Time-to-digital converter (TDC) with improved resolution

The inention relates to time-to-digital converter (TDC) with improved resolution. A time-to-digital converter (TDC) with fine resolution of less than one inverter delay is described. In an exemplary design, the TDC includes first and second delay paths, a delay unit, and a phase computation unit. The first delay path receives a first input signal and a first reference signal and provides a first output. The second delay path receives a second input signal and a second reference signal and provides a second output. The delay unit delays the second input signal relative to the first input signal or delays the second reference signal relative to the first reference signal, e.g., by one half inverter delay. The phase computation unit receives the first and second outputs and provides a phase difference between the input signal and the reference signal. Calibration may be performed to obtain accurate timing for the first and second delay paths. 本发明涉及具有改进的分辨率的时间-数字转换器(TDC)。本发明描述种具有小于个反相器延迟的精细分辨率的时间-数字转换器TDC。在示范性设计中