Resistance/voltage transform circuit

Published:2011/7/5 8:21:00 Author:Lucas | Keyword: Resistance/voltage transform | From:SeekIC

This circuit is actually a resistance meter, which can directly indicate resistance. A2 is an inverting amplifier, and Rx is connected in the feedback loop. If the offset voltage and input bias current source can be ignored, the A2 output voltage U. =- UR (Rx / Rs), and it can find Rx = Rs /-URo to select the reference resistor Rs to get a fixed reference voltage, then the output voltage U. is the measured resistance, which can be directly read out. Rs is divided in the range of 2OOΩ -2MΩ with the unit in 10 times, and converted into 0-2V voltage output.



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