This macro-cell is an ultra low power analog/RF front-end core designed for SilTerra 0.18µm CL180G CMOS technology. It is ideal for use in passive UHF RFID integrated circuits compliant with EPCGlobal Class 1 Gen 2/ISO18006-C standards. The circuit features a complete analog/RF frontend including rectifier, demodulator, backscattering modulator, a power management unit (PMU) and a short-term memory (STM) that generates the persistence flags. The PMU includes an output supply voltage limiter, internal voltage and current references, built-in power-on-reset (POR), and oscillator. Internal blocks are trimmable via a digital word that can reside in the non-volatile memory of the chip.