Improved Voltage Comparator

A technology of voltage comparator and sampling voltage, applied in electrical components, multiple input and output pulse circuits, pulse technology, etc., can solve problems such as current mirror mismatch and process deviation, reduce mismatch, improve precision, The effect of improving the copying accuracy

Active Publication Date: 2019-07-19
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the process deviation, the output current will not be equal to the input current, that is, the mismatch of the current mirror

Method used

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  • Improved Voltage Comparator
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Embodiment Construction

[0028] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly.

[0030] Please refer to figure 2 As shown, it is a schematic circuit diagram of an improved current mirror circuit in an embodiment of the present invention. figure 2 Th...

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Abstract

The invention provides a voltage comparator. The voltage comparator comprises a current mirror circuit, a third resistor, a fourth resistor, a first bipolar transistor, a second bipolar transistor, asecond current source and a third MOS (Metal Oxide Semiconductor) transistor. The current mirror circuit has very small current mirror current duplication mismatch, and very high current duplication precision, so that the precision of an internal reference voltage threshold of the voltage comparator can be increased.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of electronic circuits, in particular to an improved voltage comparator. [0003] 【Background technique】 [0004] Current mirrors are widely used in various analog circuits, for example, to generate current bias or as a load for operational amplifiers. However, due to process deviations, the output current is not equal to the input current, which is manifested as a mismatch of the current mirror. [0005] Please refer to figure 1 As shown, it is a schematic circuit diagram of a current mirror in the prior art, which includes PMOS (positive channel Metal Oxide Semiconductor) transistors MP1 and MP2, and the input current source I1 can generate an output current Io through the current mirror. Due to process deviation, there is a mismatch between PMOS transistors MP1 and MP2 during mass production, so that the current value of the output current Io of some chips is greater than the current value of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/24
CPCH03K5/2481
Inventor 王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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