CN110729969B

CN110729969B - Frequency conversion assembly

Info

Publication number: CN110729969B
Application number: CN201911005198.1A
Authority: CN
Inventors: 赵晋娟; 王志宇; 徐后乐; 高建超; 胡长国; 赵兰
Original assignee: Beijing Aerospace Guangtong Technology Co ltd Branch
Current assignee: Beijing Aerospace Guangtong Technology Co ltd Branch
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2023-08-29
Anticipated expiration: 2039-10-22
Also published as: CN110729969A

Abstract

The invention discloses a frequency conversion assembly, which comprises an MTCA mainboard and an MTCA chassis, wherein the MTCA mainboard is arranged in the MTCA chassis; an input daughter board and an output daughter board are arranged on the MTCA main board, and a local oscillation channel is arranged on the input daughter board and used for generating a power division local oscillation signal; the lower ends of the input sub-board and the output sub-board are provided with down-conversion channels, and the down-conversion channels are used for down-converting the received radio frequency signals into intermediate frequency signals based on the power division local oscillation signals; the upper ends of the input sub-board and the output sub-board are provided with up-conversion channels, and the up-conversion channels are used for up-converting the received intermediate frequency signals into radio frequency signals based on the power division local oscillation signals. The embodiment of the invention provides a frequency conversion assembly which is based on an MTCA architecture and meets the MTCA specification requirements and realizes up-down conversion of a medium frequency signal and a radio frequency signal respectively.

Description

Frequency conversion assembly

Technical Field

The embodiment of the invention relates to the technical field of frequency conversion, in particular to a frequency conversion assembly.

Background

In today's accelerator digital low level systems, the design of high precision amplitude phase control faces a significant challenge.

The conventional digital low-level system has become a bottleneck restricting the processing capacity of the system according to the bus structures such as VME (VersaModule Eurocard, VME), CPCI (Compact Peripheral Component Interconnect, CPCI) and ethernet, and has not been able to meet the requirements of high-throughput and low-delay systems, and as the requirements on higher system bandwidth, bus speed, real-time performance, system reliability, temperature range, heat dissipation and smaller space are higher and higher, a new operation architecture is urgently needed to meet the requirements of signal processing.

The MTCA (Micro Telecom Computing Architecture, MTCA) is used as a novel system bus, is compatible with the high performance and high bandwidth of the ATCA (Advanced Telecom Computing Architecture, ATCA) and the flexibility of the AMC (Advanced Mezzanie Card, AMC), creates extremely high integration, simultaneously greatly reduces the cost and reduces the system space and scale, thereby being capable of well meeting the application requirements of the fields of medium-low end communication, industry, military, medical treatment, multimedia and the like. At present, how to implement the up-down conversion technology of the radio frequency field according to the MTCA architecture and meeting the specification requirements of the MTCA is a problem to be solved.

Disclosure of Invention

The embodiment of the invention provides a frequency conversion assembly, which realizes up-down conversion of a medium frequency signal and a radio frequency signal according to an MTCA architecture and meeting MTCA specification requirements.

An embodiment of the present invention provides a variable frequency assembly, including:

MTCA mainboard and MTCA machine case, the MTCA mainboard install in the MTCA machine case, its characterized in that is provided with on the MTCA mainboard:

the input sub-board and the output sub-board are provided with local oscillation channels, and the local oscillation channels are used for generating power division local oscillation signals;

at least one down-conversion channel is arranged at the lower end of the input sub-board and the lower end of the output sub-board, and the down-conversion channel is used for down-converting the received radio frequency signals into intermediate frequency signals based on the power division local oscillation signals;

the upper end of the input sub-board and the upper end of the output sub-board are provided with at least one up-conversion channel, and the up-conversion channel is used for up-converting the received intermediate frequency signals into radio frequency signals based on the power division local oscillation signals.

