CN114915303A - Ultra-wideband high-power radio frequency signal generating device - Google Patents

Ultra-wideband high-power radio frequency signal generating device Download PDF

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Publication number
CN114915303A
CN114915303A CN202210607147.1A CN202210607147A CN114915303A CN 114915303 A CN114915303 A CN 114915303A CN 202210607147 A CN202210607147 A CN 202210607147A CN 114915303 A CN114915303 A CN 114915303A
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unit
frequency
radio frequency
signal
power
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CN202210607147.1A
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杨洋
刘玲
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Yanxing Technology Shanghai Co ltd
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Yanxing Technology Shanghai Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/0433—Circuits with power amplifiers with linearisation using feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

The invention discloses an ultra-wideband high-power radio frequency signal generating device, which comprises a data acquisition and processing unit, a frequency source unit, a switch amplification and filtering unit, a directional coupling unit, a detection unit and a radio frequency signal output end, wherein the data acquisition and processing unit is used for acquiring a data signal; the data acquisition processing unit is configured to perform control signal distribution and data processing; the frequency source unit generates a basic signal source according to the control signal; the switch amplification filtering unit processes the basic signal source according to the control signal; the directional coupling unit couples the processed basic signal source and transmits the coupled basic signal source to the detection unit, the detection unit is connected with the data acquisition and processing unit to judge whether the processed basic signal source meets the standard or not, the radio frequency signal output end is controlled to output when the processed basic signal source meets the standard, and the control signal is updated when the processed basic signal source does not meet the standard, so that the frequency source unit and the switch amplification and filtering unit update the working state. The invention improves the precision of the signal power.

Description

Ultra-wideband high-power radio frequency signal generating device
Technical Field
The invention relates to the field of signal generators, in particular to an ultra-wideband high-power radio-frequency signal generating device.
Background
The broadband signal generator is generally widely used in the fields of civil communication, military communication, satellite communication, radar, electronic countermeasure, semiconductors, and the like as a general laboratory instrument. At present, the power of radio frequency/microwave signals generated by the products can only reach 30dBm at most, if a user wants to obtain higher power, the user can only realize the higher power through an external radio frequency power amplifier, but the external radio frequency power amplifier has certain defects because the harmonic distortion is serious and the power is uneven, so that a great error can be caused to the test.
Disclosure of Invention
The invention aims to provide an ultra-wideband high-power radio frequency signal generating device to improve the power and the frequency spectrum quality of signal generation and ensure the safe and stable operation of the signal generating device.
In order to solve the technical problem, the invention provides an ultra-wideband high-power radio-frequency signal generating device, which comprises a data acquisition and processing unit, a frequency source unit, a switch amplification and filtering unit, a directional coupling unit, a detection unit and a radio-frequency signal output end, wherein the data acquisition and processing unit is used for acquiring a radio-frequency signal;
the data acquisition processing unit is configured to perform control signal distribution and data processing;
the frequency source unit generates a basic signal source according to the control signal;
the switch amplification filtering unit processes the basic signal source according to the control signal;
the directional coupling unit couples the processed basic signal source and transmits the coupled basic signal source to the detection unit, the detection unit is connected with the data acquisition and processing unit to judge whether the processed basic signal source meets the standard or not, the radio-frequency signal output end is controlled to output when the processed basic signal source meets the standard, and the control signal is updated when the processed basic signal source does not meet the standard, so that the frequency source unit and the switch amplification and filtering unit update the working state.
Optionally, the frequency source unit generates a 9KHz-6GHz fundamental frequency signal by using a DDS technique, and then frequency-doubled to a maximum of 40GHz by using a frequency multiplier.
Optionally, the frequency source unit generates a basic frequency signal of 20MHz to 6GHz by using a PLL phase-locked frequency generation technology, and then the frequency is up to 40GHz by using a frequency multiplier.
Optionally, the switch amplifying and filtering unit includes two sets of radio frequency switches, the two sets of radio frequency switches are respectively connected to the frequency source unit and the directional coupling unit, and a multi-path amplifying filter is connected between the two sets of radio frequency switches.
