【经验】如何提高思瑞浦单位增益差分放大器TPA9151的共模抑制比?
某客户设计一款称重计量电路,需要一颗高精度的运算放大器来做信号放大,为了得到较高的测量精度,尽可能减少典型误差源(例如失调和增益误差,以及噪声、容差和漂移)。为此,需要使用高精度运算放大器。客户选用的思瑞浦的TPA9151单位增益差分放大器,本文帮助客户通过外围电路设计来提高共模抑制比。
传统的差分电路应用如下:
如果我们需要通过外围电路来调整CMRR,放大器电路的外部元件选择就显得重要,尤其是电阻,它们应该具有匹配的比值,而不能任意选择。
理论情况下,我们要求其比值应相同 (R2/R1 = R4/R3)。这些比值有任何偏差都将导致不良的共模误差。然而在实际情况下实际使用中传统电阻的阻值并不恒定。它们会受机械负载和温度的影响。
因此我们建议:
根据需求的不同,可以使用具有不同容差的电阻或匹配电阻对(或网络),其大部分使用薄膜技术制造并具有精确的比值稳定性。利用这些匹配的电阻网络,可以大幅提高放大器电路的整体 CMRR。如下图所示
所以我们在设计差分放大电路时必须根据差分放大器电路的精度要求仔细选择外部电阻电路,以便实现系统的高性能。
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加工精度:精密平面磨床正负0.002;铣床正负0.02,ZNC放电正负0.01。CNC加工材料:铝、钢、聚合物等材料。专注于半导体行业、医疗器械、汽车行业、新能源行业、信息技术行业零部件加工。
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可加工PCB板层数:1~30层,板材类型:单双面板/多层板/HDI盲埋孔板/高频高速板/微波射频天线板/高精度阻抗板/厚铜板/微波FR4/耐腐蚀光模块PCB等,成品尺寸:5*5cm~58*70cm; 板厚0.2~6mm。
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