CN111884623A - Radio frequency difference phase shift quadrature circuit - Google Patents
Radio frequency difference phase shift quadrature circuit Download PDFInfo
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- CN111884623A CN111884623A CN202010635856.1A CN202010635856A CN111884623A CN 111884623 A CN111884623 A CN 111884623A CN 202010635856 A CN202010635856 A CN 202010635856A CN 111884623 A CN111884623 A CN 111884623A
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- 230000010363 phase shift Effects 0.000 title claims abstract description 62
- 239000003990 capacitor Substances 0.000 claims description 66
- 239000004020 conductor Substances 0.000 claims description 12
- 238000002955 isolation Methods 0.000 abstract description 14
- 230000001629 suppression Effects 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000003786 synthesis reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
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Abstract
The invention discloses a radio frequency difference phase shift orthogonal circuit, which comprises: the in-phase two-way distributor comprises an in-phase two-way distributor, a first phase shift circuit and a second phase shift circuit; the first phase shift circuit and the second phase shift circuit are respectively connected to two output ends of the in-phase two-way distributor, so that the output signals of the in-phase two-way distributor are subjected to phase shift, and the phase difference of the two output signals after phase shift is kept to be 90 degrees. The differential phase shift orthogonal circuit uses two phase shift circuits to shift the phase of two paths of output of an in-phase two-path distributor, keeps the phase difference at 90 degrees, can improve the isolation performance between two paths, improves the isolation performance between stages, can also improve the harmonic suppression of a power amplifier to a certain extent, and improves the performance of the power amplifier.
Description
Technical Field
The invention relates to the technical field of radio frequency circuits, in particular to a radio frequency difference phase shift quadrature circuit.
Background
In a radio frequency power amplifier, two-way distribution/synthesizers are widely used, synthesis modes such as Wilkinson and magic T are generally adopted, the circuit mode adopts in-phase synthesis, the in-phase synthesis generally has poor isolation between two ways, and the isolation between one stage and the other stage is also poor.
Disclosure of Invention
In view of the isolation problem between the homodromous synthesis of the homodromous two-way distributor in the prior art, the invention provides the radio frequency difference phase shift quadrature circuit so as to overcome the problem.
In order to achieve the purpose, the invention adopts the following technical scheme:
a radio frequency differential phase shift quadrature circuit, the circuit comprising: the in-phase two-way distributor comprises an in-phase two-way distributor, a first phase shift circuit and a second phase shift circuit;
the first phase shift circuit and the second phase shift circuit are respectively connected to two output ends of the in-phase two-way distributor, so that the output signals of the in-phase two-way distributor are subjected to phase shift, and the phase difference of the two output signals after phase shift is kept to be 90 degrees.
Optionally, the first phase shift circuit comprises: the first coaxial cable, the first inductor, the second inductor, the first capacitor and the second capacitor;
the core wire of the first end of the first coaxial cable is connected with the first output end of the in-phase two-way distributor, the outer conductor of the first end of the first coaxial cable is connected with the ground, the core wire of the second end of the first coaxial cable is respectively connected with the first end of the first capacitor and the first end of the first inductor, the outer conductor of the second end of the first coaxial cable is respectively connected with the first end of the second inductor and the first end of the second capacitor, the second end of the first capacitor is connected with the ground, the second end of the first inductor is connected with the second end of the second capacitor and serves as a first port of radio frequency output, and the second end of the second inductor is connected with the ground.
Optionally, the second phase shift circuit comprises: the second coaxial cable, the third inductor, the fourth inductor, the third capacitor and the fourth capacitor;
the core wire of the first end of the second coaxial cable is connected with the second output end of the in-phase two-way distributor, the outer conductor of the first end of the second coaxial cable is connected with the ground, the core wire of the second end of the second coaxial cable is respectively connected with the first end of the third capacitor and the first end of the third inductor, the outer conductor of the second end of the second coaxial cable is respectively connected with the first end of the fourth inductor and the first end of the fourth capacitor, the second end of the third capacitor is connected with the ground, the second end of the third inductor is connected with the second end of the fourth capacitor and serves as a second port of the radio frequency output, and the second end of the fourth inductor is connected with the ground.
Optionally, the first coaxial cable and the second coaxial cable are the same length.
Optionally, the impedances of the first coaxial cable and the second coaxial cable are the same, and the impedance of the coaxial inductor is the same as the impedance of the output end of the in-phase two-way divider.
Optionally, the first inductor and the second inductor have the same size, and the first capacitor and the second capacitor have the same size.
Optionally, the third inductor and the fourth inductor have the same size, and the third capacitor and the fourth capacitor have the same size.
Optionally, the first coaxial cable and the second coaxial cable have an impedance of Z0The initial frequency of the in-phase two-way distributor is f1The termination frequency of the in-phase two-way distributor is f2Then, the center frequency of the in-phase two-way divider is:
recording unknown numbers a and x:
calculating a first frequency:
then, the capacitance value C of the first capacitor1And the capacitance value C of the second capacitor2Comprises the following steps:
inductance L of the first inductor1And inductance L of the second inductor2Comprises the following steps:
optionally, the second frequency is calculated: f. of02＝xf0；
Then, the capacitance value C of the third capacitor3And the capacitance value C of the fourth capacitor4Comprises the following steps:
inductance L of the third inductor3And inductance L of the fourth inductor4Comprises the following steps:
in conclusion, the beneficial effects of the invention are as follows:
the differential phase shift orthogonal circuit uses two phase shift circuits to shift the phase of two paths of output of an in-phase two-path distributor, keeps the phase difference at 90 degrees, can improve the isolation performance between two paths, improves the isolation performance between stages, can also improve the harmonic suppression of a power amplifier to a certain extent, and improves the performance of the power amplifier.
Drawings
Fig. 1 is a schematic diagram illustrating an overall structure of a radio frequency difference phase shift quadrature circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a radio frequency difference phase shift quadrature circuit according to another embodiment of the present invention;
in the figure, 110, an in-phase two-way distributor; 120. a first phase shift circuit; 130. a second phase shift circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The technical conception of the invention is as follows: based on the orthogonal synthesis idea of the in-phase two-way distributor, the two phase-shifting circuits are used for shifting the phase of two paths of output of the in-phase two-way distributor to form a differential phase-shifting orthogonal circuit, the phase difference after phase shifting is kept at 90 degrees, the isolation performance between two paths of radio frequency signals can be improved, the isolation performance between stages can be improved, the harmonic suppression of a power amplifier can be improved to a certain degree, and the performance of the power amplifier is improved.
Fig. 1 is a schematic diagram of an overall structure of a radio frequency difference phase shift quadrature circuit according to an embodiment of the present invention.
As shown in fig. 1, a radio frequency difference phase shift quadrature circuit includes: an in-phase two-way divider 110, a first phase shift circuit 120, and a second phase shift circuit 130.
The first phase shift circuit 120 and the second phase shift circuit 130 are respectively connected to two output terminals of the in-phase two-way divider 110, so that the output signals of the in-phase two-way divider 110 are phase-shifted, and the phase difference of the two output signals after phase shifting is kept at 90 °. Therefore, through the phase difference quadrature, the isolation performance between two paths of radio frequency signals can be improved, the isolation performance between stages can be improved, the harmonic suppression of the power amplifier can be improved to a certain degree, and the performance of the power amplifier can be improved.
Fig. 2 is a schematic structural diagram of a radio frequency difference phase shift quadrature circuit according to another embodiment of the present invention.
As shown in fig. 2, in this embodiment, to solve the problem of poor isolation performance between two paths of the existing rf in-phase two-path distributor, a phase shift circuit formed by a coaxial cable, a capacitor, and an inductor is added to two paths of outputs of the in-phase two-path distributor, so that the relative phase difference between two paths of rf signals is 90 °.
The first phase shift circuit 120 includes: the inductive switch comprises a first coaxial cable, a first inductor L1, a second inductor L2, a first capacitor C1 and a second capacitor C2. The core wire of the first end of the first coaxial cable is connected with the first output end of the in-phase two-way divider, the outer conductor of the first end of the first coaxial cable is connected with the ground, the core wire of the second end of the first coaxial cable is respectively connected with the first end of the first capacitor C1 and the first end of the first inductor L1, the outer conductor of the second end of the first coaxial cable is respectively connected with the first end of the second inductor L2 and the first end of the second capacitor C2, the second end of the first capacitor C1 is connected with the ground, the second end of the first inductor L1 is connected with the second end of the second capacitor C2, the first end is used as a first port of radio frequency output, and the second end of the second inductor L2 is connected with the ground.
The second phase shift circuit 130 includes: a second coaxial cable, a third inductor L3, a fourth inductor L4, a third capacitor C3, and a fourth capacitor C4. The core wire of the first end of the second coaxial cable is connected with the second output end of the in-phase two-way divider, the outer conductor of the first end of the second coaxial cable is connected with the ground, the core wire of the second end of the second coaxial cable is respectively connected with the first end of the third capacitor C3 and the first end of the third inductor L3, the outer conductor of the second end of the second coaxial cable is respectively connected with the first end of the fourth inductor L4 and the first end of the fourth capacitor C4, the second end of the third capacitor C3 is connected with the ground, the second end of the third inductor L3 is connected with the second end of the fourth capacitor C4, the second end of the third inductor L3 is used as a second port of the radio frequency output, and the second end of the fourth inductor L4 is connected with the ground.
In this embodiment, the first phase shift circuit 120 and the second phase shift circuit 130 both include a coaxial cable, two inductors, and two capacitors, and have the same structure, such a structure is simple, low cost, and stable performance, and certainly, the values of the capacitance and the inductance in the first phase shift circuit 120 and the second phase shift circuit 130 are different.
In one embodiment of the present application, the lengths of the first coaxial cable and the second coaxial cable are the same, so that the parameters of the coaxial cables are the same as the operating state, and the performance of the control circuit is stable.
In one embodiment of the present application, the impedances of the first coaxial cable and the second coaxial cable are the same, and the impedances of the first coaxial cable and the second coaxial cable are the same as the impedance of the output end of the in-phase two-way divider, facilitating impedance matching.
In one embodiment of the present application, the first inductor L1 and the second inductor L2 are the same size, and the first capacitor C1 and the second capacitor C2 are the same size.
In one embodiment of the present application, the third inductor L3 and the fourth inductor L4 are the same size, and the third capacitor C3 and the fourth capacitor C4 are the same size.
In an embodiment of the present application, the magnitudes of the capacitance and the inductance in the first phase shift circuit and the second phase shift circuit are calculated by the following method:
let the impedance of the first coaxial cable and the second coaxial cable be Z0The starting frequency of the in-phase two-way divider is f1The end frequency of the in-phase two-way divider is f2Then, the center frequency of the in-phase two-way divider is:
recording unknown numbers a and x:
calculating a first frequency:
then, the capacitance value C of the first capacitor C11And the capacitance value C of the second capacitor C22Comprises the following steps:
inductance L of the first inductor L11And the inductance L of the second inductor L22Comprises the following steps:
and calculating to obtain the sizes of the first inductor L1, the second inductor L2, the first capacitor C1 and the second capacitor C2, thus obtaining the composition of the first phase-shifting circuit.
Then, a second frequency is calculated: f. of02＝xf0；
Then, the capacitance value C of the third capacitor C33And the capacitance value C of the fourth capacitor C44Comprises the following steps:
inductance L of the third inductor L33And inductance L of the fourth inductor L44Comprises the following steps:
and calculating to obtain the sizes of the third inductor L3, the fourth inductor L4, the third capacitor C3 and the fourth capacitor C4, thus obtaining the composition of the second phase-shifting circuit.
By using the parameter calculation method, the radio frequency difference phase shift orthogonal circuit can be obtained, two paths of signals of the in-phase two-path distributor are subjected to phase shift, and the phase difference after phase shift is ensured to be f1～f2The frequency band is 90 degrees, and orthogonal synthesis is realized. Of course, due to engineeringThe error is realized, and the phase difference is generally 90 degrees +/-10 degrees in practical use.
To sum up, the phase-shifting circuit phase-shifts two paths of outputs of the in-phase two-path distributor by using two phase-shifting circuits based on the orthogonal synthesis idea of the in-phase two-path distributor to form a differential phase-shifting orthogonal circuit, and keeps the phase difference after phase shifting at 90 degrees, so that the isolation performance between two paths of radio frequency signals can be improved, the isolation performance between stages can be improved, the harmonic suppression of a power amplifier can be improved to a certain degree, and the performance of the power amplifier can be improved. Moreover, two phase shift circuits of this application adopt the same structure, all include a coaxial cable, two inductances and two electric capacities, and coaxial cable's length and impedance are the same, such circuit structure is simple, and is with low costs, and the stable performance is convenient for realize moreover.
While the foregoing is directed to embodiments of the present invention, other modifications and variations of the present invention may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present invention, and the scope of the present invention should be determined by the scope of the appended claims.
Claims (9)
1. A radio frequency differential phase shift quadrature circuit, the circuit comprising: the in-phase two-way distributor comprises an in-phase two-way distributor, a first phase shift circuit and a second phase shift circuit;
the first phase shift circuit and the second phase shift circuit are respectively connected to two output ends of the in-phase two-way distributor, so that the output signals of the in-phase two-way distributor are subjected to phase shift, and the phase difference of the two output signals after phase shift is kept to be 90 degrees.
2. The radio frequency differential phase-shifting quadrature circuit of claim 1, wherein the first phase-shifting circuit comprises: the first coaxial cable, the first inductor, the second inductor, the first capacitor and the second capacitor;
the core wire of the first end of the first coaxial cable is connected with the first output end of the in-phase two-way distributor, the outer conductor of the first end of the first coaxial cable is connected with the ground, the core wire of the second end of the first coaxial cable is respectively connected with the first end of the first capacitor and the first end of the first inductor, the outer conductor of the second end of the first coaxial cable is respectively connected with the first end of the second inductor and the first end of the second capacitor, the second end of the first capacitor is connected with the ground, the second end of the first inductor is connected with the second end of the second capacitor and serves as a first port of radio frequency output, and the second end of the second inductor is connected with the ground.
3. The radio frequency differential phase-shifting quadrature circuit of claim 2 wherein the second phase-shifting circuit comprises: the second coaxial cable, the third inductor, the fourth inductor, the third capacitor and the fourth capacitor;
the core wire of the first end of the second coaxial cable is connected with the second output end of the in-phase two-way distributor, the outer conductor of the first end of the second coaxial cable is connected with the ground, the core wire of the second end of the second coaxial cable is respectively connected with the first end of the third capacitor and the first end of the third inductor, the outer conductor of the second end of the second coaxial cable is respectively connected with the first end of the fourth inductor and the first end of the fourth capacitor, the second end of the third capacitor is connected with the ground, the second end of the third inductor is connected with the second end of the fourth capacitor and serves as a second port of the radio frequency output, and the second end of the fourth inductor is connected with the ground.
4. The radio frequency differential phase-shift quadrature circuit of claim 3, wherein the lengths of the first coaxial cable and the second coaxial cable are the same.
5. The radio frequency difference phase-shift quadrature circuit of claim 4 wherein the impedances of the first and second coaxial cables are the same, and the impedance of the coaxial inductor is the same as the impedance of the output of the in-phase two-way divider.
6. The radio frequency difference phase shift quadrature circuit of claim 5 wherein the first inductor and the second inductor are the same size and the first capacitor and the second capacitor are the same size.
7. The radio frequency difference phase shift quadrature circuit of claim 6 wherein the third inductor and the fourth inductor are the same size and the third capacitor and the fourth capacitor are the same size.
8. The radio frequency differential phase-shift quadrature circuit of claim 7, wherein the impedance of the first coaxial cable and the second coaxial cable is Z0The initial frequency of the in-phase two-way distributor is f1The termination frequency of the in-phase two-way distributor is f2Then, the center frequency of the in-phase two-way divider is:
recording unknown numbers a and x:
calculating a first frequency:
then, the capacitance value C of the first capacitor1And the capacitance value C of the second capacitor2Comprises the following steps:
inductance L of the first inductor1And inductance L of the second inductor2Comprises the following steps:
9. the radio frequency difference phase-shift quadrature circuit of claim 8,
calculating a second frequency: f. of02＝xf0；
Then, the capacitance value C of the third capacitor3And the capacitance value C of the fourth capacitor4Comprises the following steps:
inductance L of the third inductor3And inductance L of the fourth inductor4Comprises the following steps:
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