Further, the down-conversion channel includes:

the first local oscillator path comprises a first local oscillator amplifier, and the first local oscillator amplifier is used for amplifying the received power division local oscillator signals and obtaining first power division local oscillator signals; the radio frequency channel comprises a first primary amplifier and a first mixer, wherein the first primary amplifier is used for carrying out first primary amplification on the received radio frequency signal and acquiring a first primary radio frequency signal; the first mixer is used for mixing the first power division local oscillation signal with the first primary radio frequency signal and obtaining a first mixed signal.

Further, the down-conversion channel further comprises:

the intermediate frequency channel is arranged at the lower end of the output sub-board and comprises a first filter and a first secondary amplifier, and the first filter is used for filtering the first mixing signal and obtaining a first filtering signal; the first second-stage amplifier is used for performing first-stage amplification on the first filtering signal to output the intermediate frequency signal.

Further, a down-conversion channel is arranged at the lower end of the input sub-board and the lower end of the output sub-board, and a separation wall is arranged between the local oscillator channel and the down-conversion channel; or alternatively, the process may be performed,

the input sub-board lower extreme with output sub-board lower extreme is provided with many down conversion passageway, the local oscillator passageway with be provided with the partition wall between the adjacent down conversion passageway of local oscillator passageway, be provided with the partition wall between the adjacent down conversion passageway.

Further, the up-conversion channel includes:

the second local oscillation path comprises a second local oscillation amplifier, and the second local oscillation amplifier is used for amplifying the received power division local oscillation signals and obtaining second power division local oscillation signals; the intermediate frequency path comprises a second mixer, and the second mixer is used for mixing the second power division local oscillation signal with the received intermediate frequency signal and obtaining a second mixed signal.

Further, the up-conversion channel further includes:

the radio frequency channel is arranged at the upper end of the output daughter board and comprises a second primary amplifier, a second filter and a second secondary amplifier, and the second primary amplifier is used for carrying out second primary amplification on the second mixed signal and obtaining a second primary mixed signal; the second filter is used for filtering the second primary mixing signal and obtaining a second filtering signal; the second-stage amplifier is configured to perform second-stage amplification on the second filtered signal to output the radio frequency signal.

Further, an up-conversion channel is arranged at the upper end of the input sub-board and the upper end of the output sub-board, and a separation wall is arranged between the local oscillator channel and the up-conversion channel; or alternatively, the process may be performed,

the input sub-board upper end with output sub-board upper end is provided with many frequency conversion passageway, the local oscillator passageway with be provided with the partition wall between the adjacent frequency conversion passageway of local oscillator passageway, be provided with the partition wall between the adjacent frequency conversion passageway.

Further, the local oscillator channel includes:

the local oscillation amplifier is used for amplifying the received local oscillation signals;

the local oscillator power divider is used for dividing the amplified local oscillator signal power into multiple paths of power division local oscillator signals.

Further, the input sub-board is covered with a cover plate, and the cover plate covers the input sub-board.

Further, the output sub-board further includes:

and the switch passage is used for controlling the on-off of the radio frequency passage arranged at the upper end of the output daughter board so as to control the on-off of the output radio frequency signal.

The embodiment of the invention provides a frequency conversion assembly, which comprises an MTCA main board and an MTCA machine case, wherein the MTCA main board is arranged in the MTCA machine case; an input daughter board and an output daughter board are arranged on the MTCA main board, and a local oscillation channel is arranged on the input daughter board and used for generating a power division local oscillation signal; the lower ends of the input sub-board and the output sub-board are provided with down-conversion channels, and the down-conversion channels are used for down-converting the received radio frequency signals into intermediate frequency signals based on the power division local oscillation signals; the upper ends of the input sub-boards and the output sub-boards are provided with up-conversion channels, and the up-conversion channels are used for up-converting the received intermediate frequency signals into radio frequency signals based on the power division local oscillator signals, so that the frequency conversion assembly is based on an MTCA framework and meets MTCA standard requirements, and up-and-down conversion of the intermediate frequency signals and the radio frequency signals is realized respectively.

