Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6879149 | AEU - International Journal of Electronics and Communications | 2018 | 14 Pages |
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 0.18â¯Î¼m TSMC CMOS technology and supply voltage of ±0.9â¯V, show a 71â¯dB CMRR and a 85â¯MHz constant â3â¯dB bandwidth for differential-mode gain (ranging from 0â¯dB to 18â¯dB). The output impedance of the proposed circuit is 1.7â¯Î© and its power consumption is 770â¯ÂµW. The method introduced in this paper can also be applied to traditional circuits based on Op-Amp supply current sensing technique.
Keywords
Related Topics
Physical Sciences and Engineering
Computer Science
Computer Networks and Communications
Authors
Leila Safari, Shahram Minaei, Giuseppe Ferri, Vincenzo Stornelli,