方案1：采用优质的增益电阻器 .......................................................................................................................5-7 方案2：采用固定增益的仪表放大器 ...............................................................................................................5-7 RTI和RTO误差 ..................................................................................................................................................5-7 失调误差 ..........................................................................................................................................................5-8 噪声误差 ..........................................................................................................................................................5-8 降低仪表放大器电路中的RFI整流误差 ............................................................................................................5-8 设计实用的RFI滤波器 ....................................................................................................................................5-8 用食谱式方法选择RFI ...........................................................................................................5-10 具体的设计案例 ............................................................................................................................................5-10 用于AD620系列仪表放大器的RFI抑制电路 ...............................................................................................5-10 用于微功耗仪表放大器的 RFI 抑制电路 .....................................................................................................5-11 用于AD623仪表放大器的RFI抑制电路 .......................................................................................................5-12 用于AD8225仪表放大器的RFI抑制电路 .....................................................................................................5-12 采用X2Y电容器的共模滤波器 .....................................................................................................................5-13 用于仪表放大器RFI滤波器的共模 RF扼流圈 ............................................................................................5-14 RFI测试 .............................................................................................................................................................5-15 采用低通滤波器提高信噪比 .............................................................................................................................5-15 外部调整CMR和建立时间 ...............................................................................................................................5-17 第Ⅵ章——仪表放大器与差分放大器的应用电路 ...........................................................................................6-1 复合仪表放大器电路具有优良的高频CMR .......................................................................................................6-1 采用AC激励的应变计测量 ................................................................................................................................6-2 AD628精密增益IC的应用 ..................................................................................................................................6-3 为什么使用一种增益IC ？..............................................................................................................................6-3 具有单极点LP滤波器的标准差分输入ADC缓冲器 ......................................................................................6-4 改变输出比例系数 ..........................................................................................................................................6-4 用一只外部电阻器设置AD628的0.1以下增益 ..............................................................................................6-4 具有双极点LP滤波的差分输入电路 ..............................................................................................................6-5 用AD628构成精密增益IC ..............................................................................................................................6-6 用AD628接成＋10或者－10精密增益 ...........................................................................................................6-6 用AD628接成＋11精密增益 .........................................................................................................................6-7 用AD628接成＋1精密增益.............................................................................................................................6-8 用前馈增加带宽提供－9.91增益 ....................................................................................................................6-8 iv 试选法选择RFI滤波器元件值 ...................................................................................................................5-10 电流变送器抑制接地噪声 ..................................................................................................................................6-9 高幅度模拟输入ADC接口 ...............................................................................................................................6-10 高速同相求和放大器 ........................................................................................................................................6-11 高电压监测电路 ................................................................................................................................................6-13 单电源高CMR电路 ..........................................................................................................................................6-13 48V总线精密监测电路 .....................................................................................................................................6-15 采用低端开关的高端电流检测 .........................................................................................................................6-16 采用高端开关的高端电流检测 .........................................................................................................................6-17 电桥应用 ............................................................................................................................................................6-17 标准电桥电路 ................................................................................................................................................6-17 单电源数据采集系统 ....................................................................................................................................6-18 低压降双极性电桥驱动器 .............................................................................................................................6-18 传感器接口的应用 ............................................................................................................................................6-19 医用心电图仪的应用 ........................................................................................................................................6-19 远程负载检测技术 ............................................................................................................................................6-21 精密电压电流转换器 ........................................................................................................................................6-22 电流传感器接口 ................................................................................................................................................6-22 输出缓冲低功耗仪表放大器 .............................................................................................................................6-23 4 mA～20 mA单电源接收器 ............................................................................................................................6-23 单电源热电偶放大器 ........................................................................................................................................6-24 专业音频产品 ....................................................................................................................................................6-24 第Ⅶ章——仪表放大器与现代ADC匹配 ..........................................................................................................7-1 计算对ADC分辨率的要求 ..............................................................................................................................7-1 ADI公司仪表放大器与现代ADC匹配 ...........................................................................................................7-2 高速数据采集 ..................................................................................................................................................7-4 用于高速数据采集的仪表放大器电路 ...........................................................................................................7-6 |
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