Filter circuit for generating additional transmission zero point and filter

A technology of transmission zero point and filter circuit, applied in the field of filters, can solve the problems of high filter cost and large occupied space.

Pending Publication Date: 2020-06-30
ANHUI ANUKI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In general, a resonant unit is composed of a capacitor and an inductance. To increase the transmission zero point of the filter, it is necessary to increase the number of components to form a resonant unit. Increasing the number of components leads to higher cost of the filter and larger space occupation.

Method used

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  • Filter circuit for generating additional transmission zero point and filter
  • Filter circuit for generating additional transmission zero point and filter
  • Filter circuit for generating additional transmission zero point and filter

Examples

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Comparison scheme
Effect test

Embodiment 1

[0037] figure 1 It is a schematic structural diagram of a filter circuit that generates additional transmission zeros provided by Embodiment 1 of the present invention, refer to figure 1 , the filter circuit includes:

[0038] a parallel resonance generating unit, the parallel resonance generating unit is used to generate resonance;

[0039] The parallel resonant unit includes a first branch 10 connected between the input port A and the output port B, the parallel resonant unit also includes a second branch 20 and a third branch 30, the first end of the second branch 20 is connected to the first branch The first end of a branch 10, the first end of the third branch 30 is connected to the second end of the first branch 10, the second end of the second branch 20 is connected to the second end of the third branch 30 and grounded GND;

[0040] Wherein, both the second branch 20 and the third branch 30 have inductors connected in series, or both the second branch 20 and the thir...

Embodiment 2

[0048] On the basis of the above-mentioned embodiments, Embodiment 2 of the present invention provides a filter circuit for generating additional transmission zeros, wherein the parallel resonance generating unit further includes a first capacitor, and the first capacitor is connected in series on the first branch; the parasitic element is connected to Between the common connection point of the second end of the second branch and the second end of the third branch and the ground; the filter circuit for generating extra transmission zero is suitable for high-pass filter.

[0049] Image 6 It is a circuit diagram of a filter circuit that generates additional transmission zeros provided by Embodiment 1 of the present invention, refer to Image 6 , the filter circuit that generates the additional transmission zero includes:

[0050] a parallel resonance generating unit, the parallel resonance generating unit is used to generate resonance;

[0051] The parallel resonance unit inc...

Embodiment 3

[0060] On the basis of the above-mentioned embodiments, Embodiment 3 of the present invention provides a filter circuit for generating additional transmission zeros, wherein the parallel resonance generating unit further includes a first inductor, and the first inductor is connected in series on the first branch; the parallel resonance generating unit It also includes a second capacitor, the second capacitor is connected between the common connection point of the second end of the second branch and the second end of the third branch and the ground; the parasitic element is connected to the second end of the second branch Between the common connection point of the two terminals and the second terminal of the third branch and the ground; the filter circuit for generating additional transmission zeros is suitable for low-pass filters.

[0061] Figure 10 It is a circuit diagram of a filter circuit that generates additional transmission zeros provided by Embodiment 3 of the presen...

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PUM

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Abstract

The embodiment of the invention discloses a filter circuit for generating an extra transmission zero point and a filter, and the filter circuit comprises a parallel resonance generation unit which isused for generating resonance, the parallel resonance unit comprises a first branch connected between an input port and an output port, a second branch and a third branch, a first end of the second branch is connected with a first end of the first branch, a first end of the third branch is connected with a second end of the first branch, a second end of the second branch is connected with a secondend of the third branch and grounded, the second branch and the third branch are connected with inductors in series or capacitors in series, and a parasitic element exists between a common connectionpoint of a second end of the second branch and a second end of the third branch and the ground. By utilizing parasitic parameters of the parasitic element, an extra transmission zero point can be generated on the premise of not increasing extra devices, the suppression degree of the filter is improved, the device cost is reduced, and the occupied space is reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of filters, and in particular, to a filter circuit and filter for generating additional transmission zeros. Background technique [0002] The filter can effectively filter the frequency point of a specific frequency in the power line or frequencies other than this frequency point to obtain a power signal of a specific frequency or eliminate a power signal of a specific frequency. In order to obtain a higher degree of rejection in filter design, it is often necessary to use a resonant unit to generate a transmission zero. [0003] In general, a resonant unit is composed of a capacitor and an inductance. To increase the transmission zero point of the filter, it is necessary to increase the number of components to form a resonant unit. Increasing the number of components leads to higher cost of the filter and larger space occupation. . Contents of the invention [0004] Embodiments of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/46
CPCH03H9/46
Inventor 程伟左成杰何军
Owner ANHUI ANUKI TECH CO LTD
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