CN210745084U - S-band up-converter for calibration equipment - Google Patents
S-band up-converter for calibration equipment Download PDFInfo
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- CN210745084U CN210745084U CN201922339375.1U CN201922339375U CN210745084U CN 210745084 U CN210745084 U CN 210745084U CN 201922339375 U CN201922339375 U CN 201922339375U CN 210745084 U CN210745084 U CN 210745084U
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Abstract
The utility model discloses a check-up equipment is with S wave band up converter, including local oscillator module, control module and three the same up-conversion module, the local oscillator module provide local oscillator signal for the up-conversion module, the up-conversion module export S wave band radio frequency signal after second grade mixing with 70MHz intermediate frequency signal, each up-conversion module of control module control in numerical control attenuator' S decrement. The up-converter is realized by adopting a two-stage frequency conversion technology, and after the intermediate frequency signal is mixed with a first-stage local oscillator signal, a first intermediate frequency signal is output; after the first intermediate frequency signal and the second-stage local oscillation signal are mixed, a radio frequency signal is output, the control module controls the attenuation amount of the numerical control attenuator in each up-conversion module, the power of the signal is controlled by controlling the attenuation amount, the power of the signal is consumed, the up-converter can adopt components with lower power, the requirements on the components are reduced, meanwhile, the linearity of the system is improved, and intermodulation is reduced.
Description
Technical Field
The utility model belongs to the technical field of wireless communication equipment, specifically speaking relates to a check-up equipment is with S wave band up converter.
Background
With the continuous development of radio communication, the position of a transmitter in the fields of modern communication and military affairs is very important. The up-conversion unit is used as a key component of the transmitter, and the performance index of the up-conversion unit has great influence on the performance of the transmitter system. Therefore, selecting a reasonable up-conversion architecture is an important means for improving the performance of the transmitter. The S-band up-conversion unit conforms to the development requirement, and a secondary frequency conversion framework is adopted, so that the inter-modulation and harmonic waves generated in the frequency conversion process are greatly reduced, and the system linearity is improved.
The utility model discloses an application number is 201720595708.5 ' S utility model discloses a S wave band up-conversion unit, including a mixing amplification unit, secondary mixing amplification unit, switch filtering unit, switch amplification unit, signal detection unit, the signal input part of secondary mixing amplification unit is connected to the signal output part of a mixing amplification unit, the signal input part of secondary mixing amplification unit ' S signal output part linked switch filtering unit, the signal input part of switch filtering unit ' S signal output part linked switch amplification unit, the signal input part of signal detection unit is connected to a signal output part of switch amplification unit. The utility model adopts a secondary mixing framework, improves the linearity of the system and reduces intermodulation; the utility model discloses a segmentation filtering has improved stray and harmonic suppression degree, has reduced the design degree of difficulty and the cost of wave filter, consequently the utility model has the advantages of simple structure, low cost, stable performance.
The switch filtering component is arranged in the scheme to realize selection of the filter so as to meet different filtering requirements, but a radio-frequency signal to be transmitted has larger power, and a device with enough large power is required to be used in the up-conversion process so as to ensure that the up-conversion unit can normally work, so that the requirements on components are high.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model provides an S-band up-converter for a calibration device, which is realized by adopting a two-stage frequency conversion technology, and outputs a first intermediate frequency signal after an intermediate frequency signal is mixed with a first-stage local oscillation signal; after the first intermediate frequency signal and the second-stage local oscillation signal are mixed, a radio frequency signal is output, the control module controls the attenuation amount of the numerical control attenuator in each up-conversion module, the power of the signal is controlled by controlling the attenuation amount, the power of the signal is consumed, the up-converter can adopt components with lower power, the requirements on the components are reduced, meanwhile, the linearity of the system is improved, and intermodulation is reduced.
In order to achieve the above object, the utility model discloses a solution is: the utility model provides a check-up equipment is with S wave band up-converter, includes local oscillator module, control module and three the same up-conversion module, the local oscillator module provide local oscillator signal for the up-conversion module, the up-conversion module export S wave band radio frequency signal after the second grade mixing with 70MHz intermediate frequency signal, control module control each up-conversion module in numerical control attenuator' S decrement.
