Voltage comparator

A voltage comparator and voltage technology, applied in the field of analog circuits, can solve problems such as inaccurate output results of voltage comparators, and achieve the effect of accurate comparison results and small power supply operating voltage

Active Publication Date: 2020-04-24
NANJING ZGMICRO CO LTD
View PDF10 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the deviation of the generated reference voltage, the output result of the voltage comparator using such a reference circuit is also inaccurate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Voltage comparator
  • Voltage comparator
  • Voltage comparator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0020] figure 1 A structure diagram of a reference circuit under a low power supply voltage provided for an embodiment of the present invention, as shown in the figure, includes a voltage generation unit and a current source unit with an approximate zero temperature coefficient.

[0021] a voltage generating unit, coupled between the voltage input terminal and the voltage output terminal of the reference circuit, and generates an output volta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The embodiment of the invention provides a voltage comparator. The voltage comparator includes a reference circuit providing a reference output voltage; and a comparison unit, wherein the first inputend of the comparison unit receives the reference output voltage, the second input end of the comparison unit is connected with target voltage, and the output end of the comparison unit outputs a comparison result. The reference circuit comprises a voltage generation unit, an approximate zero temperature coefficient current source unit and a level shifting unit. The approximate zero temperature coefficient current source unit comprises a negative feedback voltage regulation unit, an average current unit, a first positive temperature coefficient current unit, a first negative temperature coefficient voltage unit, a first negative temperature coefficient current unit, a second negative temperature coefficient voltage unit and a second negative temperature coefficient current unit. Zero temperature coefficient can be realized by designing the resistance ratio of the first negative temperature coefficient current unit to the second negative temperature coefficient current unit; by designing the voltage on the current sharing unit, a smaller power supply working voltage can be realized.

Description

technical field [0001] The present invention relates to the field of analog circuits, and more specifically, to a voltage comparator. Background technique [0002] The reference circuit (reference voltage circuit), also known as the reference voltage source, is a circuit that can provide a stable output voltage when the process, power supply voltage, and temperature change. Voltage references are widely used in circuits such as data converters, smart sensors, and power converters. [0003] Conventional reference circuits generally adopt a bandgap circuit design. Since the bandgap voltage is generally about 1.21-1.22V, the output voltage is 1.21-1.22V, which requires the lowest power supply voltage to be greater than this voltage plus at least one Vds voltage to work. Generally, Vds needs at least 0.1V. Therefore, generally this kind of circuit requires a power supply voltage greater than 1.31V. In some applications, it is required to operate at a lower supply voltage, so ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/24
CPCH03K5/24
Inventor 王钊
Owner NANJING ZGMICRO CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap