CN110620554A - 200Mhz bandwidth input frequency converter - Google Patents
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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Abstract
The invention discloses a 200Mhz bandwidth input frequency converter, which comprises a 200Mhz bandwidth input frequency converter terminal, a PC software interface and a PC; the 200Mhz bandwidth input frequency converter terminal comprises an ARM chip, an A/D conversion module, a PC communication module, a reference 10Mhz source module, a high-precision clock source module, a frequency conversion module, an attenuator module, a detection module, a frequency mixing module, a high-precision filtering module, a temperature sensor and a power supply module; the A/D conversion module comprises a high-precision 24-bit A/D conversion chip and a peripheral circuit; the 200Mhz bandwidth input frequency converter is connected with the input end of the equipment by a signal source, and the frequency spectrograph is connected with the output port of the equipment and is well connected with the PC; if system equipment fails, the PC software can generate warning information and send out a prompt at the first time, and a worker can know some faults of the equipment through the prompt, so that system maintenance is greatly improved; the invention has strong inventiveness and is easy to popularize and use.
Description
Technical Field
The invention relates to the technical field of frequency converter application, in particular to a 200Mhz bandwidth input frequency converter.
Background
At present, various frequency conversion products are available on the market, and frequency conversion design schemes are also numerous, so that the frequency conversion device has wide application, especially on mobile, communication and telecommunication related equipment. However, frequency conversion products in the market are affected by the change of output amplitude along with temperature and input frequency, the fluctuation range is large, and the test indexes cannot meet the requirements. In such a case, signal integrity of the transmission of the radio frequency signal between the devices is affected and the error rate of decoding the receiving signal device increases. Under the background, it is very necessary to design a frequency converter scheme with high signal-to-noise ratio, stable amplitude and no temperature drift of frequency.
With the development of communication products, the requirements for signal transmission are higher and higher, and the integrity of signals in the transmission process and the reliability of the signals need to be ensured, so that a receiver can well receive the signals and analyze the clear signals. However, most of the frequency conversion schemes of industrial products in the current market have some disadvantages due to the following reasons: first, the phase noise of the frequency source degrades the signal-to-noise ratio of the sampled data, and the spurs reduce the receiver sensitivity. That is, in the transmission process of the signal, there is a ratio of the maximum undistorted signal to the actually input miscellaneous signal, called the signal-to-noise ratio. Therefore, the larger the amplitude of the useful signal is in transmission, the smaller the noise signal is, and the better the signal is transmitted. This is advantageous for the receiver to decode, and the higher the receiver sensitivity, the higher the quality of the decoded signal. However, the solutions in the market are not sufficient in this respect, and the signal-to-noise ratio of these solutions is relatively low, so that the quality of the decoded signal of the receiver is also modest. Secondly, the design scheme of frequency conversion products on the market is complex and huge, the software detection intelligence is low, and the running condition of the module can not be monitored in real time. The operator can not obtain the operation parameters of the equipment and modify the parameters at any time. Most of the frequency conversion products in the market are made of discrete components, and software is rarely added for control, so that the maintenance and supervision are difficult, the problems cannot be found and solved as soon as possible, and the maintenance is not facilitated. Thirdly, the frequency conversion range is single, and the frequency can not be input in a wide range. The common frequency conversion scheme of the equipment is single fixed frequency input and output. At most, two or three fixed inputs and a single output. If the frequency of the input needs to be modified, the input needs to be debugged from a new design, so that the design cost is increased, and the cycle time of the product is prolonged. The reliability is not stable; under the background, the invention combines the digital frequency conversion module, has good noise performance and stray in the industry, and the scheme of the invention has good signal quality and signal to noise ratio. The aim of which is to overcome the above mentioned drawbacks, the invention can be applied to markets comprising: broadband multicarrier, up-down conversion in multi-standard cellular base station equipment, as a low-jitter clock local oscillator generator, or as an adjustable reference source to obtain spurious-free signals; the method can also be used in microwave point-to-point communication, software radio and test measurement equipment of high QAM.
