CN210954325U - High-frequency broadband signal source - Google Patents
High-frequency broadband signal source Download PDFInfo
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- CN210954325U CN210954325U CN201921424448.0U CN201921424448U CN210954325U CN 210954325 U CN210954325 U CN 210954325U CN 201921424448 U CN201921424448 U CN 201921424448U CN 210954325 U CN210954325 U CN 210954325U
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Abstract
The utility model relates to a high frequency broadband signal source, including the reference cell, the output of reference cell even has the input of phase-locked source, the output of phase-locked source even has the input of mixing amplification unit, phase-locked source and mixing amplification unit all link to each other with the control unit. The utility model discloses can overcome the not enough problem of signal source in radar test system of other signal sources to a certain extent.
Description
Technical Field
The utility model relates to a radar test field particularly, relates to a high frequency broadband signal source.
Background
In the field of radar testing, a radio frequency signal source plays a decisive role. A radar is a device that detects a target and measures target information by transmitting and receiving electromagnetic waves. The signals transmitted and received in the radar are provided by a signal source. The signal source may be transmitted by a transmitting radar and then received by the radar. In this process, the frequency sweeping function of the radar emission frequency is the most important, and the information such as height, distance, speed and even motion direction can be extracted through the information such as phase difference, frequency difference or amplitude change of the transmitted and received signals by the radar frequency sweeping.
The application of the above signal sources in a radar test system puts various requirements on the signal sources. The signal source used in the radar test system has a certain frequency range, a certain power output (and frequency stepping is not too large) and a certain power dynamic range.
An effective solution to the problems in the related art has not been proposed yet.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned technical problem among the correlation technique, the utility model provides a high frequency broadband signal source can overcome the not enough problem of signal source in radar test system of other signal sources to a certain extent.
In order to achieve the technical purpose, the technical scheme of the utility model is realized as follows:
the output end of the reference unit is connected with the input end of a phase-locked source, the output end of the phase-locked source is connected with the input end of a frequency-mixing amplification unit, and the phase-locked source and the frequency-mixing amplification unit are both connected with a control unit.
Furthermore, the phase-locked source comprises a first phase-locked source and a second phase-locked source, the frequency mixing amplifying unit comprises a mixer, a filter, a first attenuator, an amplifier and a second attenuator, the output end of the reference unit is respectively connected with the input ends of the first phase-locked source and the second phase-locked source, the output ends of the first phase-locked source and the second phase-locked source are respectively connected with the intermediate frequency IF end and the local oscillator LO end of the mixer, the radio frequency RF end of the mixer is connected with the input end of the filter, the output end of the filter is connected with the input end of the first attenuator, the output end of the first attenuator is connected with the input end of the amplifier, the output end of the amplifier is connected with the input end of.
Furthermore, the output frequencies of the phase-locked source I and the phase-locked source II are different, and the frequency range of the frequency mixing output by the frequency mixer is in the range of 15GHz to 36 GHz.
Furthermore, the control unit controls the frequency of the phase-locked source I and the phase-locked source II to realize the step change of the output frequency at the output end with the minimum 1 KHz.
Further, the control unit controls the attenuator I to keep the flatness of the output power within 1 dB.
Further, the amplifier adopts a two-stage amplifier and has a gain exceeding 40 dB.
Furthermore, the control unit controls the second attenuator to enable the output power to be adjustable within the range of-31 dBm to 0dBm, wherein the minimum attenuation is 0.5dB, and the attenuation error is not more than +/-0.2 dB.
Further, the control unit realizes pulse modulation output through the control of the amplifier.
The utility model has the advantages that: the utility model mainly uses the single chip microcomputer to configure the internal register data of the phase discriminator, the phase discriminator after the configuration can complete the phase frequency discrimination and phase discrimination functions of the designated frequency, and the phase source with a certain frequency band is controlled by utilizing the special function of the phase discriminator, so that the phase source outputs the designated radio frequency signal in the frequency band; then, the two output appointed radio frequency signals are subjected to frequency mixing and filtering to obtain a radio frequency signal with the step of 1KHz and the output frequency of 15GHz to 36 GHz. Because the frequency of the signal source is wide, the consistency of the output power can not be ensured after the signal is amplified and filtered, so that the analog attenuator and the numerical control attenuator are added on the output channel to balance the output power and adjust the flatness of the output signal. The design not only improves the consistency of the output signal source power, but also ensures that the output power is adjustable within the range of 31 dB.
