Vol. 166
Latest Volume
All Volumes
PIERC 171 PIERC 170 PIERC 169 PIERC 168 PIERC 167 PIERC 166 PIERC 165 PIERC 164 PIERC 163 PIERC 162 PIERC 161 PIERC 160 PIERC 159 PIERC 158 PIERC 157 PIERC 156 PIERC 155 PIERC 154 PIERC 153 PIERC 152 PIERC 151 PIERC 150 PIERC 149 PIERC 148 PIERC 147 PIERC 146 PIERC 145 PIERC 144 PIERC 143 PIERC 142 PIERC 141 PIERC 140 PIERC 139 PIERC 138 PIERC 137 PIERC 136 PIERC 135 PIERC 134 PIERC 133 PIERC 132 PIERC 131 PIERC 130 PIERC 129 PIERC 128 PIERC 127 PIERC 126 PIERC 125 PIERC 124 PIERC 123 PIERC 122 PIERC 121 PIERC 120 PIERC 119 PIERC 118 PIERC 117 PIERC 116 PIERC 115 PIERC 114 PIERC 113 PIERC 112 PIERC 111 PIERC 110 PIERC 109 PIERC 108 PIERC 107 PIERC 106 PIERC 105 PIERC 104 PIERC 103 PIERC 102 PIERC 101 PIERC 100 PIERC 99 PIERC 98 PIERC 97 PIERC 96 PIERC 95 PIERC 94 PIERC 93 PIERC 92 PIERC 91 PIERC 90 PIERC 89 PIERC 88 PIERC 87 PIERC 86 PIERC 85 PIERC 84 PIERC 83 PIERC 82 PIERC 81 PIERC 80 PIERC 79 PIERC 78 PIERC 77 PIERC 76 PIERC 75 PIERC 74 PIERC 73 PIERC 72 PIERC 71 PIERC 70 PIERC 69 PIERC 68 PIERC 67 PIERC 66 PIERC 65 PIERC 64 PIERC 63 PIERC 62 PIERC 61 PIERC 60 PIERC 59 PIERC 58 PIERC 57 PIERC 56 PIERC 55 PIERC 54 PIERC 53 PIERC 52 PIERC 51 PIERC 50 PIERC 49 PIERC 48 PIERC 47 PIERC 46 PIERC 45 PIERC 44 PIERC 43 PIERC 42 PIERC 41 PIERC 40 PIERC 39 PIERC 38 PIERC 37 PIERC 36 PIERC 35 PIERC 34 PIERC 33 PIERC 32 PIERC 31 PIERC 30 PIERC 29 PIERC 28 PIERC 27 PIERC 26 PIERC 25 PIERC 24 PIERC 23 PIERC 22 PIERC 21 PIERC 20 PIERC 19 PIERC 18 PIERC 17 PIERC 16 PIERC 15 PIERC 14 PIERC 13 PIERC 12 PIERC 11 PIERC 10 PIERC 9 PIERC 8 PIERC 7 PIERC 6 PIERC 5 PIERC 4 PIERC 3 PIERC 2 PIERC 1
2026-02-22
A 50 pA -Input-Bias-Current 134 dB -Open-Loop-Gain Operational Amplifier with a New CMFB and Base Current Compensation Circuit
By
Progress In Electromagnetics Research C, Vol. 166, 169-175, 2026
Abstract
In the design of a precision operational amplifier (OPA), cancellation of the input bias current is a challenging issue, which is primarily limited by the current mirror mismatch and the low β value of the PNP transistors. This article proposes a new base current compensation design, which enables zero input-bias-current theoretically. The input stage of the circuit is an active load differential pair with a new common-mode feedback (CMFB) circuit based on the current reuse technique, which can provide a stable common-mode voltage for the amplifier without additional power consumption and area occupation. The proposed OPA is designed in a bipolar process with a core area of 2.85 mm × 1.5 mm. Simulation results show that this OPA achieves a 134 dB open-loop-gain, 50 pA input-bias-current @25˚C, and a low supply current of 0.9 mA, which suggests a concise architecture of the OPA for low offset, low noise, low input bias current, and high gain.
Citation
Ting Hong, Wenchang Li, Jian Liu, and Tianyi Zhang, "A 50 pA -Input-Bias-Current 134 dB -Open-Loop-Gain Operational Amplifier with a New CMFB and Base Current Compensation Circuit," Progress In Electromagnetics Research C, Vol. 166, 169-175, 2026.
doi:10.2528/PIERC25120703
References