Drawings

Fig. 1 is a schematic structural diagram of a frequency conversion assembly according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a down-conversion channel structure according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an up-conversion channel structure according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a local oscillator channel structure according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an up-down conversion channel according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention will be described in further detail below with reference to the drawings and the specific embodiments, it being understood that the specific embodiments described herein are for purposes of illustration only and not limitation. It should be further noted that, for convenience of description, only some, but not all of the structures related to the embodiments of the present invention are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

Fig. 1 is a schematic structural diagram of a frequency conversion assembly provided by the embodiment of the present invention, where the embodiment of the present invention may be applied to a high-energy physical accelerator, and as shown in fig. 1, the frequency conversion assembly includes an MTCA motherboard 10 and an MTCA chassis (not shown in the figure), where the MTCA motherboard 10 is installed in the MTCA chassis; the MTCA main board 10 is provided with an input sub-board 21 and an output sub-board 22, the input sub-board 21 is provided with a local oscillation channel 40, and the local oscillation channel 40 is used for generating a power division local oscillation signal LO; at least one down-conversion channel 25 is arranged at the lower end of the input sub-board 21 and the lower end of the output sub-board 22, and the down-conversion channel 25 is used for down-converting a received radio frequency signal RF into an intermediate frequency signal IF based on a power division local oscillation signal LO; at least one up-conversion channel 36 is provided at the upper end of the input sub-board 21 and the upper end of the output sub-board 22, and the up-conversion channel 36 is used for up-converting the received intermediate frequency signal IF into a radio frequency signal RF based on the power division local oscillation signal LO.

It should be understood that, in the description of the embodiments of the present invention, the "lower input sub-board", "lower output sub-board", "upper input sub-board" and "upper output sub-board" are merely for convenience of description, and distinguish the two ends of the input sub-board and the output sub-board respectively; for example, the input sub-board includes two ends, one of which may be defined as a first end of the input sub-board and the other end may be defined as a second end of the input sub-board.

Specifically, as shown in fig. 1, the frequency conversion assembly includes an MTCA motherboard 10 and an MTCA chassis, the MTCA motherboard 10 may be installed in the MTCA chassis through a guide rail, and the MTCA motherboard 10 may implement hot plug with the MTCA chassis through a plug-in aid; illustratively, the MTCA motherboard 10 may employ a dual-width card design, which may be sized 148.8mm by 28.95mm by 181.5mm.

Specifically, as shown in fig. 1, the MTCA motherboard 10 is provided with an input sub-board 21 and an output sub-board 22; the input sub-board 21 and the output sub-board 22 may be printed boards, the input sub-board 21 and the output sub-board 22 may be fixedly connected with the MTCA motherboard 10 through screws, and the MTCA motherboard 10 may be provided with an MTCA interface 60, so that the MTCA motherboard 10 and an MTCA system can transmit signals. The input sub-board 21 and the output sub-board 22 can be connected through the coaxial line 101 so as to transmit the radio frequency signal RF and the intermediate frequency signal IF between the input sub-board 21 and the output sub-board 22; it should be noted that fig. 1 only exemplarily shows the number of coaxial lines 101 connecting between the input sub-board 21 and the output sub-board 22, and the number of coaxial lines 101 connecting between the input sub-board 21 and the output sub-board 22 is not particularly limited in the embodiment of the present invention. The MTCA motherboard 10 may be provided with a power supply 50 to provide power for the frequency conversion assembly, and the state information of the MTCA motherboard 10 may be monitored by the MTCA system.

For example, the actual placement positions of the input sub-board 21 and the output sub-board 22 may be back-to-back, i.e. the surface of the input sub-board 21 on which no device is provided and the surface of the output sub-board 22 on which no device is provided face-to-face, so as to avoid signal interference between the input sub-board 21 and the output sub-board 22, and facilitate installation; illustratively, SMA sockets 70 may be disposed on the input sub-board 21 and the output sub-board 22 to connect with cables, so as to facilitate output or input of the RF signal RF and the IF signal IF, and the SMA sockets 70 are SMA sockets commonly used in a common RF circuit.

