WO2023221319A1

WO2023221319A1 - Frequency divider

Info

Publication number: WO2023221319A1
Application number: PCT/CN2022/114380
Authority: WO
Inventors: 王晓东; 左成杰; 何军
Original assignee: 安徽安努奇科技有限公司
Priority date: 2022-05-19
Filing date: 2022-08-24
Publication date: 2023-11-23
Also published as: CN114826251A

Abstract

Disclosed in the present invention is a frequency divider. The frequency divider comprises at least two filtering units, a first end of each filtering unit is connected to a first end of the frequency divider, and a second end of each filtering unit serves as a second end of the frequency divider; each filtering unit comprises at least one inductance element, and the signal transmission directions of the two inductance elements at adjacent positions are opposite.

Description

frequency divider

This application claims priority to the Chinese patent application with application number 202210554547.0, which was submitted to the China Patent Office on May 19, 2022. The entire content of this application is incorporated into this application by reference.

Technical field

This application relates to the field of signal processing technology, for example, to a frequency divider.

Background technique

The frequency divider has the function of carrier aggregation. In modern communications, as the demand for carrier aggregation functions increases, frequency dividers are used more and more widely, making frequency dividers with low insertion loss and high isolation (duplexers, triplexers, multiplexers, etc.) The demand is increasing. In related technologies, the filters of different channels in the frequency divider may be inductor-capacitor filters (LC filters). In a frequency divider where the passband and stopband are relatively close to each other (for example, 100-200MHz), it is necessary to ensure the insertion loss requirements of the frequency divider and at the same time ensure the isolation requirements between different channels of the frequency divider. , which is a huge challenge for the design of LC filters in frequency dividers.

Contents of the invention

This application provides a frequency divider to improve the isolation between different channels of the frequency divider.

The present application provides a frequency divider, including at least two filter units, the first end of each filter unit is connected to the first end of the frequency divider, and the second end of each filter unit serves as a second end of the frequency divider;

Each filter unit includes at least one inductor element, and the signal transmission directions of two adjacent inductor elements are opposite.

Description of the drawings

Figure 1 is a schematic structural diagram of a frequency divider provided by an embodiment of the present application;

Figure 2 is a schematic diagram of a partial layout plan structure of a frequency divider provided by an embodiment of the present application;

Figure 3 is a schematic diagram of a partial layout plan structure of another frequency divider provided by an embodiment of the present application;

Figure 4 is a schematic diagram of a partial layout plan structure of another frequency divider provided by an embodiment of the present application;

Figure 5 is a schematic diagram of a partial layout plan structure of another frequency divider provided by an embodiment of the present application;

FIG. 6 is a schematic diagram of a partial layout plan structure of another frequency divider provided by an embodiment of the present application.

Detailed ways

The present application will be described below in conjunction with the drawings and embodiments. The specific embodiments described herein are merely illustrative of the application. For convenience of description, only parts relevant to the present application are shown in the drawings.

Figure 1 is a schematic structural diagram of a frequency divider provided by an embodiment of the present application. As shown in Figure 1, the frequency divider includes at least two filter units 110. The first end of each filter unit 110 is connected to the first end C1 of the frequency divider. The second end of each filter unit 110 serves as a frequency divider. A second end C2 of the filter; each filter unit 110 includes at least one inductor element L1, and the signal transmission directions of two adjacent inductor elements L1 are opposite.

The filtering unit 110 may be an LC filter. The types of filters corresponding to different filtering units 110 may be the same or different to meet the working requirements of the frequency divider. The filter type may include multiple types. For example, the filter may be at least one of a low-pass filter, a high-pass filter, and a band-stop filter. The first end of each filter unit 110 is connected to the first end C1 of the frequency divider, and the second end of each filter unit 110 serves as a second end C2 of the frequency divider, so that each filter unit 110 is connected in series with the frequency divider. between the first terminal C1 and a second terminal C2, and serves as a channel of the frequency divider. Exemplarily, as shown in FIG. 1 , the frequency divider exemplarily shows that it includes a plurality of filter units 110 , the first end of each filter unit 110 is connected to the first end C1 of the frequency divider, and the first filter unit 110 is connected to the first end C1 of the frequency divider. The second end of the unit 110 serves as the first second end C21 of the frequency divider, the second end of the second filter unit 110 serves as the second second end C22 of the frequency divider, and the second end of the nth filter unit 110 The two terminals serve as the second second terminal C2n of the frequency divider. At this time, the frequency divider has n channels, and each channel corresponds to a filter unit 110.

