27 Tiny Phase/Frequency Detector
27 : Tiny Phase/Frequency Detector
- Author: argunda
- Description: Detect phase shifts between 2 square waves.
- GitHub repository
- Clock: 0 Hz
How it works
This is one of the blocks of a phased locked loop. The inputs are a reference clock and feedback clock and the outputs are the phase difference on either up or /down pin.
How to test
If the phase of the feedback clock is leading the reference clock, the up signal should show the phase difference. If it's lagging, the down signal will show the difference.
External hardware
Signal generators for square wave inputs.
IO
| # | Input | Output |
|---|---|---|
| 0 | reference clock | up |
| 1 | feedback clock | (inverted) down |
| 2 | active-low reset | |
| 3 | ||
| 4 | ||
| 5 | ||
| 6 | ||
| 7 |