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Time-to-digital converter and conversion method

A time-to-digital conversion and time-to-digital technology, which is applied in time-to-digital converters, electrical unknown time interval measurement, devices for measuring time intervals, etc., can solve the problems of increasing design complexity and difficulty, increasing chip area, etc., and achieve benefits The effects of on-chip implementation, wide versatility, and excellent portability

Active Publication Date: 2020-04-28
SOUTHEAST UNIV
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Problems solved by technology

This circuit can greatly improve the resolution of TDC, but it also needs to add an analog-to-digital converter (ADC) for assistance, which will increase the complexity and difficulty of the design and increase the chip area

Method used

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  • Time-to-digital converter and conversion method
  • Time-to-digital converter and conversion method

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Embodiment Construction

[0039] This embodiment provides a time-to-digital converter, such as image 3 As shown, it includes a delay chain module 100 and an encoding circuit module, the delay chain module is used to quantize the error between the feedback signal and the reference clock signal, and sends the quantized value output to the encoding circuit module at the rising edge of each reference clock signal ; The encoding circuit module is used to process the output of the delay chain module, and convert it into a decimal number with a fixed bit width and a right bit through an all-digital logic circuit.

[0040] Wherein, the delay chain module 100 includes N stages of delay units connected in turn, the i-th stage delay unit includes a delay buffer Bi and a D flip-flop Di, and the input end of the delay buffer Bi is connected to the upper stage delay buffer B(i -1), if there is no upper-level delay buffer B(i-1), the feedback signal is input, the output end of the delay buffer Bi is connected to the...

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Abstract

The invention discloses a time-to-digital converter and a conversion method. The time-to-digital converter comprises a delay chain module which is used for carrying out quantification of an error between a feedback signal and each reference clock signal and transmitting a quantification value to a coding circuit module at the rising edge of each reference clock signal; and the encoding circuit module which is used for processing the output of the delay chain module and converting the output of the delay chain module into a decimal with fixed bit width and authority through an all-digital logiccircuit. The structure and design are simpler, the efficiency is higher, the transportability is higher, and the chip area is smaller during implementation.

Description

technical field [0001] The invention relates to integrated circuit design, in particular to a time-to-digital converter and a conversion method. Background technique [0002] A time-to-digital converter is a device that converts a time interval into a digital signal and can be used to measure the phase difference between two input signals. [0003] Chinese patent: CN10727239 5A, 2017.10.20" (reference 1) discloses a time-to-digital converter and its conversion method, such as figure 1 As shown, the time-to-digital converter includes: a time-to-digital conversion unit, which is used to digitally convert the first input or the second input, and the first input is a time interval; a time margin extraction unit, which is used to extract the time-to-digital conversion unit. The time margin that is less than the clock period and has not been converted after the time interval, the time margin is from the end of the time interval to the first rise of the clock signal thereafter; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04F10/00
CPCG04F10/005
Inventor 唐路朱亚青张有明唐旭升杨阳万世松
Owner SOUTHEAST UNIV
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