A fractional-N frequency synthesizer for single-chip UHF RFID reader |
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Authors: | Run-Xi Zhang Yi-Hao Chen Chun-Qi Shi Zong-Shen Lai |
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Affiliation: | 1. IMCS, East China Normal University, Shanghai, 200062, China
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Abstract: | A novel fractional-N frequency synthesizer which is based on delta sigma modulator (DSM) and specialized for single-chip UHF 860-to-960 MHz band radio frequency identification (RFID) reader is proposed in this paper. The fractional-N synthesizer is implemented in 0.18 μm CMOS process. The phase noise of the fractional-N synthesizer is approximately ?109 and ?129 dBc/Hz at 200 kHz and 1 MHz offset from 900 MHz operating frequency while drawing 9.6 mA from 1.8 V power supply. The synthesizer is evaluated by implementing it in a direct conversion RF front-end. The front-end features a noise figure of 3.5 dB and an input-referred third-order intercept point of 5 dBm. |
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