DTMOS based low voltage high performance FVF-OTA and its application in MISO filter

Abstract

This paper presents a high performance Dynamic Threshold MOSFET (DTMOS) based low voltage Flip Voltage Follower-Operational Transconductance Amplifier (FVF-OTA). The proposed DTMOS based FVF-OTA combines the low voltage and high transconductance properties of DTMOS with high input impedance and wide output current range characteristics of FVF-OTA. Furthermore, high linearity along with high bandwidth is achieved through DTMOS technique. To show enhancement in the transconductance of the proposed circuit, small signal analysis is carried out. Moreover, Multi Input Single Output (MISO) filter is realized using the proposed DTMOS based FVF-OTA. Simulations of proposed OTA and its MISO filter application are done in Eldospice (Mentor Graphics) in TSMC 0.18μm technology. In the proposed circuit, a transconductance of 314.73μS is achieved at an operating voltage of ± 0.5 V and power dissipation of 70.19μW. Moreover, MISO filter realized using the proposed OTA attains a bandwidth of 43.91MHz. To validate the robustness of proposed circuit against variations in temperature and aspect ratios of MOSFETs, temperature and Monte Carlo analysis have been done.