US Patent 11522549 Time-to-digital converter and signal alignment method using the same

A TDC (Time-To-Digital Converter) includes: a DLL (Delay Locked Loop) to delay a stop signal applied from an external element and to output a multi-phase signal; a synchronizer to synchronize the stop signal with a clock signal by using the multi-phase signal, and to output a synchronized stop signal; a counter to output a counter value by using the synchronized stop signal applied from the synchronizer; and a time information calculator to calculate time information of the stop signal based on the counter value and the multi-phase signal.