Time-to-digital converter and calibration

A time-to-digital converter (TDC) calibration method comprising:

• providing, by a controllable signal generator, multiple pairs of calibration signals having different known time differences to a TDC, each pair of calibration signals having a known time difference;
• receiving, by a calibration mapping circuit, a digital TDC output value for each pair of calibration signals;
• and
• storing, by the calibration mapping circuit, in a digital memory, a mapping value for converting the digital TDC output value to a corresponding digital time value associated with the known time difference.

A time-to-digital conversion method comprising:

• receiving, from a time-to-digital converter (TDC), a digital TDC output value based on two input signals having an unknown time difference;
• retrieving, from a digital memory, a mapping value corresponding to the digital TDC output value based on the digital TDC output value;
• and
• outputting a compensated digital time value based on the mapping value, wherein the compensated digital time value is representative of the unknown time difference between the two input signals.