A low-voltage transconductor for analog signal-processing applications

Abstract

This dissertation presents a low-voltage low-power voltage-to-current converter (V-I Converter) realized using TSMC 40 nm CMOS technology. The desired circuit operates at a supply voltage of 0.45 V with an input signal range of 0.1 V to 0.3 V. It consists of cutoff based active resistors, level shifters, a three-stage operational trans-conductance amplifier (OTA), and the resistor array to produce programmable output currents with low temperature coefficients. The V-I Converter has achieved temperature coefficients of less than 54.68 ppm/°C for all the output currents between -20 °C and 80 °C, with a power dissipation of less than 2.76 μW. The obtained bandwidth is 34.45 kHz, and the total harmonic distortion (THD) is -56.66 dB at 1 kHz, 0.1 VPP input signal. With its low-voltage low-power consumption, multiple output currents having low temperature coefficient, it can be applied for portable devices, implantable electronics, analog signal-processing and sensor signal processing applications.