Specifically, as shown in fig. 1, the input sub-board 21 is provided with a local oscillation channel 40, the local oscillation channel 40 receives a local oscillation signal LO and generates a power division local oscillation signal LO, the power division local oscillation signal LO may be a multi-path power division local oscillation signal LO, and the local oscillation signal LO may be amplified before the power division local oscillation signal LO is obtained, and then the amplified local oscillation signal LO is subjected to power division. Illustratively, a local oscillator channel 40 may be provided on the input daughterboard 21.

Specifically, as shown in fig. 1, the lower ends of the input sub-board 21 and the output sub-board 22 are provided with down-conversion channels 25; the lower end of the input sub-board 21 can be connected with a cable through an SMA socket 70, receives a radio frequency signal RF from the cable, mixes the received radio frequency signal RF based on a power division local oscillation signal LO to obtain a mixed signal, and can amplify the radio frequency signal RF before mixing; the lower end of the output sub-board 22 may be connected to the lower end of the input sub-board 21 through the coaxial line 101, and receive the mixed signal from the lower end of the input sub-board 21 to output the intermediate frequency signal IF, and the mixed signal may be sequentially filtered and amplified before the intermediate frequency signal IF is output. In this way, by arranging the input sub-board 21 and the output sub-board 22 on the MTCA motherboard 10, and then arranging the down-conversion channel 25 at the lower end of the input sub-board 21 and the lower end of the output sub-board 22, the down-conversion channel 25 down-converts the received radio frequency signal RF based on the power division local oscillation signal LO, thereby realizing down-conversion of the radio frequency signal RF into the intermediate frequency signal IF when the MTCA architecture is based on and the MTCA specification is satisfied.

Specifically, as shown in fig. 1, an up-conversion channel 36 is provided at the upper end of the input sub-board 21 and the upper end of the output sub-board 22; the upper end of the input sub-board 21 can be connected with a cable through an SMA socket 70, receives an intermediate frequency signal IF from the cable, and mixes the received intermediate frequency signal IF based on a power division local oscillation signal LO to obtain a mixed signal; the upper end of the output sub-board 22 may be connected to the upper end of the input sub-board 21 through the coaxial line 101, and receive the mixing signal from the upper end of the input sub-board 21 to output the radio frequency signal RF, and the mixing signal may be sequentially amplified, filtered, and amplified before the radio frequency signal RF is output. In this way, by providing the input sub-board 21 and the output sub-board 22 on the MTCA motherboard 10, and then providing the up-conversion channel 36 on the upper end of the input sub-board 21 and the upper end of the output sub-board 22, the up-conversion channel 36 up-converts the received intermediate frequency signal IF based on the power division local oscillation signal LO, thereby implementing up-conversion of the intermediate frequency signal IF into the radio frequency signal RF when the MTCA architecture is based on and the MTCA specification is satisfied.

In the case of meeting the MTCA specification requirement, the embodiment of the invention sets the input sub-board 21 and the output sub-board 22 on the MTCA main board 10; the input sub-board 21 includes a local oscillation channel 40 to provide a power division local oscillation signal LO for up-down conversion, and a down-conversion channel 25 and an up-conversion channel 36 are respectively disposed at two ends of the input sub-board 21 and the output sub-board 22 to implement up-down conversion on the intermediate frequency signal IF and the radio frequency signal RF based on the MTCA architecture, respectively.

Fig. 2 is a schematic diagram of a down-conversion channel structure according to an embodiment of the present invention, optionally, in combination with fig. 1 and fig. 2, the down-conversion channel 25 includes a first local oscillation path 254 and a radio frequency path 251 disposed at a lower end of the input sub-board 21, the first local oscillation path 254 includes a first local oscillation amplifier 2540, and the first local oscillation amplifier 2540 is configured to amplify a received power division local oscillation signal LO and obtain a first power division local oscillation signal LO; the radio frequency path 251 includes a first primary amplifier 2530 and a first mixer 2531, where the first primary amplifier 2530 is configured to perform first primary amplification on a received radio frequency signal RF and obtain a first primary radio frequency signal RF; the first mixer is used for mixing the first power division local oscillation signal LO with the first primary radio frequency signal RF and obtaining a first mixed signal.

