A HIGH-DRIVE FULLY DIFFERENTIAL CURRENT MODE OPERATIONAL AMPLIFIER PROVIDING HIGH OUTPUT IMPEDANCE AND FILTER APPLICATION

In this study, fully differential CMOS current-mode operational amplifier (COA) which provides high drive capability and output impedance is presented. The proposed COA is operated under ±1.5 V voltage supplies and designed with 0.35-μm CMOS process. As using class AB input and output stages, the amplifier can drive a 1kΩ load resistance with a maximum bipolar output current of about 350 μA while the quiescent current of all the branches are only 20 μA. Furthermore it exhibits 100dB DC gain, 85 MHz gain-bandwidth product and 6.1 GΩ output resistance. Finally, a second order notch filter is realized to demonstrate the performance of the proposed COA. I