Inverter-based, low-power and low-voltage, new mixed-mode Gm-C filter in subthreshold CNTFET technology

摘要

This study presents a new low-voltage and low-power, mixed-mode, universal Gm-C filter capable of generating simultaneous filtering outputs. The proposed circuit employs only 19 inverters as operational transconductance amplifiers, and 2 grounded capacitors in carbon nanotube field-effect transistor (CNTFET) technology. However, due to the proper use of subthreshold transistors biased at ±0.25 V supply, the power consumption of the proposed circuit is reduced effectively. Furthermore, as the HSPICE simulation results show, the proposed filter consumes only 11.66 μW of power, while its total harmonic distortion is obtained -55.4 dB at 100 MHz centre frequency. Moreover, the input referred noise values at 100 MHz are reduced to 11.57 nV√Hz and 760 fA√Hz in voltage and current modes, respectively.