Specifically, in conjunction with fig. 1 and fig. 2, the first local oscillator amplifier 2540 amplifies the received power division local oscillator signal and obtains a first power division local oscillator signal LO for mixing, the first primary amplifier 2530 amplifies the received radio frequency signal RF first and obtains a first primary radio frequency signal RF, the first primary amplifier 2530 may be a low noise amplifier, and the low noise amplifier is disposed before the first mixer 2531 to reduce the noise coefficient of the system. The first primary amplifier 2530 transmits the first primary radio frequency signal RF to the first mixer 2531, the first mixer 2531 mixes the first power division local oscillation signal LO with the first primary radio frequency signal RF and obtains a first mixed signal, the first mixer 2531 may be a mixer with a P-1 value of 14dBm or more, the overall trade-off is selected, and other indexes of the mixer are: p-1 is 17dBm, the radio frequency and local oscillation frequency range is 10-1910 MHz, the intermediate frequency range is 50-1800 MHz, the frequency conversion loss is 8.6dB, and the local oscillation power is 17dBm.

Optionally, referring to fig. 1 and fig. 2, the down-conversion channel 25 further includes an intermediate frequency path 252 disposed at a lower end of the output sub-board 22, where the intermediate frequency path 252 includes a first filter 2532 and a first secondary amplifier 2533, and the first filter 2532 is configured to filter the first mixing signal and obtain a first filtered signal; the first second-stage amplifier 2533 is configured to perform a first second-stage amplification on the first filtered signal to output an intermediate frequency signal IF.

Specifically, referring to fig. 1 and fig. 2, the first mixer 2531 transmits the obtained first mixing signal to the first filter 2532, the first filter 2532 filters the first mixing signal and obtains a first filtering signal, and in order to suppress harmonics of the system and intermodulation components generated by mixing, the first filter 2532 may be an LC low-pass filter, and by adopting other device parameters provided by the embodiment of the present invention, suppression of the harmonics may reach more than 36 dBc. The first second-stage amplifier 2533 performs a first second-stage amplification on the first filtered signal to output an intermediate frequency signal IF. In this way, by performing first primary amplification on the input radio frequency signal RF and obtaining the first primary radio frequency signal RF, then mixing the first power division local oscillation signal LO with the radio frequency signal RF after first primary amplification and obtaining a first mixed signal, then filtering the first mixed signal and obtaining a first filtered signal, and finally performing first secondary amplification on the first filtered signal to output an intermediate frequency signal IF, the down-conversion channel 25 down-converts the received radio frequency signal RF into the intermediate frequency signal IF based on the power division local oscillation signal LO, that is, the frequency conversion component is based on the MTCA architecture and meets the requirements of the MTCA specification, so as to realize down-conversion from the radio frequency signal RF to the intermediate frequency signal IF.

Fig. 3 is a schematic diagram of an up-conversion channel structure according to an embodiment of the present invention, optionally, in combination with fig. 1 and fig. 3, the up-conversion channel 36 includes a second local oscillation path 364 and an intermediate frequency path 361 disposed at an upper end of the input sub-board 21, the second local oscillation path 364 includes a second local oscillation amplifier 3640, and the second local oscillation amplifier 3640 is configured to amplify a received power division local oscillation signal LO and obtain a second power division local oscillation signal LO; the intermediate frequency path 361 includes a second mixer 3630, and the second mixer 3630 is configured to mix the second power-division local oscillation signal LO with the received intermediate frequency signal IF, and obtain a second mixed signal.

Specifically, referring to fig. 1 and 3, the second local oscillator amplifier 3640 amplifies the received power division local oscillator signal and obtains a second power division local oscillator signal LO for mixing, the second mixer 3630 mixes the second power division local oscillator signal LO with the received intermediate frequency signal IF and obtains a second mixed signal, and the second mixer 3630 may be a low local oscillator mixer to reduce the overall power consumption of the system; considering spurious response and consumed power during mixing, and that the local oscillation signal LO is relatively close to the output radio frequency signal and is easy to leak, the second mixer 3630 may be a MAC-24LH mixer, and the isolation between the radio frequency signal RF and the local oscillation signal LO may reach 40dB, where other indexes of the mixer are: p-1 is 5dBm, the radio frequency and local oscillation frequency are 300-2400 MHz, the intermediate frequency range DC-700 MHz, the frequency conversion loss is 6.5dB, and the local oscillation power is 10dBm.

