A coarse delay-locked loop circuit and a delay control circuit

CN114567317BActive Publication Date: 2026-07-03XINSIYUAN 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
2026-07-03

AI Technical Summary

Technical Problem

Existing coarse delay phase-locked loop circuits are complex to design and may cause pulse loss, leakage, and logic output errors when the input pulse width is very narrow, resulting in inaccurate control and thus affecting the accuracy of high-precision delay control circuits.

Method used

A coarse delay phase-locked loop circuit was designed, comprising a frequency and phase detector, a first delay module, a delay link module, a charge pump, and a control module. The first delay module and the delay link module input a reference frequency under the same environment, and the frequency and phase detector and the charge pump generate a control voltage to ensure the consistency and accuracy of the delay signal path.

Benefits of technology

It improves the accuracy of delay range control, avoids pulse loss and logic output errors, and ensures the precision of high-precision delay control circuit.

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    Figure CN114567317B_ABST
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Abstract

This invention provides a coarse delay phase-locked loop (PLL) circuit and a delay control circuit. The delay control circuit includes a coarse delay PLL circuit, which comprises a frequency and phase detector, a first delay module, a delay link module, a charge pump, and a control module. The signal input terminal of the first delay module is connected to a reference frequency. Under the control voltage output by the charge pump, the first delay module outputs a first delay signal and a second delay signal. Under the control voltage output by the charge pump, the delay link module further delays the first delay signal to obtain a delay feedback signal. The control module generates an enable control signal for the frequency and phase detector based on the power supply voltage signal and an enable signal. Based on the control effect of the enable control signal, the frequency and phase detector outputs a phase difference signal based on the second delay signal and the delay feedback signal. The charge pump obtains the control voltage based on the phase difference signal. This invention can accurately control the delay range.
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