CN103840899B - A kind of transmitting-receiving subassembly automatic test equipment - Google Patents
A kind of transmitting-receiving subassembly automatic test equipment Download PDFInfo
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- CN103840899B CN103840899B CN201410090054.1A CN201410090054A CN103840899B CN 103840899 B CN103840899 B CN 103840899B CN 201410090054 A CN201410090054 A CN 201410090054A CN 103840899 B CN103840899 B CN 103840899B
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Abstract
The present invention relates to a kind of transmitting-receiving subassembly automatic test equipment, belong to large planar array antenna transmitting-receiving subassembly production line testing equipment technical field.It is made up of DDS signal source, mixer assembly, signal transducer, control board, computer etc.Be characterized in: two frequency converters of DDS signal source are connected with the upper frequency mixer of mixer assembly and down-conversion mixer respectively, the output of down-conversion mixer is connected with signal transducer, signal transducer output is connected with control board input, and control board connects computer by network interface.Realize a key and measure whole index, automatic switchover frequency and electronic switch, without the need to artificial stube cable, test result can be preserved in real time and reuse.All measurement results can generate electronic report forms automatically, without the need to manual record, avoid makeing mistakes, and reduce tester use amount.Signal transducer can the signal amplitude, phase place etc. of each passage of Direct Sampling, and test many groups transmitting-receiving subassembly only needs calibration in a week instrument, good operating stability.
Description
Technical field
The present invention relates to a kind of transmitting-receiving subassembly automatic test equipment, belong to large planar array antenna transmitting-receiving subassembly production line testing equipment technical field.
Background technology
Transmitting-receiving subassembly is the indispensable vitals of large planar array antenna, and the quality of transmitting-receiving subassembly is directly connected to the quality of large planar array antenna service behaviour.Therefore, testing one by one hundreds and thousands of transmitting-receiving subassemblies, is the work that manufacturing enterprise must complete.In traditional testing scheme, during the single transmitting-receiving subassembly of each detection, need to employ the multi-section instrument such as vector network analyzer, power meter, signal source, oscilloscope; And at different frequency, there is different characteristics due to transmitting-receiving subassembly, therefore often switch a frequency, first manually to arrange, calibrate the parameter of each instrument, after recording result, again by manually calculating corresponding correction data, then can adjust revising the fixed interface input of data through transmitting-receiving subassembly it.This mode makes preliminary preparation amount large, and test, trimming process are very loaded down with trivial details.In real work, in order to test a transmitting-receiving subassembly, need to purchase a large amount of instrument and the interface cable between instrument and transmitting-receiving subassembly and connector, operate very inconvenient, safeguard also very difficult, increase cost of manufacture, have a strong impact in enormous quantities, high-quality, high efficiency production transmitting-receiving subassembly demand.
Summary of the invention
The object of the invention is to, there is provided a kind of and switch frequency by computer one key, test with calculate correction value and can synchronously carry out, and energy quick storage, timely input and round-off error, greatly reduce human intervention and instrument calibration number of times, adopt standard interface, realize high efficiency, in enormous quantities, high-quality accurate detection and correction, solve after prior art tests front and test at every turn and manually to multi-section instrument, calibration parameter must be set one by one, and manual calculations and input must complete error correction, operation, troublesome maintenance, increase cost of manufacture problem, operation and maintenance is simple and convenient, long service life, the transmitting-receiving subassembly automatic test equipment of effective reduction cost of manufacture.
