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Self-test circuit and self-test method applied to comparator

A technology for testing circuits and testing methods, which is applied in the field of comparators and can solve problems such as errors in subsequent circuits

Active Publication Date: 2021-05-25
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the beginning of the comparison phase to the end of the comparison phase, the change of the logic value of signal Q and signal #Q is: (1,1)→(0,0)→(1,0)→(1,1); among them, the transient The logical value of (0,0) may cause errors in the subsequent circuit (the circuit that uses signal Q and signal #Q as input signals)

Method used

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  • Self-test circuit and self-test method applied to comparator
  • Self-test circuit and self-test method applied to comparator
  • Self-test circuit and self-test method applied to comparator

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Embodiment Construction

[0042] The technical terms in the following explanations refer to the customary terms in this technical field. If some terms are explained or defined in this manual, the explanations or definitions of this part of the terms shall prevail.

[0043]The disclosure of this case includes the self-test circuit and self-test method of the comparator. Since some components included in the self-test circuit of the comparator in this case may be known components individually, on the premise of not affecting the full disclosure and practicability of the device embodiment, the details of the known components will be described below will be omitted. In addition, part or all of the flow of the comparator self-test method of the present application may be in the form of software and / or firmware, and may be executed by the self-test circuit of the present application or its equivalent device.

[0044] Figure 4 It is a circuit diagram of a self-test circuit of an embodiment of the present c...

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Abstract

This case discloses a self-test circuit and a self-test method applied to a comparator. The first output terminal of the comparator is coupled to the input terminal of the first inverter, and the second output terminal of the comparator is coupled to the input terminal of the second inverter. The comparator operates in a reset phase or a compare phase according to a clock. The self-test method includes: coupling the first output terminal and the second output terminal, making the comparator enter the test mode; and making the comparator operate in the reset phase or the comparison phase according to the clock in the test mode. In the test mode, the first output terminal and the second output terminal have substantially the same voltage. The self-test circuit and self-test method applied to the comparator in this case can know whether the comparator has an error, and can selectively adjust the comparator when an error is found to reduce the probability of circuit error.

Description

technical field [0001] This case involves comparators, especially self-test circuits and self-test methods applied to comparators. Background technique [0002] figure 1 The circuit diagram for the existing comparator. The comparator 100 is a two-stage comparator. The first stage includes five transistors in the preamplifier 110 , and the second stage includes transistors other than the aforementioned transistors. The second stage of the comparator 100 includes two positive-feedback connected inverters; one of the two inverters is composed of a transistor 121a and a transistor 121b, and the other is composed of a transistor 122a and a transistor 122b. The comparator 100 receives signals VIP and VIN from the first stage, and outputs signals VOP and VON from the second stage. The comparator 100 operates in a reset phase or a comparison phase according to the clock CLK and its inverted signal #CLK. When the comparator 100 is applied to a certain system (such as an analog-to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/317
CPCG01R31/31703
Inventor 雷良焕黄诗雄陈志龙
Owner REALTEK SEMICON CORP