Digital differential detection for touch sensors

A method for differential detection for capacitive sensors comprising:

• receiving a first modified input signal from a first node of a capacitive sensor;
• receiving a second modified input signal from a second node of the capacitive sensor;
• converting the first modified input signal to a first digital signal using a first analog-to-digital converter (ADC);
• converting the second modified input signal to a second digital signal using a second ADC;
• processing a result according to a first difference, wherein the first difference is calculated by subtracting the second digital signal from the first digital signal.

A receiver for digital differential detection comprising:

• a first input configured to receive a first modified input signal from a first node;
• a second input configured to receive a second modified input signal from a second node;
• a first analog-to-digital converter configured to convert the first modified input signal to a first digital signal;
• a second analog-to-digital converter configured to convert the second modified input signal to a second digital signal;
• a first differencing circuit configured to calculate a first difference between the first digital signal and a second digital signal by subtracting the second digital signal from the first digital signal;
• and
• a decision circuit configured to output a result according to the first difference.