CN105404495B - For modulating the high speed PRBS generator and method for generation of wide-band transducer - Google Patents
For modulating the high speed PRBS generator and method for generation of wide-band transducer Download PDFInfo
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- CN105404495B CN105404495B CN201510689510.9A CN201510689510A CN105404495B CN 105404495 B CN105404495 B CN 105404495B CN 201510689510 A CN201510689510 A CN 201510689510A CN 105404495 B CN105404495 B CN 105404495B
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
- G06F7/58—Random or pseudo-random number generators
- G06F7/582—Pseudo-random number generators
Abstract
For modulating the high speed PRBS generator and method for generation of wide-band transducer, belong to pseudo-random sequence and produce field.Solve the problems, such as that jump frequency of the existing modulation wide-band transducer system architecture simply with required cycle pseudo-random sequence can not be compatible.It includes FPGA, N number of parallel serial conversion module, the single-ended balancing transformer of N number of difference and high-frequency clock module；FPGA, for receiving CLK 8 fractional frequency signals, under the triggering of CLK 8 fractional frequency signals, the different parallel random sequence in generation N roads, while the parallel random sequence and N roads identical synchronous difference control signal that tranmitting data register control signal, N roads are different；Serial differential signals for receiving serial differential signals, are transformed to single ended serial signal by the single-ended balancing transformer of each difference, and each single ended serial signal is the cycle pseudo-random sequence alternately changed between { 1 ,+1 } with the jump frequency of clock signal.It is mainly for generation of pseudo-random sequence.
Description
Technical field
The invention belongs to pseudo-random sequence to produce field.
Background technology
In the last few years, compressive sensing theory continues to develop, the theoretical proof signal have it is openness on the premise of, can be with
Synchronous compression and the sampling of signal are realized, original signal is then recovered by appropriate restructing algorithm.Based on compressive sensing theory
Lack sampling method can greatly reduce sampling rate and required storage, transmission data, breach nyquist sampling and determine
The limitation to sampling rate is managed, can be widely used in the field such as image procossing and signal acquisition.
Modulation wide-band transducer Modulated Wideband Converter, MWC are that one kind is based on compressive sensing theory
For the new lack sampling system of multi-band signal.A kind of typical modulation wide-band transducer system is as shown in Figure 2.X in Fig. 2
(t) multi-band signal, p are representedi(t) it is mixing function, h (t) represents ideal low-pass filter, TsFor sampling time interval, yi
[n] is the sampled signal of i-th of passage.It can be seen that modulation wide-band transducer system is made up of multigroup same channels, the master per passage
Element is wanted to include following several parts：Multiplier, low pass filter, uniform sampling module, the sampled data of multigroup passage are made jointly
For signal reconstruction module, the handling process of signal is followed successively by：Mixing, LPF, uniform sampling, signal reconstruction.
Multi-band signal enters modulation wide-band transducer system, is received by m channel parallel, and each passage cycle phase is same
But the different periodic sequence of numerical value is modulated, and the purpose of modulation is frequency spectrum shift, the signal after modulating passes through low pass filtered
Ripple, HFS is filtered, leave low frequency part.Because the cut-off frequency of low pass filter is relatively low, so the band of filtered signal
Width narrows, and signal can thus be sampled with relatively low speed, obtains the global observation data of a series of signal.Then
Carry out low speed sampling again, speed during sampling need be only greater than the width of low pass filter maximum band, so sample rate
The nyquist frequency of signal can be less than.Finally recycle and calculate the system senses matrix asked for and the calculation of related signal reconstruction
Method, by perceiving the mathematical relationship between matrix and sample information, you can recover original signal and its frequency spectrum from the data collected.
In wide-band transducer system is modulated, cycle mixing function realizes the frequency spectrum shift to primary signal, by signal
Frequency spectrum shift is to can use the existing ADC in market to carry out in the frequency range of low speed sampling.In order to retain during moving
All information of original signal, it is desirable to which the jump frequency of mixing function is at least the nyquist frequency of original signal, typical mixing
Function is the cycle pseudo-random sequence alternately changed between { -1 ,+1 } with nyquist frequency.Random sequence refers to each of sequence
Element is the stochastic variable of independent same distribution (Independent Identical Distribution, iid).It is real random
Sequence can not be reappeared, even if there is same input, same output can not be also generated by sequencer, therefore one
As apply in can not use real random sequence, the mainly pseudo-random sequence of practical application, pseudo-random sequence is that have certain
The sequence of the determination of kind of stochastic behaviour, on the one hand it be can be with predetermined, and can repeatedly generate and replicate；
On the one hand it has the statistical property of certain random sequence again.When the peak frequency of original signal is 1GHz, it is desirable to cycle pseudorandom
The jump frequency of sequence is at least 2GHz.