The utility model discloses it is high mainly to have output frequency stability, and the output uniformity is good, and the output is stray low, and the harmonic restraines high, and the frequency is step-by-step characteristics such as little.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of a high-frequency broadband signal source according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
As shown in FIG. 1, according to the embodiment of the present invention, a high frequency broadband signal source is a 35G signal source, including reference unit, phase-locked source, amplifying and mixing part and control unit, the output of reference unit is connected with the input of phase-locked source, the output of phase-locked source is connected with the input of amplifying and mixing part, and the control unit is connected with phase-locked source and amplifying and mixing part for control.
In a preferred embodiment, the phase-locked source is divided into a first phase-locked source and a second phase-locked source, wherein one phase-locked source is a low-frequency output and the other phase-locked source is a high-frequency output. The reference part of the low-frequency output phase-locked source is from the output of the reference source part, the control pin of the phase-locked source is connected with the pin of the control part, and the output end of the phase-locked source is connected with the intermediate frequency IF end of the mixer. The reference part of the high-frequency output phase-locked source is connected with the output end of the reference source part, the control pin of the phase-locked source is connected with the control pin of the control part, and the output is connected with the local oscillator LO end of the frequency mixer. Output filters are arranged at the output ends of the phase-locked sources to filter output signals of the phase-locked sources, so that the frequency spectrum of the output signals is guaranteed, spurious suppression is more than 60dB, and input of a mixer is guaranteed.
In a preferred embodiment, the mixer uses an intermediate frequency IF, the input frequency being up to 10G or more. The insertion loss of the mixer cannot be too large, and the insertion loss is required to be not more than 10dB and not less than 30dB for the intermediate frequency and the local oscillator isolation.
In a preferred embodiment, the filter mainly filters out the spurious signals at the out-of-band near end, and the insertion loss is about 1 dB.
In a preferred embodiment, the primary function of the first attenuator is to adjust the dynamic range of the output, and since the signal is output from the phase-locked source, mixed, amplified, filtered and attenuated, the output flatness of the whole device is too poor due to the device itself or external factors, and may exceed 10dB at most. After the attenuation of the attenuator I, the output flatness can reach within 1dB through monitoring the output.
In a preferred embodiment, the amplifier frequency reaches 36GHz, the bandwidth exceeds 2GHz, the gain is not lower than 20dB, the two-stage amplifier is amplified in a cascade mode, the total gain is not lower than 40dB, and the flatness in a cut amplifier bag is not higher than 3 dB.
In a preferred embodiment, the second attenuator has an attenuation range of 31dB, a frequency of 36GHz and a bandwidth exceeding 2 GHz. And the second attenuator is mainly used for controlling the gain control of the whole machine, ensuring that the output power is adjustable, realizing the amplitude debugging of output signals and increasing the functions of the whole machine.
In a preferred embodiment, the amplifier can realize output pulse waveform control when performing power supply control, the duty cycle time is 100ns at minimum, the pulse period can reach 0.5us at minimum, and the output power is not more than-60 dBm when the output is turned off. The design increases the output mode, provides certain convenience for the test and debugging of the later stage and greatly provides the service performance of the equipment.
For the convenience of understanding the above technical solutions of the present invention, the above technical solutions of the present invention are explained in detail below through the working principle and the specific using mode.
The working principle is as follows: first, two phase locked source sections will be described. The phase-locked source compares the phase discriminator with the reference unit, so that the stability of the output frequency is higher. The two phase-locked sources respectively output two different frequencies, one phase-locked source has a higher frequency, and the other phase-locked source has a lower output.
The 35G signal source controls the frequencies of the two phase-locked sources through the control unit, uses a signal source with higher frequency as a local oscillation signal source, and realizes stepping 1MHz change in frequency change; a signal source with lower frequency is used as a signal source of intermediate frequency, and the frequency change of 1KHz stepping is realized for small stepping change. In the process, the control mode of the frequency source design is very simple and convenient in frequency control, and not only can the change of large step frequency modulation be met, but also the very small step change can be met.
Second, the two phase locked sources are mixed by a mixer. During the frequency mixing process, the two phase-locked sources obtain a mixing signal with higher frequency through up-conversion. During the up-conversion process, a plurality of harmonics and clutter appear at the output end of the mixer. In order to meet the requirements of harmonic and clutter suppression of the output, a filter is added to the output end of the mixer to filter the output signal of the mixer. The filtered and output signal is subjected to gain control through an attenuator to make up for the flatness difference of the mixer, and the attenuator is subjected to attenuation control through a control unit.
