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An all-digital phase-locked loop low-noise digital phase detector based on adaptive kalman filter

An all-digital phase-locked loop and digital phase detector technology, applied in the direction of automatic power control, electrical components, etc., can solve the problem that the delay time cannot be infinitely small, and achieve the effect of reducing requirements and reducing the noise of the phase detector

Active Publication Date: 2022-05-10
SHANGHAI JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

The quantization noise of the TDC originates from the delay time of the delay unit of the TDC cannot be infinitely small, that is, due to its limited time resolution

Method used

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  • An all-digital phase-locked loop low-noise digital phase detector based on adaptive kalman filter
  • An all-digital phase-locked loop low-noise digital phase detector based on adaptive kalman filter
  • An all-digital phase-locked loop low-noise digital phase detector based on adaptive kalman filter

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Embodiment Construction

[0017] Such as figure 1 As shown, it is a kind of digital phase detector designed based on Kalman filter involved in this embodiment, including: variable phase accumulator 1, fixed phase accumulator 2, multiplier 3, adder 4, 5, retiming unit 6. A latch 7, an adaptive Kalman filter 8, a time-to-digital converter 9 and a delay unit 10, wherein: the variable phase accumulator and the fixed phase accumulator respectively receive the reference signal and the DCO output signal and accumulate the two Phase information, the digital-to-time converter receives the reference signal and the DCO output signal and outputs the absolute phase difference between the two, after dividing the estimated period by the first multiplier 3, the normalized phase difference is obtained, and then normalized with the normalized phase difference of the DCO output signal The phase observation value of the current cycle is obtained after adding the normalization phase The Kalman filter respectively receive...

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Abstract

An all-digital phase-locked loop low-noise digital phase detector based on an adaptive Kalman filter, comprising: a multi-segment adjustment all-digital phase-locked loop based on a phase accumulator and a multi-segment adjustment all-digital phase-locked loop for reducing Noise adaptive Kalman filter, wherein: the input end of the adaptive Kalman filter receives the DCO control word of the previous cycle and the phase information of the DCO output signal measured in the current cycle, and uses the estimated information of the quantization noise to perform filtering, thereby The phase information of the optimized DCO output signal is obtained. The invention optimizes the noise of each noise source of the all-digital phase-locked loop, and uses an adaptive Kalman filter to optimize the quantization noise of the TDC and the quantization noise of the DCO in the phase identification process, thereby reducing the noise component in the phase identification result , thereby optimizing the noise performance of the loop.

Description

technical field [0001] The invention relates to a technology in the field of digital signal processing, in particular to a design for optimizing the noise of a digital phase detector in an all-digital phase-locked loop by applying an adaptive Kalman filter. Background technique [0002] Under the all-digital phase-locked loop architecture, the phase noise of the phase-locked loop output generally comes from the quantization noise of the time-to-digital converter (TDC), the quantization noise of the digitally controlled oscillator (DCO) and the phase noise of the reference signal. The quantization noise of the TDC originates from the fact that the delay time of the delay unit of the TDC cannot be infinitely small, that is, it is caused by a limited time resolution. For this quantization noise, a TDC with a higher time resolution is selected, that is, a TDC with a smaller delay time of the delay unit is used to optimize the noise; the quantization noise of the DCO comes from t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/08H03L7/18
CPCH03L7/08H03L7/18
Inventor 吴可施尘玥叶炀涛金晶顾昌展周健军
Owner SHANGHAI JIAOTONG UNIV