CN202309726U - PXI bus based radio frequency realtime measuring and vector analyzing module with card insertion type structure - Google Patents

Abstract

The utility model relates to a PXI bus based radio frequency realtime measuring and vector analyzing module with a card insertion type structure, comprising a PXI interface, an intermediate frequency signal processing circuit (1), an analog to digital conversion circuit (2), a receiver circuit (3), a frequency synthesizer circuit (4), and a peripheral insertion card E, which are integrated to form an integral body with a modularized structure. According to upper level software platform and bottom level realtime measuring and controlling and data analyzing and processing portions, through employing a modularized integral design method and an FPGA develop tool, the PXI bus based radio frequency realtime measuring and vector analyzing module with a card insertion type structure can realize the functions of radio frequency frequency spectrum realtime measurement, vector signal analysis, a plurality of display selection and data processing, simultaneously can provide rapid realtime measurement and control, such as high speed information processing, realtime calibration and correction, system self-check and fault diagnosis, etc., and has the characteristics of being reasonable in design, compact in structure, orderly in arrangement, ingenious in installation, convenient in use and reliable in working, etc.

Description

Measure vector analysis card insert type construction module in real time based on the radio frequency of PXI bus

Technical field

The utility model relates to a kind of real-time measurement vector analysis module, and particularly a kind of radio frequency based on the PXI bus is measured vector analysis card insert type construction module in real time.

Background technology

Since the PXI bussing technique comes out, be widely used and development rapidly based on the Auto-Test System of PXI bus.Such as:

" electronic design technology " the 114th page that 2002 10 phases published introduced the PXI-5660 VSA that the up-to-date release of NI company is measured the radiofrequency signal of 9kHz to 2.7GHz.This instrument comprises digital low-converter, the IF digitizer of a 2.7GHz and is used for LabVIEW and the spectrum measurement instrument of LabWindow/CVI (SMT).This analyzer is done spectrum measurement radiofrequency signal is down-converted to intermediate frequency, carries out digital sample through frequency overlapped-resistable filter at intermediate frequency.After the digital signal of sampling was passed through digital quadrature decomposition, filtering, extraction and interior inserting, (Fast Fourier Transform FFT) transformed from the time domain to frequency domain with signal, accomplishes signal frequency spectrum measuring to pass through fast Fourier transform again.Digital signal processor is done the picking rate that the FFT arithmetic speed is much slower than signal; When the transient behavior signal appears at signal processing time; Instantaneous signal is lost, the ability that the transient behavior radiofrequency signal was measured when visible PXI-5660 VSA lacked.

In the product of domestic present PXI platform, in the majority with PXI data acquisition equipment and generation equipment, like PXI data collecting card, PXI waveform generator etc., this type is simple based on the application of PXI bus.41 AV6951 model PXI RF spectrum analysis appearance of electricity during domestic spectrum analysis module based on the PXI bus also only has, but the maximum resolution bandwidth has only 1M, can not satisfy the demand of the big broadband of modern communications signal developing direction.

Summary of the invention

The purpose of the utility model is exactly in order to overcome the deficiency of above-mentioned prior art, to provide a kind of reasonable in design, can satisfy the radio frequency based on the PXI bus that the large coverage of signal of communication frequency domain is observed demand and measure vector analysis card insert type construction module in real time.

In order to achieve the above object, the technical scheme of the utility model employing is:

A kind of radio frequency based on the PXI bus is measured vector analysis card insert type construction module in real time; Include PXI interface and signal processing circuit of intermediate frequency 1; Analog to digital conversion circuit 2, receiver circuit 3, frequency synthesizer circuit 4 are together with the plug-in card E of peripheral hardware, and combining constitutes a modular construction integral body.Wherein:

Said PXI interface and signal processing circuit of intermediate frequency 1 include pci interface chip U1 again, fpga chip U2; SDRAM chip U3, DDC chip U4 and clock chip U6 adopt the PCI+FPGA framework; And the U1 model is PCI9030; 32 33MHZ follower's chips of its accord with PCI V2.2 standard can make PCI spit and send out transmission speed up to 132MB/S, support multiplexed and non-multiplexed 32 bit address of local bus/data protocol; The U2 model is XC3SD1800A, it in the PXI bus to triggering the electrical code requirement of bus, the response through the programming of FPGA being accomplished triggering signal and the generation realization PXI interface of triggering signal; The U3 model is HY5V52A, is used to accomplish the storage and the read operation of the required a large amount of digital signal of FPGA; The U4 model is HSP50016, is used for accomplishing to the back signal of sampling

Digital Down Convert handle; U6 is the local clock chip, provides to adapt to the requirement that the PCI difference is spitted a transmission rate, and the reference clock signal of DDC chip, ADC chip and PLL chip.

