Rapidly-adaptive all-digital phase-locked loop and design method thereof

An all-digital phase-locked loop, self-adaptive technology, applied in the field of electronics, can solve the problems of increasing phase jitter, compromise, system stability deterioration, etc. Effect

CN104954016AInactive Publication Date: 2015-09-30NANHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-09-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a rapidly-adaptive all-digital phase-locked loop and a design method thereof. The rapidly-adaptive all-digital phase-locked loop comprises a digital phase discriminator, a digital filter, a numerically-controlled oscillator and an adaptive controller, wherein the digital phase discriminator is used for subjecting an input signal ui and an output signal uo fed back to the input end of the phase-locked loop to phase discrimination and transmitting a phase error signal e reflecting the input signal and the output signal to the digital filter and the adaptive controller, the adaptive controller is used for generating a corresponding control signal c according to input signal frequency change and the phase error signal and transmitting the control signal c to the digital filter, the digital filter is capable of changing intrinsic parameters of the phase error signal and the control signal after receiving the phase error signal and the control signal, and generates a control signal N, and the numerically-controlled oscillator is used for adjusting frequency and phase of the output signal of the phase-locked loop, so that the all-digital phase-locked loop can be locked rapidly.
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Description

technical field

[0001] The invention belongs to the field of electronic technology, and relates to a fast adaptive all-digital phase-locked loop and a design method thereof. Background technique

[0002] In recent years, scholars at home and abroad have conducted extensive research on all-digital phase-locked loops for various purposes, and many novel phase-locked loop structures have emerged as the times require. At the same time, the on-chip phase-locked loop with high performance and versatility has been deeply researched. Among them, the more representative research work mainly includes: Shan Changhong and others proposed a fast all-digital phase-locked loop with automatic modulus control, in which the modulus of the digital loop filter can be automatically adjusted according to the size of the phase error. Adjustment, to achieve real-time control of the loop bandwidth, effectively solve the contradiction between the capture speed and anti-noise performance; After a de...

Examples

Embodiment Construction

[0030] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] 1. Design of digital phase detector

[0032] figure 1 It is a schematic diagram of the structure of a fast adaptive all-digital phase-locked loop. An adaptive controller is added to the all-digital phase-locked loop, and the circuit structure of the digital phase detector and digital filter is improved, so that the phase-locked loop can dynamically adjust By adjusting the control parameters, the phase-locking speed is improved, the phase-locking range is expanded, and the stability of the phase-locking system is enhanced. It overcomes the defects caused by the fixed and non-dynamic adjustment of the traditional all-digital phase-locked loop control parameters.

[0033] figure 2 It is the structure diagram of the digital phase detector. It consists of two synchronous shift rising edge detection mo...