FIG. 2 is a schematic diagram of a partial layout plan structure of a frequency divider provided by an embodiment of the present application. As shown in FIG. 2 , each filtering unit 110 includes at least one inductance element L1 , and each filtering unit 110 includes at least one capacitance element (not shown in FIG. 2 ), so that each filtering unit 110 passes the inductance L1 and the capacitance element. form a filter. When each filter unit 110 includes at least one inductor element L1, the overall structure of the frequency divider includes at least two inductor elements L1. In the layout design, the signal transmission directions of the two adjacent inductor elements L1 are opposite, so that The magnetic fields generated by the two adjacent inductance elements L1 are in opposite directions, thereby reducing the mutual interference between the magnetic fields generated by the two adjacent inductance elements L1, thereby reducing the mutual interference between the filter units 110. Improved isolation between different channels of the frequency divider. Among them, the isolation between different channels of the frequency divider is used to characterize the degree of mutual interference between different channels. The higher the isolation between different channels of the frequency divider, the lower the degree of mutual interference between different channels of the frequency divider. When each filter unit 110 in at least one filter unit 110 includes at least two inductor elements L1, the two inductor elements L1 at adjacent positions may be two inductor elements in the same filter unit 110, or they may be different filter units. Two inductive components in 110.

For example, as shown in Figure 2, the frequency divider includes two filter units 110, each filter unit 110 includes an inductor element L1, and the two inductor elements L1 are arranged adjacently in the layout, that is, the two inductor elements L1 Set adjacent in space. By setting the signal transmission direction of one inductance element L1 to be counterclockwise, and the signal transmission direction of the other inductance element L1 to be clockwise, at this time the signal transmission direction is counterclockwise. The direction of the magnetic field generated by the inductance element L1 is equal to the signal transmission direction. The direction of the magnetic field generated by the clockwise inductive element L1 is opposite, which can reduce the mutual interference between the magnetic fields generated by the two inductive elements L1, thereby reducing the mutual interference between the filter units 110, and improving the efficiency of the frequency divider. Isolation between different channels.

In the technical solution of this embodiment, by setting the signal transmission directions of two adjacent inductive elements in the frequency divider to be opposite, the mutual interference between the magnetic fields generated by the two adjacent inductive elements can be reduced, and thus the mutual interference can be reduced. Reduce mutual interference between filter units and improve the isolation between different channels of the frequency divider.

Continuing to refer to Figure 2, the inductor element L1 has a winding structure; when the winding directions of the two adjacent inductor elements L1 are the same, the winding starting ends of the two adjacent inductor elements L1 are the signal input end and the signal end respectively. output terminal.

The inductance element L1 may be a winding structure. For example, the winding structure may be a conductive coil. The winding direction of the two inductor elements L1 at adjacent positions may be the same. Figure 2 exemplarily shows that the winding direction of the two inductor elements L1 at adjacent positions is counterclockwise from outside to inside, or The winding direction of the two adjacent inductance elements L1 is clockwise from the inside to the outside. At this time, the winding starting end of one of the two inductance elements L1 at the adjacent position is the signal input end, the winding end is the signal output end, and the other inductance of the two inductance elements L1 at the adjacent position is The winding starting end of element L1 is the signal output end, and the winding end end is the signal input end. This can make one of the signal transmission directions of the two adjacent inductance elements L1 the same as the winding direction, and the other one is the same as the winding direction. One signal transmission direction is opposite to the winding direction, thereby causing the signal transmission directions of two adjacent inductance elements L1 to be opposite, reducing mutual interference between the magnetic fields generated by the two adjacent inductance elements L1. The winding start end is the external starting end when the inductor L1 is wound from outside to inside, and the winding end is the internal end of the inductor L1 when it is wound from outside to inside. Alternatively, the winding start end is the internal starting end when the inductor element L1 is wound from the inside out, and the winding end end is the external end end when the inductor element L1 is wound from the inside out.

In other embodiments, the winding direction of the two adjacent inductor elements L1 can also be clockwise from outside to inward. In this case, the winding directions of the two adjacent inductor elements L1 are also the same. There are no restrictions anywhere.

