Ultra low power RF transceiver architecture for in-body communication system

Abstract

This paper presents a ultra low power RF transceiver architecture for 402–405MHz medical implant communication system. The differential complementary colpitts super-regenrative oscillator is used in this architecture to achieve low phase noise, high gain and linearity at low power consumption. The external PCB loop antenna is incorporated into the oscillator. This provides a high Q-factor inductive element to achieve high sensitivity and selectivity. The oscillator transmits RF signals in switched OOK mode and receives in super-regenerative mode. The DSSS super-regenerative mode is proposed for multi-user enviornment. The design concept is simulated in 0.18um CMOS technology. The exchange rate upto 120kbps is achieved for detecting −95dBm signals with the power consumption of 400uW.