Disclosure of Invention
The invention provides a 200Mhz bandwidth input frequency converter, which adopts the technical scheme that a signal source is connected with an input end of equipment, a frequency spectrograph is connected with an output end of the equipment and is well connected with a PC, and a worker can know and control the running condition of a system in real time only by looking at parameters and warnings of a PC software end during working.
In order to realize the technical purpose, the invention adopts the technical scheme that: a200 Mhz bandwidth input frequency converter comprises a 200Mhz bandwidth input frequency converter terminal, a PC software interface and a PC; the 200Mhz bandwidth input frequency converter terminal comprises an ARM chip, an A/D conversion module, a PC communication module, a reference 10Mhz source module, a high-precision clock source module, a frequency conversion module, an attenuator module, a detection module, a frequency mixing module, a high-precision filtering module, a temperature sensor and a power supply module; the A/D conversion module comprises a high-precision 24-bit A/D conversion chip and a peripheral circuit; the PC communication module comprises a PC communication module and a peripheral circuit; the reference 10Mhz source module adopts a voltage-controlled crystal oscillator structure of a VCO (voltage controlled oscillator), and the output precision reaches 0.1hz by adjusting the voltage of the VCO; the high-precision clock source module comprises a clock chip and a peripheral interface circuit; the frequency conversion module comprises a variable frequency control chip and a peripheral control circuit; the attenuator module comprises a signal attenuation chip and peripheral circuits; the detection module comprises a detectable chip and a peripheral interface circuit part; the frequency mixing module comprises a frequency mixing chip and a peripheral circuit part; the high-precision filtering module comprises a 720Mhz filtering module, a 784Mhz filtering module and a 64Mhz filtering module; the temperature sensor comprises a temperature detection chip and a peripheral interface circuit part; the power supply module comprises a 12V stabilized power supply module, a 5V stabilized power supply module, a 3.3V stabilized power supply module, a circuit short-circuit protection module, an A/D conversion module, a PC communication module, a reference 10Mhz source module, a high-precision clock source module, two groups of frequency conversion modules, two groups of attenuator modules and two groups of detection modules, wherein the two groups of frequency mixing modules, the high-precision filtering module, the temperature sensor and the power supply module are connected through an ARM chip; the filtering ranges of the 720Mhz filtering module, the 784Mhz filtering module and the 64Mhz filtering module are plus or minus 10hz of the self filtering value.
Further, the frequency range of the input signal of the 200Mhz bandwidth input frequency converter terminal is 200Mhz-400 Mhz.
Furthermore, the frequency conversion module, the attenuator module, the detection module and the frequency mixing module are provided with two groups.
Further, the PC software interface comprises an external signal input frequency column, a working mode column, a signal attenuation value column, an internal frequency amplitude table, a command timeout real area, a current module working frequency table, a module attenuation value column and a module current temperature column.
Compared with the prior art, the invention has the following beneficial effects: the 200Mhz bandwidth input frequency converter is connected with the input end of equipment by a signal source, the frequency spectrograph is connected with the output port of the equipment and is well connected with a PC, the signal source is input from 200Mhz to 400Mhz, the frequency and the amplitude of a signal output on the frequency spectrograph cannot fluctuate, and the phase noise is below-110 dBm; the output frequency is accurate to 0.1 hz; the equipment can also be placed in an oven, and when the temperature is set to be from-10 degrees to 85 degrees, the signal output on the frequency spectrograph is observed to be stable and unchanged and the phase noise value is observed, so that the integrity of the transmission signal is ensured in the actual use process; meanwhile, the PC software can monitor the running state of the module, and know various data of the system and the running parameters of the control system. Therefore, the device management and maintenance personnel can greatly facilitate the work, and can know and control the running condition of the system in real time as long as the personnel see the parameters and the warning of the PC software end; if system equipment fails, the PC software can generate warning information and send out a prompt at the first time, and a worker can know some faults of the equipment through the prompt, so that system maintenance is greatly improved; the invention has strong inventiveness and is easy to popularize and use.
