Innovative amplifiers for biomedical and environment monitoring systems

Mar 05, 2013
Innovative amplifiers for biomedical and environment monitoring systems

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—composed of large passive components, resistors and capacitors— resulting in excessively large .

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 .

The proposed IA was implemented in a standard 0.18 CMOS and resulted with an offset voltage of < 3.5 μV while drawing a current of 194 μA. 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.

Explore further: Vatican's manuscripts digital archive now available online

More information: Akita, I. and Ishida, M. A 0.06mm2 14nV/√Hz chopper instrumentation amplifier with automatic differential-pair matching. IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers (ISSCC), pp.178-179, Feb. 2013.

add to favorites email to friend print save as pdf

Related Stories

Gastro illness in infancy linked to islet autoimmunity

Oct 14, 2012

(HealthDay)—Gastrointestinal illnesses are associated with increased risk of islet autoimmunity (IA) among children who are exposed to wheat or barley either early or late in infancy, according to a study ...

G299.2-2.9, a middle-aged supernova remnant

Oct 13, 2011

(PhysOrg.com) -- G299.2-2.9 is an intriguing supernova remnant found about 16,000 light years away in the Milky Way galaxy. Evidence points to G299.2-2.9 being the remains of a Type Ia supernova, where a white ...

One supernova type, two different sources

May 07, 2012

The exploding stars known as Type Ia supernovae serve an important role in measuring the universe, and were used to discover the existence of dark energy. They're bright enough to see across large distances, ...

Recommended for you

Facebook sues law firms, claims fraud

9 hours ago

Facebook is suing several law firms that represented a man who claimed he owned half of the social network and was entitled to billions of dollars from the company and its CEO Mark Zuckerberg.

IBM 3Q disappoints as it sheds 'empty calories'

9 hours ago

IBM disappointed investors Monday, reporting weak revenue growth again and a big charge to shed its costly chipmaking division as the tech giant tries to steer its business toward cloud computing and social-mobile ...

User comments : 0