Comparator with adjustable hysteresis voltage

Abstract

A hysteresis voltage adjustable comparator is characterized in that a hysteresis voltage control pin is added on the basis of five pins of the comparator, a first switch resistor array and a second switch resistor array corresponding to the hysteresis voltage control pin are arranged in a comparator circuit, switches are CMOS (complementary metal oxide semiconductor) logic switches. The resistorsare all internal resistors of the chip, and the hysteresis voltage value can be determined by gating the resistors in the switch resistor array, so that the effective adjustment of the hysteresis voltage of the comparator is realized, and the restriction of the fixed hysteresis voltage design on the application range of the comparator is eliminated.

Description

Technical field [0001] The present invention relates to comparator techniques, in particular a comparator tunable, and increases a hysteresis voltage control pin by adding a hysteresis voltage on the basis of the 5 pins of the comparator, and causes the hysteresis voltage. The first switching resistor array and the second switching resistor array corresponding to the control pins are disposed in the comparator circuit, the switch being a CMOS logic switch, the resistance being an internal resistance of the chip, and can pass the gate switching resistor array. The resistor determines the hysteresis voltage value, thereby achieving effective adjustment of the comparator hysteresis voltage to eliminate the restriction of the application range of the comparator application. Background technique [0002] In the application of the comparator, in order to improve the anti-interference ability of the signal processing, the hysteresis comparator is selected. This comparator is to improve ...

AI Technical Summary

Problems solved by technology

The advantage of the external positive feedback hysteresis comparator is that the user of the comparator can freely choose the resistance value of the feedback resistor and the input resistor to design the size of the hysteresis voltage. The disadvantage is that two peripheral devices are required, that is, two peripheral resistors. This increases the cost in the application

However, the existing internal hysteresis comparator chips generally only have a fixed hysteresis voltage design

When the hysteresis voltage is designed too low, false pulses will appear during the processing of large interference signals; and if the hysteresis voltage is too high, it cannot be used in applications that require sensitive signal processing, making the application of comparators scope is limited

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