The present invention realizes above-mentioned purpose by the following technical solutions
This transmitting-receiving subassembly automatic test equipment is made up of DDS signal source, mixer assembly, signal transducer, control board, computer, directional coupler W0 ~ W4, electronic switch S1 ~ S5, attenuator, it is characterized in that: DDS signal source comprises 50 ~ 90MHz frequency converter, 60 ~ 100MHz frequency converter, 16MHz intermediate-frequency channel, and it is connected with mixer assembly respectively by low pass filter; The control signal input of DDS signal source is connected to the control signal output Vdds of control board;
Mixer assembly comprises a upper frequency mixer U1, three down-conversion mixer U2 ~ U4,360MHz local oscillator generator, if bandpas filter/intermediate frequency amplifier, radio frequency band filter/radio frequency amplifiers; The local oscillation signal end V0 of upper frequency mixer U1 and down-conversion mixer U2 ~ U4 is connected in parallel 360MHz local oscillator generator; The signal input part V2 of down-conversion mixer U2 ~ U4 and 60 ~ 100MHz frequency variation signal output of DDS signal source are connected in parallel; The signal input part of upper frequency mixer U1 is connected with 50 ~ 90MHz frequency variation signal output of DDS signal source by if bandpas filter/intermediate frequency amplifier, produces 410MHz ~ 450 MHz radiofrequency signal; The signal output part of upper frequency mixer U1 is connected to directional coupler W0 by radio frequency band filter/radio frequency amplifier, and directional coupler W0 is connected by the radio-frequency (RF) signal input end V1 of feeder line with down-conversion mixer U2, produces 10 MHz intermediate frequency reference signals by uppermixing; The signal input part V2 of down-conversion mixer U3 and down-conversion mixer U4 and 60 ~ 100MHz frequency variation signal output of DDS signal source are connected in parallel, and produce that 10 MHz intermediate frequencies transmit, 10 MHz received IF signals respectively by lower mixing; Directional coupler W0 is connected with external measuring instrument by electronic switch S1; External measuring instrument is connected with transmitting-receiving subassembly; The control end of electronic switch S1 ~ S5 passes through the control signal output of conductor in parallel connection control plate, and electronic switch S4 ~ S5 is connected in series; Electronic switch S5 connects calibration/pumping signal end by wire; Electronic switch S4 is connected in parallel by four attenuators and directional coupler W1 ~ W4, and is connected in parallel by directional coupler W1 ~ W4 and transmitting-receiving subassembly; Electronic switch S2 is connected with the Received signal strength output of transmitting-receiving subassembly; Electronic switch S3 is connected with the incoming signal output of directional coupler W1 ~ W4;
The 10 MHz intermediate frequency reference signals of down-conversion mixer U2 ~ U4,10 MHz intermediate frequencies transmit and to be connected with the input of signal transducer respectively with 10 MHz received IF signal outputs, and the clock signal terminal of signal transducer is connected with the 16MHz clock signal output terminal of DDS signal source; The sampled signal output of signal transducer is connected with the input of control board; The control signal output of control board is connected with the control signal input of DDS signal source; Control board connects computer by RJ45 interface; Control board connects transmitting-receiving subassembly by RS422 signal conversion chip.
Described signal transducer comprises A/D change-over circuit, A/D circuit for switching between two clocks, FPGA programmable gate array chip, five BMA-JFD5G connectors, CJ19T50WJ connector, a DAF15SLS connector; The input of A/D change-over circuit is connected with the benchmark of three down-conversion mixer U2 ~ U4 of mixer assembly, transmitting, receiving intermediate frequency signal output respectively by BMA-JFD5G connector, backs up intermediate-freuqncy signal interface vacant; The output of A/D change-over circuit is connected to FPGA programmable gate array chip; 16MHz clock signal is connected with the input of A/D circuit for switching between two clocks by BMA-JFD5G connector, and the output of A/D circuit for switching between two clocks is connected to FPGA programmable gate array chip; The output of FPGA programmable gate array chip leads up to D/A change-over circuit connecting test mouth, and CJ19T50WJ connector of separately leading up to is connected with the input of control board; FPGA programmable gate array chip is connected with DAF15SLS test jack.