Optionally, referring to fig. 1 and fig. 3, the up-conversion channel 36 further includes a radio frequency path 362 disposed at an upper end of the output sub-board 22, where the radio frequency path 362 includes a second stage amplifier 3631, a second filter 3632, and a second stage amplifier 3633, and the second stage amplifier 3631 is configured to amplify the second mixing signal by a second stage and obtain a second stage mixing signal; the second filter 3632 is configured to filter the second primary mixing signal and obtain a second filtered signal; a second stage amplifier 3633 for second stage amplifying the second filtered signal to output a radio frequency signal RF.

Specifically, referring to fig. 1 and 3, the second stage amplifier 3631 amplifies the acquired second mixing signal at a second stage, acquires the second stage mixing signal, filters the 3632 second stage mixing signal, and acquires the second filtered signal, which comprehensively balances the cost requirement and the system index requirement, the second filter 3632 may be an LC band-pass filter, the connector at the input/output end of the LC band-pass filter is an SMA connector, the SMA connector may be detached during installation, and the copper needle at the input/output end is directly welded on the microstrip path, so as to facilitate integration, and other indexes of the LC band-pass filter are: the 3dB bandwidth is 3MHz, the passband insertion loss is less than or equal to 4dB, the suppression is more than or equal to 60 dBc@f0+/-40 MHz, the suppression is more than or equal to 70 dBc@f0+/-80 MHz, the input standing wave is less than or equal to 1.5, and the second-stage amplifier 3633 carries out second-stage amplification on the second filtered signal to output a radio frequency signal RF. In this way, by mixing the second power-division local oscillator signal LO with the received intermediate frequency signal IF and obtaining the first mixed signal, then performing second-stage amplification on the first mixed signal and obtaining the second-stage mixed signal, then filtering the second-stage mixed signal and obtaining the second filtered signal, and finally performing second-stage amplification on the second filtered signal to output the radio frequency signal RF, the up-conversion channel 36 up-converts the received intermediate frequency signal IF into the radio frequency signal RF based on the power-division local oscillator signal LO, that is, the frequency conversion component is based on the MTCA architecture and meets the requirements of the MTCA specification, and up-conversion from the intermediate frequency signal IF to the radio frequency signal RF is realized.

Fig. 4 is a schematic diagram of a local oscillator path structure according to an embodiment of the present invention;

optionally, as shown in fig. 4, the local oscillator path 40 includes a local oscillator amplifier 401, where the local oscillator amplifier 401 is configured to amplify the received local oscillator signal LO; the local oscillator power divider 402 is configured to divide the amplified local oscillator signal LO power into multiple power division local oscillator signals LO.

Specifically, as shown in fig. 4, the local oscillator amplifier 401 amplifies a received local oscillator signal LO, and transmits the amplified local oscillator signal LO to the local oscillator power divider 402, and the local oscillator power divider 402 performs power division on the amplified local oscillator signal LO to obtain a power division local oscillator signal LO. In this way, the local oscillation channel 40 amplifies the received local oscillation signal LO through the local oscillation amplifier 401, and then divides the amplified local oscillation signal LO into power through the local oscillation power divider 402, thereby obtaining the multi-path power division local oscillation signal LO.

It should be understood that in the description of the embodiments of the present invention, the local oscillator amplifier, the local oscillator power divider, the first local oscillator amplifier, the second local oscillator amplifier, the first second amplifier, the second first stage amplifier and the second stage amplifier are all conventional amplifying or power dividing devices in a general radio frequency path, and the description of the local oscillator, the first local oscillator, the second local oscillator, the first second stage, the second stage and the second stage is only for distinguishing different technical schemes and different setting positions of each device in the technical schemes.