FIG. 3 is a schematic diagram of a partial layout plan structure of another frequency divider provided by an embodiment of the present application. As shown in Figure 3, the inductance element L1 has a winding structure; the winding directions of the two adjacent inductance elements L1 are opposite, and the winding starting ends of the two adjacent inductance elements L1 are both signal input ends or both. is the signal output terminal.

The winding directions of two inductor elements L1 at adjacent positions may be opposite. Figure 3 exemplarily shows that the winding direction of one inductor element L1 among the two inductor elements L1 at adjacent positions is from outside to inside and is reversed. The winding direction is clockwise (or the winding direction is clockwise from inside to outside), and the winding direction of the other inductor element L1 is clockwise from outside to inside (or the winding direction is counterclockwise from inside to outside). , at this time, the winding starting ends of the two adjacent inductance elements L1 are both signal input ends, and the winding end ends are both signal output ends; or the winding starting ends of the two adjacent inductance elements L1 are both The signal output end and the winding end end are both signal input ends. The signal transmission direction in different inductance elements L1 is consistent with the winding direction of the inductance element L1, so that the signal transmission direction of the inductance element L1 with the opposite winding direction is opposite. Reduce the mutual interference between the magnetic fields generated by the two adjacent inductance elements L1.

FIG. 4 is a schematic diagram of a partial layout plan structure of another frequency divider provided by an embodiment of the present application. As shown in FIG. 4 , each filter unit 110 in at least one filter unit 110 includes at least two inductor elements L1 . In the same filter unit 110 , the signal transmission directions of two inductor elements L1 at adjacent positions are opposite.

FIG. 4 exemplarily shows that a filter unit 110 may include two inductor elements L1. The two inductor elements L1 may be arranged adjacent in space. That is, the two inductor elements L1 in adjacent positions are the same filter unit 110. two inductive components. At this time, the signal transmission directions of the two adjacent inductance elements L1 in the same filter unit 110 can be set to be opposite, so that the magnetic fields generated by the two inductance elements L1 are in opposite directions, thereby reducing the generation of the magnetic fields generated by the two adjacent inductance elements L1. The mutual interference between the magnetic fields can improve the isolation of the filter unit 110, that is, the channel isolation of the frequency divider can be improved. At the same time, the interference of the filter unit 110 to other filter units 110 can be reduced, thereby improving the isolation between different channels of the frequency divider.

FIG. 4 only illustrates that a filter unit 110 includes two inductor elements L1 , and the two inductor elements L1 in a filter unit 110 achieve opposite signal transmission directions through opposite winding directions. In other embodiments, the two inductance elements L1 in a filter unit 110 can also achieve opposite signal transmission directions by winding the starting ends to be the signal input end and the signal output end respectively. In addition, one filter unit 110 may include multiple inductance elements L1, and the multiple inductance elements L1 may be arranged adjacent to each other in spatial positions. In this case, two inductance elements L1 at adjacent positions among the multiple inductance elements L1 may be arranged. The signal transmission direction is opposite. Alternatively, in other embodiments, each filter unit 110 of the at least two filter units 110 includes at least two inductor elements L1. In this case, the at least two inductor elements L1 of each filter unit 110 may be set at a spatial position. When set adjacently, the signal transmission direction is opposite.

FIG. 5 is a schematic diagram of a partial layout plan structure of another frequency divider provided by an embodiment of the present application. As shown in Figure 5, the signal transmission directions of the inductance elements L1 in the two adjacent filter units 110 are opposite; wherein, at least two filter units 110 are arranged along the first direction X, and the two adjacent filter units 110 are arranged in the first direction X. 110 represents two filter units arranged adjacently along the first direction X, and the first direction X is the intersection direction in which the first end C1 of the frequency divider points to the second end C2.

FIG. 5 exemplarily shows that two inductance elements L1 at adjacent positions are two inductance elements in adjacent filter units 110 . When two filter units 110 are arranged adjacently, the inductance elements L1 in the adjacent filter units 110 can be arranged adjacently in spatial position. In this case, the signal transmission directions of the inductance elements L1 in the adjacent filter units 110 can be set to be opposite, The directions of the magnetic fields generated by the two inductance elements L1 are opposite, so that the mutual interference between the magnetic fields generated by the two inductance elements L1 can be reduced, and the isolation between the filter units 110 can be improved.

FIG. 5 only shows by way of example that the frequency divider includes two filter units 110 . In other embodiments, the frequency divider may include multiple filter units 110 , and the multiple filter units 110 are arranged along the first direction X and are adjacent two by two. At this time, the signal transmission directions of the inductive elements L1 in the two adjacent filter units 110 can be set to be opposite.

Continuing to refer to FIG. 5 , the number of inductance elements L1 in two adjacent filter units 110 is the same, and the inductance elements L1 in different filter units 110 are arranged along the first direction X; The signal transmission direction of the adjacent inductance element L1 is opposite.

FIG. 5 exemplarily shows that the number of inductive elements L1 in two adjacent filter units 110 is two. At least one inductor element L1 in each filter unit 110 may be arranged along the same direction. Then each inductor element L1 in the filter unit 110 has adjacent elements in the arrangement direction of the inductor elements L1 in different filter units 110 . Inductor element L1, and two adjacent inductor elements L1 belong to different filtering units 110. By having opposite signal transmission directions of two adjacent inductance elements L1 in the arrangement direction of the inductance elements L1 provided in different filtering units 110 , at least one inductance element L1 in different filtering units 110 can be configured with the adjacent inductance element L1 in different filtering units 110 . The signal transmission direction of the inductor element L1 is opposite, so that the two inductor elements L1 in different filter units 110 can generate magnetic fields with opposite magnetic field directions to each other, thereby better reducing the mutual interference between the magnetic fields generated by the two inductor elements L1 , improve the isolation between the filter units 110, that is, improve the isolation between different channels of the frequency divider. For example, each filter unit 110 includes two inductance elements L1, which are arranged along the second direction Y. The second direction Y is the direction in which the first end C1 of the frequency divider points to the second end C2. The inductance elements L1 in different filtering units 110 are arranged along the first direction X, so that all the inductance elements L1 in the different filtering units 110 can be arranged in a matrix along the first direction X may be a row direction, and the second direction Y may be a column direction. At this time, the signal transmission directions of two adjacent inductance elements L1 in the same row in different filter units 110 can be set to be opposite, so that all inductance elements L1 in the same filter unit 110 can communicate with the signals of the adjacent inductance elements L1 The transmission directions are opposite, so that the two inductance elements L1 in different filter units 110 can generate magnetic fields with opposite magnetic field directions to each other, thereby better reducing the mutual interference between the magnetic fields generated by the two inductance elements L1 and improving the efficiency of the filter unit 110 degree of isolation between them.

FIG. 5 exemplarily shows that there are two inductive elements L1 in each filter unit 110 . In other embodiments, the number of inductive elements L1 in each filter unit 110 may be multiple, as long as the number of inductive elements L1 in different filter units 110 is the same.

FIG. 6 is a schematic diagram of a partial layout plan structure of another frequency divider provided by an embodiment of the present application. As shown in Figure 6, the number of inductance elements L11 in two adjacent filter units 110 is different, and the inductance elements L1 in the same filter unit 110 are arranged along the second direction Y; a filter unit 110 includes at least one first Inductor element L11. The filter unit 110 arranged adjacent to a filter unit 110 includes at least two second inductor elements L12. The vertical projection of the first inductor element L11 on the vertical plane in the first direction X and a second inductor element L12 The overlapping area of the vertical projection on the vertical plane in the first direction X is larger than the vertical projection of the first inductor element L11 on the vertical plane in the first direction The overlapping area of the vertical projection, the signal transmission direction of the first inductor element L11 and the second inductor element L12 is opposite; wherein, the second direction Y is the direction in which the first end C1 of the frequency divider points to the second end C2.

