A 3.3 V linear fully balanced CMOS operational transconductance amplifier for high-frequency applications

This paper describes a simple CMOS technique for realizing a linear, voltage tunable operational transconductance amplifier (OTA). The proposed circuit has been developed and simulated using the MOS 0.5 μm HP AMOS14TB process parameters with all MOS transistors operating in saturation. SPICE simulations show that the total harmonic distortion (THD) at 1.7 V_pp is less than 0.3% with dynamic range equal to 74 dB at power consumption of 2.9 mW from a single 3.3 V supply. As an example of application, two OTAs are used to design a four-quadrant analog multiplier.