Active filtering device adjustable to fit various specifications

A filter device, specification technology, applied to the network using active components, impedance network, electrical components, etc.

Inactive Publication Date: 2012-12-05
SUNPLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coefficients of the aforementioned SC capacitor filter can be accurate to 0.1%, but

Method used

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  • Active filtering device adjustable to fit various specifications
  • Active filtering device adjustable to fit various specifications
  • Active filtering device adjustable to fit various specifications

Examples

Experimental program
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Embodiment Construction

[0037] The present invention relates to an active filtering device which can be adjusted to suit various specifications, and it is applied in a receiver or an analog-to-digital converter. Figure 5 It is a schematic diagram of a filter device 500 that is active and adjustable to various specifications according to a preferred embodiment of the present invention. It is formed by connecting an odd number of filters 510 in series, for example, 3, 5, or 7 filters 510 are connected in series. For the convenience of description, this embodiment is only illustrated by connecting three filters 510 in series, and those skilled in the art should be able to easily extend the technology of the present invention to the case where an odd number of filters 510 are connected in series.

[0038] The filter device 500 that is active and adjustable to various specifications includes a first filter 1 , a second filter 2 , and a third filter 3 .

[0039] The first filter 1 has a relatively low fi...

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PUM

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Abstract

The invention provides an active filtering device adjustable to fit various specifications. A first filter has a first quality factor to define the frequency width and the center frequency of the filtering device; a second filter is connected to the first filter and has a second quality factor, and the frequency spectrums of the first filter and the second filter are used for defining the frequency of the filter at low frequency in frequency width and the sharpness of the frequency width at low frequency in the frequency width; a third filter is connected to the second filter and has a third quality factor, and the frequency spectrums of the first filter and the third filter are used for defining the frequency of the filter at high frequency in the frequency width and the sharpness of the frequency width at high frequency in the frequency width; the value of the first quality factor is adjustable, and the adjustment range is between 5 and 15; and the value of the second quality factor and the third quality factor is adjustable, and the adjustment range is above 15.

Description

technical field [0001] The invention relates to a filter device, especially an active filter device that can be adjusted to suit various specifications. Background technique [0002] The structure of a general receiver can be divided into single conversion IF output (Single Conversion with IF), single conversion low IF output (Single Conversion with Low IF), single conversion zero IF output (Single Conversion with Zero IF), double conversion IF output (Dual Conversion with IF), double conversion low IF output (Dual Conversion with Low IF), and double conversion zero IF output (Dual Conversion with Zero IF). Wherein, in the structures of single-conversion IF output, double-conversion IF output and double-conversion low-IF output, the IF filter performs the functions of frequency selection and filtering. Because the surface acoustic wave filter (SAW Filter) has the advantages of high quality factor (quality factor, Q), low frequency drift and no power consumption, and the sur...

Claims

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Application Information

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IPC IPC(8): H03H11/36
Inventor 陈俊亮徐慧君
Owner SUNPLUS TECH CO LTD
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