TIME-TO-DIGITAL CONVERTER, FREQUENCY TRACKING APPARATUS AND METHOD

摘要

Embodiments of the present invention provide a time-to-digital converter, where the time-to-digital converter includes a delay unit, a first sampling unit, and a second sampling unit. The delay unit is connected to the first sampling unit and is configured to receive a first clock signal and delay the first clock signal; the first sampling unit is configured to perform sampling on the first clock signal and generate a first phase signal, so that a first phase-locked module adjusts a frequency of the first clock signal; the delay unit is further connected to the second sampling unit and is configured to receive a frequency-adjusted first clock signal and delay the frequency-adjusted first clock signal; and the second sampling unit is configured to perform sampling on the frequency-adjusted first clock signal and generate a second phase signal.

主权项

1. A time-to-digital converter, comprising a delay unit, a first sampling unit, and a second sampling unit, wherein
the delay unit is connected to the first sampling unit and is configured to: receive a first clock signal output by a first phase-locked module; and after delaying the first clock signal, output the first clock signal to the first sampling unit; the first sampling unit is configured to: perform, by using a reference clock signal, sampling on the first clock signal output by the delay unit; generate a first phase signal; and send the first phase signal to the first phase-locked module, so that the first phase-locked module adjusts a frequency of the first clock signal according to the first phase signal, and outputs a frequency-adjusted first clock signal to the delay unit; the delay unit is further connected to the second sampling unit and is configured to: receive the frequency-adjusted first clock signal output by the first phase-locked module; and after delaying the frequency-adjusted first clock signal, output the frequency-adjusted first clock signal to the second sampling unit; and the second sampling unit is configured to: perform, by using a second clock signal, sampling on the frequency-adjusted first clock signal output by the delay unit; generate a second phase signal; and send the second phase signal to the first phase-locked module by using a second phase-locked module, so that the first phase-locked module adjusts a phase of the first clock signal according to the second phase signal.