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Voltage-controlled voltage source type order filtering circuit based on switch modulation and production method

A voltage-controlled voltage and switch modulation technology, applied in the electronic field, can solve problems such as aliasing, and achieve the effect of simple structure and convenient design

Inactive Publication Date: 2016-11-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, if the general low-pass filter method with fixed cut-off frequency is adopted, when the variation range of the rotational speed is large, the following problems will be brought about: at a certain cut-off frequency, at low speed, at E S There may be aliasing around / 2; at high speeds, the signal of interest may be filtered out sufficiently

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  • Voltage-controlled voltage source type order filtering circuit based on switch modulation and production method
  • Voltage-controlled voltage source type order filtering circuit based on switch modulation and production method
  • Voltage-controlled voltage source type order filtering circuit based on switch modulation and production method

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0034] Such as figure 1 As shown, in the present invention, two analog electronic switches S1 and S2 are embedded in the multiple feedback low-pass filter circuit. The switches S1 and S2 can be opened or closed by adding a control signal at the control terminal C. In the present invention, it is assumed that a logic high level is connected to the C terminal, the switch is closed, and a logic low level is connected to the C terminal, the switch is turned off.

[0035] The operating principle of t...

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Abstract

The invention provides a voltage-controlled voltage source type order filtering circuit based on switch modulation and a production method. The circuit comprises a control signal input end, a first resistor switch serial connection module, a second resistor switch serial connection module, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2 and an operational amplifier. The circuit provided by the invention has an order filtering function. The circuit can be designed only through the general operational amplifier, resistors and capacitors. According to the circuit, the input signal range is only determined by the working voltage of the operational amplifier. If the working voltage of the operational amplifier is + / - 15V, the input signal range approximates to + / - 15V. The circuit is simple in structure and convenient in design.

Description

technical field [0001] The invention relates to electronic technology, in particular to a voltage-controlled voltage source type order filter circuit based on switch modulation and a manufacturing method. Background technique [0002] In the test of the vibration and noise signals of the rotary machinery, for the case of uniform rotation, sampling at equal time intervals is generally adopted and conventional spectrum analysis is performed. However, in the process of speed change, sampling at equal time intervals will make the frequency components on the spectrogram blurred. To this end, the signal must be analyzed using a sampling sequence of equal rotation angles, the so-called order analysis. [0003] Assuming that the number of samples per revolution of the rotary machine is E S , according to the order sampling theorem, in order to avoid aliasing, E must be filtered out of the signal before order sampling S / 2 or higher order components. Obviously, if the general low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/12
CPCH03H11/1291
Inventor 田社平朱珏颖
Owner SHANGHAI JIAO TONG UNIV