Described control board comprises FPGA programmable gate array chip, PDS210 interface, lan network interface, RJ45 communication interface, EPCS memory, SDRAM memory, RS422 signal conversion chip, TTL chip, DB15 test interface, RS232, USB download interface; The SPI signal of FPGA programmable gate array chip, DDS control signal, clock signal are connected with the output of signal transducer by PDS210 interface with A/D control signal end; Computer is connected with RJ45 communication interface by lan network interface; Transmitting-receiving subassembly is connected by RS422 signal conversion chip; Be connected with electronic switch S1 ~ S5 by TTL chip; DB15 test interface is connected by RS232; Software burn writing equipment is connected by USB download interface; FPGA programmable gate array chip is provided with EPCS memory and SDRAM memory.
The present invention's beneficial effect is compared with prior art
This transmitting-receiving subassembly automatic test equipment is by DDS signal source, mixer assembly, signal transducer, control board and computer, realize a key and measure whole index, automatic switchover frequency and electronic switch, when different lane testing, without the need to manual switching stube cable, meet emergency case in test and can suspend test, real-time saving result, is beneficial to and again imports use.All measurement results can generate electronic report forms automatically, without the need to manual record, save human resources, avoid makeing mistakes, greatly reduce test instrumentation use amount simultaneously, saved cost.Signal source more better than instrument can be provided, each passage can independent filtering, amplification, no matter signal amplitude and phase place, pulse envelope etc. by A/D signal transducer Direct Sampling, and test how many transmitting-receiving subassemblies, all only need within one week, calibrate once, good operating stability.Due to without the need to manual measurement amplitude-phase quantization, calculate correction value, connection and conveying data, the accident effectively avoiding manual intervention to cause, therefore test, revise error whole process more fast, accurately.Simple to operation.Solve well prior art test at every turn before and must manually to multi-section instrument, calibration parameter be set one by one after test, and manual calculations and input must complete error correction, operate, troublesome maintenance, the problem of increase cost of manufacture.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of overall structure schematic diagram of transmitting-receiving subassembly automatic test equipment;
Accompanying drawing 2 is a kind of operation principle schematic diagram of signal transducer of transmitting-receiving subassembly automatic test equipment;
Accompanying drawing 3 is a kind of operation principle schematic diagram of control board of transmitting-receiving subassembly automatic test equipment;
Accompanying drawing 4 is a kind of operation principle schematic diagram of mixer assembly of transmitting-receiving subassembly automatic test equipment.
In figure: 1, DDS signal source, 2, mixer assembly, 3, signal transducer, 4, control board, 5, computer, 6, calibration/pumping signal end, 7, external measuring instrument, 8, transmitting-receiving subassembly, 9, mouth of testing oneself.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention are described in detail:
This transmitting-receiving subassembly automatic test equipment is made up of DDS signal source 1, mixer assembly 2, signal transducer 3, control board 4, computer 5, directional coupler W0 ~ W4, electronic switch S1 ~ S5, attenuator, it is characterized in that: DDS signal source 1 comprises 50 ~ 90MHz frequency converter, 60 ~ 100MHz frequency converter, 16MHz intermediate-frequency channel, and its three is connected with mixer assembly 2 respectively by low pass filter; The control signal input of DDS signal source 1 is connected to the control signal output Vdds of control board 4;
Mixer assembly 2 comprises a upper frequency mixer U1, three down-conversion mixer U2 ~ U4,360MHz local oscillator generator, if bandpas filter/intermediate frequency amplifier, radio frequency band filter/radio frequency amplifiers; The local oscillation signal end V0 of upper frequency mixer U1 and down-conversion mixer U2 ~ U4 is connected in parallel 360MHz local oscillator generator; The signal input part V2 of down-conversion mixer U2 ~ U4 and 60 ~ 100MHz frequency variation signal output of DDS signal source 1 are connected in parallel; The signal input part of upper frequency mixer U1 is connected with 50 ~ 90MHz frequency variation signal output of DDS signal source 1 by if bandpas filter/intermediate frequency amplifier, produces 410MHz ~ 450 MHz radiofrequency signal; The signal output part of upper frequency mixer U1 is connected to directional coupler W0 by radio frequency band filter/radio frequency amplifier, and