描述
用3.3V电压来激励电桥并驱动放大器。满量程电桥输出为±15mV,失调可能处于±25-mV的范围。为了取得所需灵敏度,放大器增益需为100,ADC的输入范围为0V至3.3V。由于电桥的输出可以为正,也可以为负,因此,其输出指向中间电源或1.65V。只需通过施加100的增益,失调本身即会强制使放大器输出处于-0.85V至+4.15V的范围内,这超过了电源轨。
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