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.
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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