A CNTFET based Multi-Stage Transimpedance Amplifier for Blood Glucose Monitoring Systems

In this paper, the design of an ultra-low-power, low noise carbon nanotube field effect transistor (CNTFET) based transimpedance amplifier (TIA) is presented for an amperiometric based blood glucose monitoring system for wearable devices. The proposed cascode common source multistage transimpedance amplifier circuit is designed and implemented in CNTFET technology. It has been demonstrated that the performance of the proposed TIA can be enhanced by considering an optimum number of CNTs, the CNT pitch and CNT diameter. The TIA shows a significant increase in transimpedance gain, 572 MΩ, with a bandwidth of 200 MHz and an input referred current noise of 8.3 fA/⇃Hz for an input current of 2 nA. The total power consumption is 11 pW with a 1.8 V supply.

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