Voltage-control ring vibration type two-section type time digital conversion circuit based on DLL

A two-stage, ring-vibration technology, applied in automatic power control, electrical components, etc., to achieve the effects of reducing data errors, improving quantization accuracy, and reducing area

Inactive Publication Date: 2015-01-21
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For a single TDC, it is impossible to take into account or meet the common requirements of time measurement range and measurement accuracy at the same time. In order to take into account the common requirements of measurement range and accuracy and expand the dynamic range of time measurement, TDC must adopt different properties based on counting and phase resolution. Segmented system structure with more than two segments

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  • Voltage-control ring vibration type two-section type time digital conversion circuit based on DLL
  • Voltage-control ring vibration type two-section type time digital conversion circuit based on DLL
  • Voltage-control ring vibration type two-section type time digital conversion circuit based on DLL

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Embodiment Construction

[0028] The present invention will be further explained below in conjunction with the accompanying drawings.

[0029] Such as figure 1 As shown, a two-stage digital time converter based on delay chain phase-locked loop control, including low-stage configurable ring oscillator TDC based on clock cycle phase resolution, high-stage counting TDC, delay chain phase-locked loop (DLL) , decoding circuit and latch. The low-stage configurable ring oscillator TDC includes a voltage-controlled ring oscillator unit composed of N-level delay units; figure 2 As shown, the high-segment counting TDC includes a 7-bit pseudo-random sequence LFSR counter. The delay chain phase-locked loop adopts a closed-loop delay line structure, and its voltage-controlled delay chain (VCDL) is 16 stages. The delay chain phase-locked loop is connected to the external reference clock REF, and the delay time of the voltage-controlled ring oscillator unit is regulated by the voltage-controlled voltage Vctrl out...

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Abstract

The invention discloses a voltage-control ring vibration type two-section type time digital conversion circuit based on a DLL. TDC conversion with rough counting measuring and fine counting distinguishing is used in digital quantization of a tested time period. Delay time of a voltage-control delay unit is adjusted and controlled by the stage number a delay unit in a delay chain and the DLL. Under control of the DLL, a high-frequency stable clock is generated in a voltage-control ring vibration mode, multi-digit pseudorandom sequence LFSR counting is driven, and the function of rough counting measuring is achieved. High-section rough counting TDC has the effect of conversion range expanding, meanwhile, an N-stage voltage-control delay ring vibration structure is modulated by the DLL, by distinguishing of the evenly-distributed phases of nodes in a loop, rough measuring TDC quantization error time is subjected to fine quantization, and accordingly quantization accuracy is improved. A built-in identical-frequency redundancy coding processing mode is used in the low-band TDC, so that the common requirements of area lowering and data error code reducing are met at the same time.

Description

technical field [0001] The invention relates to a digital time converter, in particular to a DLL-based voltage-controlled ring vibration type two-stage time-to-digital conversion circuit. Background technique [0002] The Time-to-Digital Converter (TDC) circuit is used to complete the function of precise time measurement, that is, to measure the time interval between two asynchronous signals or pulse duration, and convert the analog signal carrying time information into a digital signal , and then complete the digital processing of the sampled and quantized time signal. The core requirement of time measurement is to improve the time detection resolution in a specific measurement range, so the key to TDC design is to improve the dynamic range of time measurement. At present, TDC technology is widely used in aerospace, deep space communication, satellite launch and monitoring, geological surveying and mapping, navigation communication, power transmission and scientific measur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/08H03L7/099
Inventor 吴金宋科畅灵库姚群孙东辰郑丽霞孙伟锋高新江张秀川
Owner SOUTHEAST UNIV
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