Hysteresis voltage comparator

A voltage comparator and hysteresis technology, which is applied in the field of new voltage comparator circuits, can solve problems such as limited application range and large power consumption, and achieve the effect of large use flexibility and adjustable hysteresis width

Inactive Publication Date: 2012-10-31
SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the input signal frequency is high, a large tail current I20 is required to achieve a fast flip rate, so the circuit requires a large power consumption to maintain a high transition rate, and if you want to adjust the hysteresis width, you need to change the MOS Tube width-to-length ratio, thus limiting its range of applications

Method used

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, preferred specific embodiment of the present invention is described:

[0026] Such as image 3 The hysteresis voltage comparator shown is composed of an open-loop comparison circuit and a threshold generation circuit connected in feedback with the open-loop comparison circuit. An input NMOS transistor M1, a second input NMOS transistor M2 whose gate is electrically connected to the voltage negative input terminal V1-, and a circuit composed of two mirror image PMOS transistors M6 and M7 that are electrically connected to the drain of the first input NMOS transistor M1 The first load MOS transistor, the second load MOS transistor electrically connected to the drain of the second input NMOS transistor M2, which is also composed of two mirrored PMOS transistors M8 and M9, is connected to the first load MOS transistor and the second load MOS transistor respectively. The third load MOS transistor M10 and the fourth load MOS tr...

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Abstract

The invention relates to a hysteresis voltage comparator, comprising an open loop comparator circuit and a threshold value generating circuit which is connected with the open loop comparator circuit in a feedback way to generate hysteresis; the threshold value generating circuit comprises an MOS (metal oxide semiconductor) switching tube and a current source which are added in the open loop comparator circuit, and the turn-on and turn-off of the switching tube are controlled by an output level, thereby forming an inner positive feedback path and further forming a comparator with a certain adjustable hysteresis width. The current of the current source can be adjusted, therefore, the hysteresis width can be adjusted, and the circuit has great using flexibility.

Description

technical field [0001] The invention relates to the technical field of semiconductor integrated circuits, and relates to a novel voltage comparator circuit realizing hysteresis function. Background technique [0002] In actual use, the output of the voltage comparator is often wrong due to the change of the power supply voltage, the deviation of the resistance value, and the temperature drift of the operational amplifier. The potentiometer must be readjusted to change the threshold voltage, so that the comparator can work normally again and output a control signal that meets the requirements. Hysteresis is a property of a comparator whose input threshold is a function of the input (output) level. When the input crosses the threshold, the output changes and the input threshold is lowered, so the input must return to the previous threshold before the output of the comparator changes state again. [0003] The more popular hysteresis comparators are as follows: [0004] ① Com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/24G05F1/56
Inventor 唐兴刚龙善丽白涛武凤芹王丽陈超
Owner SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
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