Fig. 5 is a schematic diagram of an up-down conversion channel according to an embodiment of the present invention, where, by way of example, with reference to fig. 1 to fig. 5, a local oscillator channel 40 may generate six power division local oscillator signals LO, four paths are provided to the down conversion channel, and two paths are provided to the up conversion channel; four down-conversion channels 25 can be arranged, one path of 1300MHz external reference radio frequency signal RF is down-converted based on the power division local oscillation signal LO and output as 40.625MHz clock signal, and the other paths of 1300MHz sampling radio frequency signal RF of the accelerating cavity, 1300MHz forward power radio frequency signal RF between the klystron and the cavity and 1300MHz reverse power radio frequency signal RF between the klystron and the cavity are respectively down-converted based on the power division local oscillation signal LO into three paths of 40.625MHz intermediate frequency signal IF and respectively output to a low level system for the system to feed back and adjust the cavity sampling signal to meet the beam current requirement; two up-conversion channels 36 can be provided, the low-level system is driven by a reference clock, one path of 40.625MHz excitation intermediate frequency signal IF is sent out, the power division local oscillation signal LO is based on up-conversion and then output into one path of 1300MHz radio frequency signal RF, and then the signal RF is input into an accelerator cavity to realize particle acceleration, and the other path is reserved as backup.

Optionally, referring to fig. 1 and fig. 5, a down-conversion channel 25 is provided at the lower end of the input sub-board 21 and the lower end of the output sub-board 22, and a partition wall 102 is provided between the local oscillator channel 40 and the down-conversion channel 25; or alternatively, the process may be performed,

a plurality of down-conversion channels 25 are arranged at the lower ends of the input sub-board 21 and the output sub-board 22, a separation wall 102 is arranged between the local oscillation channel 40 and the down-conversion channel 25 adjacent to the local oscillation channel 40, and a separation wall 102 is arranged between the adjacent down-conversion channels 25.

Specifically, referring to fig. 1 and 5, the received 1300MHz local oscillation signal LO generates four paths of 1300MHz power division local oscillation signals LO through the local oscillation channel 40, four down conversion channels 25 are disposed at the lower end of the input sub-board 21 and the lower end of the output sub-board 22, a separation wall 102 is disposed between the local oscillation channel 40 and the down conversion channel 25 adjacent to the local oscillation channel 40, and a separation wall 102 is disposed between the adjacent down conversion channels 25, so as to avoid signal interference between the adjacent channels, and down conversion from the radio frequency signal RF in the acceleration cavity and the low level system thereof to the intermediate frequency signal IF is realized with high quality, and the separation wall 102 may be an aluminum material, for example.

Optionally, referring to fig. 1 and fig. 5, an up-conversion channel 36 is provided at the upper end of the input sub-board 21 and the upper end of the output sub-board 22, and a partition wall 102 is provided between the local oscillator channel 40 and the up-conversion channel 36; or alternatively, the process may be performed,

a plurality of up-conversion channels 36 are arranged at the upper ends of the input sub-board 21 and the output sub-board 22, a partition wall 102 is arranged between the local oscillation channel 40 and the up-conversion channel 36 adjacent to the local oscillation channel 40, and a partition wall 102 is arranged between the adjacent up-conversion channels 36.

Specifically, referring to fig. 1 and 5, the received 1300MHz local oscillation signal LO generates two paths of 1300MHz power division local oscillation signals LO through the local oscillation channel 40, two up-conversion channels 36 are disposed at the upper end of the input sub-board 21 and the upper end of the output sub-board 22, a separation wall 102 is disposed between the local oscillation channel 40 and the up-conversion channel 36 adjacent to the local oscillation channel 40, and a separation wall 102 is disposed between the adjacent up-conversion channels 36, so as to avoid signal interference between the adjacent channels, and up-conversion from the intermediate frequency signal IF in the acceleration cavity and the low level system to the radio frequency signal RF is realized with high quality, and the separation wall 102 may be an aluminum material, for example.

