CN102386849B - 10MHz bandwidth noise signal generating device and noise signal generating method - Google Patents
10MHz bandwidth noise signal generating device and noise signal generating method Download PDFInfo
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Abstract
The invention discloses a 10MHz bandwidth noise signal generating device and a noise signal generating method. The noise signal generating device comprises a field programmable gate array (1) and a digital-to-analog converter A (2) which are connected through a conducting wire, wherein, the digital-to-analog converter A (2) is connected with a low-pass filter (3) through the conducting wire; and the low-pass filter (3) is connected with a magnifier Y (4) through the conducting wire. During the conventional generation of the Gauss white noise signal through m sequences, in order to increase the period of the Gauss white noise signal, the length of the pseudo noise code flow of the m sequences is required to increase, that is, the number of stages of the m sequences is required to increase, so the problems of increased hardware spending and complex structure are generated, which are solved by the invention.
Description
Technical field
The present invention relates to broadband noise and noise signal control field, refer more particularly to noise signal generation device and the production method of 10MH z.
Background technology
Noise signal is a kind of application signal very widely, twentieth century, and researcher has carried out research widely to noise signal, and has proposed a lot of noise models, and especially white Gaussian noise model is the focus of discussing.
White noise is a kind of desirable random signal, and it is in certain bandwidth range, and average is zero, and power is evenly distributed.The white noise of Normal Distribution or Gaussian Profile, is called again white Gaussian noise.At present, the method that produces white Gaussian noise signal is a lot, generally adopts and produces by some way random sequence, then obtain by some conversion.Random sequence can be divided into two classes: the one, and true random sequence, utilize the analogue device such as diode, resistance to produce, but its stochastic behaviour can drift about, wayward, and is subject to the impact of time, temperature and other environmental condition larger.The 2nd, pseudo random sequence, adopts Digital Logical Circuits to produce, and produces because it has completely according to definite rule, can repeat acquisition under similarity condition, and is easy to the advantages such as realization and is widely used.Pseudo random sequence has m sequence, Gold sequence, Walsh sequence and R-S sequence etc., in the time utilizing m sequence to realize white Gaussian noise signal, in order to increase the white Gaussian noise signal period, need to increase m sequence pseudo random code stream length, increase m sequence progression, thereby increase hardware spending, causes complex structure.
Summary of the invention
The technical problem to be solved in the present invention:
A kind of 10MHz band noise signal generation device and noise signal production method are provided, while realizing white Gaussian noise signal to solve the existing m of utilization sequence, in order to increase the white Gaussian noise signal period, need to increase m sequence pseudo random code stream length, increase m sequence progression, thereby increase hardware spending, causes complex structure and other problems.
Technical scheme of the present invention:
A kind of 10MHz band noise signal generation device, it comprises: field programmable gate array and digital to analog converter A, field programmable gate array is connected by wire with digital to analog converter A, and digital to analog converter A is connected by wire with low pass filter, and low pass filter is connected by wire with amplifier Y.
Field programmable gate array is connected by wire with digital to analog converter B, and digital to analog converter B is connected by wire with digital to analog converter A.
Digital to analog converter A output is connected by wire with amplifier Z input, and amplifier Z output is connected by wire with digital to analog converter A input.
The noise signal production method of 10MHz band noise signal generation device, it comprises following step:
Step 1, field programmable gate array export to control the reference level of digital to analog converter A by the simulation that regulates digital to analog converter B, thereby it is adjustable to realize white Gaussian noise signal amplitude.
Step 2, by adjusting amplifier Z, to make the output center voltage of digital to analog converter A be 0V, taking the amplitude equalizing value that realizes white Gaussian noise signal as zero.
Step 3, field programmable gate array carry out quadruple by the phase-locked loop pll carrying to clock reference, change 50MHz input clock signal into 200MHz work reference signal.
Step 4, the m sequence pseudo random code stream of field programmable gate array taking 200MSPS speed generation progression as 20 grades.