directional coupler W0 is connected by the radio-frequency (RF) signal input end V1 of feeder line with down-conversion mixer U2, produces 10 MHz intermediate frequency reference signals by uppermixing; The signal input part V2 of down-conversion mixer U3 and down-conversion mixer U4 and 60 ~ 100MHz frequency variation signal output of DDS signal source 1 are connected in parallel, and produce that 10 MHz intermediate frequencies transmit, 10 MHz received IF signals respectively by lower mixing; Directional coupler W0 is connected with external measuring instrument 7 by electronic switch S1; External measuring instrument 7 is connected with transmitting-receiving subassembly 8; The control end of electronic switch S1 ~ S5 passes through the control signal output of conductor in parallel connection control plate 4, and electronic switch S4 ~ S5 is connected in series; Electronic switch S5 connects calibration/pumping signal end by wire; Electronic switch S4 is connected in parallel by four attenuators and directional coupler W1 ~ W4, and is connected in parallel by directional coupler W1 ~ W4 and transmitting-receiving subassembly 8; Electronic switch S2 is connected with the Received signal strength output of transmitting-receiving subassembly 8; Electronic switch S3 is connected with the incoming signal output of directional coupler W1 ~ W4;
The 10 MHz intermediate frequency reference signals of down-conversion mixer U2 ~ U4,10 MHz intermediate frequencies transmit and to be connected with the input of signal transducer 3 respectively with 10 MHz received IF signal outputs, and the clock signal terminal of signal transducer 3 is connected with the 16MHz clock signal output terminal of DDS signal source 1; The sampled signal output of signal transducer 3 is connected with the input of control board 4; The control signal output Vdds of control board 4 is connected with the control signal input of DDS signal source 1; Control board 4 connects computer 5 by RJ45 interface; Control board 4 connects transmitting-receiving subassembly 8 by RS422 signal conversion chip.
Described signal transducer 3 comprises A/D change-over circuit, A/D circuit for switching between two clocks, FPGA programmable gate array chip, five BMA-JFD5G connectors, CJ19T50WJ connector, a DAF15SLS connector; The input of A/D change-over circuit is connected with the benchmark of three down-conversion mixer U2 ~ U4 of mixer assembly 2, transmitting, receiving intermediate frequency signal output respectively by BMA-JFD5G connector, backs up intermediate-freuqncy signal interface vacant; The output of A/D change-over circuit is connected to FPGA programmable gate array chip; 16MHz clock signal is connected with the input of A/D circuit for switching between two clocks by BMA-JFD5G connector, and the output of A/D circuit for switching between two clocks is connected to FPGA programmable gate array chip; The output of FPGA programmable gate array chip leads up to D/A change-over circuit connecting test mouth, and produce self-checking signal, CJ19T50WJ connector of separately leading up to is connected with the input of control board 4; FPGA programmable gate array chip is connected with DAF15SLS test jack.
Described control board 4 comprises FPGA programmable gate array chip, PDS210 interface, lan network interface, RJ45 communication interface, EPCS memory, SDRAM memory, RS422 signal conversion chip, TTL chip, DB15 test interface, RS232, USB download interface; The SPI signal of FPGA programmable gate array chip, DDS control signal, clock signal are connected by the output of PDS210 interface with signal transducer 3 with A/D control signal end; Computer 5 is connected with RJ45 communication interface by lan network interface; Transmitting-receiving subassembly 8 is connected by RS422 signal conversion chip; Be connected with electronic switch S1 ~ S5 by TTL chip; DB15 test interface is connected by RS232; Software burn writing equipment is connected by USB download interface; FPGA programmable gate array chip is provided with EPCS memory and SDRAM memory.(see accompanying drawing 1 ~ 4)
The core devices of the DDS signal source 1 of this transmitting-receiving subassembly automatic test equipment is AD9959, this device possesses four independently active output channels, the intermediate-freuqncy signal that this device produces different frequency is controlled by serial control interface, independently can carry out frequency, phase place, amplitude control, channel isolation is greater than 65dB, has linear frequency phase amplitude scan capability and 16 level frequent phase amplitude modulation capabilities.With four full scale electric currents able to programme independently DAC audio frequency A/D converter, the highest output frequency can reach 200MHz.Produce two-way frequency variation signal by DDS during work, be respectively 50MHz ~ 90MHz and 60MHz ~ 100MHz, this two paths of signals delivers to mixer assembly 2 respectively after low pass filter.
