CN117439553A - Analog predistortion structure with independently adjustable amplitude and phase - Google Patents
Analog predistortion structure with independently adjustable amplitude and phase Download PDFInfo
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- CN117439553A CN117439553A CN202311501225.0A CN202311501225A CN117439553A CN 117439553 A CN117439553 A CN 117439553A CN 202311501225 A CN202311501225 A CN 202311501225A CN 117439553 A CN117439553 A CN 117439553A
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- schottky barrier
- barrier diode
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/48—Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source
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Abstract
The invention discloses an analog predistortion structure with independently adjustable amplitude and phase, which comprises a circulator, a Wilkinson power divider, a first nonlinear reflection branch consisting of a first blocking capacitor and a first Schottky barrier diode, and a second nonlinear reflection branch consisting of a second blocking capacitor and a second Schottky barrier diode; the circulator is connected with the Wilkinson power divider through a first tuning transmission line; the wilkinson power divider is respectively connected with the first nonlinear reflection branch circuit and the second nonlinear reflection branch circuit. The analog predistortion structure circuit has simple structure and can improve the nonlinearity of TWTA. On the basis, the relative independent adjustment of the amplitude and the phase compensation amount of the synthesized vector signal can be realized by adjusting the bias voltages of the two nonlinear branches, and the applicability and the flexibility of the structure are improved.
Description
Technical Field
The invention belongs to the technical field of microwave power amplifiers, and particularly relates to an analog predistortion structure with independently adjustable amplitude and phase.
Background
With the application of millimeter wave communication technology in satellite communication, satellite communication technology has been rapidly developed. Human use of spectrum resources in satellite communications is increasingly saturated. Spectral resources are becoming more and more valuable, and people put higher demands on their speed, quality and efficiency.
In satellite systems, payloads associated with data communications are required to perform processing operations such as amplification, frequency conversion, filtering, etc., of radio frequency signals, which are the most critical components. The traveling wave tube power amplifier (TWTA) becomes the most main amplifying device used in the satellite electronic system by virtue of the characteristics of high output power, wide working frequency band and the like.
The satellite communication at present has entered a high-throughput development stage, the functions to be realized by the satellite are more and more, with the increase of the data volume of the satellite communication and the continuous increase of the complexity of the system, the operation efficiency of the satellite load equipment is required to be improved, and the nonlinear distortion of the traveling wave tube power amplifier is required to be reduced as much as possible.
Linearization techniques have been developed to improve the amplifier linearity index, reduce distortion. The most common linearization techniques at present include: feedforward techniques, negative feedback techniques, predistortion techniques, and the like. The analog predistortion technology circuit has the advantages of simple structure, low cost, high working frequency range and easy integration, and is widely applied to engineering practice.
The analog predistorter applied at present has few adjustable parameters and poor circuit adjustability; the amplitude and phase distortion characteristics of the traditional reflection type predistortion circuit have strong relevance, any state of the circuit is changed, and the amplitude and phase characteristics are changed. When the power amplifier is actually matched, the predistortion circuit is difficult to ensure amplitude and phase compensation and simultaneously meets the linearization requirement of the target power amplifier, so that the linearization effect is poor and even the situation of deterioration occurs.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an analog predistortion structure which has simple structure, output signals with the predistortion characteristics of amplitude expansion and phase expansion and can improve the nonlinearity of TWTA and can be independently adjusted in amplitude and phase.
The aim of the invention is realized by the following technical scheme: an analog predistortion structure with independently adjustable amplitude and phase comprises a circulator, a Wilkinson power divider, a first nonlinear reflection branch consisting of a first blocking capacitor and a first Schottky barrier diode, and a second nonlinear reflection branch consisting of a second blocking capacitor and a second Schottky barrier diode;
the circulator is connected with the Wilkinson power divider through a first tuning transmission line; the Wilkinson power divider is respectively connected with the first nonlinear reflection branch circuit and the second nonlinear reflection branch circuit;
one end of the first blocking capacitor is connected with one signal port of the Wilkinson power divider through a second tuning transmission line, the other end of the first blocking capacitor is respectively connected with the anode of the first Schottky barrier diode and the first direct current bias circuit, and the cathode of the first Schottky barrier diode is grounded through a fourth tuning transmission line; one end of the second blocking capacitor is connected with the other signal port of the Wilkinson power divider through a third tuning transmission line, the other end of the second blocking capacitor is respectively connected with the anode of the second Schottky barrier diode and the second direct current bias circuit, and the cathode of the second Schottky barrier diode is grounded through a fifth tuning transmission line.
The first direct current bias circuit comprises a first radio frequency choke inductor and a first Schottky barrier diode bias resistor which are sequentially connected, and the other end of the first Schottky barrier diode bias resistor is connected with a first Schottky barrier diode direct current bias voltage;
the second direct current bias circuit comprises a second radio frequency choke inductance and a second Schottky barrier diode bias resistor which are sequentially connected, and the other end of the second Schottky barrier diode bias resistor is connected with a second Schottky barrier diode bias voltage.
