CN117525799A - Compact power divider with high isolation - Google Patents
Compact power divider with high isolation Download PDFInfo
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- CN117525799A CN117525799A CN202410010433.9A CN202410010433A CN117525799A CN 117525799 A CN117525799 A CN 117525799A CN 202410010433 A CN202410010433 A CN 202410010433A CN 117525799 A CN117525799 A CN 117525799A
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- power divider
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- 238000002955 isolation Methods 0.000 title claims abstract description 74
- 239000003990 capacitor Substances 0.000 claims description 65
- 239000002184 metal Substances 0.000 claims description 7
- 239000000470 constituent Substances 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 7
- 230000010354 integration Effects 0.000 abstract description 6
- 238000004088 simulation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
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- Semiconductor Integrated Circuits (AREA)
Abstract
The invention discloses a compact power divider with high isolation, which comprises: a signal input port; the first end of the first inductor is electrically connected with the signal input port; a first end of the first on-chip spiral inductor is electrically connected with a second end of the first inductor; the first signal output port is electrically connected with the second end of the spiral inductor on the first chip; the first end of the second on-chip spiral inductor is electrically connected with the second end of the first inductor; the second signal output port is electrically connected with the second end of the second on-chip spiral inductor; the first end of the isolation unit is electrically connected with the first signal output port, and the second end of the isolation unit is electrically connected with the second signal output port. The technical scheme provided by the invention can solve the technical problem that the power distributor in the prior art is difficult to adapt to the development trend of high integration of a radio frequency system, and has higher isolation.
Description
Technical Field
The invention relates to the field of radio frequency integrated circuits, in particular to a compact power distributor with high isolation.
Background
A Power divider (Power divider) is a device that divides one input signal energy into two or more paths of equal or unequal energy, and can also combine multiple paths of signal energy into one path of output in reverse.
In radio frequency systems, therefore, a power divider can play a critical role, which can divide an input signal to multiple antennas, amplifiers, filters, etc. But with the rapid development of wireless communication technology, the performance requirements of the radio frequency system on the power divider are becoming higher and higher.
Conventional power splitters, such as wilkinson power splitters, use transmission lines with an electrical length of 90 degrees, resulting in a larger structural area, which is difficult to adapt to the development trend of high integration of the radio frequency system.
Disclosure of Invention
The invention provides a compact power distributor with high isolation, which aims to effectively solve the technical problem that the power distributor with high isolation in the prior art is difficult to adapt to the development trend of high integration of a radio frequency system.
According to a first aspect of the present invention, there is provided a compact power divider with high isolation, comprising: a signal input port; the first end of the first inductor is electrically connected with the signal input port; a first on-chip spiral inductor, a first end of the first on-chip spiral inductor being electrically connected to a second end of the first inductor; the first signal output port is electrically connected with the second end of the spiral inductor on the first chip; the first end of the second on-chip spiral inductor is electrically connected with the second end of the first inductor; the second signal output port is electrically connected with the second end of the second on-chip spiral inductor; and the first end of the isolation unit is electrically connected with the first signal output port, and the second end of the isolation unit is electrically connected with the second signal output port.
Further, the compact power divider with high isolation further comprises: a first capacitor; the first end of the first capacitor is electrically connected with the signal input port, and the second end of the first capacitor is grounded.
Further, the isolation unit includes: a second capacitor and a first resistor; the first end of the second capacitor is electrically connected with the first signal output port, and the second end of the second capacitor is electrically connected with the first end of the first resistor; the second end of the first resistor is electrically connected with the second signal output port.
Further, the compact power divider with high isolation further comprises: a third capacitor; the first end of the third capacitor is electrically connected with the first signal output port, and the second end of the third capacitor is grounded.
Further, the compact power divider with high isolation further comprises: a fourth capacitor; the first end of the fourth capacitor is electrically connected with the second signal output port, and the second end of the fourth capacitor is grounded.
Further, the compact power divider with high isolation further comprises: and the isolation belt is grounded and annularly surrounds the whole periphery of the power divider except the isolation belt, and the whole periphery is formed by all components.
Further, the separator is at a distance of at least 12 μm from the whole in each direction.
Further, the constituent metal wires of the spiral inductor are arranged in a quadrilateral spiral.
Through one or more of the above embodiments of the present invention, at least the following technical effects can be achieved:
compared with the traditional power divider, the technical scheme disclosed by the invention uses the on-chip spiral inductor with small area occupation ratio to replace a part of wavelength transmission line with large area occupation ratio, and carries out adaptive design, so that the area of the power divider is reduced under the condition that the performance of the power divider is not reduced, and the isolation units are used for isolating output signals of two signal output ends, thereby improving the isolation degree of the power divider.