Mixer assembly 2 comprises a upper frequency mixer U1, three down-conversion mixer U2 ~ U4,360MHz local oscillator generator, if bandpas filter/intermediate frequency amplifier, radio frequency band filter/radio frequency amplifiers; Wherein upper frequency mixer is mainly used to produce 410MHz ~ 450 MHz radiofrequency signal.Down-conversion mixer U2 is used for being mixed down 10MH intermediate frequency reference signal by under the 410MHz ~ 450 MHz radiofrequency signal inputted by directional coupler WO and 60MHz ~ 100 MHz frequency converter signal, 360MHz local oscillation signal.Down-conversion mixer U3 ~ U4 is used for launching being mixed down 10MH intermediate frequency under the 410MHz ~ 450 MHz radiofrequency signal of transmitting-receiving subassembly 8 and 60MHz ~ 100 MHz frequency converter signal, 360MHz local oscillation signal, receiving sampled signal.Radio frequency band filter/radio frequency amplifier is used for carrying out filtering and amplification to 410MHz ~ 450 MHz radiofrequency signal.If bandpas filter/intermediate frequency amplifier is used for carrying out filtering and amplification to 50MHz ~ 90MHz intermediate-freuqncy signal.
The effect of mixer assembly 2 mainly contains 3 points:
A, be that 50MHz ~ 90MHz frequency variation signal of DDS signal source 1 being produced and 360MHz are fixed local oscillation signal after up-conversion, produced that frequency is 410MHz ~ 450 MHz, signal amplitude is the reference excitation signal of 10dBm by band pass filter.
B, be that the frequency variation signal of 60 ~ 100MHz that radiofrequency signal and the DDS signal source 1 of 410MHz ~ 450 MHz produces is fixed local oscillation signal with 360MHz carry out lower mixing together with measured radio frequency signal by frequency, the intermediate-freuqncy signal producing 10MHz is delivered to signal transducer 3 and samples, and the amplitude (peak-to-peak value) of this intermediate-freuqncy signal should be less than 2V.This intermediate-freuqncy signal comprises tested transmitting and tested Received signal strength.
Directional coupler W0 ~ W4 for separating of the entering of signal, reflected signal, according to the needs measured, by produce after pumping signal input enter, reflected signal is sent to the measurement interface of specifying.
Electronic switch S1 ~ S5 is responsible for switching channel, transmitting-receiving subassembly 8 has multiple passage, because transmitted data amount is very large during test, can only the data of a single period measurement passage, switching between different passage just needs computer 5 according to the passage bridge electronic switch S1 ~ S5 when pre-test, simultaneously, the signalling channel that launching and receiving is measured is also different, also computer 5 is needed to send switching command according to the measuring condition of current selected, electronic switch S1 ~ S5 is switched by TTL chip signal, the trend of specification signal after being decoded by control board 4.
Attenuator is used for decaying to pumping signal, because transmitting-receiving subassembly 8 receive path can the amplitude of Received signal strength less, mixer assembly 2 signal is out tested by also needing just to deliver to transmitting-receiving subassembly 8 through one-level decay after electronic switch S1 ~ S5, to avoid the receive path damaging transmitting-receiving subassembly 8.
