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Using Single-Supply Op-Amps for Microcontroller Projects

An application note on how to implement an embedded system circuit with single-supply operational amplifiers.

Operational amplifiers are considered one of the building blocks of electronic circuits. In this note, the author describes the basic op-amp circuits with single-supply. But what we are more interested is the design of a single-supply op-amp circuit for temperature measurement.

An example of such circuit is shown below:

single supply op-amp circuit for temperature measurement

In this circuit, a PT100 is used to measure temperature. Such sensor needs current excitation, thus a current-source op-amp configuration is used. Moreover, gain and anti-aliasing circuits are also provided. The conditioned sensor signal is fed to a 12-bit ADC and then read by an 8-bit microcontroller.

Full Application Note:


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