Drawings
The technical solution and other advantageous effects of the present invention will be made apparent by the following detailed description of the specific embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a circuit diagram of a compact power divider with high isolation according to an embodiment of the present invention;
FIG. 2 is a top view of a compact power divider with high isolation according to an embodiment of the present invention;
FIG. 3 is a graph of simulation results of the reflection coefficients of the input and output ports of the compact power divider with high isolation according to the embodiment of the present invention;
FIG. 4 is a graph of the insertion loss simulation results for a compact power divider with high isolation provided by an embodiment of the present invention;
fig. 5 is a diagram of simulation results of isolation between output ports of a compact power divider with high isolation according to an embodiment of the present invention.
Reference numerals:
IN, signal input port; OUT1, a first signal output port; OUT2, a second signal output port; l, a first inductor; l1, a spiral inductor on a first sheet; l2, a second on-chip spiral inductor; 1. an isolation unit; 2. a separator; c1, a first capacitor; c2, a second capacitor; c3, a third capacitor; c4, a fourth capacitor; r1, a first resistor;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and defined otherwise, the term "and/or" herein is merely an association relationship describing associated objects, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. The character "/" herein generally indicates that the associated object is an "or" relationship unless otherwise specified.
The power divider plays a key role in the radio frequency system and is responsible for dividing the input signal to a plurality of antenna, amplifier, filter and other components. With the rapid development of wireless communication technology, the performance requirements of the radio frequency system on the power divider are higher and higher.
In a radio frequency system, different circuit modules need to operate simultaneously, but high-frequency signals interfere with each other, which results in performance degradation. Therefore, the power divider needs to have high isolation, that is, high-efficiency signal isolation is realized between different output ports, because the higher the isolation of the ports is, the smaller the mutual influence among the branches is, and the higher the stability and reliability of the system are, that is, if one branch breaks down in the working process, the higher the isolation of the ports can ensure that other branches are not greatly affected. The traditional power divider, such as the wilkinson power divider, has higher isolation, larger structural area and does not accord with the development trend of high integration of the radio frequency system.
Based on the above technical problems, the embodiments of the present application provide a compact power divider with high isolation, which can solve the technical problem that the power divider in the prior art is difficult to adapt to the development trend of high integration of a radio frequency system. The method comprises the following steps:
referring to fig. 1, an embodiment of the present application provides a compact power divider with high isolation, including: the signal input port IN, the first inductor L, the first on-chip spiral inductor L1, the first signal output port OUT1, the second on-chip spiral inductor L2, the second signal output port OUT2 and the isolation unit 1. Wherein, the first end of the first inductance L is electrically connected with the signal input port IN; the first end of the spiral inductor L1 on the first chip is electrically connected with the second end of the first inductor L; the first signal output port OUT1 is electrically connected with the second end of the spiral inductor L1 on the first chip; the first end of the second on-chip spiral inductor L2 is electrically connected with the second end of the first inductor L; the second signal output port OUT2 is electrically connected with a second end of the second on-chip spiral inductor L2; the first end of the isolation unit 1 is electrically connected with the first signal output port OUT1, and the second end of the isolation unit 1 is electrically connected with the second signal output port OUT 2.
In this embodiment, the on-chip spiral inductor with small area ratio is used to replace the wavelength transmission line with large area ratio, and adaptive design is performed, so that the area of the power divider is reduced without reducing the performance of the power divider. Taking the wilkinson structure as an example, the 1/4 wavelength transmission line in the wilkinson structure needs to be converted into a first on-chip spiral inductor L1 and a second on-chip spiral inductor L2.
In one embodiment, the compact power divider with high isolation further comprises: a first capacitor C1; the first end of the first capacitor C1 is electrically connected to the signal input port IN, and the second end of the first capacitor C1 is grounded.
IN this embodiment, the first capacitor C1 is connected IN parallel to the signal input port IN, so that standing waves of the input port can be improved, and the power divider is more accurate.
In one embodiment, the isolation unit 1 includes: a second capacitor C2 and a first resistor R1; a first end of the second capacitor C2 is electrically connected to the first signal output port OUT1, and a second end of the second capacitor C2 is electrically connected to a first end of the first resistor R1; the second end of the first resistor R1 is electrically connected to the second signal output port OUT 2.
In this embodiment, the first resistor R1 plays a role of isolating the first output port and the second output port, and a capacitor is connected in series at the first resistor R1, so that resonance can be performed with mutual inductance of the first on-chip spiral inductor L1 and the second on-chip spiral inductor L2, and isolation between the output ports is greatly improved.
