Transcription of Chapter II - Analog Devices
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Chapter II - Analog Devices
2-1 Chapter IIINSIDE AN INSTRUMENTATION AMPLIFIERA Simple Op Amp Subtractor Provides an In-Amp FunctionThe simplest (but still very useful) method of implement-ing a differential gain block is shown in Figure 2-1. ! 2 K62 K62 K62 K62%&%2%.#%6/546). ).6%24).').0546)../.).6%24).').054! /0 6/54 6). n 6). nnn 2 2 &/2 2 2 2 2 Figure 2-1. A 1-op amp in-amp difference amplifier circuit functional block r1 = r3 and r2 = r4, thenVVV R2 R1 OUTIN2IN1= ()()Although this circuit provides an in-amp function, am-plifying differential signals while rejecting those that are common mode, it also has some limitations. First, the impedances of the inverting and noninverting inputs are relatively low and unequal. In this example, the input im-pedance to VIn1 equals 100 k , while the impedance of VIn2 is twice that, at 200 k . Therefore, when voltage is applied to one input while grounding the other, different currents will flow depending on which input receives the applied voltage.
2-2 This circuit provides matched, high impedance inputs so that the impedances of the input sources will have a minimal effect on the circuit’s common-mode rejection.
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