CN1256831C - Programmable high-frequency pulse signal generator - Google Patents
Programmable high-frequency pulse signal generator Download PDFInfo
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- CN1256831C CN1256831C CN 200410018162 CN200410018162A CN1256831C CN 1256831 C CN1256831 C CN 1256831C CN 200410018162 CN200410018162 CN 200410018162 CN 200410018162 A CN200410018162 A CN 200410018162A CN 1256831 C CN1256831 C CN 1256831C
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Abstract
A programmable high frequency pulse signal generator, the generator comprising: the computer is connected with the DSK board through a parallel port on the DSK board, data input ends of a main signal D/A conversion chip and a reference signal D/A conversion chip are connected with an upper daughter board slot of the DSK board, an input end of a main power amplifier is connected with an output end of the main signal D/A conversion chip, and an output end of the main power amplifier is connected with a main output end; the input of the reference power amplifier is connected with the output of the reference signal D/A conversion chip, and the output of the reference power amplifier is connected with the reference output end. The invention has the characteristics of simple structure, easy upgrading and expansion, capability of generating high-frequency signals, periodic signals and arbitrary waveform signals and capability of providing multi-path synchronous output.
Description
Technical field:
The present invention relates to signal generator, particularly a kind of programmable high-frequency pulse signal generator.
Background technology:
Signal generator has a wide range of applications in various laboratory apparatuss that need signal input and system.Specifically, different output signals has unique separately application, and is irreplaceable.The signal generator that the reference signal output of strict synchronism is for example arranged, in the small light spot measuring system necessary (" measuring the method for large-numerical aperture optical system small light spot ", Xu Wendong, do the good fortune dawn, Chinese laser, 2003, the 30th volume, the 2nd phase, the 171-174 page or leaf), main output signal connects acousto-optic modulator as modulation signal, and its output amplitude can be regulated, connect lock-in amplifier with the reference signal of its strict synchronism so that demodulation, the reference signal output amplitude should not change with the variation of main amplitude output signal; The function signal generator of signals such as exportable square wave, pulse train, sawtooth waveforms, sine wave is used for applying the waveform of ideal to verify its performance to the circuit of design; Arbitrary waveform signal generator then can be used for factors such as extra pulse, spike, damping transition, frequency discontinuity the issuable devastating consequence of circuit is detected, and this is even more important to being applied to space flight, military affairs, railway and the circuit certain situation more complicated, key areas.
Technology Any Digit signal generator able to programme (utility model patent formerly, application number: 93207151.1), as shown in Figure 1: device is a core with 8031 single-chip microcomputers, comprises keyboard and display 01, clock circuit 03, external trigger input circuit 04, waveform data memory 05, waveform length controller 06, frequency synthesizer 07, address generator 08 and D/A converter 09.During work, 8031 single-chip microcomputers calculate the data of random waveform and write the waveform data memory 5 of Fig. 1, read or directly from waveform data memory readout interval Wave data, realize the output programmable signal by the D/A translation circuit at last.Though it has the programme controlled advantage of deciding good reproducibility and can realize frequency of putting of output frequency resolution rate height, frequency, still comes with some shortcomings:
1) complex structure, the peripheral circuit integrated level is not high, and difficulty is expanded in upgrading;
2) data addressing of 8031 single-chip microcomputers is limited in scope, and the table capacity is not high; The data/address bus figure place is low, and output signal accuracy is low; Instruction cycle is short inadequately, and operand speed is slow; Bus structures are unfavorable for data processing, and instruction efficient is poor, have very big difficulty aspect the generation high-frequency signal;
3) there are not the same waveform as that the output signal strict synchronism can be provided or certain fixed delay time is arranged or the synchronous output end of different wave reference signal;
4) D/A change-over circuit back does not have power amplification and low-impedance output circuit, is not easy to directly connect load.
Summary of the invention:
The problem to be solved in the present invention is to overcome the deficiency of above-mentioned technology formerly, a kind of programmable high-frequency pulse signal generator is provided, and it should have simple in structure, is easy to the extended function of upgrading, can produce high-frequency signal, periodic signal, random waveform signal, the multichannel characteristics of output synchronously can be provided.
Basic thought of the present invention is:
1) adopt the ABC of external member DSK plate of DSP, high-speed d/a transducer and low output impedance power amplification circuit to constitute signal generator.Remove D/A converter in the integrated technology formerly on the DSK plate, all peripheral circuits or function that 8031 single-chip microcomputers are outer, and have a daughter board expansion slot.We become a daughter board to high-speed d/a transducer and low output impedance power amplification circuit partial design, are connected on the daughter board expansion slot.Simple in structure, extended function only need be changed daughter board or expand daughter board.
2) the DSP digital signal processing chip on the DSK plate replaces 8031 single-chip microcomputers in the technology formerly, and by comparison, DSP digital signal processing chip data addressing range is big; 16 or 32 bit data width, the output signal accuracy height; Instruction cycle is short; Data and instruction separate storage, pile line operation, have special-purpose hardware multiplier and special instruction set, instruction efficient height, 16 or 32-bit number signal that the energy generation time is very short at interval, have great advantage at tool aspect the generation high-frequency high-precision signal, be more suitable for realizing the programmable high-frequency pulse signal generator.