The intermediate-freuqncy signal of input is converted to 14 position digital signals by A/D change-over circuit by signal transducer 3, then by LVDS output interface, Low Voltage Differential Signal level data is sent to control board 4.Adopt LVDS output interface transmission data, the transmission of the two-forty of data, low noise, remote, high accuracy can be realized.Signal transducer 3 one has five BMA-JFD5G connectors, accesses benchmark intermediate-freuqncy signal, emission medium-frequency signal, receiving intermediate frequency signal, backup intermediate-freuqncy signal and 16MHz clock signal respectively; A CJ19T50WJ connector is connected with output signal and 5V digital power that 28 pairs of level forms are LVDS.A DAF15SLS connector is test jack, need not time normal.
Control board 4 adopts model to be that the FPGA programmable gate array chip of EP2S60F672I4N is as terminal data acquisition module, the signals collecting of complete paired data memory circuit, DDS signal source 1, A/D signal transducer 3, network communication configuration and logic control, and various trigging control.
Power supply: access digital power, for DDS signal source 1, mixer assembly 2, signal transducer 3, control board 4 etc. provide 5V or 28V operating voltage by connector CJ19T50WJ.
The course of work of this transmitting-receiving subassembly automatic test equipment is as follows:
During test, first by computer 5, transmitting-receiving subassembly 8 is placed in transmitting or reception test mode, computer 5 sends instruction by network, and control board 4 is decoded into RS422 signal and is transmitted to transmitting-receiving subassembly 8 after receiving instruction.
During emission measurement, switch electronic switch S1 and S5 to transmitting path, switch a certain road that electronic switch S3 selects tested transmitting-receiving subassembly 8; During accepting state, switch electronic switch S1 and S5 to receiving path, switch a certain road that electronic switch S2, S4 select tested transmitting-receiving subassembly 8, and a selected Frequency point, produce three intermediate-freuqncy signal 50MHz ~ 90MHz, 60MHz ~ 100MHz, 16MHz by control board 4 control DDS signal.
The fixing local oscillator of 50MHz ~ 90MHz intermediate-freuqncy signal and 360MHz produces pumping signal after uppermixing, filtering, amplification, pumping signal is through directional coupler WO, produce a signal to lower mixer assembly U2,10MHz intermediate-freuqncy signal is produced through lower mixing together with the fixing local oscillation signal of 60MHz ~ 100MHz, 360MHz, and this signal is delivered to signal transducer 3 benchmark Sampling Interface, after sampling, digital filtering, send i/q signal to control board 4, control board 4 converts the i/q signal received to data, is transmitted through the network to computer 5.
When transmitting-receiving subassembly 8 radiating portion is measured, the fixing local oscillator of 50MHz ~ 90MHz intermediate-freuqncy signal and 360MHz is through uppermixing, filtering, pumping signal 410MHz ~ 450 MHz is produced after amplifying, pumping signal delivers to the excitation input port of transmitting-receiving subassembly 8 after directional coupler WO and electronic switch S1, 200W is amplified to through transmitting-receiving subassembly 8 internal amplifier, again transmitting-receiving subassembly 8 is amplified Hou tetra-tunnel pumping signal and deliver to testing equipment power input ports and directional coupler W1 ~ W4, get directional coupler W1 ~ W4 tetra-road incoming signal and deliver to S3, according to the passage of the tested transmitting-receiving subassembly 8 of current selection send transmitting-receiving subassembly 8 wherein a road incoming signal to lower mixer assembly U4, with 60MHz ~ 100MHz, the fixing local oscillator of 360MHz together through under be mixed to 10MHz intermediate-freuqncy signal, and send signal transducer 3 to launch Sampling Interface this signal, through sampling, send i/q signal to control board 4 after digital filtering, control board 4 converts the i/q signal received to data, be transmitted through the network to computer 5, the data received compare with the data of reference measurement by computer 5, amplitude is obtained after process, phase place, edge before and after impulse waveform, the every launching target of top degradation.