What is different from Figure 5 is that the number of inductive elements L1 in the two filter units 110 at adjacent positions is different. At this time, at least one inductor element L1 in different filter units 110 has no adjacent inductor element L1 in the arrangement direction of the inductor elements L1 in different filter units 110 . At this time, it can be determined based on the overlapping area of the vertical projections of different inductor elements L1 on the vertical plane in the first direction , then when the inductance elements L1 in different filter units 110 are arranged adjacently, the signal transmission directions of the two inductance elements L1 are opposite, so that the inductance elements L1 in different filter units 110 can generate more magnetic fields with opposite magnetic field directions to each other. , thereby better reducing the mutual interference between the magnetic fields generated by the two inductance elements L1 and improving the isolation between the filter units 110, that is, improving the isolation between different channels of the frequency divider. Exemplarily, FIG. 6 exemplarily shows that the frequency divider includes two filter units 110, one of which includes a first inductor element L11, and the other filter unit 110 includes two second inductor elements L12. The first inductor element L11 and the second inductor element L12 are arranged along the first direction X, and the two second inductor elements L12 are arranged along the second direction Y. The overlapping area of the vertical projections of the first inductor element L11 and the first second inductor element L12 on the vertical plane in the first direction The overlapping area of the vertical projection on the vertical plane, then it can be determined that the first inductor element L11 and the first second inductor element L12 are two inductor elements arranged adjacently in different filter units 110. At this time, the first inductor can be set The signal transmission directions of the element L11 and the first and second inductance element L12 are opposite, so that the directions of the magnetic fields generated by the first inductance element L11 and the first and second inductance element L12 are opposite, which can better reduce the generation of the two inductance elements L1. The mutual interference between the magnetic fields improves the isolation between the filter units 110.

Based on the above technical solution, the filter unit includes at least one conductive layer, and the at least one conductive layer is configured to form an inductor element.

The inductive element in the filter unit can be formed by a conductive layer. Exemplarily, the conductive layer may be a metal layer. When the filter unit includes a conductive layer, the inductor element is formed in the conductive layer. At this time, the inductor element is a two-dimensional inductor, which is beneficial to simplifying the formation process of the inductor element. When the filter unit includes at least two conductive layers, the inductor element can be formed in at least two conductive layers. In this case, the inductor element is a three-dimensional inductor, which is beneficial to reducing the area occupied by the inductor element.

Claims

A frequency divider includes at least two filter units, the first end of each filter unit is connected to the first end of the frequency divider, and the second end of each filter unit serves as a third end of the frequency divider. two ends;

Each filter unit includes at least one inductor element, and the signal transmission directions of two adjacent inductor elements are opposite.
The frequency divider according to claim 1, wherein each filter unit in at least one filter unit includes at least two inductor elements, and in the same filter unit, the signal transmission directions of two inductor elements at adjacent positions are opposite.
The frequency divider according to claim 1 or 2, wherein the signal transmission directions of the inductive elements in the two filter units at adjacent positions are opposite; at least two filter units are arranged along the first direction, and the two filter units at adjacent positions have opposite directions. Each filter unit is two filter units arranged adjacently along the first direction, and the first direction is the intersection direction in which the first end of the frequency divider points to the second end of the frequency divider.
The frequency divider according to claim 3, wherein the number of inductive elements in two adjacent filter units is the same, and the inductive elements in different filter units are arranged along the first direction; The signal transmission direction of adjacent inductive elements arranged in one direction is opposite.
The frequency divider according to claim 3, wherein the number of inductance elements in two adjacent filter units is different, and the inductance elements in the same filter unit are arranged along the second direction; a filter unit includes at least a first An inductor element. The filter unit arranged adjacent to the filter unit includes at least two second inductor elements. The vertical projection of the first inductor element on the vertical plane in the first direction is consistent with a second inductor element. The overlapping area of the vertical projection on the vertical plane in the first direction is greater than the vertical projection of the first inductor element on the vertical plane in the first direction and the area of the other second inductor element in the first direction. The overlapping area of the vertical projection on the vertical plane, the signal transmission direction of the first inductor element and the second inductor element is opposite; wherein the second direction is when the first end of the frequency divider points to the The direction of the second end of the frequency divider.
The frequency divider according to claim 1, wherein the inductance element is a winding structure; when the winding directions of the two inductance elements at adjacent positions are the same, the two inductance elements at adjacent positions are The starting ends of the winding are respectively the signal input end and the signal output end.
The frequency divider according to claim 1, wherein the inductance element is a winding structure; when the winding directions of the two inductance elements at adjacent positions are opposite, the two inductance elements at adjacent positions are The starting ends of the winding are all signal input ends or all are signal output ends.
The frequency divider of claim 1, wherein the filter unit includes at least one conductive layer, the at least one conductive layer being configured to form the inductance element.