| commit | 0f7c70af5d080fd167a023554533459d380176cb | [log] [tgz] |
|---|---|---|
| author | Jorge Marin <jorge.marin.ndez@gmail.com> | Tue Mar 22 02:43:56 2022 -0300 |
| committer | Jorge Marin <jorge.marin.ndez@gmail.com> | Tue Mar 22 02:43:56 2022 -0300 |
| tree | b8097db01d88f866231810054f52b195edf08787 | |
| parent | b7e6a21e24ee2c70e2a3d6c0e8ef43c1c6ad03b1 [diff] |
MPW5, buff1n2
PLL-BASED CAPACITIVE SENSOR INTERFACE
This project involves the design of a capacitive sensor-to-digital converter using time-based circuit techniques. It uses basic digitally-oriented building blocks (two oscillators, a D-flipflop and a feedback loop including a capacitive element and a switch) to convert input capacitive values into digital single bit traces in the time domain. The basic block diagram can be seen below:
The architecture has been tested for a DC sweep of input capacitive values. Example output trace values for different capacitance inputs are shown below:
The characteristic plot for an average window of 10us is seen below:
Refer to README for this sample project documentation.