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许多物性型敏感器件常常需要低温漂、低时漂恒流源供电,有时为改善传感器的温度特性也需要变流源(工作电流随温度按一定规律变化)供电。习惯上多用半导体分立器件、运算放大器等构成恒流源以满足各类敏感器件的要求,但存在制作费时或体积较大、使用不便等
Many physical type sensitive devices often require low temperature drift, low drift constant current source power supply, and sometimes to improve the temperature characteristics of the sensor also need variable current source (working current changes with the temperature according to certain laws) power supply. Customary use of semiconductor discrete devices, op amps and other components constitute a constant current source to meet the requirements of various types of sensitive devices, but there is time-consuming production or larger, inconvenient to use