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图中所示电路输出正比于温度的电流(4～20mA)。该电路工作电压8至40V。电路经调整后,PSR指标超过0.0003％/V,在-50℃到+150℃温度范围内精度可达±1％。IC1输出电压V_(TEMP)正比于温度变化使电路作为温度传感器,并相当于一个2.5V参考信号。V_(TEMP)在25℃时等于0.55V,温度系数为1.9mV/℃。微功耗,单电源运算放大器IC_2缓冲了V_(TEMP)端上的漏电流,该运放功耗电流不大于50nA,
The circuit shown in the figure outputs a current proportional to temperature (4 ~ 20mA). The circuit operating voltage 8 to 40V. After the circuit is adjusted, the PSR index exceeds 0.0003% / V, and the accuracy can reach ± 1% in the temperature range of -50 ℃ to + 150 ℃. IC1 output voltage V_ (TEMP) is proportional to the temperature changes make the circuit as a temperature sensor, and is equivalent to a 2.5V reference signal. V_ (TEMP) is equal to 0.55V at 25 ° C with a temperature coefficient of 1.9mV / ° C. Micropower, single-supply operational amplifier IC_2 buffer V_ (TEMP) side of the leakage current, the op amp current consumption of not more than 50nA,