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Operational amplifiers have a wide range of applications in converters, comparators, voltage generators etc., and are designed flexibly based on the application. Bandgap reference circuit has a pivot role in mixed circuits. Requirement of constant voltage irrespective of process, voltage, and temperature variations are essential in analog and digital applications. Operational amplifier is the crucial entity in bandgap reference circuit for generating a constant reference voltage. Efficient and Low power operational amplifier is to be dealt with the bandgap reference circuit to yield high throughput. As operational amplifiers have many applications, a simple design with low power consumption, high gain, and reasonable unity gain band and phase margin are required for bandgap reference circuit design. In this paper, a 5 V two stage operational amplifier with zero compensation is designed for bandgap reference circuit applications. The two stage operational amplifier provided a gain of 73.52 dB, unity gain bandwidth of 3.89 MHz and phase margin of 63.23◦ with a power consumption of 0.9 mW. 0.18 μm CMOS technology SCL parameters used in the design.

Design of a Two Stage Operational Amplifier with Zero Compensation for Accurate Bandgap Reference Circuit