A controllable active resistor

A technology of active resistance and resistance, which is applied in the field of instrument calibration, can solve the problems of small resistance range and low resolution of resistors, and achieve the effect of simple circuit, high resolution and easy operation

Inactive Publication Date: 2018-05-25
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a controllable active resistor, which solves the problem of small resistance range and low resolution of resistors in the prior art

Method used

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  • A controllable active resistor
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Embodiment Construction

[0023] Below in conjunction with accompanying drawing, structure and working process of the present invention will be further described.

[0024] A controllable active resistor, comprising first to fourth amplifiers, first to eighth resistors, switch tubes, and a voltage follower, wherein the first to fourth amplifiers and the voltage follower each include a positive input terminal and a negative input terminal, output terminal, the switch tube includes an input terminal, an output terminal, and a control terminal, the positive input terminal of the first amplifier is connected to its output terminal, and the negative input terminal of the first amplifier is respectively connected to the input terminal of the switch tube and the positive input terminal of the voltage follower The end is connected and used as one end of the controllable active resistance, the output end of the first amplifier is connected with one end of the first resistance; the negative input end of the second...

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Abstract

The invention discloses a controllable active resistor. A voltage follower is added in a traditional active resistor. Influence of an access circuit to resistance of the active resistor is eliminated, and higher precision is realized. The invention further provides a controllable active resistor. A manner of serially connecting at least two switch tubes is utilized so that the resistance of an active resistor circuit can be randomly adjusted between zero and a nominal value, thereby improving precision and extending measuring range. The controllable active resistor has advantages of simple circuit, easy and automatic operation, wide measuring range, high resolution, etc.

Description

technical field [0001] The invention belongs to the field of instrument calibration, and in particular relates to a controllable active resistance. Background technique [0002] At present, the verification and calibration of high-precision instruments is one of the research hotspots in the field of scientific research. Among them, the verification and calibration equipment is a key factor, which has higher requirements for each circuit device. Trimmable resistors are widely used in verification and calibration instruments. As an important component of analog circuits, it is widely used in circuits such as adaptive filters, signal generators, and automatic gain control amplifiers to change the characteristics of signal generators. For example, automatic weather stations use variable resistors to calibrate the temperature sensor. The temperature measuring instrument is a kind of temperature measuring instrument, and the temperature calibrator is an instrument for testing t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K15/00
CPCG01K15/005
Inventor 行鸿彦赵晨
Owner NANJING UNIV OF INFORMATION SCI & TECH
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