Design of High Gain Single Stage Telescopic Cmos Operational Amplifier

Abstract

A need for high gain operational amplifiers (op-amps) exists for certain applications. This requires research in the area of its gain without affecting other parameters drastically. In this paper, high gain single stage Telescopic CMOS operational amplifier has been designed and verified, using PSPICE simulation software. The designed circuit operates at ±5V power supply in the 1µm CMOS technology. The simulation results show that the proposed single stage Telescopic CMOS op-amp has an open loop gain of 77.777dB, unity gain frequency of 7.3054MHz, ICMR of -0.248V to 4.4120V and output voltage swing of 7688.8 times to that of input. A 2pF load capacitor is applied in performing a stable phase margin of 80.669°. As result shows that the designed circuit has high gain, which is used for various applications where very large gain is required to amplify weak signals, such as heart beat in medical instrumentations. The total power consumed by the device is 0.589mW. This shows that the power consumed by the device is too small. Therefore, this device can operate for longer duration of time. The smaller the power dissipation the better the device is. Low power operation is a very important quality factor for batteries that should supply the system for hours or days to power more and more electronic systems.