A Low-Noise and Fast-Settling UHF RFID Receiver With Digitally Controlled Leakage Cancellation
| Autor: | Jusung Kim, Jinho Ko, Kyung-Sik Choi, Keun-Mok Kim, Subin Kim, Sang-Gug Lee |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Hardware_MEMORYSTRUCTURES business.industry Settling time Transmitter Electrical engineering Hardware_PERFORMANCEANDRELIABILITY Noise figure Chip law.invention Ultra high frequency CMOS Hardware_GENERAL law Hardware_INTEGRATEDCIRCUITS Electrical and Electronic Engineering Resistor business Hardware_LOGICDESIGN Leakage (electronics) |
| Zdroj: | IEEE Transactions on Circuits and Systems II: Express Briefs. 68:2810-2814 |
| ISSN: | 1558-3791 1549-7747 |
| Popis: | UHF RFID reader suffers from a strong transmitter (Tx) leakage signal coupled to a receiver (Rx), especially for an area-compact single-antenna implementation. Then, several Tx leakage cancellation schemes have been developed not to saturate the Rx and to minimize the performance degradation. This brief proposes a UHF RFID reader Rx with a low noise performance and a fast settling time by employing a digitally controlled leakage cancellation method in both passive and active realizations. A digitally-controlled passive vector reflector enhances the Tx to Rx isolation ratio by providing the optimum load impedance. An active anti-leakage feedback loop adaptively tracks the time-varying leakage and generate the phase-inverted leakage replica to suppress the leakage. The prototype chip is fabricated in a CMOS 55 nm process and the area of the chip is 2.1 mm $\times1.8$ mm. The passive leakage cancellation (PLC) with a vector reflector endures the 1 dBm leakage with a low Rx noise figure of 12.5 dB and 35.7 mW power consumption. The active leakage cancellation (ALC) with an anti-leakage feedback loop covers 6 dBm leakage with a fast settling time of $4.6~\mu \text{s}$ and 58 mW power consumption. |
| Databáze: | OpenAIRE |
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