3) 16 of the two-way high-speed d/a transducer on daughter board conversions or 32 s' discrete digital signal, and with the write signal control high-speed d/a transducer of dsp chip realize between multiple signals synchronously or delay;
4) the low output impedance power amplification circuit is realized the power amplification and the low-resistance output of signal, conveniently connects load.
Technical solution of the present invention is as follows:
A kind of programmable high-frequency pulse signal generator, the formation of this generator is: computer links to each other with the DSK plate by the parallel port on the DSK plate, the data input pin of main signal D/A conversion chip and reference signal D/A conversion chip links to each other with daughter board groove on the DSK plate, the input of main power amplifier is connected with the output of main signal D/A conversion chip, and output is connected with main output; The output of the input of reference power amplifier and reference signal D/A conversion chip is connected, exports and is connected with reference to output.
Described main signal D/A conversion chip, main power amplifier, main output and reference signal D/A conversion chip, reference power amplifier and integrate the formation daughter board with reference to output link to each other with daughter board groove on the DSK plate.
Compare advantage of the present invention with technology formerly:
(1) adopt the DSK plate to do the generation part of discrete digital signal, do not need to design peripheral interface circuit voluntarily to dsp chip, the DSK plate has comprised dsp chip, external random access memory (SRAM), flash memory (FLASH), emulation interface, with the parallel port and the daughter board interface of upper machine communication, can conveniently debug, host computer control also can independent operating and daughter board expand that (D/A converter and power amplification circuit can be made daughter board and be inserted on the daughter board groove, because the batch process of DSK plate, its price is very low, helps reducing the cost of apparatus of the present invention.
(2) but since internal processes set by emulation interface debugging after independent operating, also can carry out real-time communication with computer, programmable high-frequency pulse signal generator of the present invention can produce output amplitude and pulse duration can computer-controlled pulse, output amplitude, pulse duration and time of delay can computer-controlled continuous impulses, the random waveform of other waveform that digital signal processor (DSP) generates and host computer storage, and can provide with its strict synchronism simultaneously or the same waveform as of certain fixed delay time is arranged or the reference signal of different wave, the amplitude of reference signal, time of delay and waveform are also controlled fully by computer.
(3) high-speed d/a transducer and low output impedance power amplification circuit can be done together, are inserted on the daughter board groove on the DSK plate as daughter board, and assembling is simple, also helps from now on maintenance, upgrading and renewal.In a word, compare with simple high frequency signal generator, cheap, powerful.
Description of drawings:
Fig. 1: be the principle schematic of technology Any Digit signal generator able to programme formerly.
Fig. 2: for the present invention is based on the principle schematic of DSP digital signal processor.
Fig. 3: be the structure chart of D/A converter spare in the embodiment of the present invention.
Fig. 4: be several forms of output signal in the embodiment of the present invention.
Embodiment:
The embodiment block diagram of programmable high-frequency pulse signal generator of the present invention as shown in Figure 2, as seen from the figure, the formation of programmable high-frequency pulse signal generator of the present invention is: computer 11 links to each other with DSK plate 12 by the parallel port 1201 on the DSK plate 12, the data input pin of main signal D/A conversion chip 13 and reference signal D/A conversion chip 18 links to each other with daughter board groove 1202 on the DSK plate 12, the input of main power amplifier 14 is connected with 13 outputs of main signal D/A conversion chip, and output is connected with main output 15; 18 outputs of the input of reference power amplifier 17 and reference signal D/A conversion chip are connected, export and are connected with reference to output 16.
The DSK development board 2 that present embodiment discrete digital signal generation divides adopts the TMS320VC5402 DSK development board of TI companies, and it is daughter board groove 1202 and the equipment such as parallel port 1201 that link to each other with main frame that FLASH memory, the jtag test bus control unit of external SRAM, the 56K of digital signal processor DSP chip, the 64K of the instruction cycle 10ns of 16 of outputs, the interface of expansion daughter board are arranged on this piece DSK development board.DSP digital signal processor on the DSK plate can have multiple different bootmode, to adapt to the different occasions that DSK uses.For example use the JTAG debugger to realize the default mode of emulation; HPI when the software of main frame or driver will load internal memory via the parallel port (host port interface) pattern; The pattern of using 8,16,32 ROM or FLASH memory to guide DSK, but DSK development board independent operating under this pattern need not connect host computer.General in the actual design with back two kinds of bootmodes, the third pattern, program is burned FLASH, both can make DSK development board independent operating, and the program that can guarantee again is difficult to be used by others, and the present invention is an expanded application, adopts second kind of bootmode in an embodiment.The two-way D/A conversion chip of digital-to-analogue conversion part---main signal D/A conversion chip 13 and reference signal D/A conversion chip 18 adopt AD9732, and AD9732 is ten a high-speed digital-analog conversion chip, and be 5ns change-over time, and a data latch is arranged.Latching of the rising edge trigger data of latch signal Clock given the D/A switching network and produced analog signal output.Chip structure such as Fig. 3.
