A new CMOS design of high transconductance current follower transconductance amplifier and its applications

Abstract

In this work, a new CMOS implementation of high transconductance current follower transconductance amplifier (CFTA) is proposed. The proposed CFTA uses current starving technique along with an auxiliary unit (AU) to enhance transconductance performance. The cross-drain-coupled MOSFETs are also used in AU which further enhances transconductance of proposed circuit. The proposed CFTA provides higher transconductance and wider tuning range without affecting its output swing and bandwidth performance. The proposed CFTA provides transconductance of 11.3 mS, dissipates 1.8 mW power and operates at ± 0.6 V supply voltage. A current mode third order quadrature oscillator and biquad filter have been designed and simulated, to validate the performance of proposed circuit. The workability of proposed CFTA and its applications have been verified by using Cadence virtuoso schematic composer with TSMC 0.18 µm process parameters.