Drawings
FIG. 1 is a diagram of the hardware configuration of the present invention;
FIG. 2 is a schematic view of a monitoring interface according to the present invention;
FIG. 3 is an internal structural view of the present invention;
FIG. 4 is a flow chart of the operation of the present invention;
in the reference symbols: 101-frequency column of external signal input, 102-working mode column, 103-signal attenuation value, 104-internal frequency amplitude table, 105-command timeout real area, 106-current module working frequency table, 107-module attenuation value column, 108-module current temperature column, 109-alarm area, 201-output part of signal, 202-high precision clock source module, 203-frequency conversion module A, 204-frequency conversion module B, 205-signal input part, 206-attenuation module and detection module of signal output, 207-high precision 64Mhz filtering module and 10Mhz crystal voltage control crystal oscillator, 208-signal processing of input part, 209-device power supply part, 210-device external interface and 211-ARM chip module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a 200Mhz bandwidth input frequency converter includes a 200Mhz bandwidth input frequency converter terminal, a PC software interface and a PC; the 200Mhz bandwidth input frequency converter terminal comprises an ARM chip, an A/D conversion module, a PC communication module, a reference 10Mhz source module, a high-precision clock source module, a frequency conversion module, an attenuator module, a detection module, a frequency mixing module, a high-precision filtering module, a temperature sensor and a power supply module. Specifically, as shown in fig. 1, a 200Mhz-400Mhz frequency signal is input from an input port of the device, the amplitude is-40 dBm, the input signal is amplified through an amplifier module, the amplitude value is increased, the amplified signal is detected through an attenuator module and a detection module, and the amplified signal is input to an ARM. The amplified signal enters a mixer through an attenuator, wherein the mixer has an input signal, the frequency conversion module also generates an intermediate frequency signal which is input to the mixer together, and the frequency of the intermediate frequency signal generated by the output of the frequency converter is the sum of 720M and the input frequency. The signals output by the mixer module are 720Mhz, signals of 720Mhz pass through a narrow-band filter, noise signals input by the filter and signals of other frequencies generated by self interference are filtered, the amplitude of the signals is amplified by an amplifier and input to the mixer module of the next stage, the frequency of the signals entering the mixer module is 720Mhz, meanwhile, another frequency conversion module can generate a 784Mhz frequency and input to the mixer, the frequencies input by the two frequency conversion modules are mixed, then, the output frequency of 64Mhz can be generated, then, signals of other interference are filtered by a special high-precision filter of 64Mhz, and the signals are output by an attenuator and an amplifier. Meanwhile, the other detection module can detect the amplitude of the output signal, and the detection result is fed back to the ARM chip, so that the ARM chip can detect the value of the output signal and is used for adjusting the amplitude of the output signal. The ARM processor connects the peripheral devices together, the ARM chip receives the frequency of external actual input in an RS485 mode, and then the output frequency of the frequency conversion module is changed through an algorithm, so that the output frequency of an output port of the device is guaranteed to be unchanged, meanwhile, the size of a feedback signal is detected through the AD module, and the amplitude of the output frequency is adjusted through the attenuator. How to guarantee the accuracy of frequency signal output is analyzed below, mainly the reference crystal oscillator source of the frequency conversion module can be accurate to 0.1hz, the reference frequency is output by the high-accuracy reference clock module, a 51.2Mhz reference crystal oscillator is arranged outside the module itself, an input high-accuracy voltage-controlled crystal oscillator source 10Mhz is needed, and the frequency accuracy of an output signal can be matched with the frequency accuracy of the input signal. The working mode of the frequency converter is that an internal register of a reference clock module is arranged through an SPI interface of an ARM chip, a PLL1 and a PLL2 are arranged inside the module, then internal frequency division output is carried out, an external OSC and a reference frequency are arranged at the input of a PLL1, the frequency precision of the output can be consistent with the precision of the reference frequency through the arrangement of the internal register, and therefore the frequency converter module has a crystal oscillator source accurate to 0.1 hz. The reference crystal oscillator is provided by a VCO voltage-controlled crystal oscillator module, the voltage-controlled crystal oscillator can adjust voltage through a PWM signal of an ARM, output frequency is changed, accuracy of the reference crystal oscillator is improved, and the accuracy of the reference crystal oscillator is 0.1hz measured by a frequency meter. Each voltage controlled 10Mhz crystal oscillator needs to be calibrated and the frequency of its output is measured by a frequency meter. And (3) inputting parameters by an external RS485, debugging to a proper PWM, and then storing into the FLASH.
