simplified resistance temperature circuit that improving the linear by using positive feedback

Published:2011/5/13 2:57:00 Author:Fiona | Keyword: improving the linear by using positive feedback | From:SeekIC

Circuit function This circuit is a temperature measurement which uses a positive feedback way and has a linearizer,if temperature rises, the current flows through RTD will increase,if the temperature range is 0 ~ 500 ° C, we can obtain 0 ~ 5V of Voltage output, the error can be controlled within plus or minus 0.08%. Circuit Work OP amplifier A1is the inverting amplifier, it connects with RTD in the feedback loop, when set side the constant current with 5MA currents, A1 output may have-0.5V voltage. Assume that the RTD's variation is △ R,the output voltage's variation is △ R * 5MA.



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