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Automating Manufacturing Systems - Process Control and ...

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continuous sensors - 23.35<br />

+V<br />

Ro<br />

offset<br />

Rf<br />

Rg<br />

-V<br />

gain<br />

Vin<br />

Ri<br />

-<br />

+<br />

Vout<br />

R f<br />

+<br />

⎛<br />

R g ⎞ V out<br />

= ---------------- Vin + offset<br />

⎝<br />

R i<br />

⎠<br />

Figure 23.34<br />

A Single Ended Signal Amplifier<br />

A differential amplifier with a current input is shown in Figure 23.35. Note that Rc<br />

converts a current to a voltage. The voltage is then amplified to a larger voltage.<br />

Iin<br />

Rc<br />

R1<br />

R2<br />

-<br />

+<br />

Rf<br />

Vout<br />

R3<br />

R4<br />

Figure 23.35<br />

A Current Amplifier

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