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OPA727: 求大神解读下此电桥激励原理

Part Number: OPA727


 此电路是看一个外文资料上的电路图,现在已在产品上使用,上部是传感器组成惠斯通电桥,下部为何采用此种方式,既不是恒流也不是恒压,求大神解读一下