), in concord with the protocols of EPC Class-1 Gen-2 and ISO/IEC 180006C, is presented. A highly linear RF front-end with low flicker noise, an on-chip self-jammer cancellation (SC) circuit with fast time-varying cut-off frequency and a DC-offset cancellation (DCOC) circuit are proposed to deal with the large self-jammer in the receiver. In the presence of 22 dBm PA output power, the receiver achieves a sensitivity of -79 dBm including the 15 dB loss of the directional coupler. A CMOS class-AB PA is integrated in the transmitter, with 22 dBm output power and 35% PAE. The spectrum mask achieves ACPR 1 of -45 dBc and ACPR2 of -60 dBc. A sigma-delta fractional-N PLL with a single LC VCO is also implemented for good phase noise (-126 dBc/Hz @ 1 MHz offset) and high frequency resolution within 1 kHz. This single-chip is fabricated in a 0.18 ??m standard CMOS process. It occupies a silicon area of 13.5 mm2 and dissipates 203 mW from a 1.8 V supply voltage when transmitting 7.5 dBm output power. ? 2010 IEEE.EI71316-13294