Mirrored Current-Conveyor Transimpedance Amplifier for Home Monitoring LiDAR Sensors

Abstract

This article presents a current mode transimpedance amplifier (TIA) implemented in a standard 65-nm CMOS technology for the applications of elder-care home monitoring LiDAR sensors. Particularly, a novel mirrored current-conveyor (MCC) input configuration is proposed to lower the input impedance, thus achieving a wide bandwidth. This MCC-TIA can alleviate severe pulse spreading issue for near-range detection, enabling effective narrow-pulse recovery. Also, a feedforward control-voltage generator is newly suggested to realize an automatic gain-control within a single pulse-width duration. Measured results demonstrate the variable transimpedance gain of59 similar to 77 dB Omega to accommodate the incoming input currents of 18 mu A(pp) similar to 2.24 mA(pp) that corresponds to the feasible detection range of 0.5 similar to 5.3 meters in an elder's home. The bandwidth of 83 MHz similar to 2.6 GHz is measured with the minimum noise current spectral density of 16.8 pA/sqrt(Hz). The chip dissipates 40 mW in total, and occupies the area of 1.0 mm(2), including I/O pads.