Traditional pseudo-random sequence occurs in circuit design, typically produces puppet using high-speed linear feedback shift register
Random sequence.But because the digit of common high-speed linear feedback shift register is general all in 8-10 positions or so, therefore such as
The pseudo-random sequence that fruit will produce 100 just needs 10-12 piece chips to combine, which not only adds sampling system into
This, while also hard-wired complexity is greatly increased.
In addition, the use of the length of pseudo-random sequence caused by designed linear feedback shift register is fixed, institute
With for given different primary signals, if wanting to improve the accuracy of unlike signal recovery using different pseudo-random sequences,
Hardware circuit must be just redesigned, very inconvenient, such and designed system can only be entered to specific multi-band signal
Row sampling, limitation are stronger.Therefore, it is necessary to which a kind of hardware is easily realized and adaptable high speed PRBS produces
Method.
The content of the invention
The present invention be in order to solve existing modulation wide-band transducer system architecture simply with required cycle pseudo-random sequence
The problem of jump frequency can not be compatible.The invention provides a kind of high speed PRBS generation for being used to modulate wide-band transducer
Device and method for generation.
For modulating the high speed PRBS generator of wide-band transducer, it includes FPGA, N number of parallel serial conversion module, N
Individual differential to single-ended balancing transformer and high-frequency clock module；N is positive integer；
FPGA, for receiving CLK 8 fractional frequency signals, under the triggering of CLK 8 fractional frequency signals, generation N roads it is different and
Row random sequence, while the different parallel random sequence in tranmitting data register control signal, N roads and the control of N roads identical synchronous difference
Signal；
High-frequency clock module, for receiving clock control signal, according to the clock control signal of reception, produce CLK signal；
Each parallel serial conversion module, for receiving CLK signal, all the way parallel random sequence and all the way synchronous difference control letter
Number, parallel random sequence is converted into serial differential signals and the transmission that jump frequency is CLK signal frequency, sent simultaneously
CLK 8 fractional frequency signals；
Each differential to single-ended balancing transformer, for receiving serial differential signals, serial differential signals is transformed to single-ended
Serial signal, each single ended serial signal are the cycle puppet with the alternately change between { -1 ,+1 } of the jump frequency of clock signal
Random sequence.
For modulating the high speed PRBS generator of wide-band transducer, it also includes host computer,
Host computer, for controlling the length and value of the parallel random sequence generated, it is additionally operable to control the frequency of CLK signal.
For modulating the high speed PRBS method for generation of wide-band transducer, the method for generation comprises the following steps：
For receiving CLK 8 fractional frequency signals, under the triggering of CLK 8 fractional frequency signals, different parallel random in generation N roads
Sequence, while the different parallel random sequence in tranmitting data register control signal, N roads and N roads identical synchronous difference control signal
Step；
For receiving clock control signal, according to the clock control signal of reception, the step of producing CLK signal；
For receiving CLK signal, all the way parallel random sequence and all the way synchronous difference control signal, by parallel stochastic ordering
Row are converted into the serial differential signals that jump frequency is CLK signal frequency and transmission, while send the step of CLK 8 fractional frequency signals
Suddenly；
For receiving serial differential signals, serial differential signals are transformed to single ended serial signal, each single ended serial
Signal is the step of replacing the cycle pseudo-random sequence of change between { -1 ,+1 } with the jump frequency of clock signal.
The difference of high speed PRBS method for generation for modulating wide-band transducer is that the method for generation also includes
Following steps：For controlling the length and value of the parallel random sequence generated, the step of being additionally operable to control the frequency of CLK signal.
On the one hand the modulation wide-band transducer based on multiple linear shift registers structure pseudo-random sequence in the prior art
System it is complicated, and the random sequence length exported is non-adjustable, but the pseudo-random sequence speed exported is fast, on the other hand single
Modulation wide-band transducer system architecture solely using FPGA structures is simple, the random sequence adjustable length of output, but generate
The speed of pseudo-random sequence is slow.The described high speed PRBS generator hardware for being used to modulate wide-band transducer of invention is realized
Simply, cost is low, and can change cycle and the length of pseudo-random sequence by changing software logic.It is if wide to modulation with it
Band converting system provide cycle pseudorandom mixing function, not only reduce modulation broadband converting system hardware implementation complexity and
Cost of implementation, and diversified multi-band signal is adapted to, flexibility is good.
