AN 769: Intel FPGA Remote Temperature Sensing Diode Implementation Guide

ID 683139
Date 4/06/2022

3.4. Differential Input Capacitor

The capacitor (CF) on P and N pins acts like a low-pass filter that helps to filter the high frequency noise and improve the electromagnetic interference (EMI).

You must be careful during capacitor selection because the large capacitance can affect the rise time of the switched current source and introduce a huge measurement error. Typically, the temperature sensing chip manufacturer provides the recommended capacitance value in their data sheet. Refer to the capacitor manufacturer's design guidelines or recommendation before you decide the capacitance value.

Figure 5. Differential Input Capacitance

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