An ultra-low power 400MHz OOK transceiver for medical implanted applications

A 400MHz on-off keying transceiver for medical implant applications is presented. The transceiver achieves ultra-low power and high sensitivity with an analog “quadratic sum” demodulation scheme, which enables the using of a low intermediate frequency and a free-running oscillator for power saving. A new current-reuse structure and an inductor-sharing technique for front-end are also introduced to further reduce power consumption. The transceiver is implemented in 0.18μm CMOS process with 3.18mm² chip area. At 2 Mbps data rate, the receiver achieves energy efficiency of 1.71nJ/bit with sensitivity of -80.2dBm for 10^-3 BER, and the transmitter achieves energy efficiency of 1.53nJ/bit with -2.17dBm output power.