Analog-digital conversion circuit as described 2; Be ADC chip U5, its model is AD6645, and the analog signal conversion that U7 chip in the receiver circuit 3 is exported is a digital signal; And deliver to the DDC chip U4 in PXI interface and the signal processing circuit of intermediate frequency 1, realize that the numeric field of signal is handled.

Said receiver circuit 3; Include filter chip U7, U8, U9 and attenuator chip U10 again; Adopt mixing+filter structure, according to the upper strata command request, this circuit receives three grades of local oscillation signals of U15 chip, U12 chip and the output of U11 chip from frequency synthesizer circuit 4; Completion to the input signal mixing after, realize the down-conversion of analog signal.Signal behind the afterbody mixing and filtering is the IF signal, and the DDC chip U4 that delivers in PXI interface and the signal processing circuit of intermediate frequency 1 carries out the numeric field processing.

Said frequency synthesizer circuit 4 comprises PLL chip U11, U12 and U17 again, LPF chip U13; PD chip U14; YTO chip U15 and frequency divider M/N chip U16 adopt three grades of PLL phase-locked loop frameworks, and PLL chip U11, U12 and U17 are the locking of frequency single-point; LPF chip U13, PD chip U14, YTO chip U15 constitutes the loop that locking frequency is variable, according to the upper strata command request, in single-point frequency of variable scope lock, and delivers to the receiver circuit 3 SRF radiofrequency signals received with it and carries out mixing.

The utility model mainly comprises upper layer software (applications) platform and real-time observing and controlling of bottom and data analysis processing two large divisions in the systems soft ware of measuring vector analysis card insert type construction module based on the radio frequency of PXI bus in real time; Adopt modular overall design approach; Dispatched by the unification of system management layer, it is simple and direct to make every effort to the observing and controlling clear process.The PXI bus is based on the Standard PC technology, and the user just can use familiar standard Windows software architecture.Based on the exploitation of the PXI system of Windows and operation also just with based on the exploitation of the standard pci system of Windows with move identical.In addition, because the PXI backboard uses the pci bus of industrial standard, in many cases, the software program of writing with the PXI devices communicating is identical with the software program of writing with the PCI module communication.System's upper layer software (applications) adopts the programming platform based on Windows, advanced storage administration mechanism to realize man-machine interaction and bottom layer driving.Mainly comprise: virtual key processing capacity, display format and data processing function, bottom layer driving/configuration feature etc.Observing and controlling in real time and data analysis processing section utilize the FPGA developing instrument; Observing and controlling in real time fast is provided when realizing multiple measurement, data processing function, mainly comprises real time high-speed information processing, real time calibration and correction, System self-test and failure diagnosis etc.

In sum, the utility model has following 7 remarkable functions:

1, the real-time receiving function in broadband

The combination of frequency synthesizer and intermediate-frequency filter has promoted the bandwidth of may observe signal greatly; Can the while come in the signals collecting that real-time bandwidth reaches 20MHZ to handle, the real-time bandwidth of 20MHZ has extended the ability of fft analysis and the vector analysis of I-Q digital demodulation.

2, real time spectrum measurement function

The real-time image data of ADC, and with storage in internal memory, to each frame of data, all be seamless in time, (through real-time, effectively trigger), in DSP, carry out data operation, show in real time with multiple display mode then.The operation of approximate flowing water has guaranteed the power that the real time spectrum of this equipment is measured.

3, the display analysis mode of plurality of optional

Spectrogram, spectrogram, waterfall figure, planisphere, eye pattern, meet the demand that demonstrations such as table can be satisfied user's multi-angle observation signal.

4, many trigger modes function

Triggering is most important to catching time-domain information, and PXI RF spectrum analysis appearance provides triggering modes such as power trigger, level triggers, makes system can accurately catch characteristic signal, carries out labor.

5, advanced person's system bus platform

The PXI bus has combined the characteristic of robustness, modularization and Eurocard mechanical encapsulation of electric bus characteristic and the CompactPCI of PCI; And special synchronous bus and main software characteristic have been increased; Can be at faster speed; Better degree of compatibility, more stable performance guarantee the stability of instrument and equipment operation and the promptness of function renewal.

