A method and a system for converting time intervals are provided. In one embodiment, the system comprises a first time-to-digital converter having a first resolution configured to convert a first time interval, a second time-to-digital converter having a second resolution configured to convert a second time interval, and a third time-to-digital converter having a third resolution and coupled to the first time-to-digital converter and the second time-to-digital converter, the third time-to-digital converter configured to convert a third time interval and a fourth time interval.