An injection locked, RF powered, telemetry IC in 0.25 /spl mu/m CMOS

This wireless transponder recovers power and a reference clock from an incident RF signal and returns data on a 900MHz carrier. A multi-stage voltage multiplier/rectifier converts the received low power RF signal to a useful DC voltage and stores the energy on a storage capacitor. The injection locking technique facilitates power efficient generation of a low phase noise 900MHz internal clock from the received 450MHz signal by employing a fully integrated low power LC oscillator. A fully integrated pseudodifferential power amplifier operating in class AB regime is used as the output stage of the system. The system dissipates an average of 5 /spl mu/A in standby mode and 1.1 mA during active operation.