Step 5, employing " limited intercepting source sequence " method, each clock cycle intercepts 14 from 20 described m sequence pseudo random codes according to certain rule and carries out digital-to-analogue conversion.
Step 6, carry out feedback shift operation, adopt and carry out in a like fashion code fetch conversion in next m Sequence pseudo stochastic regime.
Beneficial effect of the present invention:
Compared with prior art, adopt field programmable gate array of the present invention to produce m sequence pseudo random code stream, be converted to analog signal through digital to analog converter A, then by low pass filter filtering high fdrequency component, output white Gaussian noise signal after finally amplifying by amplifier Y; Meanwhile, field programmable gate array exports to control the reference level of digital to analog converter A by the simulation of described adjusting digital to analog converter B, thereby it is adjustable to realize white Gaussian noise signal amplitude; It is 0V that amplifier Z6 makes the output center voltage of digital to analog converter A2, taking the amplitude equalizing value of guaranteeing white Gaussian noise signal as zero." the limited intercepting source sequence " method of utilization, has increased the length of pseudo random sequence, has simple in structure and realizes advantage easily.Meet the demand of different occasions, expand its application, when having solved the existing m of utilization sequence and having realized white Gaussian noise signal, in order to increase the white Gaussian noise signal period, need to increase m sequence pseudo random code stream length, increase m sequence progression, thereby increase hardware spending, cause complex structure and other problems.
Brief description of the drawings
Fig. 1 is principle of the invention block diagram;
Fig. 2 is the time domain specification figure of the white Gaussian noise signal that produces of the present invention of viewing by oscilloscope;
Fig. 3 is that the present invention who views by signal analyzer produces the flatness performance plot of white Gaussian noise signal on frequency domain.
Embodiment
A kind of 10MHz band noise signal generation device, it comprises (see figure 1): field programmable gate array 1 and digital to analog converter A2, field programmable gate array 1 is connected by wire with digital to analog converter A2, digital to analog converter A2 is connected by wire with low pass filter 3, and low pass filter 3 is connected by wire with amplifier Y4.
Field programmable gate array 1 is connected by wire with digital to analog converter B5, digital to analog converter B5 is connected by wire with digital to analog converter A2, regulate the simulation of digital to analog converter B5 to export to control the reference level of digital to analog converter A2, thereby it is adjustable to realize white Gaussian noise signal amplitude.
Digital to analog converter A2 output is connected by wire with amplifier Z6 input, and amplifier Z6 output is connected by wire with digital to analog converter A2 input.It is 0V that amplifier Z6 makes the output center voltage of digital to analog converter A2, taking the amplitude equalizing value of guaranteeing white Gaussian noise signal as zero.
The noise signal production method of 10MHz band noise signal generation device, it comprises following step:
Step 1, field programmable gate array 1 export to control the reference level of digital to analog converter A2 by the simulation that regulates digital to analog converter B5, thereby it is adjustable to realize white Gaussian noise signal amplitude;
Step 2, by adjusting amplifier Z6, to make the output center voltage of digital to analog converter A2 be 0V, taking the amplitude equalizing value that realizes white Gaussian noise signal as zero;
Step 3, field programmable gate array 1 carry out quadruple by the phase-locked loop carrying to clock reference, change 50MHz input clock signal into 200MHz work reference signal;
Step 4, the m sequence pseudo random code stream of field programmable gate array 1 taking 200MSPS speed generation progression as 20 grades;
Step 5, employing " limited intercepting source sequence " method, each clock cycle intercepts 14 from 20 described m sequence pseudo random codes according to certain rule and carries out digital-to-analogue conversion;
Step 6, carry out feedback shift operation, adopt and carry out in a like fashion code fetch conversion in next m Sequence pseudo stochastic regime.
