Design of a High-Precision Low-Offset Operational Amplifier
Yu Jia · 2005
Based on bias-current-cancellation, offset trimming and common centroid geometry techniques, a high-precision operational amplifier with very low offset is designed. The circuit is simulated and tested. Results show that it has achieved an open-loop gain of 125 dB, a CMRR of 120 dB, an offset voltage of 18 μV and a slew rate of 0.6 V/μs. The amplifier can be used in a wide range of applications, such as precise simulation calculation, high-precision voltage regulator and automated instrumentations.