Finally, the signal attenuated by the attenuator is amplified by an amplifier to provide sufficient power output. The harmonic gain of the selected amplifier is not too high, and the amplification gain is ensured to output power. The output end of the amplifier is connected with an attenuator for gain control, the attenuator at the output end is controlled by a control unit, the attenuation step is 0.5dB, and the maximum attenuation is 31 dB.
The output pulse modulation function can be realized by controlling the power supply of the amplifier, and when the pulse modulation function is required to be turned off, a detection signal at the output end does not exceed-60 dBm.
In specific use, after the reference unit outputs a reference signal, the reference signal is provided to two phase-locked sources as reference inputs, and after the phase-locked sources are compared with an input reference frequency, the output signal is locked. The frequencies output by the two signal sources are respectively accessed to an intermediate frequency port and a local oscillator interface of the frequency mixer, and the output frequency is extracted at a radio frequency interface of the frequency mixer; the output frequency is filtered by the filter and is output to the amplifier for amplification, and pulse modulation of an output signal can be realized by controlling the power supply of the amplifier; then the output of the amplifier is sent to the attenuator for gain control and then output.
To sum up, the utility model discloses an use special phase-locked source circuit of design, mixing circuit and attenuator decay circuit, reached stray low, output gain is adjustable, output frequency adjusts characteristics such as step-by-step little. The output gain control, the output frequency control, the output switching and other functions are mainly provided. All the above designs increase the controllability of the output signal.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The high-frequency broadband signal source comprises a reference unit and is characterized in that the output end of the reference unit is connected with the input end of a phase-locked source, the output end of the phase-locked source is connected with the input end of a frequency-mixing amplification unit, and the phase-locked source and the frequency-mixing amplification unit are both connected with a control unit.
2. The high-frequency broadband signal source according to claim 1, wherein the phase-locked source comprises a first phase-locked source and a second phase-locked source, the mixing amplifying unit comprises a mixer, a filter, a first attenuator, an amplifier, and a second attenuator, an output terminal of the reference unit is respectively connected to input terminals of the first phase-locked source and the second phase-locked source, output terminals of the first phase-locked source and the second phase-locked source are respectively connected to an intermediate frequency IF terminal and a local oscillator LO terminal of the mixer, a radio frequency RF terminal of the mixer is connected to an input terminal of the filter, an output terminal of the filter is connected to an input terminal of the first attenuator, an output terminal of the first attenuator is connected to an input terminal of the amplifier, an output terminal of the amplifier is connected to an input terminal of the second.
3. The high-frequency broadband signal source according to claim 2, wherein the output frequencies of the phase-locked source I and the phase-locked source II are different, and the frequency range of the frequency mixing output by the frequency mixer is 15GHz to 36 GHz.
4. The high-frequency broadband signal source according to claim 3, wherein the control unit performs frequency control on the phase-locked source I and the phase-locked source II to realize step change of the output frequency at the output end by at least 1 KHz.
5. The high frequency broadband signal source of claim 4, wherein the control unit controls the attenuator to keep the output power within 1dB of flatness.
6. The high frequency broadband signal source of claim 5 wherein the amplifier is a two stage amplifier and has a gain in excess of 40 dB.
7. The high-frequency broadband signal source according to claim 6, wherein the control unit controls the second attenuator to make the output power adjustable within a range of-31 dBm to 0dBm, wherein the minimum attenuation is 0.5dB, and the attenuation error is not more than +/-0.2 dB.
8. The high frequency broadband signal source of claim 7, wherein the control unit implements a pulse modulated output by controlling the amplifier.
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| CN201921424448.0U CN210954325U (en) | 2019-08-30 | 2019-08-30 | High-frequency broadband signal source |
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| CN201921424448.0U CN210954325U (en) | 2019-08-30 | 2019-08-30 | High-frequency broadband signal source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113411143A (en) * | 2021-06-28 | 2021-09-17 | 上海创远仪器技术股份有限公司 | Power fitting processing method, system, device, processor and storage medium for eliminating uncertainty of numerical control attenuator in signal source |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113411143A (en) * | 2021-06-28 | 2021-09-17 | 上海创远仪器技术股份有限公司 | Power fitting processing method, system, device, processor and storage medium for eliminating uncertainty of numerical control attenuator in signal source |
| CN113411143B (en) * | 2021-06-28 | 2023-02-17 | 上海创远仪器技术股份有限公司 | Power fitting processing method, system, device, processor and storage medium for eliminating uncertainty of numerical control attenuator in signal source |
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