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As Fig. 1, field programmable gate array 1 produces m sequence pseudo random code stream, is converted to analog signal through digital to analog converter A2, then by low pass filter 3 filtering high fdrequency components, and output white Gaussian noise signal after finally amplifying by amplifier Y4; Meanwhile, field programmable gate array 1 exports to control the reference level of digital to analog converter A2 by the simulation of described adjusting digital to analog converter B5, thereby it is adjustable to realize white Gaussian noise signal amplitude; It is 0V that amplifier Z6 makes the output center voltage of digital to analog converter A2, taking the amplitude equalizing value of guaranteeing white Gaussian noise signal as zero.
Field programmable gate array 1 carries out quadruple by the PLL carrying to clock reference, changes 50MHz input clock signal into 200MHz work reference signal.Field programmable gate array 1 produces progression as the m sequence pseudo random code of 20 grades flows taking 200MSPS speed, adopts " limited intercepting source sequence " method, intercepts 14 at every turn carry out digital-to-analogue conversion from 20 described m sequence pseudo random codes according to certain rule.Specific practice is, in a certain m Sequence pseudo stochastic regime, first to get the 1st of m sequence pseudo random code stream and carry out digital-to-analogue conversion to the 14th in the time of the 1st time, in the time of the 2nd time, get the 2nd and carry out digital-to-analogue conversion to the 15th,, agreement according to this, until the 7th time time, get the 7th and carry out digital-to-analogue conversion to the 20th, now, whole 20 m sequence pseudo random codes stream has all been got time, then, carry out feedback shift operation, adopt and carry out in a like fashion code fetch conversion in next m Sequence pseudo stochastic regime.
In the present invention, the progression n=20 of m sequence, sequence length m=2
n-1=1048575, tables look-up, and selecting feedback factor is 4001 151(octal system).Get all over all possible m sequence initial value when 10MHz band noise signal generation device, have 2
21-1=2097151 organizes initial value.For every group of definite initial value, m sequence length is 1048575, under each state of determining initial value at one group,
A. adopt conventional method, each clock cycle gets 20 from 20 m sequence codes and carries out digital-to-analogue conversion, and within first clock cycle an initialize, need 1048575+1=1048576 clock cycle therefore complete the feedback shift output function of one group of initial value.Now, the cycle of white Gaussian noise signal is (1048576 × 2097151) × [1/(200MHz)]=10995.1s=3.1h, and 10MHz band noise signal generation device can not produce the signal of repetition in the about 3.1h of continuous operation, there is no the cycle.
B. adopt " limited intercepting source sequence " method, each clock cycle gets 14 from 20 m sequence codes and carries out digital-to-analogue conversion, and an initialize within first clock cycle, needs 1048575 × 7+1=7340026 clock cycle therefore complete the feedback shift output function of one group of initial value.Now, the cycle of white Gaussian noise signal is (7340026 × 2097151) × [1/(200MHz)]=76965.7s=21.4h, and 10MHz band noise signal generation device can not produce the signal of repetition in the about 21.4h of continuous operation, there is no the cycle.
Contrast above-mentioned two kinds of methods, b adopts " limited intercepting source sequence " method, without the extra hardware spending that increases, can increase m sequence length, increases the white Gaussian noise signal period, and simple in structure, it is convenient to realize, and meets general instructions for use.
Digital to analog converter B5 selects the AD7302 of ADI company.AD7302 is the digital to analog converter of 8, for controlling the reference level of digital to analog converter A2.The REFIN pin of AD7302 is connected to power supply input pin VDD=3.3V herein, adopts internal reference mode to provide reference level to AD7302, now, the reference level V of AD7302
rEF_B=V
dD/ 2=1.65V.Due to the reference level V of AD9744
oUT_Binput range is (0.1 ~ 1.25) V, according to formula in AD7302 databook, sees formula (1), can calculate N
bspan is about (8 ~ 97), converts 8 bit values to for (0,000 1000 ~ 0,110 0001).By setting different N
bvalue, can change the simulation output of digital to analog converter B5, thereby controls the reference level of digital to analog converter A2, realizes white Gaussian noise signal amplitude adjustable.
