Which EMC (electromagnetic compatibility) devices are helpful for the design and modification of electronic thermometers?

The EMC design of electronic thermometers prioritizes simplicity and reliability. Thermistor measurements typically employ a constant current source and an ADC, requiring a stable constant current source and a clean ADC reference voltage (Vref). A decoupling capacitor is added to the Vref pin. For infrared forehead thermometers, the weak signal (mV level) output from the thermopile sensor needs to be amplified by a low-noise operational amplifier. The entire analog front-end area should be partially shielded on the PCB or surrounded by ground lines. The main control MCU should be a model insensitive to power supply noise, and the program should perform software filtering with multiple sampling and averaging. The device is typically battery-powered, with few sources of interference.