CN117792291A - Broadband frequency converter - Google Patents
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- CN117792291A CN117792291A CN202311849167.0A CN202311849167A CN117792291A CN 117792291 A CN117792291 A CN 117792291A CN 202311849167 A CN202311849167 A CN 202311849167A CN 117792291 A CN117792291 A CN 117792291A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 46
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000011218 segmentation Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 description 5
- 230000001629 suppression Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Abstract
The invention discloses a broadband frequency converter, which relates to the technical field of signal processing equipment and comprises a pre-amplifying circuit, a first frequency conversion circuit and a second frequency conversion circuit, wherein the output end of the pre-amplifying circuit is connected with the input end of the first frequency conversion circuit; the first branch, the second branch and the third branch are arranged in parallel, the main circuit is respectively connected with the first branch, the second branch and the third branch in series, and the first branch, the second branch and the third branch are all provided with pre-pass filters; the main path is provided with two first third switches, one of the first third switches is close to the input end of the pre-pass filter, and the other third switch is close to the output end of the pre-pass filter. The invention avoids the stray caused by combined interference and effectively ensures the index of the final output stray.
Description
Technical Field
The invention relates to the technical field of signal processing equipment, in particular to a broadband frequency converter.
Background
Wideband tracking transducers are link devices in a scout receiving system that can convert signals in one frequency range to another. However, the broadband tracking frequency converter has some problems. First, maintaining high linearity over a wide frequency band is challenging, which can affect signal quality; secondly, it is susceptible to other surrounding frequency signals; in addition, more complex filters may be required at the input or output of the wideband frequency converter to ensure that only the desired signal band is converted while suppressing unwanted signals.
Therefore, a wideband frequency converter is needed to solve the problems of combined interference, image frequency, local oscillation leakage, suppression of related and non-related clutter signals such as second harmonic and the like generated by the wideband frequency converter in the frequency mixing process.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a broadband frequency converter which completely ensures stray caused by combined interference, and ensures that the clutter suppression degree is less than or equal to-50 dB, thereby improving the output quality of main signals.
In order to achieve the above object, the present invention provides the following technical solutions:
a wideband frequency converter, comprising:
the output end of the pre-amplifying circuit is connected with the input end of the first frequency conversion circuit, and the output end of the first frequency conversion circuit is connected with the input end of the second frequency conversion circuit; the output end of the second frequency conversion circuit is connected with the input end of the output circuit;
the first frequency conversion circuit and the second frequency conversion circuit are used for carrying out segmentation frequency division processing on an input signal and outputting the input signal.
Further, the first frequency conversion circuit comprises a first main circuit, a first branch circuit, a second branch circuit and a third branch circuit;
the first branch, the second branch and the third branch are arranged in parallel, the main circuit is respectively connected with the first branch, the second branch and the third branch in series, and the first branch, the second branch and the third branch are all provided with pre-pass filters;
the first main path is provided with two first three-way switches, one first three-way switch is close to the input end of the pre-pass filter, and the other three-way switch is close to the output end of the pre-pass filter.
Further, the second frequency conversion circuit comprises a second main circuit, a third branch circuit, a fourth branch circuit and a fifth branch circuit;
the third branch, the fourth branch and the fifth branch are arranged in parallel, the second main path is connected with the third branch, the fourth branch and the fifth branch in series, and the third branch, the fourth branch and the fifth branch are respectively provided with an amplifier, a broadband mixer, a broadband amplifier, a band-pass filter, a broadband mixer, a broadband amplifier and a band-pass filter in sequence;
two second third switches are arranged on the second main circuit, one second third switch is close to the output end of the second frequency conversion circuit, and the other second third switch is close to the input end of the second frequency conversion circuit.
