This report is featured in the March 2013 issue of the Toyohashi Tech eNewsletter : http://www.tut.ac.jp/english/
Small instrumentation amplifier for high density arrayed sensor devices
Small-area, low-power, low-noise instrumentation amplifiers (IA) are critical components of arrayed sensor devices used for high-spatial-resolution biomedical and environment monitoring system.
However, in order to realize small offset voltages of IA, conventional IAs utilize analog filters¡ªcomposed of large passive components, resistors and capacitors¡ª resulting in excessively large silicon chips.
Now, Ippei Akita and colleague at Toyohashi University of Technology have developed a novel architecture for fabricating smaller sized integrated circuit chips. The technique is based on a digital calibration scheme for minimizing the offset voltage of the IA circuit, instead of an analog scheme used in conventional circuits.
The offset exists mainly at the first-stage circuit of IA. In this design, the researchers introduced a reconfigurable first-stage circuit. The best configuration for minimizing the offset was easily determined by calibration logic which was implemented in a small area compared to analog circuits.
The proposed IA was implemented in a standard 0.18 micrometer CMOS and resulted with an offset voltage of < 3.5 ¦ÌV while drawing a current of 194 ¦ÌA. The active area of the IA is 7.8 times smaller than conventional state-of-the-art chips while maintaining low noise and low power.
The researchers plan to use the proposed IA for the fabrication of an arrayed IA for high-spatial-resolution and real-time sensing systems.
About Toyohashi University of Technology:
Founded in 1976, Toyohashi University of Technology is a vibrant modern institute with research activities reflecting the modern era of advanced electronics, engineering, and life sciences.
About the Electronics-Inspired Interdisciplinary Research Institute (EIIRIS):
EIIRIS is Toyohashi Tech¡¯s new flagship research complex launched on 1st October 2010. "The aim of EIIRIS is to produce world-class innovative research," says President Yoshiyuki Sakaki. "To do this we are bringing together ambitious young researchers from diverse fields to collaborate on pioneering new frontiers in science such as brain/neuro-electronics as well as tackling some of the major issues mankind faces today: issues such as environmental changes and aging societies."
Authors: Ippei Akita and Makoto Ishida
Title of original paper: A 0.06mm2 14nV/¡ÌHz chopper instrumentation amplifier with automatic differential-pair matching.
Journal, volume, pages and year: IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers (ISSCC), pp.178-179, Feb. 2013
Affiliations: Department of Electrical & Electronic Engineering, Toyohashi University of Technology.
Department website: http://www.int.ee.tut.ac.jp/icg/
Further Reports about: EIIRIS > environment monitoring system > environmental change > high-spatial-resolution > information technology > sensor devices > silicon chip > Small instrumentation amplifier
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