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A phase detection circuit for time-to-digital converter

A phase detection, time digital technology, applied in the direction of electrical components, automatic power control, etc., can solve the problems of digital decoding circuit design and programming difficulties, affecting the accuracy of time-to-digital conversion, complex input conditions, etc., to reduce design difficulties, reduce Small area, easy to achieve effect

Active Publication Date: 2016-01-20
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, for the input of the subsequent decoding circuit (s[31:0] or e[31:0]), there will be multiple high levels at the same time, which will bring more complicated input situations, so It will bring design and programming difficulties to the digital decoding circuit, and it will also increase the area of ​​the circuit and affect the accuracy of time-to-digital conversion

Method used

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  • A phase detection circuit for time-to-digital converter
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  • A phase detection circuit for time-to-digital converter

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Embodiment Construction

[0020] A phase detection circuit for a time-to-digital converter of the present invention will be further specifically described below in conjunction with the accompanying drawings.

[0021] Such as image 3 As shown, a phase detection circuit for a time-to-digital converter of the present invention adds a rising edge detection circuit to the traditional phase detection circuit: the input signals A, B, and C are three continuous phase sampling signals, which are generated by the traditional phase detection circuit. Pulse current record signal c, pulse start position record signal S, pulse end position record signal E, but at this time the S record signal and E record signal are continuous rising edge signals, and they are sent to two rising edges of the same structure The detection module generates a pulse start position recording signal s and an end position recording signal e corresponding to the unit clock width.

[0022] Figure 4 It is the structure diagram of the risin...

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Abstract

The invention provides a phase detection circuit for a time-to-digital converter. The phase detection circuit adds a rising edge detection circuit to the traditional phase detection circuit, and the rising edge detection circuit samples the continuous high level twice in a row to obtain a pulse with a unit clock width, so that the subsequent decoding circuit 32 Only one of the input ports is at a high level at any time, thereby reducing the design difficulty of the decoding circuit, reducing the area of ​​the circuit, and improving the performance of the circuit and the accuracy of the time-to-digital conversion. The phase detection circuit of the invention is very simple and easy to implement, and has good application prospects.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, in particular to a phase detection circuit for a time-to-digital converter. Background technique [0002] Time Digital Converter (TimeDigitalConverter, TDC) is a commonly used circuit for time measurement. It mainly calculates the time from the reference signal to the occurrence of the event and the time interval between two pulses, and directly converts the time interval into a high-precision digital value. And realize the digital output. At present, it has been widely used in the electronic field, such as in the all-digital phase-locked loop ADPLL, to improve the time characteristics of its test devices and signals. In recent years, the most concerned TDC is the structure using high-speed CMOS digital circuits, the main reason is that the signal to be tested can achieve high time accuracy. Research on the accuracy of TDC will benefit the application and quality assurance of TDC. [0...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/085
Inventor 张长春张陆李卫郭宇锋方玉明
Owner NANJING UNIV OF POSTS & TELECOMM