CN115694395A - Broadband phase shift circuit - Google Patents
Broadband phase shift circuit Download PDFInfo
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- CN115694395A CN115694395A CN202211308510.6A CN202211308510A CN115694395A CN 115694395 A CN115694395 A CN 115694395A CN 202211308510 A CN202211308510 A CN 202211308510A CN 115694395 A CN115694395 A CN 115694395A
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Abstract
The invention discloses a broadband phase shift circuit, comprising: the second path comprises a grounding inductor, and the grounding inductor is additionally arranged on the basis of a third-order all-pass network of the second path. By adopting the technical scheme, a larger advanced phase is provided, the phase nonlinearity of a low-frequency end is compensated, the spread bandwidth is wide, the loss of a network is reduced, the structure is simple, the size is small, the mass production is convenient, and the production cost is saved.
Description
Technical Field
The invention relates to the field of radio frequency microwave integrated circuits, in particular to a broadband phase-shifting circuit.
Background
The microwave phase shifter is a microwave control circuit, and is mainly used for controlling the phase of a microwave signal so as to meet the needs of a system. The phase shifter has wide application in the fields of phased array radar, microwave communication, satellite technology and the like. Particularly in a phased array radar system, a phase shifter is a key device of a T/R component, and the performance of the phase shifter plays an important role in the whole radar system.
At present, monolithic integrated phase shifter circuits for realizing large phase shift quantity mainly comprise transmission type and reflection type. The transmission-type phase shifter is of a common structure and has an all-pass network structure, particularly a broadband phase shifter based on a magnetic coupling all-pass network structure, the phase shift path and the reference path of the transmission-type phase shifter both select the all-pass network structure, but in order to realize larger phase shift, a multistage all-pass network circuit needs to be continuously cascaded, and the inductance capacitance value of the all-pass network in a phase shift state is increased, so that the loss and the volume of the network are increased.
Disclosure of Invention
The invention provides a novel design idea of a broadband phase-shifting circuit, and aims to provide a larger lead phase to compensate phase nonlinearity of a low frequency band by arranging a grounding inductor in a reference path, and widen the bandwidth, thereby reducing the loss and the volume of a network.
The technical scheme is as follows: the invention provides a broadband phase shift circuit, comprising: a first path, a second path, a first single pole double throw switch and a second single pole double throw switch, wherein: the fixed end of the first single-pole double-throw switch is the input end of the broadband phase-shifting circuit, the first moving end of the first single-pole double-throw switch is connected with the input end of the first channel, and the second moving end of the first single-pole double-throw switch is connected with the input end of the second channel; the fixed end of the second single-pole double-throw switch is the output end of the broadband phase-shifting circuit, the first moving end of the second single-pole double-throw switch is connected with the output end of the first channel, and the second moving end of the first single-pole double-throw switch is connected with the output end of the second channel; the first path comprises a first inductor, a second inductor and a first grounding capacitor, wherein a first end of the first inductor and a first end of the second inductor are respectively used as an input end and an output end of the first path; the second circuit comprises a third inductor, a fourth inductor, a second grounding capacitor and a grounding inductor, wherein the first end of the third inductor and the first end of the fourth inductor are respectively used as the input end and the output end of the second circuit, the second end of the third inductor and the second end of the fourth inductor are connected to form a second grounding connection point, the first end of the second grounding capacitor is connected with the second grounding connection point, the second end of the second grounding capacitor is grounded, and the grounding inductor and the second grounding capacitor are connected in series or in parallel.
In an embodiment, a capacitor is disposed on a line between the first end of the first inductor and the first end of the second inductor. Further, a capacitor may be disposed on a line between the first end of the third inductor and the first end of the fourth inductor. Optionally, an inductor may be disposed on a line between the first end of the third inductor and the first end of the fourth inductor.
In another embodiment, an inductor is disposed on a line between the first end of the first inductor and the first end of the second inductor. Further, a capacitor may be disposed on a line between the first end of the third inductor and the first end of the fourth inductor. Optionally, an inductor may be disposed on a line between the first end of the third inductor and the first end of the fourth inductor.
