Simple ± 0.75 volt rail-to-rail current feedback operational amplifier and its application for oscillator

Abstract

A simple rail-to-rail CMOS current feedback operational amplifier (CFOA) is presented. The circuit is developed based on a simple complementary source follower with a common-source output stage. The circuit is designed using a 0.13 μm CMOS technology and HSPICE is used to verify the circuit performance. The circuit operates under the supply of ± 0.75 Volt and can drive sinusoidal input of ± 0.5 Volt to a 300 Ω with the total harmonic distortion of less than 0.8% at 1 MHz. The amplifier, configured for non-inverting gain of two and a 300 Ω load provides 3-dB bandwidth of 40 MHz. The rising slew rate (SR+) and falling slew rate (SR-), for a 300 Ω // 5 pF load are 257 V/μS and 464 V/μS, respectively. The power dissipation is 2.6 mW.