Analog acquisition circuit

Published:2011/6/19 2:11:00 Author:John | Keyword: Analog acquisition | From:SeekIC

The main features that the analog front-end system is the sensor, which sent the standard signal (ie, 4mA ~ 20mA). This design has certain versatility. As long as the front-end connection is with different sensors, different signal sources can be collected. As the reference for the A / D converter is voltage, which refers that the reference source is the voltage, the A / D achieves voltage conversion. Such requires the conversion from a current signal to a voltage signal. The picture shows the concrete analog acquisition circuit. It can be seen from the figure that the acquisition circuit convert a current signal into a voltage signal through a resistor. In order to improve the progress of collection, high-precision resistors are needed. Resistors with 1% precision is used here.



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