V
OUT_B=2×V
REF_B（N
B/256） （1）
Low pass filter 3 selects 20MHz low pass filter.
In the present embodiment, utilize oscilloscope can check the time domain specification of white Gaussian noise signal, as signal shape, amplitude etc., base knob when adjusting, in the time that time shaft is 5ms/div, obtains result as shown in Figure 2; Utilize signal source analyzer can watch the characteristics such as the flatness of white Gaussian noise signal on frequency domain, centre frequency is set to 10MHz, and bandwidth is set to 20MHz, and result as shown in Figure 3.
Adopt apparatus of the present invention, utilize " limited intercepting source sequence " method, increased the length of pseudo random sequence, have simple in structure and realize advantage easily.Meet the demand of different occasions, expand its application, when having solved the existing m of utilization sequence and having realized white Gaussian noise signal, in order to increase the white Gaussian noise signal period, need to increase m sequence pseudo random code stream length, increase m sequence progression, thereby increase hardware spending, cause complex structure and other problems.
Claims (2)
1. a 10MHz band noise signal generation device, it comprises: field programmable gate array (1) and digital to analog converter A(2), field programmable gate array (1) and digital to analog converter A(2) be connected by wire, digital to analog converter A(2) be connected low pass filter (3) and amplifier Y(4 by wire with low pass filter (3)) be connected by wire; Digital to analog converter A(2) output and amplifier Z(6) input is connected by wire, amplifier Z(6) output and digital to analog converter A(2) input is connected by wire; It is characterized in that: field programmable gate array (1) and digital to analog converter B(5) be connected digital to analog converter B(5 by wire) with digital to analog converter A(2) be connected by wire.
2. a noise signal production method for 10MHz band noise signal generation device as claimed in claim 1, it comprises following step:
Step 1, field programmable gate array (1) are by regulating digital to analog converter B(5) simulation export to control digital to analog converter A(2) reference level, thereby it is adjustable to realize white Gaussian noise signal amplitude;
Step 2, by adjusting amplifier Z(6) make digital to analog converter A(2) output center voltage be 0V, taking the amplitude equalizing value that realizes white Gaussian noise signal as zero;
Step 3, field programmable gate array (1) carry out quadruple by the phase-locked loop carrying to clock reference, change 50MHz input clock signal into 200MHz work reference signal;
Step 4, the m sequence pseudo random code stream of field programmable gate array (1) taking 200MSPS speed generation progression as 20 grades;
Step 5, employing " limited intercepting source sequence " method, each clock cycle intercepts 14 from 20 described m sequence pseudo random codes according to certain rule and carries out digital-to-analogue conversion;
Step 6, carry out feedback shift operation, adopt and carry out in a like fashion code fetch conversion in next m Sequence pseudo stochastic regime.
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| CN101610066A (en) * | 2009-07-20 | 2009-12-23 | 北京交通大学 | A kind of white noise amplitude compensation method |
| CN101807880A (en) * | 2009-12-17 | 2010-08-18 | 北京交通大学 | Gaussian white noise generator and implement method thereof |
| CN202309616U (en) * | 2011-11-16 | 2012-07-04 | 贵州航天计量测试技术研究所 | Noise signal generating device for 10MHz bandwidth |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610066A (en) * | 2009-07-20 | 2009-12-23 | 北京交通大学 | A kind of white noise amplitude compensation method |
| CN101807880A (en) * | 2009-12-17 | 2010-08-18 | 北京交通大学 | Gaussian white noise generator and implement method thereof |
| CN202309616U (en) * | 2011-11-16 | 2012-07-04 | 贵州航天计量测试技术研究所 | Noise signal generating device for 10MHz bandwidth |
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| 申艳，王新民，陈后金.基于FPGA的高斯白噪声发生器设计.《现代电子技术》.2009,(第23期), * |
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