The up-conversion module comprises a first low-pass filter, and the first low-pass filter is accessed to a 70MHz intermediate frequency signal and performs low-pass filtering on the signal; the first band-pass filter is connected with the output end of the first low-pass filter and is used for performing band-pass filtering on the signal subjected to the low-pass filtering; the first frequency mixer is connected with the output end of the first band-pass filter and mixes the signals subjected to band-pass filtering with the first local oscillator signals; the second band-pass filter is connected with the output end of the first frequency mixer and is used for carrying out band-pass filtering on the frequency-mixed signal; the first numerical control attenuator is connected with the output end of the second band-pass filter and is used for attenuating the signal after the band-pass filtering; the first amplifier is connected with the output end of the first numerical control attenuator and is used for amplifying the attenuated signals; the third band-pass filter is connected with the output end of the first amplifier and is used for carrying out band-pass filtering on the amplified signal; the second low-pass filter is connected with the output end of the third band-pass filter and used for low-pass filtering the signal subjected to band-pass filtering; the second frequency mixer is connected with the output end of the second low-pass filter and mixes the low-pass filtered signal with a second local oscillator signal; the fourth band-pass filter is connected with the output end of the second frequency mixer and is used for carrying out band-pass filtering on the frequency-mixed signal; the second digital control attenuator is connected with the output end of the fourth band-pass filter and is used for attenuating the signal after the band-pass filtering; the second amplifier is connected with the output end of the second digital control attenuator and is used for amplifying the attenuated signals; the third numerical control attenuator is connected with the output end of the second amplifier and is used for attenuating the amplified signal; the third amplifier is connected with the output end of the third numerical control attenuator and amplifies the attenuated signals, and the fifth band-pass filter is connected with the output end of the third amplifier and outputs S-band radio-frequency signals after attenuating the amplified signals. In the first mixing, no intermodulation stray at the intermediate frequency end falls into the in-band, and the second band-pass filter at the rear end of the first mixer can well restrain the stray at the radio frequency end, and the restrain is better than 50 dBc. And when the frequency is mixed for the second time, no intermodulation stray at the intermediate frequency end falls into the band. And the fourth band-pass filter at the rear end of the second mixer can well restrain the stray at the radio frequency end, and the restrain is better than 50 dBc. Through the isolation of the mixer and the filtering processing of the filter, the clutter can be well suppressed.
The control module controls the attenuation of the first numerical control attenuator, the second numerical control attenuator and the third numerical control attenuator. The maximum attenuation of the first numerical control attenuator and the second numerical control attenuator is 31.5dB, and the maximum attenuation of the third numerical control attenuator is 7.75 dB. The gain adjusting range of the up-converter is mainly determined by a numerical control attenuator in the up-conversion module, and the maximum attenuation value of the three-level attenuator in the whole frequency conversion link can reach 70.75 dB. The attenuation steps of the first numerical control attenuator and the second numerical control attenuator are 0.5dB, the attenuation step of the third numerical control attenuator is 0.25dB, therefore, the minimum attenuation step can be set to be 0.25dB, and the 1dB adjustment step can be realized through the combination of the control bits of the attenuators. The gain stability of the up-conversion module is less than or equal to +/-1 dB/12h at normal temperature, and can meet the requirement that the gain stability is less than or equal to +/-2 dB/12h at high temperature or low temperature.
The gain flatness is related to the amplitude-frequency characteristics of each device in the up-conversion module and the matching among the devices, so the device with good amplitude-frequency characteristics is selected for flattening the gain, for example, an amplifier with good flatness and a filter with small in-band ripple are selected.
The local oscillation module comprises an oscillation source, sinusoidal signals generated by the oscillation source are divided into seven paths through a first power divider, one path of sinusoidal signals is input into the control module as reference, the other six paths of sinusoidal signals are respectively input into a frequency synthesizer as reference, the frequency sources generated by the frequency synthesizers are respectively output to an amplifier for amplification, and the amplified frequency sources are respectively provided to first-stage mixers of the three up-conversion modules as local oscillation signals after being filtered by a low-pass filter. The output frequency of the up-converter is stepped mainly by the frequency of a first local oscillation signal and a second local oscillation signal, the stepping of the first local oscillation signal is 1KHz, and the stepping of the second local oscillation signal is 1 MHz. The entire output frequency is stepped by 1 KHz. The frequency synthesizer adopts a surface-mounted frequency source to generate a frequency source.
The utility model has the advantages that:
(1) the up-converter is realized by adopting a two-stage frequency conversion technology, and after the intermediate frequency signal is mixed with a first-stage local oscillator signal, a first intermediate frequency signal is output; after the first intermediate frequency signal and the second-stage local oscillation signal are mixed, a radio frequency signal is output, the control module controls the attenuation amount of the numerical control attenuator in each up-conversion module, the power of the signal is controlled by controlling the attenuation amount, the power of the signal is consumed, the up-converter can adopt components with lower power, the requirements on the components are reduced, meanwhile, the linearity of the system is improved, and intermodulation is reduced.