The beneficial effect that the present invention is brought is that the system architecture built present invention utilizes a FPGA is simple, and passes through
The mode that FPGA is combined with parallel serial conversion module, while generate multi-path pseudorandom sequence so that the pseudo-random sequence of FPGA generations
Speed improve, caused pseudo-random sequence be meet Bernoulli Jacob distribution sequence, can also pass through host computer On-line Control FPGA
The pseudo random sequence length of generation and value are to adapt to the sampling needs of different primary signals., can be with by host computer flexible configuration
Change jump frequency, the cycle pseudo-random sequence maximum jump frequency that can be realized is 2GHz.
Brief description of the drawings
Fig. 1 is the principle signal of the present invention for being used to modulate the high speed PRBS generator of wide-band transducer
Figure；
Fig. 2 is the structural representation that wide-band transducer is modulated in background technology；
Embodiment
Embodiment one：Illustrate present embodiment referring to Fig. 1, be used to modulate broadband conversion described in present embodiment
The high speed PRBS generator of device, it includes FPGA1, N number of parallel serial conversion module 2, N number of differential to single-ended balancing transformer 3
With high-frequency clock module 4；N is positive integer；
FPGA1, for receiving CLK 8 fractional frequency signals, under the triggering of CLK 8 fractional frequency signals, generation N roads it is different and
Row random sequence, while the different parallel random sequence in tranmitting data register control signal, N roads and the control of N roads identical synchronous difference
Signal；
High-frequency clock module 4, for receiving clock control signal, according to the clock control signal of reception, produce CLK letters
Number；
Each parallel serial conversion module 2, for receiving CLK signal, all the way parallel random sequence and all the way synchronous difference control
Signal, parallel random sequence is converted into serial differential signals and the transmission that jump frequency is CLK signal frequency, sent simultaneously
CLK 8 fractional frequency signals；
Serial differential signals for receiving serial differential signals, are transformed to list by each differential to single-ended balancing transformer 3
Serial signal is held, each single ended serial signal is the cycle alternately changed between { -1 ,+1 } with the jump frequency of clock signal
Pseudo-random sequence.
In present embodiment, CLK signal is clock signal, when CLK speed is 2GHz, FPGA internal logic work
Clock frequency is only 256MHz, greatly reduces the performance requirement to FPGA, so as to reduce hardware implementation cost.
FPGA1 is used to generate random sequence, and random sequence is stored in FPGA after being produced by MATLAB, can also use FPGA
Internal logic unit is realized.FPGA parallel random sequences of output multi-channel under CLK triggering, and control signal is given at a high speed
Clock module 4 and parallel serial conversion module 2, FPGA internal logic are operated under CLK/8 clock frequency.
High-frequency clock module 4 produces the high-speed clock signal that channelized frequencies are CLK simultaneously, and the frequency of the clock can pass through
Host computer flexible configuration.The inside of high-frequency clock module 4 includes crystal oscillator, clock chip, single-ended-differential balance transformation
Device, clock distributor etc..
Parallel serial conversion module 2 receives the CLK clock signals from high-frequency clock module respectively, is completed under its triggering parallel
To serial conversion, output multi-channel jump frequency is CLK serial differential signals.Parallel-serial conversion chip believes CLK clocks simultaneously
Number 8 fractional frequency signals be conveyed to FPGA as trigger signal.
Embodiment two：Illustrate present embodiment referring to Fig. 1, present embodiment with described in embodiment one
The difference of high speed PRBS generator for modulating wide-band transducer is that it also includes host computer 5,
Host computer 5, for controlling the length and value of the parallel random sequence generated, it is additionally operable to control the frequency of CLK signal.
Embodiment three：Illustrate present embodiment referring to Fig. 1, present embodiment with described in embodiment one
The difference of high speed PRBS generator for modulating wide-band transducer is that it also includes power module, power module
For providing electric energy to FPGA1, N number of parallel serial conversion module 2, N number of differential to single-ended balancing transformer 3 and high-frequency clock module 4.
