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Metastable state detection circuit suitable for high-speed comparator

A high-speed comparator and detection circuit technology, applied in the direction of electronic circuit testing, etc., can solve the problems of large delay time, long extra delay, and limited metastable detection accuracy, and achieve high detection accuracy and delay short time effect

Active Publication Date: 2022-04-12
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

For high-speed comparators, these circuits will generate a long additional delay, and the delay time is greatly affected by process, temperature and power supply voltage, and the accuracy of metastability detection is limited

Method used

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  • Metastable state detection circuit suitable for high-speed comparator
  • Metastable state detection circuit suitable for high-speed comparator

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Embodiment Construction

[0015] Describe technical scheme of the present invention in detail below in conjunction with accompanying drawing:

[0016] The metastable state detection circuit of the present invention is used for judging whether the comparator has given an effective logic result after a controllable period of time, and provides a metastable state flag signal. Such as figure 1 As shown, the present invention is mainly composed of three parts: main comparator, adjustable delay circuit and detector.

[0017] The main comparator is the first comparator COMP1.

[0018] The non-inverting input terminal and the inverting input terminal of COMP1 are respectively connected to input signals VIP and VIN. The non-inverting and inverting outputs of COMP1 are labeled nodes VOP and VON. The control clock terminal of COMP1 is connected to the comparator control clock CLK. When CLK is at a high level, COMP1 works as a comparison phase, comparing the magnitudes of VIP and VIN. In the comparison phase,...

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Abstract

The invention belongs to the technical field of analog-digital hybrid integrated circuits, and particularly relates to a metastable state detection circuit suitable for a high-speed comparator. The metastable state detection circuit is used for judging whether a comparator gives an effective logic result or not after a period of controllable time and giving a metastable state marking signal, and mainly comprises three parts, namely a main comparator, an adjustable delay circuit and a detector, wherein the adjustable delay circuit is used for giving detection time of the main comparator and triggering a signal of the detector, and the detector is used for carrying out metastable state detection. The metastable state detection circuit is suitable for the high-speed comparator, the delay time of the detection circuit is very short, the detection precision is high, and the fluctuation of the detection precision along with the process, the temperature and the power supply voltage is small.

Description

technical field [0001] The invention belongs to the technical field of analog-digital hybrid integrated circuits, and in particular relates to a metastable state detection circuit suitable for high-speed comparators. Background technique [0002] A comparator is a very common circuit module in an analog-digital hybrid integrated circuit, which is used to compare the magnitude of two input signals and obtain a logical result. The dynamic comparator is one of the big categories, it has two working phases of comparing and resetting. In the comparison phase, the comparator compares the magnitude of the input signal; in the reset phase, the reset switch restores the voltage of each node inside the circuit to the preset value, so as to ensure the normal operation of the next comparison phase and prevent the next comparison result from being affected by this time. Impact of comparison results. Since the dynamic comparator consumes no quiescent current, it is widely used in low-po...

Claims

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Application Information

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IPC IPC(8): G01R31/28
CPCY02D10/00
Inventor 唐鹤刘汉鹏周绍虎
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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