A novel topology voltage-mode instrumentation amplifier based on CFOAs
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS, cilt.31, sa.2, ss.533-546, 2025 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 31 Sayı: 2
- Basım Tarihi: 2025
- Doi Numarası: 10.1007/s00542-024-05809-6
- Dergi Adı: MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Applied Science & Technology Source, Compendex, Computer & Applied Sciences, INSPEC
- Sayfa Sayıları: ss.533-546
- İstanbul Üniversitesi-Cerrahpaşa Adresli: Evet
Özet
This paper presents a new voltage-mode instrumentation amplifier circuit that employs two current-feedback operational amplifiers (CFOAs) and three grounded resistors. The ideal and non-ideal analyses of the proposed circuit are presented. SPICE simulations with 0.18 mu m TSMC CMOS process parameters are conducted to validate the theoretical analyses. The proposed circuit provides a high differential-mode gain (40 dB) and high bandwidth (23.13 MHz). Moreover, the common-mode rejection ratio (CMRR) is also high (60.23 dB), with a CMRR bandwidth of 1.07 MHz. The supply voltage is +/- 1.25 V, and the total power consumption is found to be low at 0.954 mW. The robustness of the circuit is confirmed through simulations, and its performance against Process-Voltage-Temperature (PVT) variations is also examined. A key advantage of the proposed circuit is its ability to be easily implemented using commercially available integrated circuits, such as the AD844, which underscores its practical superiority over current-mode designs in terms of simplicity and accessibility. Additionally, the proposed circuit has been experimentally tested using these commercially available ICs.