Further, the pre-amplification circuit comprises a limiter, a coupler, a 6-bit digital attenuator, a wide-frequency-band amplifier and a wide-frequency-band amplifier, wherein the limiter, the coupler, the 6-bit digital attenuator, the wide-frequency-band amplifier and the wide-frequency-band amplifier are sequentially connected in series, and the wide-frequency-band amplifier is connected with the input end of the first trisection switch.
Further, the digital attenuator further comprises a comparator, a detector and an amplifier, wherein the comparator, the detector and the amplifier are sequentially connected in series, the input end of the comparator is connected with the output end of the digital attenuation end, and the output end of the amplifier is connected with the input end of the coupler.
Further, the output circuit comprises a low-pass filter, an intermediate frequency amplifier, a 6-bit digital attenuator, an intermediate frequency amplifier, a low-pass filter and a band-pass filter which are sequentially connected in series with the output end of the second frequency conversion circuit.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the first frequency conversion circuit and the second frequency conversion circuit perform segmentation frequency division processing on input signals and output the signals and the double mixers in the branches are arranged to avoid spurious caused by combined interference, so that indexes of final output spurious are effectively ensured.
Drawings
FIG. 1 is a schematic illustration of the main process of the present invention;
FIG. 2 is a schematic flow diagram of a pre-amplifier circuit according to the present invention;
FIG. 3 is a schematic flow chart of the output circuit of the present invention;
FIG. 4 is a graph of a wideband amplifier of the present invention;
FIG. 5 is a graph of a 2-6 GHz mixed to 8.5GHz broadband mixer in accordance with the invention;
FIG. 6 is a graph of a 5.85-12.75 GHz mixed to 2.15GHz broadband mixer in accordance with the invention;
FIG. 7 is a graph of a 2.15GHz amplifier in accordance with the present invention;
fig. 8 and 9 are graphs of the 12.7-21.2 GHz to 3.6GHz broadband mixer of the present invention.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
In this embodiment, as shown in fig. 1, a wideband frequency converter is provided, which includes:
the output end of the pre-amplifying circuit is connected with the input end of the first frequency conversion circuit, and the output end of the first frequency conversion circuit is connected with the input end of the second frequency conversion circuit; the output end of the second frequency conversion circuit is connected with the input end of the output circuit;
the first frequency conversion circuit and the second frequency conversion circuit are used for carrying out segmentation frequency division processing on an input signal and outputting the input signal.
The first frequency conversion circuit and the second frequency conversion circuit perform segmentation frequency division processing on input signals and output the signals and the double mixers in the branches are arranged to avoid spurious caused by combined interference, so that indexes of final output spurious are effectively ensured.
Further optimizing the above embodiment, the first frequency conversion circuit includes a first main circuit, a first branch circuit, a second branch circuit, and a third branch circuit;
the first branch, the second branch and the third branch are arranged in parallel, the first main path is respectively connected with the first branch, the second branch and the third branch in series, and the first branch, the second branch and the third branch are all provided with pre-pass filters;
the first main path is provided with two first third switches, one of which is close to the input end of the pre-pass filter, and the other of which is close to the output end of the pre-pass filter.
Further optimizing the above embodiment, the second frequency conversion circuit includes a second main circuit, a third branch circuit, a fourth branch circuit, and a fifth branch circuit;
the third branch, the fourth branch and the fifth branch are arranged in parallel, the second main path is connected with the third branch, the fourth branch and the fifth branch in series, and the third branch, the fourth branch and the fifth branch are respectively provided with an amplifier, a broadband mixer, a broadband amplifier, a band-pass filter, a broadband mixer, a broadband amplifier and a band-pass filter in sequence;
two second third switches are arranged on the second main circuit, one second third switch is close to the output end of the second frequency conversion circuit, and the other second third switch is close to the input end of the second frequency conversion circuit.
As shown in FIG. 1, in order to avoid spurious caused by combined interference, finally, the combined interference of frequency conversion channels of 12.7-21.1 GHz is avoided by means of segmentation (12.7-14.37 GHz, 14.27-17.89 GHz and 17.69-21.2 GHz), and the index of final output spurious is effectively ensured.