The passage of tested transmitting-receiving subassembly 8 can be switched by control S3 by computer 5 interface, change frequency by computer 5 interface frequency choice box control DDS.During automatic test, a certain road test channel of selected transmitting-receiving subassembly 8, can automatically switch frequency, and the every launching target under all frequencies of one-key operation is measured.
When transmitting-receiving subassembly 8 receiving unit is measured, the fixing local oscillator of 50MHz ~ 90MHz intermediate-freuqncy signal and 360MHz is through uppermixing, filtering, pumping signal 410MHz ~ 450 MHz is produced after amplifying, pumping signal is through directional coupler WO and electronic switch S1, to electronic switch S4 after S5, by the passage bridge pumping signal of the transmitting-receiving subassembly 8 selected to this passage, transmitting-receiving subassembly 8 is delivered to after attenuator and directional coupler, after wide-band amplifier, front end input interface and the electronic switch S2 of testing equipment is delivered in transmitting-receiving subassembly 8 inside, according to the passage of the tested transmitting-receiving subassembly 8 of current selection send transmitting-receiving subassembly 8 wherein a road signal to down-conversion mixer U3, with 60MHz ~ 100MHz, the fixing local oscillator of 360MHz produces 10MHz intermediate-freuqncy signal through lower mixing together, and this signal is sent the reception Sampling Interface of signal transducer 3, through sampling, send i/q signal to control board 4 after digital filtering, control board 4 converts the i/q signal received to data, be transmitted through the network to computer 5, the data received compare with the data of reference measurement by computer 5, gain is obtained after process, every reception index such as phase place, edge before and after amplitude, phase place, impulse waveform, the every launching target of top degradation is obtained after process.
By computer 5 Interface Control electronic switch S2, S4, switch the passage of tested transmitting-receiving subassembly 8, change frequency by computer 5 interface frequency choice box control DDS.During automatic test, a certain road test channel of selected transmitting-receiving subassembly 8, can automatically switch frequency, the every reception index measurement under all frequencies of one-key operation.
The above is the embodiment of this invention, above-mentioned illustrating is not construed as limiting flesh and blood of the present invention, person of an ordinary skill in the technical field can make an amendment above-mentioned embodiment or be out of shape after having read this specification, and does not deviate from the spirit and scope of the invention.
Claims (3)
1. a transmitting-receiving subassembly automatic test equipment, it is made up of DDS signal source (1), mixer assembly (2), signal transducer (3), control board (4), computer (5), directional coupler W0 ~ W4, electronic switch S1 ~ S5, attenuator, it is characterized in that: DDS signal source (1) comprises 50 ~ 90MHz frequency converter, 60 ~ 100MHz frequency converter, 16MHz intermediate-frequency channel, it is connected with mixer assembly (2) respectively by low pass filter; The control signal input of DDS signal source (1) is connected to the control signal output Vdds of control board (4);
Mixer assembly (2) comprises a upper frequency mixer U1, three down-conversion mixer U2 ~ U4,360MHz local oscillator generator, if bandpas filter/intermediate frequency amplifier, radio frequency band filter/radio frequency amplifiers; The local oscillation signal end V0 of upper frequency mixer U1 and down-conversion mixer U2 ~ U4 is connected in parallel 360MHz local oscillator generator; The signal input part V2 of down-conversion mixer U2 ~ U4 and 60 ~ 100MHz frequency variation signal output of DDS signal source 1 are connected in parallel; The signal input part of upper frequency mixer U1 is connected with 50 ~ 90MHz frequency variation signal output of DDS signal source 1 by if bandpas filter/intermediate frequency amplifier, produces 410MHz ~ 450 MHz radiofrequency signal; The signal output part of upper frequency mixer U1 is connected to directional coupler W0 by radio frequency band filter/radio frequency amplifier, and directional coupler W0 is connected