6, vector signal analytic function

The real powerful part of PXI RF spectrum analysis appearance is that it analyzes the ability of time dependent sophisticated signal; Analysis project comprises EVM, carrier leak, symbol rate, planisphere, frequency error, quadrature error, modulation accuracy, distortion measurement etc.; Through vector analysis, the user can rapid evaluation and digital modulation signals is carried out mistake.

7, stored digital oscillography function

Signal can be selectively through the conditioning of baseband signal modulate circuit, trigger with the time under logical circuit such as base control controls, become digital signal through high speed acquisition, deposit in the massage storage.Through in numeric field, signal is carried out processing such as filtering, linear interpolation, accurately demonstrate the time domain waveform of signal.

In addition, the utility model is measured vector analysis card insert type construction module in real time based on the radio frequency of PXI bus and on technology, is adopted the design of low-power consumption integral layout, surface mount and " drop in " technology; Make compact conformation, rationally distributed, install ingenious; Accomplish that implementation is more flexible; Extensibility is easier, satisfies test of current digit communication system and the requirement of analyzing fully, adapts to the needs of development communication technologies.

Description of drawings

Fig. 1 is the whole electrical schematic diagram of the utility model.

Symbol description among the figure:

1 is PXI interface and signal processing circuit of intermediate frequency, and wherein U1 is a pci interface chip, and U2 is a fpga chip, and U3 is the SDRAM chip, and U4 is the DDC chip, and U6 is a clock chip;

2 is analog to digital conversion circuit, and wherein U5 is the ADC chip;

3 is receiver circuit, and wherein U7 is the IF filter chip, and U8 and U9 are filters

Chip, U10 are the attenuator chips;

4 is frequency synthesizer circuit, and wherein U11, U12 and U17 are the PLL chips, and U13 is the LPF chip, and U14 is the PD chip, and U15 is the YTO chip, and U16 is a frequency divider M/N chip.

Embodiment

See also shown in Figure 1ly, be the utility model specific embodiment.

As can beappreciated from fig. 1: the utility model includes PXI interface and signal processing circuit of intermediate frequency 1, and analog to digital conversion circuit 2, receiver circuit 3, frequency synthesizer circuit 4 are together with the plug-in card E of peripheral hardware, and combining constitutes a modular construction integral body, wherein:

Said PXI interface and signal processing circuit of intermediate frequency 1 are PCI+FPGA and DDC+FPGA framework; Be provided with pci interface chip U1; DDC chip U4; Fpga chip U2, SDRAM chip U3 and clock chip U6, and the address of pci interface chip, data and control port directly are connected with the PXI bus through plug-in card E; The HP port of pci interface chip U1 directly is two-way the connection with the FP port of fpga chip U2; The 7th, 9 pin of DDC chip U4 directly are connected with the 11st, 12 pin of fpga chip U2 respectively successively; The FD port of fpga chip U2 directly is two-way the connection with the corresponding port of SDRAM chip U3.

Analog-digital conversion circuit as described 2 is provided with ADC chip U5, and the 8th, 3 pin of ADC chip U5 successively respectively with PXI interface and signal processing circuit of intermediate frequency 1 in the 5th pin and the 3rd pin of clock chip U6 of DDC chip U4 directly be connected.

Said receiver circuit 3; Be 3 grades of mixing+3 grade filtering frameworks; Be provided with III, II, 3 frequency mixers of I; 3 filter chip U7, U8 and U9 and 1 attenuator chip U10, and attenuator chip U10 is tandem type and is connected with I, II, III frequency mixer successively with filter U9, U8 and U7, and the 5th pin of ADC chip U5 directly is connected in the 11st pin of filter chip U7 and the analog to digital conversion circuit 2.

Said frequency synthesizer circuit 4; Be 3 grades of PLL phase-locked loop frameworks; Be provided with 3 PLL chip U11, U12 and U17,1 LPF chip U13,1 PD chip U14; 1 YTO chip U15 and 1 M/N chip U16, and the 6th pin of PLL chip U17 directly is connected with PLL chip U11 and U12 the 10th pin and the 5th pin of PD chip U14 separately respectively simultaneously; And the 2nd pin of YTO chip U15 and PLL chip U12 and U11 the 12nd pin separately successively respectively with receiver circuit 3 in the 8th pin of I, II, III frequency mixer directly be connected.

