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Instrumentation Amplifier (OP08) Circuit With Differencial I

2015-01-04 16:00  
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Instrumentation Amplifier (OP08) Circuit With Differencial Input Pre-Amplifier
For the instrumentation amplifier of electronic measuring circuit, its input signal's amplitude peak may usually be a few mV. But the common-mode noise voltage level could be as high as a few volts. So the instrumentation amplifier's input drift, noise rejection and common-mode rejection ratio is significant for the amplifier's dynamic performance. At the same time the measured source's internal resistance could not be controlled. And the signal internal resistance's variation could make the amplifier's resistors mismatch, which connect respectively from the two input ports to ground. This mismatch could cause not only the change of the gain, but also cause the common-mode rejection ratio decreasing.