The beneficial effects of the invention are as follows: the analog predistortion structure adopts a reflective structure composed of a circulator, a Wilkinson power divider, an actively biased Schottky barrier diode and a tuning transmission line, wherein the Schottky barrier diode is used as a nonlinear signal generating device, so that the circuit structure is simpler; the signal enters through the circulator and is equally divided into two paths by the Wilkinson power divider; the two branches adopt Schottky barrier diodes to generate nonlinear distorted reflected signals; the reflected signals of the two branches are subjected to vector synthesis by the Wilkinson power divider and output by a third port of the circulator, and the output signals have the predistortion characteristics of amplitude expansion and phase expansion, so that the nonlinearity of TWTA can be improved. On the basis, the relative independent adjustment of the amplitude and the phase compensation amount of the synthesized vector signal can be realized by adjusting the bias voltages of the two nonlinear branches, and the applicability and the flexibility of the structure are improved.
Drawings
FIG. 1 is a schematic diagram of an analog predistortion architecture of the present invention;
FIG. 2 is a schematic diagram of simulation results of an amplitude and phase compensation curve of an analog predistorter according to an embodiment of the present invention;
reference numerals illustrate: 1. a radio frequency signal input port; 2. a radio frequency signal output port; 3. a circulator; 4. a first tuned transmission line; 5. wilkinson power divider; 6. a second tuned transmission line; 7. a third tuned transmission line; 8. a first blocking capacitor; 9. a second blocking capacitor; 10. a first schottky barrier diode; 11. a second schottky barrier diode; 12. a fourth tuning transmission line; 13. a fifth tuning transmission line; 14. a first radio frequency choke inductance; 15. a second radio frequency choke inductance; 16. a first schottky barrier diode bias resistor; 17. a second schottky barrier diode bias resistor; 18. a first schottky barrier diode bias voltage; 19. the second schottky barrier diode biases the voltage.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, an analog predistortion structure with independently adjustable amplitude and phase for TWTA of the present invention comprises a circulator 3, a wilkinson power divider 5, a first nonlinear reflection branch composed of a first blocking capacitor 8 and a first schottky barrier diode 10, and a second nonlinear reflection branch composed of a second blocking capacitor 9 and a second schottky barrier diode 11;
the circulator 3 is connected with the wilkinson power divider 5 through a first tuning transmission line 4, transmits an input signal of the radio frequency signal input port 1 to the wilkinson power divider 5, and outputs a signal after reflection synthesis through the radio frequency signal output port 2, so that good isolation between the input signal and the output signal is ensured; the Wilkinson power divider 5 is respectively connected with the first nonlinear reflection branch circuit and the second nonlinear reflection branch circuit, and is mainly used for dividing an input signal into two paths and synthesizing the reflected signals;
one end of the first blocking capacitor 8 is connected with one signal port of the Wilkinson power divider 5 through the second tuning transmission line 6, the other end of the first blocking capacitor is respectively connected with the anode of the first Schottky barrier diode 10 and the first direct current bias circuit, and the cathode of the first Schottky barrier diode 10 is grounded through the fourth tuning transmission line 12; one end of the second blocking capacitor 9 is connected with the other signal port of the wilkinson power divider 5 through the third tuning transmission line 7, the other end of the second blocking capacitor 9 is respectively connected with the anode of the second schottky barrier diode 11 and the second direct current bias circuit, and the cathode of the second schottky barrier diode 11 is grounded through the fifth tuning transmission line 13.
The first direct current bias circuit comprises a first radio frequency choke inductance 14 and a first Schottky barrier diode bias resistor 16 which are sequentially connected, and the other end of the first Schottky barrier diode bias resistor 16 is connected with a first Schottky barrier diode direct current bias voltage 18;
the second direct current bias circuit comprises a second radio frequency choke inductance 15 and a second Schottky barrier diode bias resistor 17 which are sequentially connected, and the other end of the second Schottky barrier diode bias resistor 17 is connected with a second Schottky barrier diode bias voltage 19.
The radio frequency input signal of the radio frequency signal input port 1 is transmitted to a second port of the circulator 3 through the circulator, and the output signal of the second port is equally divided into two paths of equal-amplitude in-phase signals through the Wilkinson power divider 5; the equally divided signals are respectively loaded on a first Schottky barrier diode 10 through a first blocking capacitor 8 and on a second Schottky barrier diode 11 through a second blocking capacitor 9; changing the reflection coefficient of the corresponding branch by utilizing the nonlinear change of the input impedance of the Schottky barrier diode along with the input power; the two paths of reflected signals are synthesized by the power divider, and the final nonlinear signal is output by the third port of the circulator.