In one embodiment, the compact power divider with high isolation further comprises: a third capacitor C3; the first end of the third capacitor C3 is electrically connected to the first signal output port OUT1, and the second end of the third capacitor C3 is grounded.
In this embodiment, the third capacitor C3 can play a role in output matching, and the standing wave of the first output port can be adjusted by adjusting the capacitance value of the third capacitor C3, so that the accuracy of the power divider is improved.
In one embodiment, the compact power divider with high isolation further comprises: a fourth capacitor C4;
the first end of the fourth capacitor C4 is electrically connected to the second signal output port OUT2, and the second end of the fourth capacitor C4 is grounded.
In this embodiment, the fourth capacitor C4 can play a role in output matching, and the standing wave of the second output port can be adjusted by adjusting the capacitance value of the fourth capacitor C4, so that the accuracy of the power divider is improved. In addition, the fourth capacitor C4 of the embodiment and the third capacitor C3 of the foregoing embodiment are used in combination, so that standing waves of output signals of the power divider can be minimized, and the accuracy of the power divider is further improved.
In addition, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 in the above embodiment all adopt the plate capacitor (MIM) manufactured in the Bicmos8hp process, and such capacitors have relatively precise capacitance values and better stability.
Specifically, the compact power divider with high isolation described in the above embodiment takes 27.5 to 31ghz as an example, and its working principle is as follows:
the signal is input from the input end IN, passes through the first inductor L, then equally enters the on-chip spiral inductors L1 and L2, and then is equally output through the output port OUT1 and the output port OUT2 respectively. The first capacitor C1 is mainly used for input matching, and the value of the first capacitor C1 is adjusted to enable the standing wave of the input port to reach the minimum value at 27.5-31 GHz; the third capacitor C3 and the fourth capacitor C4 mainly play a role in output matching in the scheme, and the standing wave energy of an output signal at 27.5-31 GHz can be minimized by adjusting the capacitance values of the two capacitors; in the circuit, the isolation between the first signal output port OUT1 and the second signal output port OUT2 is improved through the first resistor R1 and the second capacitor C2.
In addition, mutual inductance resonance generated between the second capacitor C2 connected in series with the first resistor R1 and the two on-chip spiral inductors is added in the scheme, so that the isolation degree is improved. The optimal isolation is obtained by adjusting the capacitance value of the second capacitor C2 and the resistance value of the first resistor R1.
In one embodiment, the compact power divider with high isolation further comprises: and the isolation belt 2 is grounded, and surrounds the whole periphery of the compact power distributor with high isolation, except the isolation belt 2, which is formed by all components.
In the present embodiment, by providing the grounded barrier 2, the mutual influence between different circuits is reduced. In the above embodiment, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4, which are grounded, are all connected to the isolation belt 2, and are grounded through the isolation belt 2.
In one embodiment, the separator 2 is spaced from the whole by x in all directions, where x is greater than or equal to 12 μm. The isolation belt 2 thus provided can reduce the influence between different circuits.
In addition, the area of the compact power divider with high isolation may also refer to fig. 2, i.e., the area of the annular isolation belt 2 may be 193 μm×136 μm.
And the constituent metal wires of the spiral inductors of the first on-chip spiral inductor L1 and the second on-chip spiral inductor L2 are arranged in a quadrilateral spiral.
In this embodiment, the substrate is implemented with a thick metal layer AM (Additive Manufacturing, metal additive manufacturing) layer in the Bicmos8hp process, which can reduce the loss of the power divider. And the metal wires are spirally wired according to the quadrangle, so that the circuit area can be greatly reduced, and the higher circuit integration level is achieved.
Experiments are also carried out on the compact power divider with high isolation, as shown in fig. 3, 4 and 5, fig. 3 is a simulation result diagram of the reflection coefficient of the input and output ports of the compact power divider with high isolation, which shows that the input and output matching of the power divider in the embodiment reaches a better value, and the reflection coefficient is better than-17 dB; fig. 4 is a graph showing the simulation result of the insertion loss of the power divider in this embodiment, and it can be seen from the graph that the insertion loss is lower and better than 0.8dB due to the use of a thicker metal layer to implement the on-chip spiral inductor in the power divider; fig. 5 is a diagram of simulation results of isolation between output ports of the power divider in this embodiment, and it can be seen from the diagram that, because the output ports adopt a capacitor-resistor series structure, there is a better isolation between the ports, and the isolation between the output ports is greater than 25dB in 27.5-31 ghz.
