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Filter circuit suitable for LTCC filter

A filter circuit and filter technology, applied in the field of filters, can solve problems such as difficulty in implementation, and achieve the effects of compact layout, reduced number, and reduced space occupied by inductors

Pending Publication Date: 2019-11-22
CHENGDU HONGMING & UESTC NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inductance value distribution range is large, from 3.8nH to 63nH. For the LTCC process, the inductance of 63nH and 22nH is particularly difficult to realize in a compact and small volume, and unexpected coupling will inevitably occur and affect the characteristics of the filter.

Method used

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  • Filter circuit suitable for LTCC filter
  • Filter circuit suitable for LTCC filter
  • Filter circuit suitable for LTCC filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as Figure 4 As shown, this embodiment provides a filter circuit suitable for LTCC filters, including a second-order elliptic function band-pass unit, and the second-order elliptic function band-pass unit includes a first capacitor C1, a second capacitor C2, and a third capacitor C3, fourth capacitor C4, fifth capacitor C5, sixth capacitor C6, seventh capacitor C7, first inductance L1, second inductance L2, third inductance L3, fourth inductance L4, fifth inductance L5, sixth inductance L6, the seventh inductor L7, and the eighth inductor L8.

[0028] The first end of the first inductor L1, the first end of the second capacitor C2, and the first end of the second inductor L2 are all connected to the first end of the third capacitor C3, and the second end of the first inductor L1 And the second end of the second capacitor C2 is connected to the first end of the first capacitor C1, and the second end of the second inductor L2 is connected to the first end of the thi...

Embodiment 2

[0033] Such as Figure 5 As shown, this embodiment provides a filter circuit suitable for LTCC filters, including a first-order elliptic function band-pass unit, and the first-order elliptic function band-pass unit includes a first capacitor C1, a second capacitor C2, and a third capacitor C3, the fourth capacitor C4, the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4. The first end of the first inductor L1, the first end of the second capacitor C2, and the first end of the second inductor L2 are all connected to the first end of the third capacitor C3, and the second end of the first inductor L1 And the second end of the second capacitor C2 is connected to the first end of the first capacitor C1, the second end of the second inductance L2 is connected to the first end of the third inductance L3 and the first end of the fourth inductance L4, The second end of the first capacitor C1 and the second end of the third inductor L3 are c...

Embodiment 3

[0036] Such as Image 6 As shown, this embodiment provides a filter circuit suitable for LTCC filters, including a third-order elliptic function band-pass unit, and the third-order elliptic function band-pass unit includes a first capacitor C1, a second capacitor C2, and a third capacitor C3, fourth capacitor C4, fifth capacitor C5, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8, ninth capacitor C9, tenth capacitor C10, first inductor L1, second inductor L2, third inductor L3, fourth inductor L4, fifth inductor L5, sixth inductor L6, seventh inductor L7, eighth inductor L8, ninth inductor L9, tenth inductor L10, eleventh inductor L11, twelfth inductor L12.

[0037] The first end of the first inductor L1, the first end of the second capacitor C2, and the first end of the second inductor L2 are all connected to the first end of the third capacitor C3, and the second end of the first inductor L1 And the second end of the second capacitor C2 is connected to the fir...

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Abstract

The invention relates to the technical field of filters, and discloses a filter circuit suitable for an LTCC filter. The filter circuit comprises an elliptic function band-pass unit. The elliptic function band-pass unit comprises a plurality of inductors and capacitors which are connected with one another. According to the invention, the layout mode of each inductor in the existing elliptic function filter circuit is changed; the inductors connected in series are converted into inductors connected to the ground in parallel; a pi-type inductance network is converted into a T-type inductance network. The inductance network is converted; according to the LTCC filter, implicit equivalent inductance is generated through coupling between the inductors, a T-shaped inductance network is formed, the number of actual inductors is reduced, the inductance value distribution range is reduced. Meanwhile, through coupling between the inductors, compact layout of the LTCC filter is facilitated, the space occupied by the inductors is reduced, and therefore the performance of the LTCC filter is improved.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a filter circuit suitable for LTCC filters. Background technique [0002] LTCC low temperature co-fired ceramic (Low Temperature Co-fired Ceramic) technology has become the mainstream technology of passive integration. LTCC filters are widely used for their compact structure and small size. It uses multi-layer ceramic printing metal paste to realize inductance and capacitance. In essence, most LTCC filters are LC filters (that is, realized by distinguishable inductors and capacitors), and the larger the inductance value of the inductor, the larger the space occupied, and the easier the coupling between inductors occurs , so that the characteristics of the filter deviate from the original design prototype. Therefore, the design of the LTCC filter will tend to reduce the inductance value and reduce the number of inductors. [0003] The circuit schematic diagram of the elliptic f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/01
CPCH03H7/0161H03H7/0115
Inventor 何泽涛郭绪跃谢波李军王兴才
Owner CHENGDU HONGMING & UESTC NEW MATERIALS