Further, the first single-pole double-throw switch and the second single-pole double-throw switch may adopt a series-tube switch structure, a parallel-tube switch structure or a series-parallel tube switch structure.
Specifically, the first single-pole double-throw switch circuit and the second single-pole double-throw switch circuit are switched to select the first path or the second path as a transmission path.
Compared with the prior art, the invention has the following remarkable advantages: the phase-shift keying filter has the advantages that a larger advanced phase is provided, phase nonlinearity of a low frequency band is compensated, the bandwidth is widened, the loss of a network is reduced, the structure is simple, the size is small, mass production is facilitated, the production cost is saved, and the fixed research and development idea of expanding the bandwidth in the industry is turned.
Drawings
FIG. 1 is a schematic diagram of a wideband phase shift circuit according to the present invention;
FIGS. 2 to 7 are schematic structural diagrams of various embodiments of a wideband phase shift circuit according to the present invention;
fig. 8 is a schematic structural diagram of an embodiment of the present invention in which series-parallel MOS transistors are used as a single-pole double-throw switch;
FIG. 9 is a simulation curve of 90-degree phase shift in the frequency band of 4 to 20GHz using the wideband phase shift circuit provided by the present invention;
FIG. 10 is a simulation curve of insertion loss of 90 degree phase shift in the frequency band of 4 to 20GHz using the broadband phase shift circuit provided by the present invention;
FIG. 11 is a simulation curve of a 90-degree phase shift input/output standing wave in a frequency band of 4 to 20GHz using the broadband phase shift circuit provided by the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Referring to fig. 1, it is a schematic structural diagram of a wideband phase shift circuit provided in the present invention; fig. 2 to fig. 7 are schematic structural diagrams of multiple embodiments of the wideband phase shift circuit according to the present invention.
According to one aspect of the present invention, a wideband phase shift circuit is provided. Fig. 1 shows a specific embodiment of a wideband phase shift circuit, and as shown in fig. 1, the wideband phase shift circuit includes a first path, a second path, a first SPDT 1 and a second SPDT 2.
The fixed end 1 of the first single-pole double-throw switch SPDT 1 is an input end of the broadband phase shift circuit, the first moving end 2 of the first single-pole double-throw switch SPDT 1 is connected with an input end of the first access, and the second moving end 3 of the first single-pole double-throw switch SPDT 1 is connected with an input end of the second access.
The fixed end 1 of the second single-pole double-throw switch SPDT 2 is the output end of the broadband phase-shifting circuit, the first moving end 2 of the second single-pole double-throw switch SPDT 2 is connected with the output end of the first access, and the second moving end 3 of the first single-pole double-throw switch SPDT 1 is connected with the output end of the second access.
The first path comprises a first inductor L1, a second inductor L2 and a first grounding capacitor C2, a first end 1 of the first inductor L1 and a first end 1 of the second inductor L2 are respectively used as an input end and an output end of the first path, a second end 2 of the first inductor L1 and a second end 2 of the second inductor L2 are connected to form a first grounding connection point, a first end of the first grounding capacitor C2 is connected with the first grounding connection point, and a second end of the first grounding capacitor C2 is grounded.
The second path comprises a third inductor L3, a fourth inductor L4, a second grounding capacitor C4 and a grounding inductor L5, a first end 1 of the third inductor L3 and a first end 1 of the fourth inductor L4 are respectively used as an input end and an output end of the second path, a second end 2 of the third inductor L3 and a second end 2 of the fourth inductor L4 are connected to form a second grounding connection point, a first end of the second grounding capacitor C4 is connected with the second grounding connection point, a second end of the second grounding capacitor C4 is grounded, and the grounding inductor L5 is connected with the second grounding capacitor C4 in parallel.
In a specific implementation, the first inductor L1 and the second inductor L2 are wound together according to a required coupling coefficient K1 and inductance values L1 and L2, and ends of the first inductor L1 and the second inductor L2 are connected after being wound together, the connection point is connected to one end of the first grounded capacitor C2, and the other end of the first grounded capacitor C2 is grounded. The third inductor L3 and the fourth inductor L4 are mutually wound according to a required coupling coefficient K2 and inductance values L3 and L4, the tail ends of the mutually wound inductors are connected, the connecting point is connected with one end of a second grounding capacitor C4, and the other end of the second grounding capacitor C4 is grounded.
It is understood that either the first path or the second path can be selected as the transmission path by switching the first single pole double throw switch and the second single pole double throw switch. The selection of the output phase can be realized through the switching of the first path and the second path, so that the broadband phase shifting is realized.
In the prior art, under the condition that the phase shift path and the reference path both select the all-pass network structure, in order to realize larger phase shift, a common choice is to continuously increase the inductance value and/or the capacitance value in the network, that is, to continuously increase the inductance and the capacitance, so that the loss and the volume of the network are both increased, and under the condition that the inductance value and/or the capacitance value are not increased, the phase shift amount is smaller, and the actual application effect is not ideal. However, in the invention, the grounding inductor is loaded in the reference path, and compared with a phase shifting scheme which adopts a full-pass network without adding the grounding inductor, the phase shifting circuit further provides a larger advanced phase (which can reach 90 degrees), widens the bandwidth, reduces the loss and the volume of the whole phase shifting circuit, has a simple and compact structure, and can reduce the area by 1/3. And due to the structural simplification, the performance of the circuit is more stable, the mass production is convenient, and the production cost is saved.
In another embodiment, as shown in fig. 2, the embodiment shown in fig. 2 differs from the embodiment shown in fig. 1 in that the ground inductance L5 in the second path is connected in series with a second ground capacitance C4.
In a specific embodiment, the grounding inductor L5 is connected in series with the second grounding capacitor C4, and may be that the second grounding capacitor C4 is connected to a second grounding connection point, and the grounding inductor L5 is grounded by the grounding inductor L5 after the grounding inductor L5 is connected in series with the second grounding capacitor C4; the grounding inductor L5 may be connected to the second grounding connection point, and the second grounding capacitor C4 may be grounded by the second grounding capacitor C4 after being connected in series to the grounding inductor L5.
In a further embodiment, as shown in fig. 3, the embodiment shown in fig. 3 differs from the embodiment shown in fig. 1 in that a capacitor C3 may be provided in the line between the first terminal 1 of the third inductor L3 and the first terminal 1 of the fourth inductor L4.
In another embodiment, as shown in fig. 4, the embodiment shown in fig. 4 differs from the embodiment shown in fig. 3 in that a capacitor C1 may be provided in the line between the first terminal 1 of the first inductor L1 and the first terminal 1 of the second inductor L2.
It is understood that in other embodiments, the capacitor C1 shown in fig. 4 may be replaced by a capacitor.
In a further embodiment, as shown in fig. 5, the embodiment shown in fig. 5 differs from the embodiment shown in fig. 1 in that an inductance L6 may be provided in the line between the first terminal 1 of the first inductance L1 and the first terminal 1 of the second inductance L2.
In another embodiment, as shown in fig. 6, the embodiment shown in fig. 6 differs from the embodiment shown in fig. 5 in that an inductance L7 may be provided in the line between the first terminal 1 of the third inductance L3 and the first terminal 1 of the fourth inductance L4.
In yet another embodiment, as shown in fig. 7, the embodiment shown in fig. 7 differs from the embodiment shown in fig. 1 in that an inductor L6 may be disposed in a line between the first end 1 of the first inductor L1 and the first end 1 of the second inductor L2, and a capacitor C3 may be disposed in a line between the first end 1 of the third inductor L3 and the first end 1 of the fourth inductor L4.
It will be appreciated that the embodiment shown in figure 2 may be modified accordingly with reference to the embodiments shown in figures 3 to 7. In summary, on the basis of the embodiment shown in fig. 1 or fig. 2, an inductor or a capacitor may be disposed on a line between the first end 1 of the first inductor L1 and the first end 1 of the second inductor L2 and/or a line between the first end 1 of the third inductor L3 and the first end 1 of the fourth inductor L4.
In each embodiment of the invention, the coupling capacitance or coupling inductance design variable is added in the coupling inductance network, so that the realization of higher coupling strength is facilitated, and the design flexibility is improved.