As shown in fig. 2, on this interface for sending commands, setting a frequency 101 of an external signal input, an operation mode low noise mode and a normal mode 102, setting an attenuation value 103 of a signal output, calibrating an internal frequency amplitude table 104, a real time zone 105 for sending commands, inquiring an operation frequency 106 of a current module, an attenuation value 107 of an inquiring module, an inquiring current temperature 108 of the module, and an alarm zone 109; the interface can set the working state of the module, can inquire the information of the module such as working frequency, attenuation value, temperature and the like, and can also realize the alarm information of the module, thereby greatly facilitating the work of equipment management and maintenance personnel, and the personnel can know and control the running condition of the system in real time as long as the personnel see the parameters and the alarm of the PC software end; if the system equipment has faults, timely repair is facilitated, and the system equipment can work normally.
As shown in fig. 3, the schematic structure of the internal layout scheme of the present invention, because the present invention relates to the problem of radio frequency, the layout of the modules has a great influence on the design index, and the modules interfere with each other. Each individual module requires a shielding box or box that would otherwise produce a self-excitation that affects the signal index of the output.
As shown in fig. 4, the present invention has an independent work flow, and the main core is an ARM chip, which undertakes the work of detecting and processing signals. When the frequency converter with 200Mhz bandwidth input is connected with an external power supply, the ARM chip can automatically initialize relevant parameters of each module and an interface setting part required to be used.
The working principle of the invention is as follows: when the equipment is connected with a signal source at an input port, an output port is connected with a frequency spectrograph, and an RS485 port is connected with a PC; when the computer is started, the ARM chip has a default input frequency which is generally an input intermediate frequency and is 300 Mhz; therefore, the ARM chip can perform initialization parameter setting on the first-stage frequency converter module, the output intermediate frequency of the frequency converter module is 1020Mhz, and according to the principle of the frequency mixer, the intermediate frequency P0 is P1+ P2, where P0 is the intermediate frequency output by the frequency converter module, P1 is the input frequency of the frequency mixer, and P2 is the output frequency of the frequency mixer. To set the parameters of the frequency converter module and let it output the required intermediate frequency, two very important registers are needed, according to the principle of the frequency conversion module, it calculates the input frequency into a fractional part and an integer part, and then writes the calculated value into the internal register. According to the principle formula N _ INT ═ FREQ _ Khz/REF _ FREQ _ Khz, N _ FRAC (FREQKhz% REF _ FREQ _ Khz _) _ 1024/REF _ FREQ _ Khz. Wherein N _ INT is an integer part, the frequency of FREQ _ Khz input, REF _ FREQ _ Khz is the reference frequency of the frequency conversion module, and N _ FRAC fractional part. Because of the discrete type of the device, the difference of resistance and capacitance, the characteristics of each input frequency are different, and the temperature is increased along with the long-time normal work of the equipment module; the equipment can be located outdoors, the equipment can work at high temperature or low temperature due to different places, the characteristic change of the device along with the temperature is obviously reflected, the frequency amplitude output by the equipment has an error of about 6dBm through high-low temperature test, software is required to be calibrated through the attenuator, and due to the fact that 2 attenuator modules are used in the scheme, the adjustment range of 62dBm can be achieved totally, but the attenuation value of 31dBm is needed when the attenuator is arranged outside. So 31dBm is reserved for adjusting the output amplitude. The working temperature of the module is inquired through ARM software, and errors caused by inconsistency of the device are correspondingly made up. The frequency output by the equipment is converted into corresponding signal intensity through AD by a detection module AD8362, according to the principle that S _ AMP is AD _ VALUE V _ REF/AD _ BIT/STEP + OFFSET, wherein S _ AMP is the output intensity of the signal, AD _ VALUE is the VALUE of the detection module converting an analog signal into a digital signal, V _ REF is the reference voltage of the AD module, 3300mV, AD _ BIT is the conversion digit of the AD module, STEP is the STEP of 1mV corresponding to 1mV, 33mV/dBm and OFFSET are the VALUEs for module calibration. Thus, the amplitude of the output signal can be known and compared with 0dBm to control the working mode of the attenuator. And a two-dimensional table is arranged in ARM software, the amplitude correction value corresponding to the temperature and the input frequency of the current equipment module is searched, the value needs to be actually tested, is written into the ARM through RS485 and is stored in a FLASH of the ARM.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.