The invention carries out frequency conversion to 8500MHz, 2150MHz and 3600MHz intermediate frequency signals after the broadband radio frequency signals are gated by a filter, and then carries out secondary frequency conversion to 70MHz intermediate frequency output.
The radio frequency input of the invention is 2-21.2 GHz, and the frequency is changed into 70MHz intermediate frequency signal after two times of frequency conversion, wherein:
the 2-6 GHz channel adopts a high-cost frequency mixing mode, the frequency is mixed up to 8500+/-10 MHz, and then the frequency is mixed down to 70 MHz+/-10 MHz with the 8.57GHz local oscillator by adopting the high-cost frequency mixing mode;
the 5.85-12.75 GHz channel adopts a high-cost mixing mode, the frequency is up mixed to 2150+/-10 MHz, and then the frequency is down mixed to 70 MHz+/-10 MHz with 2.22GHz two local oscillators by adopting the high-cost mixing mode;
the 12.7-21.2 GHz channel adopts a low-cost frequency mixing mode, and is subjected to frequency mixing to 36000+/-10 MHz, and then is subjected to frequency mixing with 3.35GHz two local oscillators to 70 MHz+/-10 MHz;
the radio frequency and local oscillator frequency relationships are shown in table 1-1.
TABLE 1-1 frequency-division-frequency-conversion flow relationship
In-band flatness of the broadband frequency conversion module: the verification process of less than or equal to +/-0.5 dB/20MHz is as follows:
when the device is designed to select the type, the amplifier is a broadband amplifier with small gain fluctuation and small standing wave, all filters belong to customized products, the fluctuation in the band is preferentially ensured on the premise of meeting the suppression degree, and an internal amplitude equalizer is used in the design of the intermediate frequency filter. The equalizing circuit with the characteristics of the intermediate frequency circuit inverse filter is reserved on the radio frequency input segmented switch filtering link, so that the full-band amplitude can be equalized. Fig. 4 shows a wideband amplifier of 2-21.2 GHz, and the S21 graph is shown by fig. 4 to be flat from DC to 30GHz in-band fluctuation, so that the 2-21, 2GHz radio frequency input is fully controllable.
As shown in FIGS. 5-9, for the flatness analysis of the output of the present invention, it can be seen from FIGS. 4-9 that the 2-6 GHz-to-8.5 GHz broadband mixer graph fluctuates by < 1dB in the 8500+ -10 MHz band; the wide-band mixer graph of 5.85-12.75 GHz mixed to 2.15GHz fluctuates by < 1dB in the band of 2150+/-10 MHz; the graph of the wideband mixer mixing 12.7-21.2 GHz to 3.6GHz fluctuates in the frequency bands of 3600+/-10 MHz
1dB; the graph above is the device that most affects in-band ripple, we are completely controlled to within 1dB by choice of the mode.
The frequency of 2-21.2 GHz belongs to a broadband frequency converter, the frequency of frequency conversion is 2 times, and a combined cavity filter and a high-low pass filter are arranged in a link, besides an amplifier, a mixer and a switch, and have in-band fluctuation, and the in-band flatness is finally satisfied by analyzing the device and overlapping the in-band fluctuation of the device and is less than or equal to +/-0.5 dB/20MHz.
Further preferably, the pre-amplifier circuit includes a limiter, a coupler, a 6-bit digital attenuator, a wide-band amplifier, and a wide-band amplifier, wherein the limiter, the coupler, the 6-bit digital attenuator, the wide-band amplifier, and the wide-band amplifier are sequentially connected in series, and the wide-band amplifier is connected with an input terminal of the first trisection switch.
Further optimizing the above embodiment, the device further comprises a comparator, a detector and an amplifier, wherein the comparator, the detector and the amplifier are sequentially connected in series, the input end of the comparator is connected with the output end of the digital attenuation end, and the output end of the amplifier is connected with the input end of the coupler.