Optionally, each group of the radio frequency switches includes at least one switch.
Optionally, a heat dissipation unit is disposed on the amplification filter.
Optionally, the detecting unit includes a forward power detecting unit and the reverse power detecting unit.
Optionally, when the reflected power detected by the reverse power detection unit exceeds a limit value, the power supply is disconnected to forcibly turn off the device.
Optionally, a human-computer interaction interface is arranged on the data acquisition and processing unit.
Compared with the prior art, the invention at least has the following beneficial effects:
the invention adopts a closed-loop control mode to collect and feed back the output signal to the data acquisition processing unit and adjust the signal power until the generated signal conforms to the set parameters, thereby effectively improving the quality of the signal generation.
Furthermore, real-time feedback of the transmitting power is adopted, so that the signal generating device can be effectively prevented from being burnt due to overlarge transmitting power, and a good protection mechanism is provided.
Drawings
FIG. 1 is a schematic diagram of an overall structure of an embodiment of an ultra-wideband high-power RF signal generating device according to the present invention;
FIG. 2 is a circuit diagram of a data acquisition processing unit of an embodiment of the ultra-wideband high-power RF signal generating device of the present invention;
FIG. 3 is a block diagram of a frequency source unit of an embodiment of the ultra-wideband high-power RF signal generating apparatus according to the present invention;
fig. 4 is a block diagram of a frequency source unit of another embodiment of the ultra-wideband high-power rf signal generating device according to the present invention;
fig. 5 is a circuit diagram of a frequency source unit of another embodiment of the ultra-wideband high-power rf signal generating device of the present invention;
FIG. 6 is a circuit diagram of an amplifying filter of an embodiment of the ultra-wideband high-power RF signal generating device according to the present invention;
FIG. 7 is a circuit diagram of a selection switch of an embodiment of the ultra-wideband high-power RF signal generating device according to the present invention;
fig. 8 is a circuit diagram of a forward and reverse power detection unit of an embodiment of the ultra-wideband high-power rf signal generation apparatus of the present invention.
Detailed Description
The ultra-wideband high power radio frequency signal generating apparatus of the present invention will now be described in more detail with reference to the schematic drawings, in which preferred embodiments of the invention are shown, it being understood that one skilled in the art may modify the invention herein described while still achieving the advantageous effects of the invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is provided for the purpose of facilitating and clearly illustrating embodiments of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an ultra-wideband high-power radio frequency signal generating device, which includes a data acquisition processing unit, a frequency source unit, a switch amplification filtering unit, a directional coupling unit, a detecting unit, and a radio frequency signal output end;
the data acquisition processing unit is configured to perform control signal distribution and data processing;
the frequency source unit generates a basic signal source according to the control signal;
the switch amplification filtering unit processes the basic signal source according to the control signal;
the directional coupling unit couples the processed basic signal source and transmits the coupled basic signal source to the detection unit, the detection unit is connected with the data acquisition and processing unit to judge whether the processed basic signal source meets the standard or not, the radio-frequency signal output end is controlled to output when the processed basic signal source meets the standard, and the control signal is updated when the processed basic signal source does not meet the standard, so that the frequency source unit and the switch amplification and filtering unit update the working state.
As an example, the data acquisition processing unit is connected to the frequency source unit and the switch amplification filtering unit, and outputs control signals to the frequency source unit and the switch amplification filtering unit, respectively.
As an example, the frequency source unit is connected to the switching amplification and filtering unit, the frequency source unit generates a basic signal source according to the control signal of the data acquisition and processing unit, and the basic signal source is transmitted to the switching amplification and filtering unit and amplifies and filters the signal source of the frequency source according to the instruction of the data acquisition and processing unit.
As an example, the directional coupling unit is connected between the switch amplification filtering unit and the detection unit, the detection unit is connected to the data acquisition processing unit, the directional coupling unit receives an output signal of the switch amplification filtering unit and obtains a measured power value, the detection unit converts the measured power value into a voltage value and transmits the voltage value to the data acquisition processing unit, and the data acquisition processing unit compares the voltage value with a preset value and updates a control signal according to a result of the comparison; for example, when the voltage value matches the preset value, the processed signal source is determined to have reached the requirement, and output can be performed; for example, when the voltage value does not match the preset value, the data acquisition processing unit updates a control signal according to the comparison result, for example, adjusts the output power level of the frequency source unit, and/or adjusts the amplification and filtering forms of the switch amplification filtering unit. And circulating for many times until the voltage value is matched with the preset value. The closed-loop control mode in the invention can ensure that the power precision reaches the range of +/-0.3 dB.
As an example, the radio frequency signal output terminal is connected to the directional coupling unit and performs power output.
In the invention, signal parameters can be input through the data acquisition and processing unit, the signal parameters are set and then are sent to the frequency source unit, the frequency source unit sends out a basic signal source, then the basic signal source enters the switch amplification and filtering unit for signal amplification and filtering, and finally, the directional coupling unit is used for signal coupling and output.
In one embodiment, a human-computer interaction interface is arranged on the data acquisition and processing unit. Specifically, the human-computer interaction interface can be realized by touching the display screen, so that on one hand, parameters of the output signal can be visually observed, and meanwhile, the parameter setting of the signal generating device is also convenient.
The data acquisition and processing unit acquires instructions through a human-computer interaction interface, so that the frequency source unit is controlled to generate frequency, and the switch amplification and filtering unit is controlled to work.
Furthermore, the voltage condition given by the power detection circuit can be calculated, and closed-loop power control and reflection protection can be performed.
In addition, the device is also responsible for command communication between the communication interface and the outside, power management of the power interface and the like, and is an operation and processing center of the device.
Fig. 2 illustrates a specific circuit of the data acquisition processing unit in an embodiment of the present invention, which is constructed mainly by a single chip microcomputer of model STM32F407ZET 6.
In an embodiment of the present invention, a frequency source unit is provided, and specifically, as shown in fig. 3, the frequency source unit includes an FPGA microcontroller, one end of the FPGA microcontroller is connected to a frequency multiplier, the other end of the FPGA microcontroller is connected to a direct digital synthesizer, a first single-pole double-throw switch is disposed between an output end of the direct digital synthesizer and a first output end of the frequency multiplier, and a second single-pole double-branch switch is disposed between a second output end of the frequency multiplier and the first single-pole double-throw switch. The P end of the first single-pole double-throw switch is connected with the output end of the direct digital synthesizer, the T1 end of the first single-pole double-throw switch is connected with the first output end of the frequency multiplier, the T2 end of the first single-pole double-throw switch is connected with the T2 end of the second single-pole double-throw switch, the T1 end of the second single-pole double-throw switch is connected with the second output end of the frequency multiplier, and the P end of the second single-pole double-throw switch is connected with the radio frequency output end.
In this embodiment, a DDS (direct digital frequency synthesis) is used to generate a 9KHz-6GHz fundamental frequency signal, and then a frequency multiplier is used to multiply the frequency to a maximum of 40GHz, so as to obtain a desired fundamental signal.
In one example, direct digital frequency synthesis may be implemented based on an AD9177 chip.
In another embodiment of the present invention, a frequency source unit is provided, and specifically, referring to fig. 4, the present embodiment is mainly implemented by using a PLL phase-locked frequency generator.
In this embodiment, a PLL phase-locked frequency generation technique is used to generate a fundamental frequency signal of 20MHz to 6GHz, and then a frequency multiplier is used to make the frequency reach 40GHz at most, so as to obtain a desired fundamental signal.
In one example, the phase-locked frequency generation may be implemented based on an HMC833 chip, as one possible circuit design is shown in fig. 5.
The switch amplification filtering unit comprises two groups of radio frequency switches, the two groups of radio frequency switches are respectively connected with the frequency source unit and the directional coupling unit, and a multipath amplification filter is connected between the two groups of radio frequency switches. Each set of the radio frequency switches comprises at least one switch.
