A method for estimating analog filter parameters
An analog filter and parameter technology, applied in the direction of digital technology network, impedance network, electrical components, etc., can solve problems such as parameter uncertainty and complex design
Inactive Publication Date: 2018-05-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0003] In general, the higher the order or quality factor of an analog filter, the more complex its design
However, the components of analog filters, such as resistors, capacitors, inductors, or integrated op amps, are extremely susceptible to the influence of the environment, manufacturing process, and time aging, resulting in uncertainty in their parameters.
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[0036] figure 1 It is a method principle block diagram of a method for estimating analog filter parameters in the present invention.
[0037] In this example, if figure 1 Shown, the present invention a kind of method for estimating analog filter parameter, comprises the following steps:
[0038] S1. Let the frequency response of the analog filter be H(s), and
[0039]
[0040] Among them, N
[0041] It can be seen from the above formula that the denominator and numerator of H(s) are M-order and N-order polynomials respectively, and the M+N coefficients jointly determine the frequency response of the analog filter H(s).
[0042] However, in practical applications, due to the fact that the analog components in the analog filter are easily affected by factors such as the external environment and self-aging, the polynomial coefficients of the denominator and numerator of ...
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The invention discloses a method for estimating the parameters of an analog filter, which uses the amplification or attenuation characteristics of the amplitude of specific frequency components in the signal by the analog filter to establish a multivariate equation group and solves the method to estimate the parameters of the analog filter. Firstly, the analog filter to be estimated is modeled, and the frequency response expression of the analog filter in the form of Laplace transform is obtained, and then a signal containing multiple frequency components is input to the filter (the amplitude of each frequency component signal is the same), for The output of the filter is sampled to obtain a digital signal, and the FFT spectrum analysis of the digital signal is realized by FPGA, and the amplitude of each frequency component in the output signal of the filter is obtained, and the equations shown above are established and solved. The method for estimating parameters of an analog filter proposed by the invention has a simple principle, and the solving process of its equation system can be realized by MATLAB software.
Description
technical field [0001] The invention belongs to the technical field of analog filters, and more specifically relates to a method for estimating parameters of an analog filter. Background technique [0002] Analog filters can be divided into passive and active filters. Passive filters are mainly composed of passive components resistors, inductors and capacitors. Active filters are mainly composed of integrated operational amplifiers, resistors, and capacitors, and have the advantages of no inductor, small size, and light weight. [0003] Generally speaking, the higher the order or quality factor of an analog filter, the more complex its design. However, the components of the analog filter, such as resistors, capacitors, inductors, or integrated operational amplifiers, are extremely susceptible to the influence of the environment, manufacturing process, and time aging, resulting in uncertainty in its parameters. Therefore, it is necessary to accurately realize the estimatio...
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IPC IPC(8): H03H17/02
CPCH03H17/0211
Inventor 郭连平蒋俊赵勇谭峰邱渡裕张沁川潘卉青
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA