Abstract
This work reports a novel Graphene Field Effect Transistor (GFET) based transimpedance amplifier (TIA) for optical radar detection in medical applications. Design-I includes a microstrip line (MSL) based UWB resonator circuit which enables the TIA design to operate in UWB range of frequency with high Q-factor. Design-II comprises MSL UWB resonator integrated stagger-tuned CR-RGC TIA which enhances the transimpedance limit and mitigates the effect of photodiode capacitance results in higher bandwidth performance. The proposed TIA realizes a 2.6 times lesser noise compared to the conventional CR-RGC TIA. A flat transimpedance gain of 64 dBΩ and ultra-low input-referred noise current density of 8.9 pA/√Hz are achieved using gain and noise optimization methods. Additionally, a dynamic range of 49 dB with a group delay variation (GDV) of ±25 ps is achieved over the entire UWB range. The TIA demonstrates a 25 Gb/s data rate while a bit-error-rate (BER) less than 10−10 is achieved. The chip occupies an area of 0.67∗0.72 mm2 while consuming power of 19 mW under the supply voltage of 1.8 V.
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