DTMOS and FD-FVF based low voltage high performance Voltage Differencing Transconductance Amplifier (VDTA) and its application in MISO filter. (May 2017) - Narang, Niharika
Abstract: In this paper, two low voltage high performance Voltage Differencing Transconductance Amplifiers (VDTAs) are proposed. In proposed-I VDTA, Fully Differential Flip Voltage Follower is used to obtain output currents higher than biasing current. This VDTA offers higher transconductances and bandwidth. Proposed-II VDTA is DTMOS implementation of proposed-I VDTA. It utilizes the body effects and shows further improvement in the performance, while operating at lower supply voltage and consuming lesser power. Small signal analysis is done to show the improvements achieved in transconductances. Moreover, Multi Input Single Output and Biquadratic filters are realized using proposed VDTAs. These circuits are simulated in Mentor Graphics Eldospice (TSMC 0.18 µm Level 53 CMOS technology). Simulation results show that at a biasing current of 10 μA, proposed-I (±0.7 V) and proposed-II (±0.5 V) VDTAs have transconductances 415.62 μS and 422.89 μS, bandwidth 225.9 MHz and 296.21 MHz and power dissipation 145.43 μW and 102.14 μW respectively. To authenticate the robustness of proposed VDTAs, Monte Carlo and Corner analyses along with Process-Voltage-Temperature variations are done.