Design of UHF Voltage Multiplier for Radio-Triggered Wake-Up Circuit

An analytical model of an ultra-high frequency (UHF) voltage multiplier for the radio-triggered wake-up of ZigBee or Bluetooth is derived in this paper. The model is compliant with HSpice simulations, and it allows for short design time of an optimal voltage multiplier. With low incident RF signal power, the optimal design of the voltage multiplier takes into account the number of stages of the multiplier, the diode parameters, and the load impedance. We design and optimize a voltage multiplier according to this model, with an RF input signal of 2.4 GHz, -37 dBm and a 200MΩ load, it can provide a constant dc output of 1V within a few tens microseconds. The circuit can be used in existing wireless devices with immediate benefit.