An ultra-low power RF interface for biomedical implantable devices

This paper presents an efficient radio frequency (RF) front-end for power and data telemetry in biomedical implantable devices. The fully integrated system includes an amplitude shift keying (ASK) demodulator, a low drop out (LDO) voltage regulator and a charge pump voltage rectifier. This paper presents a rectifier structure based on Dickson charge pump. Simulation results show that this rectifier can provide ۱.۴ Voltage supply at a PCE of ۳۳.۴%. The rectifier consumes ۸۰µW. The demodulator utilizes an ultra- low power envelope amplifier that removes the need for any voltage comparator or Schmitt trigger circuit, With a carrier frequency of ۱۳.۵۶ MHz and ۴۰ Kbps data rate. The proposed ASK demodulator achieves a modulation index range from ۳۸% consuming less than ۳۲µW. The low drop out regulator can provide a maximum current of ۲.۸ mA and output voltage of ۱.۲ V and drop out voltage is ۲۰۰mV. LDO temperature variation is ۲.۴µV/˚C. The LDO consumes only about ۷۶µW. Designed in a ۰.۱۸ µm CMOS process, the system totally consumes ۲۰۰µW.

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