Energy Harvesting AC/DC CircuitĀ and ASK Demodulator/Modulator

  • RF frequency: 900 MHz (RFID EPC Gen2 interface protocol)
  • AC/DC rectifier generated from basic cell connected in series cascade connection
  • ASK Demodulator designed for RFID bit cycle from 6.25 us to 25 us
  • Antenna load modulation for backscatter link

RFID_mod

Reference

Voltage and Current Reference

  • Voltage reference Vref 485 mV
  • Vref temperature coefficient 7 ppm/C
  • Current reference 100 nA
  • Variation over temperature range -10 C to 70 C: 20 %

Low Power LDO Regulator

  • Output voltage 1.45V with input referent voltage 0.48V
  • Supply capability: 500 uA
  • Quiescent current: 3.7 uA
  • PSSR: -80dB@DC -20dB@1MHz

Regulator

ADC

9-bit Cyclic ADC

  • Low power architecture
  • Design immune to voltage supply variations
  • Speed: 1 KSa/s
  • Power consumption: 11 uW
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Oscillator

  • Frequency: 3.66 MHz
  • Power consumption: 7.4 uW
  • Minimum voltage supply: 1.2V
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Oscillator

Digital

Digital Logic for IntRFID

  • Logic for ADC conversion
  • Logic for EPC Gen2 protocol (protocol subset)
  • Clock frequency: 2 MHz
  • Voltage supply range: 1.2V - 1.6V
  • Temperature range: 0 C - 80 C