by the radio-frequency (RF) signal input end V1 of feeder line with down-conversion mixer U2, produces 10 MHz intermediate frequency reference signals by uppermixing; The signal input part V2 of down-conversion mixer U3 and down-conversion mixer U4 and 60 ~ 100MHz frequency variation signal output of DDS signal source 1 are connected in parallel, and produce that 10 MHz intermediate frequencies transmit, 10 MHz received IF signals respectively by lower mixing; Directional coupler W0 is connected with external measuring instrument (7) by electronic switch S1; External measuring instrument (7) is connected with transmitting-receiving subassembly (8); The control end of electronic switch S1 ~ S5 passes through the control signal output of conductor in parallel connection control plate (4), and electronic switch S4 ~ S5 is connected in series; Electronic switch S5 is connected with calibration/pumping signal end (6); Electronic switch S4 is connected in parallel by four attenuators and directional coupler W1 ~ W4, and is connected in parallel by directional coupler W1 ~ W4 and transmitting-receiving subassembly (8); Electronic switch S2 is connected with the Received signal strength output of transmitting-receiving subassembly (8); Electronic switch S3 is connected with the incoming signal output of directional coupler W1 ~ W4;
The 10 MHz intermediate frequency reference signals of down-conversion mixer U2 ~ U4,10 MHz intermediate frequencies transmit and to be connected with the input of signal transducer (3) respectively with 10 MHz received IF signal outputs, and the clock signal terminal of signal transducer (3) is connected with the 16MHz clock signal output terminal of DDS signal source (1); The sampled signal output of signal transducer (3) is connected with the input of control board (4); The control signal output of control board (4) is connected with the control signal input of DDS signal source (1); Control board (4) connects computer (5) by RJ45 interface; Control board (4) connects transmitting-receiving subassembly (8) by RS422 signal conversion chip.
2. a kind of transmitting-receiving subassembly automatic test equipment according to claim 1, is characterized in that: described signal transducer (3) comprises A/D change-over circuit, A/D circuit for switching between two clocks, FPGA programmable gate array chip, five BMA-JFD5G connectors, CJ19T50WJ connector, a DAF15SLS connector; The input of A/D change-over circuit is connected with the benchmark of three down-conversion mixer U2 ~ U4 of mixer assembly (2), transmitting, receiving intermediate frequency signal output respectively by BMA-JFD5G connector, backs up intermediate-freuqncy signal interface vacant; The output of A/D change-over circuit is connected to FPGA programmable gate array chip; 16MHz clock signal is connected with the input of A/D circuit for switching between two clocks by BMA-JFD5G connector, and the output of A/D circuit for switching between two clocks is connected to FPGA programmable gate array chip; The output of FPGA programmable gate array chip is leaded up to D/A change-over circuit and is connected mouth (9) of testing oneself, and CJ19T50WJ connector of separately leading up to is connected with the input of control board (4); FPGA programmable gate array chip is connected with DAF15SLS test jack.
3. a kind of transmitting-receiving subassembly automatic test equipment according to claim 1, is characterized in that: described control board (4) comprises FPGA programmable gate array chip, PDS210 interface, lan network interface, RJ45 communication interface, EPCS memory, SDRAM memory, RS422 signal conversion chip, TTL chip, DB15 test interface, RS232, USB download interface; The SPI signal of FPGA programmable gate array chip, DDS control signal, clock signal are connected by the output of PDS210 interface with signal transducer (3) with A/D control signal end; Computer (5) is connected with RJ45 communication interface by lan network interface; Transmitting-receiving subassembly (8) is connected by RS422 signal conversion chip; Be connected with electronic switch S1 ~ S5 by TTL chip; DB15 test interface is connected by RS232; Software burn writing equipment is connected by USB download interface; FPGA programmable gate array chip is provided with EPCS memory and SDRAM memory.
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