CN202443042U - Multi-mode modulating signal generator - Google Patents
Multi-mode modulating signal generator Download PDFInfo
- Publication number
- CN202443042U CN202443042U CN2012200471491U CN201220047149U CN202443042U CN 202443042 U CN202443042 U CN 202443042U CN 2012200471491 U CN2012200471491 U CN 2012200471491U CN 201220047149 U CN201220047149 U CN 201220047149U CN 202443042 U CN202443042 U CN 202443042U
- Authority
- CN
- China
- Prior art keywords
- synthesis unit
- dds
- frequency
- signal generator
- frequency synthesis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The utility model relates to the technical field of electrical measurement, in particular to a multi-mode modulating signal generator. The multi-mode modulating signal generator comprises a complex programmable logic device (CPLD) control unit, a FLASH storage unit, a digital dynamics simulator (DDS) digital frequency synthesis unit and a phase locking frequency synthesis unit connected with the output end of the DDS digital frequency synthesis unit. The output end of the CPLD control unit is connected with the input end of the DDS digital frequency synthesis unit, the input-output end of the CPLD control unit is connected with the input end of the FLASH storage unit, and the output end of the FLASH storage unit is connected with the input end of the DDS digital frequency synthesis unit. A DDS chip and a phase locking loop (PLL) chip are adopted to form a combined frequency synthesizer. Frequency waveforms with wide broadband, low noise, low stray, high-purity frequency spectrum and various modulation modes can be obtained by utilizing the multi-mode modulating signal generator, and signals in different modes can be quickly switched.
Description
Technical field
The utility model relates to electronic measuring technology field, relates in particular to a kind of multimode modulation signal generator.
Background technology
Modern testing apparatus integrated level is increasingly high, and the function that needs to accomplish is also in continuous enhancing, and the radiofrequency signal that therefore modern testing apparatus needs to simulate output unlike signal form is to satisfy different testing requirements.The method of the frequency synthesis of being adopted at present, mainly contains three kinds of direct frequency synthesis, frequency of phase locking synthetic (PLL) and Direct Digital frequency synthesis (DDS).The frequency of phase locking synthetic method is put frequency time length, resolution is lower; Low, the spuious output of Direct Digital frequency combining method output frequency is abundant.Present stage mainly concentrates on the research to frequency form for the research that signal produces form; Comprise frequency hopping, spread-spectrum signal etc.; But can not satisfy the requirement of the test signal of the different modulating pattern that realizes that different test functions are required, therefore pressing for a kind of new technical scheme of proposition can solve the problems of the technologies described above.
Summary of the invention
For addressing the above problem, the utility model provide a kind of low noise, low spuious, have a multimode modulation signal generator that multiple modulating mode and different modulating pattern can be switched each other.
The technical scheme that the utility model adopts is following: a kind of multimode modulation signal generator; Comprise CPLD control module, FLASH storage unit and DDS numerical frequency synthesis unit; CPLD control module output terminal is connected with DDS numerical frequency synthesis unit input end; Its input/output terminal is connected with FLASH storage unit input end; FLASH storage unit output terminal is connected with DDS numerical frequency synthesis unit input end, also comprises the frequency of phase locking synthesis unit that is connected with DDS numerical frequency synthesis unit output terminal.This generator outside is provided with keyboard and display screen; The CPLD control module is the overall control module of generator, and the outside is connected with computing machine with keyboard, is used for the input of response external keyboard and the data of receiving computer; Be connected with DDS numerical frequency synthesis unit in the system; DDS numerical frequency synthesis unit is controlled, also be connected simultaneously with the FLASH storage unit, can be fast to storage unit input signal control word address; Storage unit is exported corresponding data to DDS numerical frequency synthesis unit after receiving the address, is produced the signal of multiple modulating mode by DDS.The signal that produces through the frequency of phase locking synthesis unit, utilizes its narrow-band tracking characteristic and filter function again, fully suppresses spurious signal, produces low noise, low spuious and have a signal of multiple modulating mode.
Said apparatus also comprises a power module and clock module, is connected with the frequency of phase locking synthesis unit with CPLD control module, DDS numerical frequency synthesis unit respectively, is used to its power supply and external clock is provided.
Described CPLD control module comprises a CPLD chip and connected external clock input filter circuit, program download circuit and power supply input filter circuit.The program download circuit is used for being connected with computing machine, realizes the exchanges data with computing machine.
