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在精密仪用放大器（IA）中增加一个CMOS运算放大器INA1
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2009-06-06
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You can combine a precision instrumentation amplifier (IA)
and an inexpensive CMOS op amp to get the best of two
worlds—the precision of a bipolar IA and 5V single-supply
operation. Using the INA131 gives 50mV max voltage
offset, 0.25mV/°C max offset drift, and 110dB min commonmode
rejection. How close the output swings to the power
supply rail depends on which “rail-to-rail” CMOS op amp
you use. With a TI TL2272 you can expect the output to
swing within 100mV of the rails
and an inexpensive CMOS op amp to get the best of two
worlds—the precision of a bipolar IA and 5V single-supply
operation. Using the INA131 gives 50mV max voltage
offset, 0.25mV/°C max offset drift, and 110dB min commonmode
rejection. How close the output swings to the power
supply rail depends on which “rail-to-rail” CMOS op amp
you use. With a TI TL2272 you can expect the output to
swing within 100mV of the rails
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