Datasheet

6
Document Version: 4.1 tacterion GmbH | Nymphenburger Straße 5 | 80335 Munich | Germany
Date: October 2021 Tel: [phone] | [e-mail] | www.tacterion.com
5. Readout Circuits
In the following two possible sensor readout circuits are suggested.
Note that all measurements presented in this datasheet were recorded using the EBS-10010
electronics, which is based on the voltage divider configuration.
a. Voltage divider
A voltage divider configuration is the simplest readout circuit to determine sensor resistance.
Given that R
ref
and V
in
are known, the sensor resistance R
sens
can be calculated by measuring the
voltage drop V
out
across the reference resistor R
ref
.
The output voltage can be expressed as:
V
out
=
V
in
ڄR
ref
R
ref
+R
sens
b. Transimpedance Amplifier (I-V converter)
A transimpedance amplifier (TIA) converts the current flowing through the sensor (V
in
/R
sens
) to a
voltage signal (V
out
), providing a more ideal transfer function than a voltage divider.
Under the assumption of an ideal op-amp, the output voltage is calculated as:
V
out
= -V
in
ڄ
R
F
R
sens