Filtering device of mobile data acquisition device

Abstract

The invention discloses a filtering device of a mobile data acquisition device. The filtering device comprises a first filtering circuit, wherein the first filtering circuit comprises a first operational amplifier, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2 and a fourth capacitor C4; the first resistor R1 is serially connected with the second resistor R2, the other end of the end of the first resistor R1 that is connected with the second resistor R2 is a signal input end, and the other end of the end of the second resistor R2 that is connected with the first resistor R1 is connected with the inverting input end of the first operational amplifier; one end of the second capacitor C2 is connected to a circuit on which the first resistor R1 is connected with the second resistor R2, and the other end of the second capacitor C2 is connected with the output end of the first operational amplifier. According to the filtering device disclosed by the invention, the capacitors are connected to the connection line between a power supply and the first operational amplifier so as to ensure that a filter has no overshoot, is short in reducing time, and is reasonable in each frequency attenuation that is higher than the data rate; and the magnitude-frequency characteristics in transmission bands are stable, transition bands with suitable length can also be provided, and distortion cannot be easily caused.

Description

technical field [0001] The invention relates to a filter of a collection device, in particular to a filter device of a mobile data collection device. Background technique [0002] Filters, as the name suggests, are devices that filter waves. "Wave" is a very broad physical concept. In the field of electronic technology, "wave" is narrowly limited to the process of describing the fluctuation of the value of various physical quantities with time. Through the action of various sensors, it is converted into a time function of voltage or current, which is called the time waveform of various physical quantities, or called a signal. The signal of the mobile terminal data acquisition device may be distorted due to the existence of the environment and interference in every link of its generation, conversion and transmission, and even in quite a few cases, the distortion is so serious that the signal and The information it carries is jammed. Existing filters have stable amplitude-f...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is the deficiency of the existing filter, and the purpose is to provide a filter device for a mobile data acquisition device and solve the problem of unreasonable attenuation of each frequency

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