A New High Performance CMOS Differential Amplifier

Differential amplifiers play a very important role in the analog circuit design because of their excellent performance as input amplifiers and the straightforward application with the possibility of feedback to the input. The classical differential amplifier faces the disadvantage of the nonlinearity of the transfer characteristic, especially for large values of the differential input voltage amplitude. The differential amplifier circuit characterized in terms of self-bias capability, common-mode rejection, voltage gain, and the gain-bandwidth product. In this paper we report a new model for high performance CMOS differential amplifier. The proper selection of device parameters has been playing an important role in the design of differential amplifier. This model is simulated in SPICE simulator and optimized device parameters.