The method comprises the steps that a coupler is designed at the radio frequency input end in consideration of the fact that the maximum power of 0.1W is not damaged, a through end signal is supplied to a main channel of a pre-amplifier, the coupled signal enters a radio frequency detector, the amplitude of the signal is detected through the detector, and after the amplitude is higher than a set value, a digital attenuator is started through comparison of a comparator, so that a closed loop AGC circuit is formed. Thus, the frequency converter is fully prevented from being burnt by a large signal.
Further preferably, the output circuit includes a low-pass filter, an intermediate frequency amplifier, a 6-bit digital attenuator, an intermediate frequency amplifier, a low-pass filter, and a band-pass filter sequentially connected in series with the output terminal of the second frequency conversion circuit.
The fixed attenuator is used in the link, so that impedance matching between link devices is effectively ensured, and gain flatness of the link is also ensured.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. A wideband frequency converter, comprising:
the output end of the pre-amplifying circuit is connected with the input end of the first frequency conversion circuit, the output end of the first frequency conversion circuit is connected with the input end of the second frequency conversion circuit, and the output end of the second frequency conversion circuit is connected with the input end of the output circuit;
the first frequency conversion circuit and the second frequency conversion circuit are used for carrying out segmentation frequency division processing on an input signal and outputting the input signal.
2. The wideband frequency converter of claim 1, wherein the first frequency conversion circuit comprises a first main circuit, a first branch circuit, a second branch circuit, and a third branch circuit;
the first branch, the second branch and the third branch are arranged in parallel, the main circuit is respectively connected with the first branch, the second branch and the third branch in series, and the first branch, the second branch and the third branch are all provided with a pre-pass filter;
the main path is provided with two first third switches, one of the first third switches is close to the input end of the pre-pass filter, and the other third switch is close to the output end of the pre-pass filter.
3. The wideband frequency converter according to claim 2, wherein the second frequency conversion circuit includes a second main circuit, a third branch circuit, a fourth branch circuit, and a fifth branch circuit;
the third branch, the fourth branch and the fifth branch are arranged in parallel, the main circuit is connected with the third branch, the fourth branch and the fifth branch in series, and the third branch, the fourth branch and the fifth branch are respectively provided with an amplifier, a broadband mixer, a broadband amplifier, a band-pass filter, a broadband mixer, a broadband amplifier and a band-pass filter in sequence;
two second third switches are arranged on the main circuit, one second third switch is close to the output end of the second frequency conversion circuit, and the other second third switch is close to the input end of the second frequency conversion circuit.
4. A wideband frequency converter according to claim 3, wherein the pre-amplifier circuit comprises a limiter, a coupler, a 6-bit digital attenuator, a wideband amplifier and a wideband amplifier, the limiter, the coupler, the 6-bit digital attenuator, the wideband amplifier and the wideband amplifier being connected in series in sequence, the wideband amplifier being connected to the input of the first third switch.
5. The wideband frequency converter of claim 4, further comprising a comparator, a detector, and an amplifier, wherein the comparator, the detector, and the amplifier are sequentially connected in series, an input of the comparator is connected to an output of the digital attenuation terminal, and an output of the amplifier is connected to an input of the coupler.
6. The wideband frequency converter of claim 4 wherein the output circuit comprises a low pass filter, an intermediate frequency amplifier, a 6-bit digital attenuator, an intermediate frequency amplifier, a low pass filter, and a bandpass filter connected in series with the output of the second frequency converter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311849167.0A CN117792291A (en) | 2023-12-29 | 2023-12-29 | Broadband frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311849167.0A CN117792291A (en) | 2023-12-29 | 2023-12-29 | Broadband frequency converter |
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| CN117792291A true CN117792291A (en) | 2024-03-29 |
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-
2023
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