Time-to-digit conversion device and digital phase-locked loop

Abstract

The invention is suitable for the technical field of time precision measurement and provides a time-to-digit conversion device and a digital phase-locked loop. The device comprises a power supply control circuit, a first delay circuit, a second delay circuit and a time detection circuit; the power supply control circuit generates a first voltage and a second voltage and transmits the first voltageand the second voltage to the first delay circuit and the second delay circuit respectively; the first delay circuit is used for carrying out delay processing on a received first clock signal according to the first voltage; the second delay circuit is used for carrying out delay processing on a received second clock signal according to the second voltage; the time detection circuit is used for receiving the first clock signal and the second clock signal obtained after delay processing, and the time difference between the first clock signal and the second clock signal is detected. According tothe device, different voltages are input into the two delay circuits so that the two delays can be different, and higher and more stable measurement precision is obtained; meanwhile, requirements ofa circuit technology and layout are reduced.

Description

technical field [0001] The invention belongs to the technical field of precise time measurement, and in particular relates to a time-to-digital conversion device and a digital phase-locked loop. Background technique [0002] With the reduction of the chip process size, the advantages of small area and low power consumption, the all-digital phase-locked loop will gradually replace the traditional phase-locked loop. Wherein, the time-to-digital conversion device realizes the detection of the phase difference between the output frequency and the reference frequency in an all-digital phase-locked loop. The detection of the phase difference is closely related to the detection of the time difference between signals, and the accuracy of the time-to-digital conversion device determines the frequency accuracy that the all-digital phase-locked loop can achieve. [0003] At present, the commonly used time-to-digital conversion device delays the oscillator clock signal by a unit by set...

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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a time-to-digital conversion device and a digital phase-locked loop to solve the problems in the prior art that the time measurement accuracy of the time-to-digital conversion device is not high and the requirements for circuit process and layout matching are high

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