Drawings
Fig. 1 is a block diagram of the up-converter of the present invention;
fig. 2 is a schematic diagram of the up-converter of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, an S-band up-converter for calibration equipment includes a local oscillator module, a control module and three same up-conversion modules, where the local oscillator module provides a local oscillator signal for the up-conversion modules, the up-conversion modules output S-band radio frequency signals after performing secondary frequency mixing on 70MHz intermediate frequency signals, and the control module controls the attenuation of a numerical control attenuator in each up-conversion module.
The up-conversion module comprises a first low-pass filter, and the first low-pass filter is accessed to a 70MHz intermediate frequency signal and performs low-pass filtering on the signal; the first band-pass filter is connected with the output end of the first low-pass filter and is used for performing band-pass filtering on the signal subjected to the low-pass filtering; the first frequency mixer is connected with the output end of the first band-pass filter and mixes the signals subjected to band-pass filtering with the first local oscillator signals; the second band-pass filter is connected with the output end of the first frequency mixer and is used for carrying out band-pass filtering on the frequency-mixed signal; the first numerical control attenuator is connected with the output end of the second band-pass filter and is used for attenuating the signal after the band-pass filtering; the first amplifier is connected with the output end of the first numerical control attenuator and is used for amplifying the attenuated signals; the third band-pass filter is connected with the output end of the first amplifier and is used for carrying out band-pass filtering on the amplified signal; the second low-pass filter is connected with the output end of the third band-pass filter and used for low-pass filtering the signal subjected to band-pass filtering; the second frequency mixer is connected with the output end of the second low-pass filter and mixes the low-pass filtered signal with a second local oscillator signal; the fourth band-pass filter is connected with the output end of the second frequency mixer and is used for carrying out band-pass filtering on the frequency-mixed signal; the second digital control attenuator is connected with the output end of the fourth band-pass filter and is used for attenuating the signal after the band-pass filtering; the second amplifier is connected with the output end of the second digital control attenuator and is used for amplifying the attenuated signals; the third numerical control attenuator is connected with the output end of the second amplifier and is used for attenuating the amplified signal; the third amplifier is connected with the output end of the third numerical control attenuator and amplifies the attenuated signals, and the fifth band-pass filter is connected with the output end of the third amplifier and outputs S-band radio-frequency signals after attenuating the amplified signals. In the first mixing, no intermodulation stray at the intermediate frequency end falls into the in-band, and the second band-pass filter at the rear end of the first mixer can well restrain the stray at the radio frequency end, and the restrain is better than 50 dBc. And when the frequency is mixed for the second time, no intermodulation stray at the intermediate frequency end falls into the band. And the fourth band-pass filter at the rear end of the second mixer can well restrain the stray at the radio frequency end, and the restrain is better than 50 dBc. Through the isolation of the mixer and the filtering processing of the filter, the clutter can be well suppressed.
The control module controls the attenuation of the first numerical control attenuator, the second numerical control attenuator and the third numerical control attenuator. The maximum attenuation of the first numerical control attenuator and the second numerical control attenuator is 31.5dB, and the maximum attenuation of the third numerical control attenuator is 7.75 dB. The gain adjusting range of the up-converter is mainly determined by a numerical control attenuator in the up-conversion module, and the maximum attenuation value of the three-level attenuator in the whole frequency conversion link can reach 70.75 dB. The attenuation steps of the first numerical control attenuator and the second numerical control attenuator are 0.5dB, the attenuation step of the third numerical control attenuator is 0.25dB, therefore, the minimum attenuation step can be set to be 0.25dB, and the 1dB adjustment step can be realized through the combination of the control bits of the attenuators. The gain stability of the up-conversion module is less than or equal to +/-1 dB/12h at normal temperature, and can meet the requirement that the gain stability is less than or equal to +/-2 dB/12h at high temperature or low temperature.
The gain flatness is related to the amplitude-frequency characteristics of each device in the up-conversion module and the matching among the devices, so the device with good amplitude-frequency characteristics is selected for flattening the gain, for example, an amplifier with good flatness and a filter with small in-band ripple are selected.
As shown in fig. 2, the local oscillation module includes an oscillation source, a sinusoidal signal generated by the oscillation source is divided into seven paths by the first power divider, one path is input to the control module as a reference, the other six paths are respectively input to a frequency synthesizer as a reference, frequency sources generated by the frequency synthesizers are respectively output to an amplifier for amplification, and the amplified frequency sources are respectively provided to the first-stage mixers of the three up-conversion modules as local oscillation signals after being filtered by a low-pass filter. The output frequency of the up-converter is stepped mainly by the frequency of a first local oscillation signal and a second local oscillation signal, the stepping of the first local oscillation signal is 1KHz, and the stepping of the second local oscillation signal is 1 MHz. The entire output frequency is stepped by 1 KHz. The frequency synthesizer adopts a surface-mounted frequency source to generate a frequency source.