Specifically, the frequency source unit generates signals of specified frequency and power after receiving the instruction of the data acquisition processing unit, the signals enter the switch amplification filtering unit and turn on the amplifier of corresponding frequency according to the instruction, and then enter the multi-path amplification filter and turn on the filter of corresponding frequency according to the instruction, so as to obtain radio frequency/microwave signals of high power and low harmonic component; the amplifiers with different power levels can be selected to reach different power levels, the power levels have no upper limit, but the larger the power is, the larger the amplifier is; limited by the size of the bench-top instrument, typically up to 60 dBm.
Specifically, the signal generated by the frequency source unit is usually very weak, about 0 dBm; in the device of the invention, signals up to 50dBm can be output, so that the signals generated by the frequency source module need to be amplified, and therefore, an amplifier is added. The amplifier belongs to a nonlinear device, and generates harmonic waves (integral multiple of fundamental wave frequency, for example, second harmonic is twice of fundamental wave frequency, third harmonic is three times of fundamental wave frequency, and the like) to an input signal, and the harmonic waves are also amplified by the amplifier within the bandwidth of the amplifier to form a large harmonic component. Therefore, in order to make the output signal of the amplifier become pure, the amplifier needs to be segmented, so that the harmonic signals of the second order and the second order are out of the bandwidth of the amplifier, and a filter is added at the tail end to thoroughly filter out the higher harmonics. We achieve this goal with a switched amplification filter bank scheme.
Generally, for an ultra-wideband signal of 9KHz to 40GHz, in a low-frequency 9KHz to 100MHz part, because the octave is very long, a plurality of sections of signals are required to be divided to completely filter out harmonic waves, and in practical application, the design of segmented amplification and filtering of a frequency signal of 9KHz to 100MHz cannot be completed by considering space and technical factors, so that the harmonic waves of the frequency signal can be reduced by considering a scheme of power back of a 9KHz to 100MHz amplifier. The device of the invention uses an amplifier with the output of 9KHz-100MHz as high as 56dBm, and when the amplifier is used at 50dBm (namely 6dB back), the harmonic component can reach about-40 dBc, thereby meeting the design requirement.
As an example, in the section of 100MHz-40GHz, we divide the section of 100-150MHz, 150-250MHz, 250-400MHz, 400-700MHz, 700-1100MHz, 1.1-2GHz, 2-3.5GHz, 3.5-6GHz, 6-10GHz, 10-18GHz, 18-26.5GHz, 26.5-40GHz into 12 sections of amplification filters, and add the section of 9KHz-100MHz to make a total of 13 paths of amplification filter combinations.
In order to combine 13 paths of amplification filter banks, two single-pole 13-throw high-power radio frequency switches are respectively arranged in front of and behind the amplification filter bank to form a switch amplification filter bank capable of gating any channel.
And finally, the data acquisition and processing unit selects the corresponding segment through the radio frequency switch according to the frequency set by the current signal source module. The purpose of generating pure high-power radio frequency signals is achieved.
Referring to fig. 6 and fig. 7, a possible circuit design of the amplifying filter and the selection switch in the embodiment of the present invention is illustrated.
And the amplifying filter is provided with a heat dissipation unit.
Specifically, the heat dissipation unit may be a heat dissipation fan, but is not limited to a heat dissipation fan. The arrangement of the heat dissipation unit can quickly dissipate heat of the amplification filter, and the amplification filter is guaranteed to work within a normal temperature range.
In the present invention, a feedback mechanism is introduced, please refer to fig. 1 continuously, a forward power detection unit is disposed between the directional coupling unit and the data acquisition and processing unit, and performs sampling and feedback to the data acquisition and processing unit, if the generated signal does not meet the set parameter standard, the data acquisition and processing unit adjusts the control command, and the switch amplification and filtering unit further processes the basic signal source until the signal output by the directional coupling unit meets the set parameter standard.
When the rf signal output terminal is connected to the load, there may be a problem of impedance mismatch due to non-linear factors in the rf network, and when the load at the output terminal is not matched to the impedance of the apparatus of the present invention, the rf power is reflected.
Therefore, in one embodiment of the invention, a reverse power detection unit is arranged between the directional coupling unit and the data acquisition and processing unit, and when the reflected power detected by the reverse power detection unit exceeds a limit value, a power supply is cut off to forcibly turn off the device, so that the purpose of protection is achieved, the device is prevented from being burnt due to high-power reflection, and the reliability is improved.
