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Automating Manufacturing Systems - Process Control and ...

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continuous sensors - 23.36<br />

The circuit in Figure 23.36 will convert a differential (double ended) signal to a<br />

single ended signal. The two input op-amps are used as unity gain followers, to create a<br />

high input impedance. The following amplifier amplifies the voltage difference.<br />

-<br />

+<br />

Vin<br />

-<br />

+<br />

Vout<br />

-<br />

+<br />

CMRR<br />

adjust<br />

Figure 23.36<br />

A Differential Input to Single Ended Output Amplifier<br />

The Wheatstone bridge can be used to convert a resistance to a voltage output, as<br />

shown in Figure 23.37. If the resistor values are all made the same (<strong>and</strong> close to the value<br />

of R3) then the equation can be simplified.

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