| 摘要 |
<p>A capacitive sensing circuit having anti-electromagnetic interference capabilities. A filter is coupled to a capacitor to be measured, and receives multiple reference signals to generate a first filter signal and a second filter signal. A difference circuit receives the first filter signal and the second filter signal, and eliminates the common-mode noise of the first filter signal and the second filter signal to generate a difference signal, the size of the difference signal being related to the size of the capacitor to be measured, thereby enabling the measurement of said capacitor to be measured. The difference circuit eliminates the common-mode noise, thereby enabling anti-electromagnetic interference capabilities. Additionally, the difference circuit can regulate the output of the filter within a dynamic range, thereby enabling the capacitive sensing circuit with low number of consumption in clock cycles per instruction.</p> |
