CN107547086A - A kind of digitized nuclear magnetic resonance frequency source device - Google Patents
A kind of digitized nuclear magnetic resonance frequency source device Download PDFInfo
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- CN107547086A CN107547086A CN201610465626.9A CN201610465626A CN107547086A CN 107547086 A CN107547086 A CN 107547086A CN 201610465626 A CN201610465626 A CN 201610465626A CN 107547086 A CN107547086 A CN 107547086A
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Abstract
The present invention relates to the apparatus of nuclear magnetic resonance, and in particular to a kind of digitized nuclear magnetic resonance frequency source device.It is characterized in that the device is made up of controller, DDS frequency generators, low pass filter, amplifier, phase discriminator, voltage controlled oscillator, frequency divider, man-machine terminal.Wherein, phase discriminator, voltage controlled oscillator, frequency divider constitute PLL circuit, and the device is combined mode using DDS with PLL.The present invention has the advantages that frequency error factor speed is fast, and spurious reduction performance is good, and frequency resolution is high, and cost is cheap.Particularly suitable for system integration application in magnetic nuclear resonance analyzer.
Description
Technical field
The present invention relates to the apparatus of nuclear magnetic resonance, and in particular to a kind of digitized nuclear magnetic resonance frequency source device.
Background technology
Frequency source is the critical component in nuclear magnetic resonance apparatus system, is the important component in nuclear magnetic resonance apparatus system, is mainly used in exciting the generation nuclear spin of sample to provide output local oscillation signal for nuclear magnetic resonance apparatus system.Nuclear magnetic resonance apparatus requires that frequency source possesses the technical indicators such as high stability, high spectrum degree of purity, high-frequency switch speed, high frequency resolution, low phase noise.
It is currently, there are following several frequency synthesis techniques：First, the frequency source technology based on analog synthesis.It, as the reference signal source of whole frequency source, required output signal is directly produced by approach such as the frequency multiplication of analog device, frequency dividing, mixing generally by the use of a crystal oscillator.The frequency source of PTS Inc. of the U.S. employs this technology.But frequency synthesis is realized as a result of more analog device, its is bulky, expensive, therefore, is not suitable for using in the spectrometer system of lower cost；Second, the frequency synthesis technique based on phaselocked loop.It generally utilizes a reference frequency source, by comparing the phase of voltage controlled oscillator and the phase difference of reference frequency source, driving adjustment voltage controlled oscillator, its output frequency is locked in a certain frequency.The advantages of this frequency combining method, is simple in construction, the frequency stabilization of output, and spurious reduction is good.Its shortcoming is that frequency error factor speed is slower, poor to the modulation capability of signal.3rd, direct digital frequency synthesis technology.It carries out frequency synthesis, using digital storage technique, has accurate phase, frequency resolution from the concept of phase.Quick phase, frequency, the switch speed of amplitude.With it is traditional based on the frequency source of analog frequency synthesis and phaselocked loop compared with, the frequency source based on DDS has the characteristics of design is simple, cheap.But direct digital synthesizers is spuious larger, output frequency is not high.
By taking China Patent No. CN200410099267.7 patent as an example, wherein disclosed universal digitized nuclear magnetic resonance frequency source directly exports nmr frequency based on direct digital synthesizers frequency technique.For the radio-frequency channel of nuclear magnetic resonance, including the waveform used on PC sets the parts such as software, single-chip microcomputer, field programmable gate array FPGA, Direct Digital Frequency Synthesizers part.Although the frequency source possesses phase, frequency, the quick switch speed of amplitude, spuious larger, phase noise is larger, and expensive.
The content of the invention
The defects of existing for existing nmr frequency source, it is proposed that a kind of frequency error factor speed is fast, and spurious reduction performance is good, and frequency resolution is high, the low digitized nuclear magnetic resonance frequency source device of cost.
Solving the measure that above-mentioned technical problem is taken is：A kind of digitized nuclear magnetic resonance frequency source device, it is characterised in that the device is made up of controller, DDS frequency generators, low pass filter, amplifier, phase discriminator, voltage controlled oscillator, frequency divider, man-machine terminal.Wherein, phase discriminator, voltage controlled oscillator, frequency divider constitute PLL circuit.
Local frequency information is exported and controls DDS frequency generators by IO to controller, controller by man-machine terminal by serial communication mode, produces fundamental frequency signal；Fundamental frequency signal passes through low pass filter, filters out high frequency harmonic components, subsequently into amplifier, as first via amplifier input signal；Phase discriminator, voltage controlled oscillator are entered by the first via signal of amplifier output；The signal of voltage controlled oscillator output is again introduced into amplifier by frequency divider, and as the second road amplifier input signal, the second tunnel input signal of amplifier is by being amplified into phase discriminator；The signal of voltage controlled oscillator output is again introduced into amplifier simultaneously, and as the 3rd road amplifier input signal, local oscillation signal is exported after amplification.
