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A passive UHF RF identification (RFID) tag IC with embedded 2-KB ferroelectric RAM (FeRAM) for rewritable applications enables a 2.9 times faster read-and-write transaction time over EEPROM-based tag ICs. The resulting FeRAM-based tag has a nominally identical communication range for both read and write operations, which is indispensable for data write applications. The evaluated tag communication range with a folded dipole antenna is from 0 m to 4.3 m, at the 953-MHz carrier frequency with 4-W transmitting Effective Isotropic Radiated Power (EIRP) from a reader/writer. The developed tag IC features two circuit blocks to maximize the communication range in 0.35-m CMOS/FeRAM technology.First is a CMOS-only full-wave rectifier, which can improve the measured efficiency by up to 36.6% by reducing the input parasitic capacitances and optimization of multiplier structure. This efficiency is more than twice that of previously-published results. Second is a low-voltage current-mode ASK demodulator to accommodate a low-breakdown voltage of FeRAM, which converts the ASK power modulation into a linearly modulated current over an incoming power range of 27 dB, corresponding to the entire communication range. The developed demodulator can thus resolve the primary design tradeoff issue between device protection and detection sensitivity in the conventional voltage-mode demodulator.Index Terms-CMOS-only full-wave rectifier, current-mode demodulator, electromagnetic radiative interference, ferroelectric random access memories, identical read/write communication, UHF radio frequency identification.

Asymptotic Waveform Evaluation Techniques (AWE) have been used to develop macromodels that allow for accurate and efficient simulation of substrate-related parasitic electrical coupling effects using a modified version of SPICE3. While achieving comparable accuracy to a mixed device-circuit simulator (PISCES IIB), simulation time is reduced by several orders of magnitude.

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