The up-converter of this application still includes power module, and power module is each components and parts power supply in the up-converter.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (7)
1. The utility model provides a check-up equipment is with S wave band up-converter which characterized in that: the local oscillator module provides local oscillator signals for the up-conversion module, the up-conversion module outputs S-band radio-frequency signals after secondary mixing of 70MHz intermediate-frequency signals, and the control module controls the attenuation of the numerical control attenuator in each up-conversion module.
2. The S-band up-converter for a verification device of claim 1, wherein: the up-conversion module comprises a first low-pass filter, and the first low-pass filter is accessed to a 70MHz intermediate frequency signal and performs low-pass filtering on the signal; the first band-pass filter is connected with the output end of the first low-pass filter and is used for performing band-pass filtering on the signal subjected to the low-pass filtering; the first frequency mixer is connected with the output end of the first band-pass filter and mixes the signals subjected to band-pass filtering with the first local oscillator signals; the second band-pass filter is connected with the output end of the first frequency mixer and is used for carrying out band-pass filtering on the frequency-mixed signal; the first numerical control attenuator is connected with the output end of the second band-pass filter and is used for attenuating the signal after the band-pass filtering; the first amplifier is connected with the output end of the first numerical control attenuator and is used for amplifying the attenuated signals; the third band-pass filter is connected with the output end of the first amplifier and is used for carrying out band-pass filtering on the amplified signal; the second low-pass filter is connected with the output end of the third band-pass filter and used for low-pass filtering the signal subjected to band-pass filtering; the second frequency mixer is connected with the output end of the second low-pass filter and mixes the low-pass filtered signal with a second local oscillator signal; the fourth band-pass filter is connected with the output end of the second frequency mixer and is used for carrying out band-pass filtering on the frequency-mixed signal; the second digital control attenuator is connected with the output end of the fourth band-pass filter and is used for attenuating the signal after the band-pass filtering; the second amplifier is connected with the output end of the second digital control attenuator and is used for amplifying the attenuated signals; the third numerical control attenuator is connected with the output end of the second amplifier and is used for attenuating the amplified signal; the third amplifier is connected with the output end of the third numerical control attenuator and amplifies the attenuated signals, and the fifth band-pass filter is connected with the output end of the third amplifier and outputs S-band radio-frequency signals after attenuating the amplified signals.
3. The S-band up-converter for a verification device of claim 2, wherein: the control module controls the attenuation of the first numerical control attenuator, the second numerical control attenuator and the third numerical control attenuator.
4. The S-band up-converter for a verification device of claim 3, wherein: the maximum attenuation of the first numerical control attenuator and the second numerical control attenuator is 31.5dB, and the maximum attenuation of the third numerical control attenuator is 7.75 dB.
5. The S-band up-converter for a verification device of claim 1, wherein: the local oscillation module comprises an oscillation source, sinusoidal signals generated by the oscillation source are divided into seven paths through a first power divider, one path of sinusoidal signals is input into the control module as reference, the other six paths of sinusoidal signals are respectively input into a frequency synthesizer as reference, the frequency sources generated by the frequency synthesizers are respectively output to an amplifier for amplification, and the amplified frequency sources are respectively provided to first-stage mixers of the three up-conversion modules as local oscillation signals after being filtered by a low-pass filter.
6. The S-band up-converter for a verification device of claim 2, wherein: the first local oscillator signal is stepped by 1KHz, and the second local oscillator signal is stepped by 1 MHz.
7. The S-band up-converter for a verification device of claim 5, wherein: the frequency synthesizer adopts a surface-mounted frequency source to generate a frequency source.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009438A (en) * | 2021-05-25 | 2021-06-22 | 成都雷通科技有限公司 | Emission type radio frequency injection type broadband multi-target simulator |
| CN113225021A (en) * | 2021-04-30 | 2021-08-06 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Ultra-wideband constant-temperature down converter |
| CN113645728A (en) * | 2021-05-24 | 2021-11-12 | 中国电子科技集团公司第十三研究所 | Microwave generator of phase control system and frequency source chip thereof |
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2019
- 2019-12-23 CN CN201922339375.1U patent/CN210745084U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113225021A (en) * | 2021-04-30 | 2021-08-06 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Ultra-wideband constant-temperature down converter |
| CN113225021B (en) * | 2021-04-30 | 2022-07-29 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Ultra-wideband constant-temperature down converter |
| CN113645728A (en) * | 2021-05-24 | 2021-11-12 | 中国电子科技集团公司第十三研究所 | Microwave generator of phase control system and frequency source chip thereof |
| CN113009438A (en) * | 2021-05-25 | 2021-06-22 | 成都雷通科技有限公司 | Emission type radio frequency injection type broadband multi-target simulator |
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