TDC (time-to-digital converter) capable of adjusting resolution ratio and ADPLL (all digital phase-locked loop) based on TDC

The invention discloses a TDC (time-to-digital converter) capable of adjusting a resolution ratio and an ADPLL (all digital phase-locked loop) based on the TDC. The ADPLL based on the TDC capable of adjusting the resolution ratio can adjust the resolution ratio according to a clock period (frequency) output by a DCO (digitally controlled oscillator), so that the requirement of the broadband output frequency can be met, and the defect that the traditional TDC is only applicable to a narrowband can be effectively overcome; meanwhile, for different resolution ratios, the power consumption of the TDC can be correspondently adjusted and reduced; compared with the structure adopting a Bang-Bang frequency discrimination phase discriminator in the prior art, the broadband ADPLL adopting the TDC can realize the fractional frequency synthesis, can improve the frequency discrimination and phase discrimination precision and the phase noise performance and can also realize low power consumption.