Filter and amplification circuit for human body electronic scale

A filter amplifier circuit and electronic scale technology, which is applied in the direction of improving the amplifier to reduce noise influence, weighing, special scales, etc., can solve the problems that the amplifier circuit cannot achieve a stable magnification, low noise and low drift, and the amplifier is susceptible to interference. To achieve the effect of stable magnification

Inactive Publication Date: 2015-04-29
CHENGDU RUITENG SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional amplifiers used in human body electronic scales are susceptible to interference, and the amplifier circuit cannot meet the requirements of stable magnification, low noise and low drift

Method used

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  • Filter and amplification circuit for human body electronic scale

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with accompanying drawing:

[0010] Such as figure 1 As shown, the present invention is a filter amplifier circuit for human body electronic scales, including the first resistor R1 to the eleventh resistor R11, the first capacitor C1 to the third capacitor C3 and the first integrated operational amplifier IC1 to the third integrated operational amplifier Amplifier IC3, the positive voltage input terminal of the power supply is respectively connected with the positive power supply terminal of the second integrated operational amplifier IC2, the positive power supply terminal of the first integrated operational amplifier IC1 and the positive power supply terminal of the third integrator IC3, and the negative voltage input terminal of the power supply Connect with the negative power supply terminal of the first integrated operational amplifier IC1, the negative pole power supply terminal of the second int...

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Abstract

The invention discloses a filter and amplification circuit for a human body electronic scale. The filter and amplification circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first capacitor, a second capacitor, a third capacitor, a first integrated operational amplifier, a second integrated operational amplifier and a third integrated operational amplifier, wherein the anode voltage input end of a power supply is connected with the anode power end of the second integrated operational amplifier, the anode power end of the first integrated operational amplifier and the anode power end of the third integrated operational amplifier respectively; the cathode voltage input end of the power supply is connected with the cathode power end of the first integrated operational amplifier, the cathode power end of the second integrated operational amplifier and the cathode power end of the third integrated operational amplifier respectively. The filter and amplification circuit for the human body electronic scale has the advantages that the circuit uses a low-pass filter to filter signals and is interference resistance; in addition, the three integrated operational amplifiers are used, so that the circuit can achieve the requirements of stabilized amplification factor, low noise and low drift; the filter and amplification circuit is worthy of popularization and application.

Description

technical field [0001] The invention relates to a filter amplifier circuit, in particular to a filter amplifier circuit used for human body electronic scales. Background technique [0002] When the human body electronic scale weighs, the gravity is converted into an analog signal of voltage or current through the weight sensor installed on the mechanism. After amplification and filtering, it is converted into a digital signal by the A / D processor, and the digital signal is sent by the central processing unit. Computing and processing, and the functions required by the peripherals and various interface circuits are also connected to the CPU for application, and finally displayed digitally by the display screen. Human body electronic scales are equipped with amplification circuits for amplifying the weak signals output by the weight sensor to meet subsequent conversion requirements. Traditional amplifiers used in human electronic scales are susceptible to interference, and th...

Claims

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Application Information

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IPC IPC(8): H03F1/26G01G19/44
Inventor 胡光远
Owner CHENGDU RUITENG SCI & TECH
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