Controller is made up of single-chip microcomputer or ARM chips and its peripheral minimum system, serial communication chip, input-output system, ensures low cost, the high stability operation of device.Man-machine terminal can be with integrated man-machine interface.DDS frequency generators are made up of DDS chips and its peripheral circuit.Low pass filter is made up of 7 rank ellipse lowpass filter lc circuits.Amplifier, phase discriminator, voltage controlled oscillator, frequency divider are entirely integration module, ensure that the high stability and integration of system, reduce the cost of package unit.
Compared with prior art, because master control system uses single-chip microcomputer or ARM chips, the stability of single unit system gets a promotion the present invention, and cost is lower.Using the design of integrated modular, the high stability of system ensure that.The digitized nuclear magnetic resonance frequency source is combined using DDS modes with PLL modes, makes that the frequency error factor speed of the device is fast, and spurious reduction performance is good, and frequency resolution is high, and cost is cheaper.
Brief description of the drawings
Fig. 1 is structured flowchart of the present invention.
Embodiment
It is described with reference to the accompanying drawings the structure of patent of the present invention.
A kind of digitized nuclear magnetic resonance frequency source device, see Fig. 1, controller is using STM32F103RCT6 the integrated circuits serial ARM of ST Microelectronics, wherein the integrated circuit is communicated by serial mode and man-machine terminal, and man-machine terminal uses the DMT64480T035_01W of Beijing Di Wen companies.DDS frequency generators use AD9913 integrated circuits, the periphery circuit design of standard.Multichannel pmultiple amplifier uses MC10116, and phase discriminator uses AD9901 preferred circuit, and voltage controlled oscillator uses MC1648, and frequency divider uses MC10136.Wherein, phase discriminator AD9901, voltage controlled oscillator MC1648, frequency divider MC10136 form PLL circuit, and complete local oscillator output channel is formed with the DDS circuit of forward part.
Claims (2)
1. a kind of digitized nuclear magnetic resonance frequency source device, it is characterised in that the device is made up of controller, DDS frequency generators, low pass filter, amplifier, phase discriminator, voltage controlled oscillator, frequency divider, man-machine terminal；Local frequency information is exported and controls DDS frequency generators by IO to controller, controller by man-machine terminal by serial communication mode, produces fundamental frequency signal；Fundamental frequency signal passes through low pass filter, filters out high frequency harmonic components, subsequently into amplifier, as first via amplifier input signal；Phase discriminator, voltage controlled oscillator are entered by the first via signal of amplifier output；The signal of voltage controlled oscillator output is again introduced into amplifier by frequency divider, and as the second road amplifier input signal, the second tunnel input signal of amplifier is by being amplified into phase discriminator；The signal of voltage controlled oscillator output is again introduced into amplifier simultaneously, and as the 3rd road amplifier input signal, local oscillation signal is exported after amplification.
A kind of 2. digitized nuclear magnetic resonance frequency source device according to claim 1, it is characterised in that：Controller is communicated using STM32F103RCT6 the integrated circuits serial ARM of ST Microelectronics, the wherein integrated circuit by serial mode and man-machine terminal, and man-machine terminal uses the DMT64480T035_01W of Beijing Di Wen companies；DDS frequency generators use AD9913 integrated circuits, the periphery circuit design of standard；Multichannel pmultiple amplifier uses MC10116, and phase discriminator uses AD9901 preferred circuit, and voltage controlled oscillator uses MC1648, and frequency divider uses MC10136；Wherein, phase discriminator AD9901, voltage controlled oscillator MC1648, frequency divider MC10136 form PLL circuit, and complete local oscillator output channel is formed with the DDS circuit of forward part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610465626.9A CN107547086A (en) | 2016-06-24 | 2016-06-24 | A kind of digitized nuclear magnetic resonance frequency source device |
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| CN201610465626.9A CN107547086A (en) | 2016-06-24 | 2016-06-24 | A kind of digitized nuclear magnetic resonance frequency source device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632610A (en) * | 2004-12-29 | 2005-06-29 | 上海华鼎科技教育设备有限公司 | Universal digitized nuclear magnetic resonance frequency source |
| CN103178838A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Device and method for frequency synthesis of phase-locked loop or phase-locked ring |
| CN103762978A (en) * | 2014-01-20 | 2014-04-30 | 东南大学 | Broadband low-phase noise frequency synthesizer without frequency divider based on harmonic mixing |
| CN205754278U (en) * | 2016-06-24 | 2016-11-30 | 丹东东方测控技术股份有限公司 | A kind of digitized nuclear magnetic resonance frequency source device |
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2016
- 2016-06-24 CN CN201610465626.9A patent/CN107547086A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632610A (en) * | 2004-12-29 | 2005-06-29 | 上海华鼎科技教育设备有限公司 | Universal digitized nuclear magnetic resonance frequency source |
| CN103178838A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Device and method for frequency synthesis of phase-locked loop or phase-locked ring |
| CN103762978A (en) * | 2014-01-20 | 2014-04-30 | 东南大学 | Broadband low-phase noise frequency synthesizer without frequency divider based on harmonic mixing |
| CN205754278U (en) * | 2016-06-24 | 2016-11-30 | 丹东东方测控技术股份有限公司 | A kind of digitized nuclear magnetic resonance frequency source device |
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