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Signal filtering method

A signal and signal output technology, applied in impedance networks, electrical components, multi-terminal-pair networks, etc., can solve problems such as non-standard component values, difficulty in obtaining transition band characteristics for RC filters, and increased manufacturing costs.

Inactive Publication Date: 2003-04-16
重庆光通奥普泰通信技术有限公司
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Problems solved by technology

Generally, it is difficult for ordinary RC filters to obtain ideal transition band characteristics.
If other forms of filters are used, such as high-order filters with LC reactive components, although the transition band can be made steep, but because of the large number and types of components and the generally non-standard component values, it will not only increase the manufacturing cost, but also Difficult to integrate; if active filters or amplifiers are used to compensate for the attenuation of useful signals, while the number of components is large, the influence of DC drift caused by active devices must also be considered

Method used

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Embodiment Construction

[0015] Fig. 1 is the circuit diagram of the embodiment. In the dotted box is the simplest set of filter form circuits.

[0016] As shown in Figure 1, this is the simplest form of a set of filtering with only two delayer outputs. Among them, the A output is equivalent to a "0" delay, and has the first delay relationship with the B output. It has a good filtering effect on the fundamental wave and odd harmonics of the width modulation signal. Followed by a π-type RC low-pass filter to filter out other high-order harmonic components.

[0017] Still taking the aforementioned demodulation of a pulse width modulation signal with a frequency of 600 Hz as an example, the structure and filtering effect of the invention will be described.

[0018] A is the usual pulse width modulation signal output, the frequency is 600Hz, and the period is 1639.3uS. The output of B is the pulse width modulation signal of A delayed by half cycle 819.65uS through the delayer. The delay here is easie...

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Abstract

An new signal filter method is characterized by the filter circuit contains delay parts forming many internal delay output signals with two in each group having special delay relations in between. The output signals are output via their respective serial resistor to get filter output. An extraordinary filter property is got by applying this structure which has top attenuation to signal of certainfrequency and its harmonic wave and low pass filer of very steep transition property can be got with only a few RC elements, top attenuation reaches to above 70dB top frequency is serveral times lower than that of ordinary (3dB).

Description

technical field [0001] The present invention relates to signal filtering technology. In particular, it involves filtering technology for certain frequency signals and their harmonic components. Background technique [0002] When it is necessary to filter the sine wave signal of a certain frequency and its harmonic components in the signal, the known technology is to use a conventional active or passive low-pass filter. For example, the demodulation of the pulse width modulation signal, the method is to pass the pulse width modulation signal through a low-pass filter, filter out the high-frequency wide-modulation carrier frequency signal with a certain frequency, and take out the low-frequency modulation signal to realize demodulation. Here, no matter from the perspective of application or ideal filter, it is hoped that the frequency of the modulated signal should be as close as possible to the pulse width under the premise of ensuring that the output of the modulated signal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H1/02H03H7/30
Inventor 赵温阳
Owner 重庆光通奥普泰通信技术有限公司
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