A low-voltage low-power instrumentation amplifier based on supply current sensing technique |
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| Affiliation: | 1. Department of Electrical and Information Engineering, University of L''Aquila, Via Gronchi 18, L''Aquila, Italy;2. Department of Electronics and Communications Engineering, Dogus University, Acibadem, Kadikoy, 34722 Istanbul, Turkey;1. Division of Electronics and Communication Engineering, The Northcap University, Sector 23A, Gurugram, Haryana 122017, India;2. Department of Computer Science Engineering, Jamia Hamdard University, New Delhi, India;1. Le Quy Don Technical University, Hanoi, Viet Nam;2. Vietnam People’s Army Broadcast Center, Viet Nam;1. Dipartimento di Ingegneria dell’Informazione, University of Pisa, Via Caruso 16, I-56122 Pisa, Italy;2. CNR-IEIIT, Via Caruso 16, I-56122 Pisa, Italy;3. Sensichips srl, Via Delle Valli 46, 04011 Latina, Italy |
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| Abstract: | In this paper a new low-voltage low-power instrumentation amplifier (IA) is presented. The proposed IA is based on supply current sensing technique where Op-Amps in traditional IA based on this technique are replaced with voltage buffers (VBs). This modification results in a very simplified circuit, robust performance against mismatches and high frequency performance. To reduce the required supply voltage, a low-voltage resistor-based current mirror is used to transfer the input current to the load. The input and output signals are of voltage kind and the proposed IA shows ideal infinite input impedance and a very low output one. PSPICE simulation results, using 0.18 μm TSMC CMOS technology and supply voltage of ±0.9 V, show a 71 dB CMRR and a 85 MHz constant −3 dB bandwidth for differential-mode gain (ranging from 0 dB to 18 dB). The output impedance of the proposed circuit is 1.7 Ω and its power consumption is 770 µW. The method introduced in this paper can also be applied to traditional circuits based on Op-Amp supply current sensing technique. |
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| Keywords: | Instrumentation amplifier CMRR Op-Amp supply current sensing technique |
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