Thermal drift compensation of piezoresistive implantable blood pressure sensors with low cost analog solutions
Abstract
this paper reports on three low cost analog
solutions for compensating thermal drift of piezoresistive
implantable blood pressure sensors. Body temperature variations
distort blood pressure measurements due to pyroelectric effect.
It’s therefore indispensable to compensate thermal drift of the
used sensors. Compensating techniques should be low cost,
compact and have low consumption. We present in the paper
three thermal drift compensation techniques respectively based
on a current source LM334, negative temperature coefficient
thermistors and a combination of negative temperature
coefficient thermistors and a current source LM334. The first
compensation technique gives a lower thermal drift coefficient
(Vout/°C) than the two last techniques over a large pressure
range. The first and the second technique can cancel thermal
drift over different pressure ranges.