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An area-efficient digitally-assisted DC canceling loop is presented for high sensitivity single-chip UHF RFID readers. The proposed loop suppresses the DC blocker in RFID receivers by 41 dB with the aid of negative feedback. A delta-sigma modulator with 67dB dynamic range is implemented in the loop to enhance the sensitivity of the receiver. A reconfigurable digital loop filter with low cut off frequency...
A CMOS passive mixer-first receiver front-end for UHF RFID Reader is presented in this paper. Instead of LNA input structure, we choose single-balanced passive mixer as the input stage to improve compression point, and can handle the large jammer noise from the leakage of the transmitter. The transimpedance amplifiers are followed by the mixers to provide enough gain and suppress the noise behind...
Digital predistortion is one of the most successful approaches to linearize a nonlinear power amplifier. However in most lookup-table (LUT) based digital predistorters, memories are not efficiently used because they are uniformly spaced. In this paper, a simple but effective method is proposed to make the LUT size significantly reduced. This method applies A-law companding to space the table and linear...
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