Present embodiment, power module include two panels model LT3021-1.2 chip, a model LT1529IQ-
3.3 chip, model LT3021-1.5 chip and model LT1963-2.5 chip, wherein (1) two panels
LT3021-1.2, the kernel to FPGA11 are powered；(2) LT3021-1.5, reference power source is provided to parallel serial conversion module；(3)
LT1529IQ-3.3, to FPGA some I/O interfaces, high-frequency clock module, parallel serial conversion module power supply；(4) LT1963-2.5,
Some I/O interfaces and GCLK clock signals to FPGA are powered.
Embodiment four：Illustrate present embodiment referring to Fig. 1, present embodiment with described in embodiment one
The difference of high speed PRBS generator for modulating wide-band transducer is, described differential to single-ended balancing transformer 3
Realized using model BD1722J50100AHF chip.
Embodiment five：Illustrate present embodiment referring to Fig. 1, present embodiment with described in embodiment one
The difference of high speed PRBS generator for modulating wide-band transducer is that described parallel serial conversion module 2 uses type
Number for MC100EP446FAG chip realize.
Present embodiment, high-frequency clock module 4 include crystal oscillator CVHD-950-100, clock chip
LMX2541SQ2060E, single-ended-differential balance transformer B0430J50100A00, clock distributor ADCLK944, this clock
Distributor is to divide four tunnels all the way, is a kind of special shape for realizing N roads pseudo-random sequence.Crystal oscillator output 100MHz when
Clock signal, by clock chip LMX2541SQ2060E divide, output frequency be CLK single-ended clock signal, the single ended clock
Signal obtains the differential clocks that impedance is 100 ohm, this differential clocks is LVDS after B0430J50100A00 differential conversions
Level signal, ADCLK944 clock distribution chips can be directly inputted to, from four road differential clock signals of clock chip output
It is LVPECL level, just meets level demand of the parallel serial conversion module 2 to input clock signal, without level conversion electricity
Road.
Embodiment six：Illustrate present embodiment referring to Fig. 1, present embodiment with described in embodiment one
The difference of high speed PRBS generator for modulating wide-band transducer is that described FPGA1 uses model
EP3C25F324C6N chip is realized.
Present embodiment, the present invention utilize this FPGA of the Cyclone III series EP3C25F324C6N of altera corp
Produce.The special clock speed that 6 series are supported may be up to 403MHz (LVPECL)；The output speed of row I/O pins can reach
256MHz。
Embodiment seven：Illustrate present embodiment referring to Fig. 1, present embodiment with described in embodiment one
The difference of high speed PRBS generator for modulating wide-band transducer is that described FPGA1 generates parallel stochastic ordering
It is classified as 8 bit parallel datas.
Embodiment eight：It is used for the high speed PRBS generation side for modulating wide-band transducer described in present embodiment
Method, the method for generation comprise the following steps：
For receiving CLK 8 fractional frequency signals, under the triggering of CLK 8 fractional frequency signals, different parallel random in generation N roads
Sequence, while the different parallel random sequence in tranmitting data register control signal, N roads and N roads identical synchronous difference control signal
Step；
For receiving clock control signal, according to the clock control signal of reception, the step of producing CLK signal；
For receiving CLK signal, all the way parallel random sequence and all the way synchronous difference control signal, by parallel stochastic ordering
Row are converted into the serial differential signals that jump frequency is CLK signal frequency and transmission, while send the step of CLK 8 fractional frequency signals
Suddenly；
For receiving serial differential signals, serial differential signals are transformed to single ended serial signal, each single ended serial
Signal is the step of replacing the cycle pseudo-random sequence of change between { -1 ,+1 } with the jump frequency of clock signal.
Embodiment nine：Present embodiment and the height for being used to modulate wide-band transducer described in embodiment eight
The difference of fast pseudorandom sequence generating method is that the method for generation also comprises the following steps：
For controlling the length and value of the parallel random sequence generated, the step of being additionally operable to control the frequency of CLK signal.
Claims (9)
1. for modulating the high speed PRBS generator of wide-band transducer, it is characterised in that it include FPGA (1), it is N number of simultaneously
String modular converter (2), N number of differential to single-ended balancing transformer (3) and high-frequency clock module (4)；N is positive integer；
FPGA (1), for receiving CLK 8 fractional frequency signals, under the triggering of CLK 8 fractional frequency signals, different parallel in generation N roads
Random sequence, while the different parallel random sequence in tranmitting data register control signal, N roads and N roads identical synchronous difference control letter
Number；
High-frequency clock module (4), for receiving clock control signal, according to the clock control signal of reception, produce CLK signal；
Each parallel serial conversion module (2), for receiving CLK signal, all the way parallel random sequence and all the way synchronous difference control letter
Number, parallel random sequence is converted into serial differential signals and the transmission that jump frequency is CLK signal frequency, sent simultaneously
CLK 8 fractional frequency signals；
Each differential to single-ended balancing transformer (3), for receiving serial differential signals, serial differential signals is transformed to single-ended
Serial signal, each single ended serial signal are the cycle puppet with the alternately change between { -1 ,+1 } of the jump frequency of clock signal
Random sequence.
