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Hysteresis comparator with a programmable threshold value

A hysteresis comparator and dynamic comparator technology, applied in the field of hysteresis comparators, can solve the problems of time and money waste, and achieve the effects of strong anti-interference, large application range, and programmable threshold voltage

Pending Publication Date: 2019-09-27
CHANGSHA JEMO IC DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For integrated circuit design, this means re-spinning, resulting in a waste of time and money

Method used

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  • Hysteresis comparator with a programmable threshold value
  • Hysteresis comparator with a programmable threshold value
  • Hysteresis comparator with a programmable threshold value

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific implementation.

[0013] figure 2 It is a schematic diagram of a preferred embodiment of a threshold-programmable hysteresis comparator in the present invention, which mainly includes a hysteresis threshold selection logic module 11 , a dynamic comparator module 12 , a latch module 13 , and a hysteresis generating circuit module 10 . The specific implementation plan is as follows:

[0014] The resistor divider circuit 1 in the hysteresis threshold selection logic module 11 divides the power supply voltage into 8 levels of reference voltages, including 4 levels of high threshold reference voltages and 4 levels of low threshold reference voltages. Threshold value selection logic circuit 2 selects 1 high threshold reference voltage VIH among 4 high threshold reference voltages and outputs it to the input terminal of N input dynamic comparator 4, and ...

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Abstract

The invention discloses a hysteresis comparator with a programmable threshold value. Corresponding high threshold voltage and low threshold voltage are selected as reference voltage of the hysteresis comparator through resistance voltage division; external input voltage is compared with two reference voltages through the hysteresis comparator and then a comparison result is output, so that the hysteresis comparator with a programmable threshold value has the characteristics of high and low threshold voltage programmability, high interference resistance and the like, and has a great application range in the field of integrated circuit design.

Description

technical field [0001] The invention relates to an analog hysteresis comparator, in particular to a hysteresis comparator with programmable threshold. Background technique [0002] Hysteresis comparators are widely used in the field of digital-analog hybrid circuit design. Based on the hysteresis characteristic, noise interference can be removed, and a correct comparison of input signals with noise can be realized. In addition, hysteretic comparators can also be used with resistors and capacitors to implement relaxation oscillators and timing circuits. [0003] Common CMOS hysteresis comparators are Schmitt triggers, such as figure 1 As shown, the circuit structure is simple, and the hysteresis width is determined by the size of the internal MOS tube, the threshold voltage of the MOS tube, and the power supply voltage. Therefore, once the circuit design is completed, the threshold voltage is fixed and cannot be adjusted. If the hysteresis width needs to be adjusted, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/24
CPCH03K5/2481
Inventor 彭伟娣
Owner CHANGSHA JEMO IC DESIGN CO LTD
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