December 2003
Intermediate to advanced
320 pages
9h 28m
English
Content preview from Analog Interfacing to Embedded Microprocessor Systems, 2nd Edition
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Reversing the Inputs
In some applications, you need to reverse the inputs of the opamp. Figure A.2 shows a case
like this. Here, an opamp drives an NPN transistor (Q1) through a current-limiting
resistor, R1. The transistor collector drives a resistive load. You might use a circuit like
this if the load draws more current than the opamp can sink.
In this circuit, the junction of Q1 and the load is connected to the noninverting input of
the opamp, and the input is connected to the inverting input. This might look like the
opamp is operating open loop, but it really isn’t. The function of the inverting and
noninverting inputs is switched because Q1
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