Lorem ipsum dolor sit amet, consectetur adipiscing elit. A receiver that samples at the wrong instant throws away signal-to-noise it already paid for. This tutorial wires a timing-error detector into a loop and watches it lock.
The eye diagram
Donec ullamcorper nulla non metus auctor fringilla. The open eye marks the best sampling instant; the loop’s job is to find it and stay there as the clock drifts.
Closing the loop
Maecenas faucibus mollis interdum. A Gardner detector estimates timing error from samples either side of the symbol; a loop filter integrates it back into the sampler phase.
- Pull-in: the loop drags the phase toward the eye center.
- Tracking: it rejects small clock drifts.
- Jitter: loop bandwidth trades speed against noise.
Cras mattis consectetur purus sit amet fermentum. Open the live lab below and nudge the sample phase to watch the loop pull it back.