Claims (5)
1. A200 Mhz bandwidth input frequency converter comprises a 200Mhz bandwidth input frequency converter terminal and a PC software interface; the method is characterized in that: the 200Mhz bandwidth input frequency converter terminal comprises an ARM chip, an A/D conversion module, a PC communication module, a reference 10Mhz source module, a high-precision clock source module, a frequency conversion module, an attenuator module, a detection module, a frequency mixing module, a high-precision filtering module, a temperature sensor and a power supply module; the A/D conversion module comprises a high-precision 24-bit A/D conversion chip and a peripheral circuit; the PC communication module comprises a PC communication module and a peripheral circuit; the reference 10Mhz source module adopts a voltage-controlled crystal oscillator structure of a VCO (voltage controlled oscillator), and the output precision reaches 0.1hz by adjusting the voltage of the VCO; the high-precision clock source module comprises a clock chip and a peripheral interface circuit; the frequency conversion module comprises a variable frequency control chip and a peripheral control circuit; the attenuator module comprises a signal attenuation chip and peripheral circuits; the detection module comprises a detectable chip and a peripheral interface circuit part; the frequency mixing module comprises a frequency mixing chip and a peripheral circuit part; the temperature sensor comprises a temperature detection chip and a peripheral interface circuit part; the power supply module comprises a 12V stabilized power supply module, a 5V stabilized power supply module, a 3.3V stabilized power supply module, a circuit short-circuit protection module, an A/D conversion module, a PC communication module, a reference 10Mhz source module, a high-precision clock source module, two groups of frequency conversion modules, two groups of attenuator modules and two groups of detection modules, wherein the two groups of frequency mixing modules, the high-precision filtering module, the temperature sensor and the power supply module are connected through an ARM chip; the filtering ranges of the 720Mhz filtering module, the 784Mhz filtering module and the 64Mhz filtering module are plus or minus 10hz of the self filtering value.
2. The 200Mhz bandwidth input frequency converter of claim 1, wherein: the frequency range of the 200Mhz bandwidth input frequency converter terminal input signal is 200Mhz-400 Mhz.
3. The 200Mhz bandwidth input frequency converter of claim 1, wherein: the frequency conversion module, the attenuator module, the detection module and the frequency mixing module are all provided with two groups.
4. The 200Mhz bandwidth input frequency converter of claim 1, wherein: the PC software interface comprises an external signal input frequency column, a working mode column, a signal attenuation value column, an internal frequency amplitude table, a command overtime real area, a current module working frequency table, a module attenuation value column and a module current temperature column.
5. The 200Mhz bandwidth input frequency converter of claim 1, wherein: the high-precision filtering module comprises a 720Mhz filtering module, a 784Mhz filtering module and a 64Mhz filtering module; the power supply module comprises a 12V voltage-stabilized power supply module, a 5V voltage-stabilized power supply module, a 3.3V voltage-stabilized power supply module and a circuit short-circuit protection module.
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| CN202978727U (en) * | 2012-12-14 | 2013-06-05 | 台州富凌电气有限公司 | Single-phase input converter |
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| CN107222268A (en) * | 2017-07-31 | 2017-09-29 | 武汉虹信通信技术有限责任公司 | A kind of power amplifier module intermodulation is debugged and test system and method automatically |
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2018
- 2018-06-19 CN CN201810692509.5A patent/CN110620554A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020048325A1 (en) * | 2000-09-21 | 2002-04-25 | Samsung Electronics Co., Ltd. | Digital down-converter |
| CN202057788U (en) * | 2011-02-28 | 2011-11-30 | 四川九洲电器集团有限责任公司 | Universal data processing module for L wave band |
| CN102664591A (en) * | 2012-04-28 | 2012-09-12 | 成都泰格微波技术股份有限公司 | Frequency conversion channel circuit of small-sized airborne upconversion system |
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