Method and device for measuring time intervals

1. A device comprising:

at least one delay path for propagating at least one timing event, the delay path including a plurality of delay elements; and

a plurality of injection points provided along the delay path, each of the injection points being provided at a respective portion of the delay path located between two of the delay elements and not co-located with a delay element, and the injection points being configurable to receive the at least one timing event and to deliver the at least one timing event to the delay path.

2. The device of claim 1 further comprising a counter unit coupled to the delay path, the counter unit configurable to measure, in response to multiple timing events, multiple time intervals.

3. The device of claim 1 further comprising a selection unit coupled to the plurality of injection points, the selection unit being configurable to select one of the injection points for receiving a new timing event.

4. The device of claim 3 wherein the selection unit selects an injection point based on a current position of a timing event propagating in the delay path.

5. The device of claim 4 further comprising a plurality of checkpoints provided along the delay path and coupled to the selection unit to monitor the current position of any propagating timing events.

6. The device of claim 1 wherein the delay path includes a portion comprising at least one partial reset zone, and wherein the at least one partial reset zone is reset in response to a reset signal.

7. The device of claim 1 wherein the plurality of delay units are coupled in a ring configuration.

8. The device of claim 2 wherein the counter unit comprises a switching unit coupled to a plurality of counters, and wherein the switching unit directs the at least one timing event to its respective counter.

9. The device of claim 1 further including a plurality of taps provided along the delay path.

10. The device of claim 1 wherein at least one of the plurality of injection points comprises a pulse generator.

11. The device of claim 1 wherein at least one of the plurality of injection points comprises a pulse generator with at least two inputs, each input operable to create a pulse at the output of the pulse generator.

12. The device of claim 11 wherein the pulse generator is directly embedded in the delay path.

13. The device of claim 11 wherein the pulse generator receives one trigger signal from the delay path.

14. The device of claim 11 wherein the pulse generator receives a trigger signal from a delay element of the plurality of delay elements.

15. A time-to-digital converter comprising:

at least one delay path for propagating at least one timing event;

a plurality of injection points provided along the delay path, the injection points being configurable to receive the at least one timing event and to deliver the at least one timing event to the delay path;

a counter unit coupled to the delay path, the counter unit configured to measure, in response to the at least one timing event, at least one time interval, the counter unit comprising a switching unit coupled to a plurality of counters, wherein the switching unit directs the at least one timing event to a respective counter associated with the at least one timing event; and

a selection unit coupled to the plurality of injection points, the selection unit being configurable to select one of the injection points for receiving a new timing event based at least in part on a current position of a timing event propagating in the delay path.

16. The time-to-digital converter of claim 15 wherein the delay path comprises first and second partial reset zones, wherein the first partial reset zone is reset in response to a first reset signal and the second partial reset zone is reset in response to a second reset signal.

17. The time-to-digital converter of claim 15 wherein the delay path comprises a plurality of delay units coupled in a ring configuration.

18. A method of measuring at least one time interval, comprising:

propagating at least one first timing event in a delay path;

monitoring a position of the first timing event;

selecting at least one injection point provided along the delay path based on the position of the first timing event;

applying a second timing event to the selected injection point without interfering with the first timing event;

propagating the second timing event in the delay path; and

generating at least one binary word in response to a stop signal, wherein the binary word is representative of a particular time interval being measured.

19. The method of claim 18 wherein monitoring the position of the first timing event comprises monitoring a plurality of checkpoints provided along the delay path.

20. The method of claim 18 further comprising resetting a portion of the delay path after a new timing event is injected.

21. The method of claim 20 wherein resetting the portion of the delay path comprises removing at least one timing event from the delay path.

22. The method of claim 20 wherein resetting the portion of the delay path does not affect at least one timing event in the delay path.

23. The method of claim 18 wherein generating the at least one binary word in response to the stop signal comprises generating first and second binary words in response to the stop signal, and wherein the first binary word is responsive to a first time interval and the second binary word is responsive to a second time interval.