The impedance of the schottky barrier diode is related to the magnitude of the input power of the radio frequency signal and the dc bias condition. The first radio frequency choke inductance 14, the first Schottky barrier diode bias resistor 16 and the first Schottky barrier diode direct current bias voltage 18 form a first direct current bias circuit; the second radio frequency choke inductance 15, the second Schottky barrier diode bias resistor 17 and the second Schottky barrier diode bias voltage 19 form a second direct current bias circuit; the two dc bias circuits provide bias states for the first schottky barrier diode 10 and the first schottky barrier diode 11, respectively. The distortion characteristics of the nonlinear signal generated by the first schottky barrier diode 10 can be adjusted by adjusting the bias voltage V1 of the first dc bias circuit; the distortion characteristics of the nonlinear signal generated by the second schottky barrier diode 11 can be adjusted by adjusting the bias voltage V2 of the second dc bias circuit, and the last two signals are synthesized by the wilkinson power divider 5 to generate a curve capable of compensating for the nonlinear characteristics of the TWTA.
FIG. 2 is a schematic diagram of simulation results of the amplitude and phase compensation curve of the analog predistorter according to the present embodiment, wherein the abscissa Pin represents the input power in dBm; the ordinate Gain represents Gain in dB; the ordinate Phase represents Phase in degrees. Wherein, at 18.5GHz in the graph (a) and the graph (b), when v2=3.53V, the bias voltage V1 of the first dc bias circuit is tunable in amplitude curve and phase characteristic curve, and when the voltage V2 is a certain value, the voltage V1 can adjust the phase expansion of the predistorter, and the amplitude expansion changes little; as can be seen from the graph, when the voltage V1 is a certain value, the voltage V2 can adjust the amplitude expansion amount of the predistorter, and the phase expansion amount is very small, so that the independent adjustment of the amplitude and the phase is realized.
It can be seen that the amplitude and phase independently adjustable analog predistortion structure suitable for TWTA provided by the invention can realize the relatively independent change of the amplitude and phase compensation quantity of the predistorter by changing the circuit bias state. Compared with the existing reflection type circuit structure, the novel predistortion linearization structure can enable the adjustable parameters of the analog predistorter to be more; the two branches adopt a mode of independent power supply, so that the adjustability of the whole circuit is improved, the amplitude and the phase of the predistortion compensation curve can be independently adjusted, and the predistortion compensation circuit has the advantages of high adjustability, simple structure and the like.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (2)
1. An analog predistortion structure with independently adjustable amplitude and phase is characterized by comprising a circulator (3), a Wilkinson power divider (5), a first nonlinear reflection branch consisting of a first blocking capacitor (8) and a first Schottky barrier diode (10), and a second nonlinear reflection branch consisting of a second blocking capacitor (9) and a second Schottky barrier diode (11);
the circulator (3) is connected with a Wilkinson power divider (5) through a first tuning transmission line (4); the Wilkinson power divider (5) is respectively connected with the first nonlinear reflection branch circuit and the second nonlinear reflection branch circuit;
one end of the first blocking capacitor (8) is connected with one signal port of the Wilkinson power divider (5) through the second tuning transmission line (6), the other end of the first blocking capacitor is respectively connected with the anode of the first Schottky barrier diode (10) and the first direct current bias circuit, and the cathode of the first Schottky barrier diode (10) is grounded through the fourth tuning transmission line (12); one end of the second blocking capacitor (9) is connected with the other signal port of the Wilkinson power divider (5) through a third tuning transmission line (7), the other end of the second blocking capacitor (9) is respectively connected with the anode of the second Schottky barrier diode (11) and the second direct current bias circuit, and the cathode of the second Schottky barrier diode (11) is grounded through a fifth tuning transmission line (13).
2. An independently amplitude and phase adjustable analog predistortion architecture according to claim 1, wherein said first dc bias circuit comprises a first rf choke inductance (14) and a first schottky barrier diode bias resistance (16) connected in sequence, the other end of the first schottky barrier diode bias resistance (16) being connected to a first schottky barrier diode dc bias voltage (18);
the second direct current bias circuit comprises a second radio frequency choke inductance (15) and a second Schottky barrier diode bias resistor (17) which are sequentially connected, and the other end of the second Schottky barrier diode bias resistor (17) is connected with a second Schottky barrier diode bias voltage (19).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311501225.0A CN117439553A (en) | 2023-11-13 | 2023-11-13 | Analog predistortion structure with independently adjustable amplitude and phase |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311501225.0A CN117439553A (en) | 2023-11-13 | 2023-11-13 | Analog predistortion structure with independently adjustable amplitude and phase |
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| CN117439553A true CN117439553A (en) | 2024-01-23 |
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| CN202311501225.0A Pending CN117439553A (en) | 2023-11-13 | 2023-11-13 | Analog predistortion structure with independently adjustable amplitude and phase |
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- 2023-11-13 CN CN202311501225.0A patent/CN117439553A/en active Pending
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