Measurement system design of laser trimmer for chip resistor
Zhao Xin · 2003
In the process of laser trimming, it is required to measure the resistors accurately on line and in real time, then to realize automatic control of the process. The conventional method to measure resistor by voltagecurrent is not suitable for the dynamic measurement on line, although its accuracy is satisfied. A new technique is presented, which applies micro processor to active electric bridge, combines the flexibility of voltagecurrent method and the precision of operation amplifier. Therefore, an activedigital bridge with high precision is designed, which can meet the demand of engineering.