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适合过程控制应用的高共模抑制比(CMRR)精密模拟前端
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2011-09-19
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Signal levels in industrial process control systems generally fallinto one of the following categories: single-ended current(4 mA-to-20 mA), single-ended, differential voltage (0 V to 5V,0 V to 10 V, ±5 V, ±10 V), or small signal inputs from sensorssuch as thermocouples or load cells. Large common-modevoltage swings are also typical, especially for small signaldifferential inputs; therefore good common-mode rejection isan important specification in the analog signal processingsystem.
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