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Programmable variable resistor

A resistor and variable technology, applied in the field of circuits, can solve the problems of the resistance value change of pull-up or pull-down resistor and the inability to achieve high precision, and achieve the effect of high precision

Active Publication Date: 2019-05-03
小华半导体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the equivalent resistance value of the MOS tube will change drastically with changes in voltage or temperature, this will cause a large change in the resistance value of the pull-up or pull-down resistor, so the current MOS tube equivalent resistance scheme is basically impossible to achieve High-precision pull-up or pull-down resistors

Method used

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  • Programmable variable resistor
  • Programmable variable resistor
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Examples

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Embodiment Construction

[0022] It should be noted that components in the various figures may be shown exaggerated for the purpose of illustration and are not necessarily true to scale. In the various figures, identical or functionally identical components are assigned the same reference symbols.

[0023] In the present invention, unless otherwise specified, "arranged on", "arranged on" and "arranged on" do not exclude the presence of intermediates between the two.

[0024] In the present invention, each embodiment is only intended to illustrate the solutions of the present invention, and should not be construed as limiting.

[0025] It should also be pointed out here that in the embodiments of the present invention, for the sake of clarity and simplicity, only a part of parts or components may be shown, but those skilled in the art can understand that under the teaching of the present invention, specific The scene needs to add the required parts or components.

[0026] It should also be pointed out...

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Abstract

The invention relates to a programmable variable resistor. The resistor comprises a plurality of resistor units which are connected in series. Each resistor unit comprises a MOSFET and a resistor, wherein the grid electrode of the MOSFET is connected to a switch control signal, a source electrode and a drain electrode are connected to the drain electrode or the source electrode of the MOSFET of the other resistor unit; and the resistor is connected in parallel with the MOSFET. Through the variable resistor, the influences of a temperature and a voltage on a resistance value can be reduced, theresistance value can be accurately adjusted conveniently, and the variable resistor can represent the above characteristic when being taken as a pull-up resistor or a pull-down resistor.

Description

technical field [0001] The present invention generally relates to the field of circuits, in particular to a programmable variable resistor. Background technique [0002] Almost all mainstream MCUs have pull-up and / or pull-down resistors on their I / Os. For schematic diagrams of pull-up and pull-down resistors, see figure 1 , wherein the pull-up resistor is a resistor that pulls up the voltage of the output terminal (for example, pulls it toward the power supply voltage Vdd direction), and the pull-down resistor is a resistor that pulls the voltage of the output terminal down (for example, pulls it toward the ground GND direction). [0003] At present, these pull-up and pull-down resistors are mostly realized by the equivalent resistance of n-type or p-type MOSFET (Metal Oxide Semiconductor Field Effect Transistor, Metal Oxide Semiconductor Field Effect Transistor MOSFET). However, since the equivalent resistance value of the MOS tube will change drastically with changes in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/042
Inventor 刘慧谢文录
Owner 小华半导体有限公司