2. the high speed PRBS generator according to claim 1 for being used to modulate wide-band transducer, it is characterised in that
It also includes host computer (5),
Host computer (5), for controlling the length and value of the parallel random sequence generated, it is additionally operable to control the frequency of CLK signal.
3. the high speed PRBS generator according to claim 1 for being used to modulate wide-band transducer, it is characterised in that
It also includes power module, and power module is used to become to FPGA (1), N number of parallel serial conversion module (2), N number of differential to single-ended balance
Depressor (3) and high-frequency clock module (4) provide electric energy.
4. the high speed PRBS generator according to claim 1 for being used to modulate wide-band transducer, it is characterised in that
Described differential to single-ended balancing transformer (3) is realized using model BD1722J50100AHF chip.
5. the high speed PRBS generator according to claim 1 for being used to modulate wide-band transducer, it is characterised in that
Described parallel serial conversion module (2) is realized using model MC100EP446FAG chip.
6. the high speed PRBS generator according to claim 1 for being used to modulate wide-band transducer, it is characterised in that
Described FPGA (1) is realized using model EP3C25F324C6N chip.
7. the high speed PRBS generator according to claim 1 for being used to modulate wide-band transducer, it is characterised in that
It is 8 bit parallel datas that described FPGA (1), which generates parallel random sequence,.
8. the high speed PRBS method for generation for modulating wide-band transducer, it is characterised in that the method for generation is included such as
Lower step：
For receiving CLK 8 fractional frequency signals, under the triggering of CLK 8 fractional frequency signals, the different parallel stochastic ordering in generation N roads
Row, while the step of the different parallel random sequence in tranmitting data register control signal, N roads and N roads identical synchronous difference control signal
Suddenly；
For receiving clock control signal, according to the clock control signal of reception, the step of producing CLK signal；
For receiving CLK signal, all the way parallel random sequence and all the way synchronous difference control signal, parallel random sequence is turned
The step of changing the serial differential signals that jump frequency is CLK signal frequency and transmission into, while sending CLK 8 fractional frequency signal；
For receiving serial differential signals, serial differential signals are transformed to single ended serial signal, each single ended serial signal
The step of to replace the cycle pseudo-random sequence of change between { -1 ,+1 } with the jump frequency of clock signal.
9. the high speed PRBS method for generation according to claim 8 for being used to modulate wide-band transducer, its feature exist
In the method for generation also comprises the following steps：
For controlling the length and value of the parallel random sequence generated, the step of being additionally operable to control the frequency of CLK signal.
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| CN108121676B (en) * | 2016-11-28 | 2020-09-11 | 上海贝岭股份有限公司 | Circuit for converting digital signal parallel input into serial output |
| CN107979379A (en) * | 2017-11-20 | 2018-05-01 | 北京工业大学 | Modulation wide-band transducer AFE(analog front end) development board based on compressive sensing theory |
| CN109033596A (en) * | 2018-07-16 | 2018-12-18 | 成都吉纬科技有限公司 | Parallel pseudo-random sequences Generator Design method based on FPGA |
| CN110208738B (en) * | 2019-06-13 | 2022-12-06 | 哈尔滨工业大学 | Signal frequency and two-dimensional DOA joint estimation method based on array modulation broadband converter |
| CN112162946A (en) * | 2020-09-17 | 2021-01-01 | 中电科仪器仪表有限公司 | 100Gbps pseudo-random pattern generating device |
| CN112450941A (en) * | 2020-11-11 | 2021-03-09 | 南昌大学 | Electrocardiosignal compression sampling device and method based on random demodulation structure |
| CN112558926A (en) * | 2020-12-16 | 2021-03-26 | 扬州海科电子科技有限公司 | Multi-parameter adjustable high-speed pseudo-random code driving source device |
| CN115079999A (en) * | 2022-06-22 | 2022-09-20 | 长鑫存储技术有限公司 | Random data generation circuit and read-write training circuit |
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