1. Ivanov, Vadim and Munaf Shaik, "5.1 A 10 MHz-bandwidth 4 µs-large-signal-settling 6.5 nV/√ Hz-noise 2 µV-offset chopper operational amplifier," 2016 IEEE International Solid-State Circuits Conference (ISSCC), 88-89, San Francisco, CA, USA, 2016.
doi:10.1109/ISSCC.2016.7417920

2. Pakhomov, I. V., D. V. Medvedev, A. V. Bugakova, and V. P. Dimitrov, "The new architectures of the class AB differential stages for the high-speed CMOS-BiJFET of the operational and differential difference amplifiers of the sensor analog interfaces," 2017 International Siberian Conference on Control and Communications (SIBCON), 1-6, Astana, Kazakhstan, 2017.
doi:10.1109/SIBCON.2017.7998505

3. Scandurra, G., G. Cannatà, G. Giusi, and C. Ciofi, "A differential-input, differential-output preamplifier topology for the design of ultra-low noise voltage amplifiers," 2017 International Conference on Noise and Fluctuations (ICNF), 1-4, Vilnius, Lithuania, 2017.
doi:10.1109/ICNF.2017.7985947

4. Kim, Hyungseup, Yongsu Kwon, Donggeun You, Hyun-Woong Choi, Seong Hyun Kim, Hyunwoo Heo, Choul-Young Kim, Hi-Deok Lee, and Hyoungho Ko, "Low-noise chopper amplifier using lateral PNP input stage with automatic base current cancellation," IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 68, No. 7, 2297-2301, Jul. 2021.
doi:10.1109/TCSII.2021.3063358        Google Scholar

5. Gray, Paul R., Paul J. Hurst, Stephen H. Lewis, and Robert G. Meyer, Analysis and Design of Analog Integrated Circuits, John Wiley & Sons, 2009.

6. Sansen, Willy M., Analog Design Essentials, Springer Science & Business Media, 2006.

7. Razavi, Behzad, Design of Analog CMOS Integrated Circuits, McGraw-Hill, 2001.

8. Jia, Chenqiang, Wenchang Li, Wei Ruan, Tianyi Zhang, and Jian Liu, "An ICMR-enhanced three-opamp instrumentation amplifier," Microelectronics Journal, Vol. 151, 106342, 2024.
doi:10.1016/j.mejo.2024.106342        Google Scholar

9. Thoutam, S., J. Ramirez-Angulo, A. Lopez-Martin, and R. G. Carvajal, "Power efficient fully differential low-voltage two stage class AB/AB op-amp architectures," 2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512), I-733, Vancouver, BC, Canada, 2004.
doi:10.1109/ISCAS.2004.1328299

10. Leung, Ka Nang and P. K. T. Mok, "Analysis of multistage amplifier-frequency compensation," IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, Vol. 48, No. 9, 1041-1056, Sep. 2001.
doi:10.1109/81.948432        Google Scholar

11. Li, Hongpin, Fashun Yang, and Kui Ma, "Design of a low offset operational amplifier based on bias current compensation," Microelectronics & Computer, Vol. 41, No. 5, 140-146, 2024.
doi:10.19304/J.ISSN1000-7180.2023.0314        Google Scholar

12. Wang, Cheng-He, Liang Guo, and Yuan-Jie Zhou, "A low noise precision operational amplifier," 2020 IEEE 15th International Conference on Solid-State & Integrated Circuit Technology (ICSICT), 1-3, Kunming, China, 2020.
doi:10.1109/ICSICT49897.2020.9278366

13. He, Guikun, "Research on ultra-low offset integrated operational amplifier," Guizhou University, Guiyang, Guizhou, China, 2023.
doi:10.27047/d.cnki.ggudu.2023.001627