Filter and amplification circuit for human body electronic scale

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...

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