Specifically, in conjunction with fig. 1 and fig. 5, when there are provided both four down-conversion channels 25 and two up-conversion channels 36 on the input sub-board 21 and the output sub-board 22, a partition wall 102 is provided between adjacent down-conversion channels 25 and up-conversion channels 36 to avoid signal interference between adjacent channels, and up-down conversion of the intermediate frequency signal IF and the radio frequency signal RF in the acceleration cavity and the low level system thereof is implemented with high quality, and the partition wall 102 may be made of aluminum material, for example.

Optionally, as shown in fig. 1, the input sub-board 21 is covered with a cover plate 103, and the cover plate 103 covers the input sub-board 21.

Specifically, as shown in fig. 1, a cover plate 103 is individually covered on the input sub-board 21 to avoid interference of external signals, and the cover plate 103 may be fixed on the partition wall 102 by screws.

Optionally, the output sub-board 22 further includes: the switch path 100, the switch path 100 is used for controlling the on-off of the radio frequency path 362 arranged at the upper end of the output sub-board 22 to control the on-off of the output radio frequency signal RF.

Specifically, as shown in fig. 1, a switch path 100 may be disposed on the output sub-board 22, where the switch path 100 is used to control on/off of a radio frequency path 362 disposed on the upper end of the output sub-board 22 to control on/off of an output radio frequency signal RF.

The embodiment of the invention follows the MTCA standard, and provides an up-down conversion assembly based on an MTCA framework, which comprises a down conversion channel, an up conversion channel and a local oscillation channel, and designs different schemes for the down conversion channel and the up conversion channel, so that high-efficiency, high-quality and low-cost up-down conversion of intermediate frequency signals and radio frequency signals respectively is realized, and the frequency conversion assembly comprises four down conversion channels, two up conversion channels and one local oscillation channel, and particularly realizes up-down conversion of intermediate frequency signals and radio frequency signals between a specific acceleration cavity and a low-level system.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims

1. The utility model provides a frequency conversion subassembly, includes MTCA mainboard and MTCA machine case, the MTCA mainboard install in the MTCA machine case, its characterized in that is provided with on the MTCA mainboard:

at least one down-conversion channel is arranged at the lower end of the input sub-board and the lower end of the output sub-board, and the down-conversion channel is used for down-converting the received radio frequency signals into intermediate frequency signals based on the power division local oscillation signals; the down-conversion channel includes: the first local oscillator path comprises a first local oscillator amplifier, and the first local oscillator amplifier is used for amplifying the received power division local oscillator signals and obtaining first power division local oscillator signals; the radio frequency channel comprises a first primary amplifier and a first mixer, wherein the first primary amplifier is used for carrying out first primary amplification on the received radio frequency signal and acquiring a first primary radio frequency signal; the first mixer is used for mixing the first power division local oscillation signal with the first primary radio frequency signal and obtaining a first mixed signal; the intermediate frequency channel is arranged at the lower end of the output sub-board and comprises a first filter and a first secondary amplifier, and the first filter is used for filtering the first mixing signal and obtaining a first filtering signal; the first second-stage amplifier is used for performing first second-stage amplification on the first filtering signal to output the intermediate frequency signal;

2. The frequency conversion assembly according to claim 1, wherein a down conversion channel is arranged at the lower end of the input sub-board and the lower end of the output sub-board, and a partition wall is arranged between the local oscillation channel and the down conversion channel; or alternatively, the process may be performed,

3. The frequency conversion assembly of claim 1, wherein the up-conversion channel comprises:

4. A frequency conversion assembly according to claim 3, wherein the up-conversion channel further comprises:

5. The frequency conversion assembly according to claim 3 or 4, wherein an up-conversion channel is arranged at the upper end of the input sub-board and the upper end of the output sub-board, and a partition wall is arranged between the local oscillator channel and the up-conversion channel; or alternatively, the process may be performed,

6. The frequency conversion assembly of claim 1, wherein the local oscillator channel comprises:

7. The variable frequency assembly of claim 1, wherein the input sub-board is covered with a cover plate, the cover plate encasing the input sub-board.

8. The variable frequency assembly of claim 1, wherein the output sub-board further comprises: