Fine delay-locked loop circuit and delay control circuit

By using a fine-delay phase-locked loop circuit to delay the rising and falling edges of the input signal, and combining this with the enable signals of the control module and the frequency and phase detector, the problem of inaccurate control of the delay phase-locked loop circuit in the prior art is solved, and high-precision in-phase delay signals and precise control are achieved.

CN114567319BActive Publication Date: 2026-06-26XINSIYUAN MICROELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XINSIYUAN MICROELECTRONICS CO LTD
Filing Date
2022-02-21
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing fine-delay phase-locked loop circuits have insufficient control accuracy, especially when the initial delay deviation is present, which can easily cause the control voltage to change in the wrong direction and fail to lock.

Method used

A fine-delay phase-locked loop circuit was designed. The rising and falling edges of the input signal are delayed by a delay link module, and an enable control signal is generated by a control module to control the frequency and phase detector. Finally, the control voltage of the delay control link is adjusted under the action of the phase loop to achieve the two delayed signals being in phase.

Benefits of technology

It achieves precise control of the delay signal, ensuring a delay accuracy of 10ps, adapting to the pulse width variation of high-frequency signals, and avoiding problems such as signal loss and control voltage error lock-up.

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    Figure CN114567319B_ABST
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Abstract

The application provides a fine delay-locked loop circuit and a delay control circuit, the delay control circuit comprising the fine delay-locked loop circuit, the fine delay-locked loop circuit comprising a delay link module, a phase frequency detector, a charge pump and a control module, a first delay branch of the delay link module being used for performing delay control on a rising edge signal under the action of a control voltage output by the charge pump to output a first delay signal, a second delay branch being used for performing delay control on a falling edge signal under the action of the control voltage output by the charge pump to output a second delay signal; the control module being used for generating an enable control signal for controlling the phase frequency detector according to a power voltage signal and an enable signal, so that the phase frequency detector outputs a phase difference signal according to the second delay signal and a delay feedback signal; and the charge pump being used for obtaining the control voltage according to the phase difference signal. The application can realize precise control on delay precision.
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