In the embodiment of the invention, the principle of the detection unit is to convert the high-frequency signal separated by the coupling unit into voltage values, and different output powers correspond to different voltage values, so that a group of voltage value tables corresponding to standard power can be obtained in a pre-calibration mode, and when the device works, the corresponding output power is accurately calculated according to the detected voltage values.
Referring to fig. 8, a possible circuit design for forward and reverse power detection in an embodiment of the invention is shown.
The radio frequency signal generating device further comprises a power supply interface and a communication interface, wherein the power supply interface and the communication interface are respectively used for power supply and data communication. The power supply interface and the communication interface are arranged, so that power supply and data communication with external devices are facilitated for the signal generating device, and data transmission is facilitated.
In summary, the invention adopts a closed-loop control mode to collect and feed back the output signal to the data collecting and processing unit and adjust the signal power until the generated signal conforms to the set parameter, thereby effectively improving the precision of the signal power, and meanwhile, the invention adopts real-time monitoring and threshold setting of the reflected power, thereby effectively avoiding the burning of the signal generating device caused by overlarge reflected power, and having a good protection mechanism.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. An ultra-wideband high-power radio frequency signal generating device is characterized by comprising a data acquisition and processing unit, a frequency source unit, a switch amplification and filtering unit, a directional coupling unit, a detection unit and a radio frequency signal output end;
the data acquisition processing unit is configured to perform control signal distribution and data processing;
the frequency source unit generates a basic signal source according to the control signal;
the switch amplification filtering unit processes the basic signal source according to the control signal;
the directional coupling unit couples the processed basic signal source and transmits the coupled basic signal source to the detection unit, the detection unit is connected with the data acquisition and processing unit to judge whether the processed basic signal source meets the standard or not, the radio-frequency signal output end is controlled to output when the processed basic signal source meets the standard, and the control signal is updated when the processed basic signal source does not meet the standard, so that the frequency source unit and the switch amplification and filtering unit update the working state.
2. The ultra-wideband high-power radio frequency signal generating device according to claim 1, wherein the frequency source unit generates a basic frequency signal of 9KHz-6GHz by using DDS technology, and then frequency-doubled to a maximum of 40GHz by a frequency multiplier.
3. The ultra-wideband high-power radio frequency signal generating device according to claim 1, wherein the frequency source unit generates a fundamental frequency signal of 20MHz-6GHz by using PLL phase-locked frequency generating technology, and then the frequency is increased to 40GHz by a frequency multiplier.
4. The ultra-wideband high-power radio frequency signal generating device according to claim 1, wherein the switch amplifying and filtering unit comprises two sets of radio frequency switches, the two sets of radio frequency switches are respectively connected with the frequency source unit and the directional coupling unit, and a multi-path amplifying filter is connected between the two sets of radio frequency switches.
5. The ultra-wideband high power radio frequency signal generating device according to claim 4, wherein each set of said radio frequency switches comprises at least one switch.
6. The ultra-wideband high-power radio frequency signal generating device according to claim 4, wherein a heat dissipating unit is disposed on the amplifying filter.
7. The ultra-wideband high power radio frequency signal generating device of claim 1, wherein said detecting element comprises a forward power detecting element and said reverse power detecting element.
8. The apparatus according to claim 7, wherein the power supply is turned off to turn off the apparatus when the reflected power detected by the reverse power detecting unit exceeds a threshold.
9. The ultra-wideband high-power radio frequency signal generating device according to claim 1, wherein a human-computer interaction interface is disposed on the data acquisition processing unit.
CN202210607147.1A 2022-05-31 2022-05-31 Ultra-wideband high-power radio frequency signal generating device Pending CN114915303A (en)

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Application Number Priority Date Filing Date Title
CN202210607147.1A CN114915303A (en) 2022-05-31 2022-05-31 Ultra-wideband high-power radio frequency signal generating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210607147.1A CN114915303A (en) 2022-05-31 2022-05-31 Ultra-wideband high-power radio frequency signal generating device

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CN114915303A true CN114915303A (en) 2022-08-16

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