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This paper reports a low-power sensor signal processing and load shift keying (LSK) telemetry scheme for an inductively powered implant system. The entire system manifests a voltage reference (VR), a potentiostat, and a current controlled oscillator (CCO). All of the functional blocks are designed using subthreshold MOSFETs to achieve ultra-low-power consumption. Relatively simpler architecture of the VGR saves area and power. The CCO generates frequency modulated digital pulses depending upon sensor current. The proposed system has been designed and simulated in 65 nm standard CMOS process and the entire system consumes less than 20 μW.
Date of Conference: 16-19 Jan. 2011