In an embodiment of the present invention, the first single-pole double-throw switch SPDT 1 and the second single-pole double-throw switch SPDT 2 may adopt a serial-tube switch structure, a parallel-tube switch structure, or a serial-parallel tube switch structure. Fig. 8 is a schematic structural diagram of an embodiment of the invention in which series-parallel MOS transistors are used as a single-pole double-throw switch.
In specific implementation, the switching transistors M1 to M8 may be FET transistors or MOS transistors as appropriate.
The result simulation is carried out by arbitrarily selecting the embodiment, the simulation result is shown in fig. 9-11, as shown in fig. 9, the phase shift precision of the broadband phase shifter is very high in the frequency band of 5 to 20GHz, and the phase shift errors of 90-degree phase shift amount are all smaller than +/-1 degree; as shown in fig. 10, the insertion loss is less than 2.7dB in the 5 to 20GHz band; as shown in fig. 11, in the frequency band of 5 to 20GHz, the ground state input/output standing wave and the phase-shifted state input/output standing wave are better than 1.4.
Claims (9)
1. A wideband phase shift circuit, comprising: a first path, a second path, a first single pole double throw switch, and a second single pole double throw switch, wherein:
the fixed end of the first single-pole double-throw switch is the input end of the broadband phase-shifting circuit, the first moving end of the first single-pole double-throw switch is connected with the input end of the first channel, and the second moving end of the first single-pole double-throw switch is connected with the input end of the second channel;
the fixed end of the second single-pole double-throw switch is the output end of the broadband phase-shifting circuit, the first moving end of the second single-pole double-throw switch is connected with the output end of the first channel, and the second moving end of the first single-pole double-throw switch is connected with the output end of the second channel;
the first path comprises a first inductor, a second inductor and a first grounding capacitor, wherein a first end of the first inductor and a first end of the second inductor are respectively used as an input end and an output end of the first path;
the second circuit comprises a third inductor, a fourth inductor, a second grounding capacitor and a grounding inductor, wherein the first end of the third inductor and the first end of the fourth inductor are respectively used as the input end and the output end of the second circuit, the second end of the third inductor and the second end of the fourth inductor are connected to form a second grounding connection point, the first end of the second grounding capacitor is connected with the second grounding connection point, the second end of the second grounding capacitor is grounded, and the grounding inductor and the second grounding capacitor are connected in series or in parallel.
2. The wideband phase shift circuit of claim 1, wherein a capacitor is provided in a line between the first terminal of the first inductor and the first terminal of the second inductor.
3. The wideband phase shifting circuit of claim 2, wherein a capacitance is provided in the line between the first end of the third inductor and the first end of the fourth inductor.
4. The wideband phase shifting circuit of claim 2, wherein an inductor is disposed in a line between the first end of the third inductor and the first end of the fourth inductor.
5. The wideband phase shift circuit of claim 1, wherein an inductor is disposed in a line between the first end of the first inductor and the first end of the second inductor.
6. The wideband phase shifting circuit of claim 5, wherein a capacitor is placed in line between the first terminal of the third inductor and the first terminal of the fourth inductor.
7. The wideband phase shifting circuit of claim 5, wherein an inductor is provided in a line between the first end of the third inductor and the first end of the fourth inductor.
8. The wideband phase shifting circuit of claim 1, wherein the first and second single-pole double-throw switches are in a cascode, a parallel or a series-parallel configuration.
9. The wideband phase shift circuit according to claim 8, wherein the first path or the second path is selected as the transmission path by switching the first single-pole double-throw switch circuit and the second single-pole double-throw switch circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211308510.6A CN115694395A (en) | 2022-10-25 | 2022-10-25 | Broadband phase shift circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211308510.6A CN115694395A (en) | 2022-10-25 | 2022-10-25 | Broadband phase shift circuit |
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| Publication Number | Publication Date |
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| CN115694395A true CN115694395A (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211308510.6A Pending CN115694395A (en) | 2022-10-25 | 2022-10-25 | Broadband phase shift circuit |
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| CN (1) | CN115694395A (en) |
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