Said plug-in card E is a 3UPXI4 groove position normal structure, is provided with 2 connectors, and wherein 1 is 1 groove position, provides 32 for being used for the business of PCI local bus definition, and 1 is 3 grooves in addition, is provided for 64 business for PCI transmission and realization PXI electrical characteristic.

Basic mechanical design feature in the practical implementation of the utility model is following:

One, frequency characteristic

Frequency range 100kHz～3GHz

Maximum analysis bandwidth 20MHz

Resolution bandwidth (RBW) 1Hz～3MHz, the 1-3-10 stepping

Input power range (continuously)-120dBm～+ 30dBm

RF input attenuation 0～50dB (10dB stepping)

Two, radiofrequency signal frequency conversion

First local oscillator, 3.2814～6.2814GHz

The second local oscillator 3.0GHz

The 3rd local oscillator 260MHz

Export the 3rd intermediate frequency 21.4MHz output, maximum bandwidth 20MHz

Three, Digital IF Processing

Fft analysis frame length maximum 4096

Measure the display format spectrogram

Above embodiment is the utility model preferred embodiment, but technical characterictic and embodiment in order to the utility model to be described are not in order to limit the right of applying for a patent of the utility model; Above simultaneously description should be understood and implemented for knowing those skilled in the art.Therefore, other are not breaking away under the prerequisite that the utility model discloses, and the change of the equivalence of completion or modification all are included in the described claim.

The utility model is that a rare radio frequency based on the PXI bus is measured vector analysis card insert type construction module in real time, and creative, novelty, practicality and progressive meet the utility application important document, so file an application according to Patent Law.

Claims (4)

1. measure vector analysis card insert type construction module in real time based on the radio frequency of PXI bus; Include PXI interface and signal processing circuit of intermediate frequency (1); Analog to digital conversion circuit (2), receiver circuit (3), frequency synthesizer circuit (4) is together with the plug-in card E of peripheral hardware; Combining constitutes a modular construction integral body, it is characterized in that;

Said PXI interface and signal processing circuit of intermediate frequency (1) are PCI+FPGA and DDC+FPGA framework; Be provided with pci interface chip U1; DDC chip U4; Fpga chip U2, SDRAM chip U3 and clock chip U6, and the address of pci interface chip, data and control port directly are connected with the PXI bus through plug-in card E; The HP port of pci interface chip U1 directly is two-way the connection with the FP port of fpga chip U2; The 7th, 9 pin of DDC chip U4 directly are connected with the 11st, 12 pin of fpga chip U2 respectively successively; The FD port of fpga chip U2 directly is two-way the connection with the corresponding port of SDRAM chip U3.

2. the radio frequency based on the PXI bus as claimed in claim 1 is measured vector analysis card insert type construction module in real time, it is characterized in that:

Analog-digital conversion circuit as described (2) is provided with ADC chip U5, and the 8th, 3 pin of ADC chip U5 directly are connected with the 5th pin of the middle DDC chip U4 of signal processing circuit of intermediate frequency (1) and the 3rd pin of clock chip U6 with the PXI interface respectively successively.

3. the radio frequency based on the PXI bus as claimed in claim 1 is measured vector analysis card insert type construction module in real time, it is characterized in that:

Said receiver circuit (3); Be 3 grades of mixing+3 grade filtering frameworks; Be provided with III, II, 3 frequency mixers of I; 3 filter chip U7, U8 and U9 and 1 attenuator chip U10, and attenuator chip U10 is tandem type and is connected with I, II, III frequency mixer successively with filter U9, U8 and U7, and the 5th pin of ADC chip U5 directly is connected in the 11st pin of filter chip U7 and the analog to digital conversion circuit (2).

4. the radio frequency based on the PXI bus as claimed in claim 1 is measured vector analysis card insert type construction module in real time, it is characterized in that:

Said frequency synthesizer circuit (4); Be 3 grades of PLL phase-locked loop frameworks; Be provided with 3 PLL chip U11, U12 and U17,1 LPF chip U13,1 PD chip U14; 1 YTO chip U15 and 1 M/N chip U16, and the 6th pin of PLL chip U17 directly is connected with PLL chip U11 and U12 the 10th pin and the 5th pin of PD chip U14 separately respectively simultaneously; And the 2nd pin of YTO chip U15 and PLL chip U12 and U11 the 12nd pin separately successively respectively with receiver circuit (3) in the 8th pin of I, II, III frequency mixer directly be connected.

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