Design of temperature compensation circuit based on constant current source
Sensors generally employ metals or semiconductors as their sensitive components.When semiconductor materials are subjected to external optical or thermal stimuli,their electrical conductivity undergoes significant changes,leading to temperature drift in the sen-sor's output signals.This temperature drift severely impacts the measurement accuracy and application scope of sensors.To enhance their temperature ability,temperature compensation is essential.Due to factors such as the piezoresistive coefficient being influenced by temperature,pressure sensors exhibit temperature drift,and the temperature sensitivity coefficient is typically negative.The design em-ploys a constant current source with a positive temperature coefficient as the excitation driver for the sensor.The wheatstone bridge,af-ter being compensated through series and parallel resistance methods,is then utilized to perform sensitivity temperature compensation on the sensor.Experimental results demonstrate that after undergoing compensation from this two-stage circuit,piezoresistive pressure sensors display stabilized output signals within a range of-50 ℃ to 75 ℃,with an error reduced to less than 0.35％FS.This approach effectively mitigates the impact of temperature drift,thereby enhancing the sensor's overall performance and reliability across a broader temperature spectrum.
constant current sourcesensortemperature drifttemperature sensitivity coefficientthe compensation circuit
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