Signal generator constitutes as Fig. 2, computer 11 and DSK development board 12 are by parallel port 1201 communications, the program that produces random waveform is handled back output discrete digital signal by dsp chip, 16 output line separately, Gao Shiwei gives main signal D/A conversion chip 13, gives reference signal D/A conversion chip 18 for low 6.When noticing that 6 position datawires connect 10 D/A converters, the D/A converter least-significant byte is divided into four strands in twos, add high two totally 6 strands connect 6 input data or 6 position datawires directly connect the high 6 of 10 D/A converters.The data latches of two D/A conversion chips distributes same address, with the write signal W of dsp chip by the non-Clock pin of supplying with two-way D/A conversion chip behind the door.During DSP output discrete digital signal, the Clock pin has the rising edge signal, and rising edge is latched in digital signal in the data latches of each D/A chip simultaneously, then conversion output synchronous analog signal.Can export the pulse of 30ns, the continuous impulse and the square wave of high frequency with the DSP5402 data processor of instruction cycle 10ns and the high-speed d/a conversion chip formation signal generator of instruction 5ns.Perhaps adopt the development board DSK of 32 shorter floating type DSP of instruction cycle, export 32 bit data and can satisfy 10 AD9732 chips of two-way, the precision of comparing every road D/A converter like this with precedent can be guaranteed.
Connect power amplifier behind the D/A converter---main power amplifier 14 and reference power amplifier 17, realize power amplification and impedance conversion function, high input impedance is become the low output impedance of 50 ohm or 75 ohm, conveniently connect load.
Fig. 4 is the signal that programmable high-frequency pulse signal generator of the present invention produces in the quiet dynamic test system of optical disk materials medium.As shown in the figure:
Static a writes, wipes status signal, and signal generator sends amplitude and the adjustable pulse of pulsewidth is given acousto-optic modulator, and laser is got ready on test material by acousto-optic modulator, finishes and writes, wipes operation.
Static b1 exports to the acousto-optic debugger by signal generator to be used for debugging laser, and b2 is the synchronizing signal of b1, all is input to demodulator at last, and b2 is as the reference signal of b1 demodulation.Dynamically a1 is the same with static b1 effect, but dynamic a2 and b2 are the signals that signal generator offers sweep unit, and this is that static test does not have, and dynamically b1 is that signal generator offers the signal that acousto-optic modulator is used for doing read operation.These signals are because be periodic signal, so Wave data is to write in the FLASH on the DSK plate, computer directly input to require the waveform of output signal and parameter control dsp chip to read these Wave datas just passable.
Claims (2)
1, a kind of programmable high-frequency pulse signal generator, the formation that it is characterized in that this generator is: computer (11) links to each other with DSK plate (12) by the parallel port (1201) on the DSK plate (12), the data input pin of main signal D/A conversion chip (13) and reference signal D/A conversion chip (18) is gone up daughter board groove (1202) with DSK plate (12) and is linked to each other, the input of main power amplifier (14) is connected with main signal D/A conversion chip (13) output, and output is connected with main output (15); The output of the input of reference power amplifier (17) and reference signal D/A conversion chip (18) is connected, exports and is connected with reference to output (16).
2, programmable high-frequency pulse signal generator according to claim 1, it is characterized in that described main signal D/A conversion chip (13), main power amplifier (14), main output (15) and reference signal D/A conversion chip (18), reference power amplifier (17) and integrate the formation daughter board, go up daughter board groove (1202) with DSK plate (12) and link to each other with reference to output (16).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410018162 CN1256831C (en) | 2004-05-09 | 2004-05-09 | Programmable high-frequency pulse signal generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410018162 CN1256831C (en) | 2004-05-09 | 2004-05-09 | Programmable high-frequency pulse signal generator |
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| CN1570652A CN1570652A (en) | 2005-01-26 |
| CN1256831C true CN1256831C (en) | 2006-05-17 |
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| CN 200410018162 Expired - Fee Related CN1256831C (en) | 2004-05-09 | 2004-05-09 | Programmable high-frequency pulse signal generator |
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Owner name: SHANGHAI OPTICS AND PRECISION MECHANICS INSTITUTE Free format text: FORMER OWNER: SHANGHAI OPTICS AND PRECISION MECHANICS INSTITUTE, CHINESE ACADEMY OF SCIENCES Effective date: 20080912 |
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Effective date of registration: 20080912 Address after: Shanghai 800-211 post office mailbox: 201800 Co-patentee after: SHANGHAI LASER POWER EQUIPMENT CO., LTD. Patentee after: Shanghai Institute of Optics and Fine Mechanics.CAS, Chinese Academy of Sciences Address before: Shanghai 800-211 post office mailbox: 201800 Patentee before: Shanghai Optical Precision Machinery Inst., Chinese Academy of Sciences |
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