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A real-time filter for high precision signal

A filter, high-precision technology, applied in the direction of impedance network, digital technology network, electrical components, etc., can solve the problems of complex filter circuit structure, complex function, low precision, etc., to reduce the mode conversion process, high filtering precision, and guarantee undistorted effect

Active Publication Date: 2017-12-15
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the existing filter circuits are complex in structure, complex in function, low in precision, and do not have the function of real-time signal processing. However, in the application of on-site acquisition and processing of rotating equipment, the filter is required to have high precision, no attenuation in the passband, and no attenuation in the transition band. As steep as possible, large stopband attenuation, and at the same time have real-time functions

Method used

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  • A real-time filter for high precision signal
  • A real-time filter for high precision signal
  • A real-time filter for high precision signal

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Embodiment Construction

[0032] Such as figure 1 As shown, it is the analog filtering part in the present invention, including a low-noise high-precision operational amplifier OP177, and the signal input terminal Vin is connected to the precision operational amplifier through the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4. The inverting input terminal of the precision operational amplifier is connected to the fifth resistor R5 between the non-inverting input terminal of the precision operational amplifier and the ground, and the sixth resistor R6 is connected between the non-inverting input terminal of the precision operational amplifier and the output terminal of the operational amplifier. The connection between the resistor R1 and the second resistor R2 is grounded through the first capacitor C1, the connection between the second resistor R2 and the third resistor R3 and the output terminal of the operational amplifier is connected to the second capac...

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Abstract

The invention discloses a high-precision signal real-time filter, which sequentially connects an analog filter circuit, an analog-to-digital conversion circuit and a digital filter circuit in series between the signal input and the signal output; the analog filter circuit outputs a signal with a frequency below 800HZ; The above-mentioned digital circuit outputs a signal with a frequency below 100HZ. The present invention can adjust the filtering parameters in real time and control the filtering of the whole circuit through FPGA chip design and receiving external signal instructions. Compared with traditional filters that only have a single frequency band, the present invention is more practical; and because it adopts Software control, the compensation function of the chip design circuit can make the filtering accuracy higher and more reliable, and the output signal is more stable; and the filter of the present invention directly inputs the analog signal and then filters the output digital signal, and the output signal can be used directly and Transmission reduces a large number of mode conversion processes and ensures that the signal is not distorted.

Description

technical field [0001] The invention relates to the field of data acquisition and processing, in particular to a high-precision signal real-time filter. Background technique [0002] The tiny signal acquisition of rotating equipment in a complex environment has strong electromagnetic interference and mechanical vibration electrical signal interference. The filter circuit is used to improve the accuracy of the signal. It is used to allow the signal components in a certain frequency range to pass, while suppressing the application of other frequency components. Most of the existing filter circuits are complex in structure, complex in function, low in precision, and do not have the function of real-time signal processing. However, in the application of on-site acquisition and processing of rotating equipment, the filter is required to have high precision, no attenuation in the passband, and no attenuation in the transition band. As steep as possible, the stopband attenuation i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
Inventor 彭先敏章贵川吴志刚许冰刘忠华陈祖荣
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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