A low-power bio-sensor interface with wide measurement range
A new low-power high dynamic range conductanceto- frequency converter, using relaxation oscillator approach, is proposed for bio-sensor interfacing applications. Enhanced by a leakage current compensation technique, the interface has immuni...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Conference Paper |
| Language: | English |
| Published: |
2010
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/90558 http://hdl.handle.net/10220/6380 |
| Summary: | A new low-power high dynamic range conductanceto-
frequency converter, using relaxation oscillator approach, is
proposed for bio-sensor interfacing applications. Enhanced by a
leakage current compensation technique, the interface has
immunity against input pad ESD leakage current as well as hum
noise. The output frequency is linear with respect to sensor
conductance, with the maximum systematic error of 0.58% and
average error of 0.46% for nanowire sensor resistance from 100
MΩ ~ 1 GΩ. For 2% systematic error, the resistance range of
the interfacing system can attain from 5 MΩ to 5 GΩ. The biosensor
interface is designed using CSM 0.18 μm CMOS
technology, which dissipates 37.2 μW at a single supply of 1.8V
and the maximum sensor current. |
|---|