It is possible to automatically tune LC networks using a Q-enhanced technique as the core of the analog tuning system. In this regard, we describe herein the design of an LC tuner based on negative resistances suitable for RFID applications. In this paper we review the LC tuning technique and show how the equivalent quality factor of the LC network is controlled over different voltage levels. We integrated the tuner prototype in a standard 130-nm CMOS process using an active area of 150 μm × 150 μm. Its performance was validated using off-the-shelf components that emulate the resonating circuits of an RFID system.

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Keywords Capacitance, circuit tuning., LC circuits, LC tuning, on-chip LC tuner, Q-enhanced LC tuner, Radiofrequency identification, Resistance, RFID tuner, RLC circuits, Tuners, Voltage control
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Journal IEEE Transactions on Circuits and Systems II: Express Briefs
Silva, P.M.M. (Paulo M. M.), de Sousa, F.R. (Fernando Rangel), & Plett, C. (2018). On-chip automatic LC tuner for RFID tags based on negative resistances. IEEE Transactions on Circuits and Systems II: Express Briefs. doi:10.1109/TCSII.2018.2789938