Low voltage floating gate MOSFET based current differencing transconductance amplifier and its applications

This article presents a low voltage low power configuration of current differencing transconductance amplifier (CDTA) based on floating gate MOSFET. The proposed CDTA variant operates at lower supply voltage ±1.4 V with total static power dissipation of 2.60 mW due to the low voltage feature of floating gate MOSFET. High transconductance up to 6.21 mA/V is achieved with extended linear range of the circuit i.e. ±130 μA. Two applications are illustrated to demonstrate the effectiveness of the proposed active block. A quadrature oscillator is realized using FGMOS based CDTA, two capacitors, and a resistor. The resistor is implemented using two NMOSFETs to provide high linearity and tunablility. Another application is the Schmitt trigger circuit based on the proposed CDTA variant. All circuits are simulated by using SPICE and TSMC 130 nm technology.