Design of Noise Power Flexible Opamp

Abstract

The modern electronics industry is witnessing the dominance of miniaturization in every sphere of electronics and communications forming the backbone of medical electronics, mobile communications, computers, state-of-art processors etc. All efforts eventually converge on decreasing the power consumption entailed by ever shrinking size of the circuits enabling the portable gadgets. Designing high performance analog circuits is becoming increasingly challenging with the persistent trend towards reduced supply voltages .The main building block in an analog circuit is the operational – amplifier. The main characteristics under consideration are high gain, high PSRR, low offset voltage, high output swing. At reduced supply voltages, in addition to output swing, noise and power are other two very important parameters.

Noise limits the minimum signal level that a circuit can process with acceptable quality. Today’s analog designers constantly deal with the problem of noise because it trades with power dissipation, speed and linearity. Real circuits, of course, are never immune from small," random" fluctuations in voltage and current levels.

In the present work a Noise Power flexible Opamp with RC compensation has been designed. This Opamp is more flexible than conventionally designed Opamp by RC compensation. This is due to the fact that there is no requirement of CC >> Cgs6 .The power consumption increases as compensation capacitance increases while the Input Referred Noise decreases and vice-versa. So there is a trade-off between Power and Noise. The technology used is TSMC 0.35um, 3.3v CMOS N-well process for the designing of Opamp. The value of the load capacitance taken as 5pF.