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Comparator

A comparator and input tube technology, applied in the field of comparators, can solve the problems of low hysteresis accuracy of comparators, achieve the effect of realizing hysteresis voltage and hysteresis direction, and realizing adjustable and high hysteresis accuracy

Active Publication Date: 2021-06-18
MICROTERA SEMICON (GUANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a

Method used

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  • Comparator
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Embodiment 1

[0047] Such as figure 1 with 2 As shown, this embodiment provides a comparator, the comparator comprising:

[0048] The input pair 101 includes a positive input tube M1 and a negative terminal input tube M2 for inputting the positive terminal signal IN + and the negative signal IN- to be compared.

[0049] The hysteresis control module 102 is connected to the source of the positive input tube M1 and the source of the negative end input tube M2, for inputting tubes to the positive end when the input pair 101 is an NMOS tube. The source of M1 or the source of the negative end input tube M2 injects the setting current IX to control the hysteresis voltage; when the input pair 101 is a PMOS tube, by the source of the positive input tube M1 or The source extraction of the source extraction of the negative terminal input tube M2 is set to control the hysteresis voltage.

[0050] As an example, such as figure 1 with 2 As shown, the comparator further includes a load module 103 and a curre...

Embodiment 2

[0058] Such as image 3 As shown, the present embodiment provides a comparator including: the first comparison unit 200 and the second comparison unit 300, the first comparison unit 200 including: NMOS input pairing tube 201 and the first hysteresis control module 202, the second comparison unit 300 includes: a PMOS input pair 301 and a second hysteresis control module 302, wherein

[0059] The NMOS input pair 201 includes a positive NMOS input tube MN1 and a negative terminal NMOS input tube MN2 for inputting a positive terminal signal IN + and a negative signal IN- to be compared.

[0060] The first hysteresis control module 202 connects the source of the positive NMOS input tube MN1 and the source of the negative terminal NMOS input tube MN2 for the source or place of the positive NMOS input tube MN1. The source of the negative terminal NMOS input tube MN2 is injected into the set current IX to control the hysteresis voltage;

[0061] The PMOS input pair 301 includes a positive ...

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Abstract

The invention provides a comparator, and the comparator comprises an input pair transistor which comprises a positive-end input transistor and a negative-end input transistor and is used for inputting a positive-end signal and a negative-end signal to be compared; a hysteresis control module, which is connected with a source electrode of the positive-end input tube and a source electrode of the negative-end input tube, and is used for controlling hysteresis voltage by injecting set current into the source electrode of the positive-end input tube or the source electrode of the negative-end input tube when the input geminate transistors are NMOS (N-channel metal oxide semiconductor) transistors; and when the input pair transistors are PMOS (P-channel Metal Oxide Semiconductor) transistors, hysteresis voltage is controlled by extracting set current from the source electrode of the positive-end input transistor or the source electrode of the negative-end input transistor. According to the comparator provided by the invention, the problem of low hysteresis precision of the existing comparator is solved.

Description

Technical field [0001] The present invention belongs to the field of integrated circuit design, in particular to a comparator. Background technique [0002] The comparator can be used as a sub-module for most analog-to-digital converters, or it can be used as a functional module in analog control field, so it can be integrated into the MCU as an important functional module. [0003] The comparator hysteresis refers to the difference between the comparator output from high hop to low and from low hop to high, which is one of the most important indicators of the comparator. The routine application can be 0, but generally is more critical. The field of control requires precise control of hysteresis and is not 0. Because of the hysteresis 0, if the input change is slow and the random noise shake will cause the output to turn back in high and low, this situation can cause the control terminal to catch a specific state, which will cause the system to make confusion. It can be seen that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
CPCH03M1/12
Inventor 刘森张均安李建平向可强符韬班桂春
Owner MICROTERA SEMICON (GUANGZHOU) CO LTD
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