伺服系统位置反馈采集电路误差分析

针对伺服系统位置反馈采集电路硬件的筛选要求，确定采集电路对典型电压值的采集误差范围，在批量生产中尽早剔除有硬件缺陷的产品。位置反馈采集电路主要由运放跟随电路、模数转换电路、电压基准电路等模块组成。分别计算各个模块引入的最大采集理论误差，综合测试设备的测试误差得到系统对典型电压+2.5 V最大采集误差为25 LSB。最后，举例说明在电路板交付中，该筛选方法可以成功剔除硬件故障产品，测试误差范围有效，能有效地避免故障件流入后续装配工段。

Error analysis of position feedback acquisition circuit in servo system

As for the screen test requirement of control circuit hardware in servo system, analyses and determines the sampling error of the position feedback acquisition circuit for the typical value, in order to eliminate failure products in batch production. The position feedback acquisition circuit mainly consists of an operational amplifier follower,an A/D converter and voltage references modules. The sampling errors of the above three modules for 2.5 V are calculated respectively, combined with the error of test equipment, consequently the maximum sampling error of the hardware circuit is 25 LSB. Finally, the test error range is effective and accurate, the screen method can eliminate defective products in circuit boards delivery and avoid fault products into next section, that were illustrated by examples.