Described DDS numerical frequency synthesis unit comprises a DDS chip and connected external clock input filter circuit and power supply input filter circuit.The DDS chip is as generator module, and the signal that main realization receives after the control word data takes place.
Described frequency of phase locking synthesis unit comprises a PLL frequency of phase locking synthesis chip and connected external clock input filter circuit, power supply input filter circuit and wave filter; The signal of frequency of phase locking synthesis chip output is output again behind filter filtering, can effectively eliminate spurious signal.
The utility model adopts DDS chip and PLL chip to constitute the combined type frequency synthesizer; Both had phase-locked loop narrow-band tracking characteristic; Can overcome the defective of spuious many, the narrow bandwidth of DDS again; Solve the low problem of phaselocked loop formula frequency synthesizer resolution, and have the low and characteristic of simple structure of cost.Utilize the utility model can obtain wide bandwidth, low noise, low spuious, high pure frequency spectrum, have the frequency waveform of multiple modulating mode, and can realize quick switching between the signal of different mode.
Description of drawings
Be described in detail below in conjunction with the embodiment of accompanying drawing the utility model:
Fig. 1 is the system chart of the utility model;
Fig. 2 is the composition structural drawing of CPLD control module;
Fig. 3 is the composition structural drawing of DDS numerical frequency synthesis unit;
Fig. 4 is the composition structural drawing of frequency of phase locking synthesis unit;
Among the figure, 1, the CPLD control module, 11, the CPLD chip, 12, the program download circuit; 13, external clock input filter circuit, 14, the power supply input filter circuit, 2, the FLASH storage unit, 3, DDS numerical frequency synthesis unit; 31, DDS chip, 32, the external clock input filter circuit, 33, the power supply input filter circuit, 4, the frequency of phase locking synthesis unit; 41, PLL frequency of phase locking synthesis chip, 42, the external clock input filter circuit, 43, the power supply input filter circuit; 44, wave filter, 5, clock module, 6, power module.
Embodiment
A kind of multimode modulation signal generator; As shown in the figure; Comprise power module 6, clock module 5, CPLD control module 1, DDS numerical frequency synthesis unit 3, FLASH storage unit 2 and frequency of phase locking synthesis unit 4; Power module 6 is connected with CPLD control module 1, DDS numerical frequency synthesis unit 3, frequency of phase locking synthesis unit 4 respectively with clock module 5, for these module for power supply with external clock is provided.CPLD control module 1 output terminal is connected with DDS numerical frequency synthesis unit 3 input ends, is used to control this unit.CPLD control module 1 input/output terminal is connected with FLASH storage unit 2 input ends; To storage unit Input Control Word address; FLASH storage unit 2 output terminals are connected with DDS numerical frequency synthesis unit 3 input ends, export corresponding data according to the control word address to DDS.DDS numerical frequency synthesis unit 3 output terminals are connected with frequency of phase locking synthesis unit 4 input ends, the multimode modulation signal of output is imported the frequency of phase locking synthesis unit carry out Filtering Processing, suppress spurious signal.
Described CPLD control module 1 comprises EPM7128STC100-10 type CPLD chip 11 and connected external clock input filter circuit 13, program download circuit 12 and a power supply input filter circuit 14.The program download circuit is used for being connected with computing machine, realizes the exchanges data with computing machine.Described DDS numerical frequency synthesis unit 3 comprises an AD9858 type DDS chip 31 and connected external clock input filter circuit 32 and power supply input filter circuit 33.The DDS chip is as generator module, and the signal that main realization receives after the control word data takes place.The FLASH storage unit is made up of SST39VF400A FLASH chip, and this chip is connected respectively to CPLD chip and DDS chip.Described frequency of phase locking synthesis unit 4 comprises STW81102 type PLL frequency of phase locking synthesis chip 41 and connected external clock input filter circuit 42, power supply input filter circuit 43 and a wave filter 44; Wave filter 44 is connected with the output terminal of PLL frequency of phase locking synthesis chip 41, and the output signal is carried out Filtering Processing.
Claims (5)
1. multimode modulation signal generator; Comprise CPLD control module, FLASH storage unit and DDS numerical frequency synthesis unit; CPLD control module output terminal is connected with DDS numerical frequency synthesis unit input end; Its input/output terminal is connected with FLASH storage unit input end, and FLASH storage unit output terminal is connected with DDS numerical frequency synthesis unit input end, it is characterized in that: also comprise the frequency of phase locking synthesis unit that is connected with DDS numerical frequency synthesis unit output terminal.
