Hello,
Can I ask typical ranges of the *capacitance ratio* between the electrode C_touch (touch capacitance) and the C_electrode (electrode capacitance) ?
We assume a Self-capacitance electrode for a finger.
I have written which I could find:
(1) The linked page shows a bar graph. The left bar sounded to me that a good center value would be 25%.
(2) The linked page tells the C_touch would be 1-10pF.
(3) The linked page tells C_electrode example is 3-4pF.
(4) I tried to calculate the ratio:
- From (2): C_touch would be 1-10pF
- From (3): C_electrode example is 3-4pF
From the above, a good *capacitance ratio* might be from (1/4=25%) to (10/3=330%), but I was afraid the 25% - 330% would be a good or typical range.