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Polar zero tracking second-order adjustable LC notch filter

A notch filter, filter technology, applied in the direction of frequency selection two-terminal pair network, network using active components, impedance network, etc., to achieve the effect of suppression

Pending Publication Date: 2022-03-01
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main challenge currently faced in notch filter design is how to effectively suppress image frequency signals in the wideband feedback range

Method used

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  • Polar zero tracking second-order adjustable LC notch filter
  • Polar zero tracking second-order adjustable LC notch filter
  • Polar zero tracking second-order adjustable LC notch filter

Examples

Experimental program
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Embodiment Construction

[0017] The present invention will be further explained below in conjunction with the accompanying drawings.

[0018] like figure 1 As shown, a pole-zero tracking second-order adjustable LC notch filter of the present invention includes: input terminal Input, filter first series inductance L1, filter second series inductance L2, filter third parallel inductance L3 , parallel switched capacitor C1, output terminal Output and node A; wherein, the input terminal Input, the first series inductor L1 of the filter, the second series inductor L2 of the filter, and the output terminal Output are sequentially connected in series, and the two ends of the parallel switched capacitor C1 are respectively Connect the input terminal Input and the output terminal Output; the connection point of the first series inductor L1 of the filter and the second series inductor L2 of the filter is node A, one end of the third parallel inductor L3 of the filter is connected to the node A, and the other en...

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Abstract

The invention discloses a polar zero point tracking second-order adjustable LC notch filter, which is characterized in that an input end (Input), a filter first series inductor (L1), a filter second series inductor (L2) and an output end (Output) are sequentially connected in series, and two ends of a parallel switch capacitor (C1) are respectively connected with the input end (Input) and the output end (Output); the connection point of the filter first series inductor (L1) and the filter second series inductor (L2) is a node (A), one end of the filter third parallel inductor (L3) is connected with the node (A), and the other end of the filter third parallel inductor (L3) is grounded. Based on the second-order LC filter network, polar zero point tracking is realized by using the parallel switched capacitors, tracking suppression of the mirror image signal of the broadband transceiver is realized, and the suppression ratio of the mirror image signal is effectively improved in a broadband range.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a pole-zero tracking second-order LC notch filter circuit, which belongs to the technical field of notch filter design. Background technique [0002] In the transceiver system, image interference refers to the interference signal generated during the up-mixing and down-mixing process of the signal. The generation of the image signal not only has a great impact on its own transceiver system, but also affects other useful channels through the transmitter into the space. Due to the harm of the image signal, the image rejection ratio is an indispensable index in the transceiver system. There are two commonly used methods to realize image suppression: the first transceiver system adopts I / Q circuit structure; the second is to add a notch filter. The method of adopting the I / Q road structure requires the I road and the Q road, which greatly increases the area and power co...

Claims

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Application Information

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IPC IPC(8): H03H11/04
CPCH03H11/04H03H2011/0488
Inventor 李连鸣汪弋阳段海鹏吴旭王东明
Owner SOUTHEAST UNIV