2. multimode modulation signal generator according to claim 1; It is characterized in that: also comprise a power module and clock module; Be connected with the frequency of phase locking synthesis unit with CPLD control module, DDS numerical frequency synthesis unit respectively, be used to its power supply and external clock is provided.
3. multimode modulation signal generator according to claim 1 and 2 is characterized in that: described CPLD control module comprises a CPLD chip and connected external clock input filter circuit, program download circuit and power supply input filter circuit.
4. multimode modulation signal generator according to claim 1 and 2 is characterized in that: described DDS numerical frequency synthesis unit comprises a DDS chip and connected external clock input filter circuit and power supply input filter circuit.
5. multimode modulation signal generator according to claim 1 and 2 is characterized in that: described frequency of phase locking synthesis unit comprises a PLL frequency of phase locking synthesis chip and connected external clock input filter circuit, power supply input filter circuit and wave filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200471491U CN202443042U (en) | 2012-02-14 | 2012-02-14 | Multi-mode modulating signal generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200471491U CN202443042U (en) | 2012-02-14 | 2012-02-14 | Multi-mode modulating signal generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202443042U true CN202443042U (en) | 2012-09-19 |
Family
ID=46824486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200471491U Expired - Fee Related CN202443042U (en) | 2012-02-14 | 2012-02-14 | Multi-mode modulating signal generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202443042U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764913A (en) * | 2015-04-23 | 2015-07-08 | 北京出入境检验检疫局检验检疫技术中心 | Modulation reference source used for comparing specific absorption rate of wireless equipment with radiation performance test |
-
2012
- 2012-02-14 CN CN2012200471491U patent/CN202443042U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764913A (en) * | 2015-04-23 | 2015-07-08 | 北京出入境检验检疫局检验检疫技术中心 | Modulation reference source used for comparing specific absorption rate of wireless equipment with radiation performance test |
| CN104764913B (en) * | 2015-04-23 | 2017-06-23 | 北京出入境检验检疫局检验检疫技术中心 | Wireless device specific absorption rate and radiance test are compared with modulation reference source |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8406271B2 (en) | Spread spectrum clock generating circuit | |
| CN104237905B (en) | Big Dipper detector | |
| CN102354256A (en) | Multi-channel synchronizing signal generator based on field program gate array (FPGA) and AD9959 | |
| CN110113275A (en) | A kind of intelligence multichannel wideband interferer signal generation device | |
| CN105388805B (en) | Measurement and Control System based on spi bus | |
| CN202929519U (en) | Multichannel phase adjustable signal generator | |
| CN114660435A (en) | FPGA-based testing device | |
| CN204462781U (en) | A kind of PLC Collaborative Control device based on EP1C6 | |
| CN105049035A (en) | Multi-mode small low phase noise broadband dot frequency synthetic circuit and method | |
| CN102495356B (en) | Processing method of reset port of scan chain asynchronous reset register | |
| CN203883807U (en) | Digital atomic frequency standard system circuit | |
| CN105702187B (en) | A kind of interface circuit, test device | |
| CN202443042U (en) | Multi-mode modulating signal generator | |
| CN206922765U (en) | Touch order vectors modulation signal generator | |
| CN204681338U (en) | A kind of clock generation circuit of digital signal processor | |
| CN106443093A (en) | Matrix switcher based testing instrument multiplexing device | |
| CN202975317U (en) | Reconstructed FPGA radar digital signal processing assembly | |
| CN205247119U (en) | Gradual signal real -time supervision device of low frequency | |
| CN105245235A (en) | Serial-to-parallel conversion circuit based on clock phase modulation | |
| CN104391817A (en) | Electronic system synchronous with peripheral equipment | |
| Li | Design and Implementation of DDS Signal Generator Based on FPGA | |
| CN103984263B (en) | A kind of compatible ISA, the general dsp module of pci bus interface and collocation method | |
| CN209017167U (en) | A kind of vision signal generating means | |
| CN206224290U (en) | A kind of high-resolution signal generator based on DDS | |
| CN213690296U (en) | Digital signal generator based on DDS technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120919 Termination date: 20130214 |