In summary, although the present invention has been described in terms of the preferred embodiments, the preferred embodiments are not limited to the above embodiments, and various modifications and changes can be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is defined by the appended claims.
Claims (8)
1. A compact power divider with high isolation comprising:
a signal input port (IN);
a first inductor (L), a first end of which is electrically connected to the signal input port (IN);
a first on-chip spiral inductor (L1), a first end of the first on-chip spiral inductor (L1) being electrically connected to a second end of the first inductor (L);
a first signal output port (OUT 1) electrically connected with a second end of the spiral inductor (L1) on the first chip;
a second on-chip spiral inductor (L2), a first end of the second on-chip spiral inductor (L2) being electrically connected to a second end of the first inductor (L);
a second signal output port (OUT 2) electrically connected to a second end of the second on-chip spiral inductor (L2);
and the first end of the isolation unit (1) is electrically connected with the first signal output port (OUT 1), and the second end of the isolation unit (1) is electrically connected with the second signal output port (OUT 2).
2. A compact power divider with high isolation according to claim 1,
the power divider further comprises: a first capacitor (C1);
a first end of the first capacitor (C1) is electrically connected with the signal input port (IN), and a second end of the first capacitor (C1) is grounded.
3. A compact power divider with high isolation according to claim 1,
the isolation unit (1) comprises: a second capacitor (C2) and a first resistor (R1);
a first end of the second capacitor (C2) is electrically connected with the first signal output port (OUT 1), and a second end of the second capacitor (C2) is electrically connected with a first end of the first resistor (R1);
a second end of the first resistor (R1) is electrically connected to the second signal output port (OUT 2).
4. A compact power divider with high isolation according to claim 1,
the power divider further comprises: a third capacitor (C3);
the first end of the third capacitor (C3) is electrically connected with the first signal output port (OUT 1), and the second end of the third capacitor (C3) is grounded.
5. A compact power divider with high isolation according to claim 1,
the power divider further comprises: a fourth capacitance (C4);
the first end of the fourth capacitor (C4) is electrically connected with the second signal output port (OUT 2), and the second end of the fourth capacitor (C4) is grounded.
6. A compact power divider with high isolation according to claim 1,
the power divider further comprises: and the isolation belt (2) is grounded, and surrounds the whole periphery formed by all components except the isolation belt (2) of the power distributor in a ring shape.
7. A compact power divider with high isolation according to claim 6,
the separator (2) is at a distance of at least 12 μm from the whole in all directions.
8. A compact power divider with high isolation according to claim 1,
the constituent metal wires of the spiral inductor are arranged in a quadrilateral spiral manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410010433.9A CN117525799B (en) | 2024-01-04 | 2024-01-04 | Compact power divider with high isolation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410010433.9A CN117525799B (en) | 2024-01-04 | 2024-01-04 | Compact power divider with high isolation |
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| CN117525799A true CN117525799A (en) | 2024-02-06 |
| CN117525799B CN117525799B (en) | 2024-06-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100004440A (en) * | 2008-07-03 | 2010-01-13 | 광운대학교 산학협력단 | Power divider and combiner using lumped elements |
| CN102498612A (en) * | 2009-03-30 | 2012-06-13 | Rf智能公司 | Radio frequency power divider and combiner circuit |
| US20190214700A1 (en) * | 2018-01-08 | 2019-07-11 | Linear Technology Holding Llc | Wilkinson combiner with coupled inductors |
| CN110022151A (en) * | 2017-11-21 | 2019-07-16 | 英飞凌科技股份有限公司 | For operating method, voltage controlled oscillator and the integrated circuit of voltage controlled oscillator |
| CN114497954A (en) * | 2022-01-24 | 2022-05-13 | 北京无线电测量研究所 | Power divider and system |
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- 2024-01-04 CN CN202410010433.9A patent/CN117525799B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100004440A (en) * | 2008-07-03 | 2010-01-13 | 광운대학교 산학협력단 | Power divider and combiner using lumped elements |
| CN102498612A (en) * | 2009-03-30 | 2012-06-13 | Rf智能公司 | Radio frequency power divider and combiner circuit |
| CN110022151A (en) * | 2017-11-21 | 2019-07-16 | 英飞凌科技股份有限公司 | For operating method, voltage controlled oscillator and the integrated circuit of voltage controlled oscillator |
| US20190214700A1 (en) * | 2018-01-08 | 2019-07-11 | Linear Technology Holding Llc | Wilkinson combiner with coupled inductors |
| CN114497954A (en) * | 2022-01-24 | 2022-05-13 | 北京无线电测量研究所 | Power divider and system |
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