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 /spl mu/m HP AMOS14TB process parameters with all MOS transistors operating in saturation. SPICE simulations show that the total harmonic distortion (THD) at 1.7 V/sub 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.