CN104270148A - Broadband digital fixed-amplitude multi-system radio frequency signal source module - Google Patents
Broadband digital fixed-amplitude multi-system radio frequency signal source module Download PDFInfo
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- CN104270148A CN104270148A CN201410415711.5A CN201410415711A CN104270148A CN 104270148 A CN104270148 A CN 104270148A CN 201410415711 A CN201410415711 A CN 201410415711A CN 104270148 A CN104270148 A CN 104270148A
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Abstract
The invention discloses a broadband digital fixed-amplitude multi-system radio frequency signal source module. The radio frequency signal source module consists of a radio frequency circuit and a digital circuit; high amplitude output accuracy is realized by adopting a digital fixed-amplitude way; amplitude output in a large dynamic range is realized by adopting a four-stage cascade way; broadband frequency output is realized by adopting a DDS (Direct Digital Synthesizer)+frequency conversion way; and moreover, through the radio frequency signal source module, a radio frequency signal output function, data acquisition, a replay function, a function generator function, and direct output and up-conversion output functions of client signals of lower than 300MHz are realized. The module disclosed by the invention has excellent performance and high cost performance, is low in cost, and can be applied to signal testing in radar, navigation, electronic countermeasure, radio and television, semiconductors, wireless communication systems, college teaching and the like.
Description
Technical field
The present invention relates to signal testing field, be specifically related to a kind of wideband digital fixed ampllitude multi-modulation scheme radiofrequency signal source module.
Background technology
Contemporary broadband radio-frequency signal source mainly adopts complicated many rings frequency synthesis technique, and sampling local oscillator technology, realizes the local oscillation signal of high target; Amplitude precision adopts the hardware fixed amplitude circuit of high cost to realize; Output signal dynamic range will lean on the fixed attenuator of high cost to realize, and price general charged is at several thousand yuan; Its complete machine structure is complicated, cost is high.Except external AGILENT company, Ji Jia major company of RS company, seldom domestic.It is slow that module of the present invention adopts DDS frequency synthesis technique, integrated phase lock technology, digital fixed ampllitude technology, high-speed AD acquisition technology, secondary mixing technology solves signal scanning speed, dynamic range is little, output signal is uneven, the problem that cost is high, the performance of great raising complete machine, reduce the measurement cost of user, and volume is very little, is easy to realize the system integration.For the use of client brings great convenience.
Summary of the invention
The object of the invention is to provide a kind of wideband digital fixed ampllitude multi-modulation scheme radiofrequency signal source module, great reduced volume, possesses excellent performance, broadband, great dynamic range exports, and possesses radiofrequency signal output function simultaneously, data acquisition, playback function, function generator function, client is less than 300MHz signal and directly exports and up-conversion output function, can also effectively reduce user and measure cost.
The technical solution used in the present invention is:
Wideband digital fixed ampllitude multi-modulation scheme radiofrequency signal source module, it is characterized in that: include DDS frequency synthesizer, DDS frequency synthesizer produces modulated-analog signal or the digital modulation signals that frequency is 9kHz ~ 300MHz, the signal of 9kHz ~ 300MHz is selected through switch one, switch two, without mixing, directly switch amplification, after switch seven, directly output is amplified in decay; Also include the fixed intermediate frequency signal that a frequency is 300 MHz, the signal of 300 MHz is selected by through switch one, switch two, through attenuator ATT1 digital attenuation, two fixed intermediate frequencies are produced again with local oscillator LO1 mixing, select through switch three, switch four, then carry out mixing with local oscillator LO2 and produce 300MHz ~ 3.2GHz signal, mixed signal enters switch filtering amplifier module and carries out signal filtering, after switch seven, output is amplified in decay; When to be less than frequency be the fixed intermediate frequency signal of 300MHz to external client's end signal, select through switch one, switch two, switch seven; When external client's end signal is 9kHz ~ 300MHz signal, decay can be amplified and directly export; When external client's end signal is 300MHz ~ 3.2GHz signal, through through switch one, switch two, through attenuator ATT1, frequency mixer, switch filtering amplifier module, through switch seven, output is amplified in decay; When external client's end signal is 9kHz ~ 3.2GHz signal, after switch seven, also will by being divided into two-way after attenuator ATT2, amplifier, coupler, leading up to attenuator ATT3, attenuator ATT4 exports, and a road enters detector, the voltage signal detected sends into CPU, compared with calibration data, draw range error, then by FPGA process, the control signal that FPGA exports controls four numerical-control attenuators ATT1, ATT2, ATT3, ATT4, thus realizes signal power fixed ampllitude.
Described wideband digital fixed ampllitude multi-modulation scheme radiofrequency signal source module, is characterized in that: described switch filtering amplifier module includes front amplifier, switch five, filter, switch six, rear amplifier.
Operation principle of the present invention is:
The present invention adopts DDS+ conversion system to realize wideband frequency and exports, 3.2GHz can be reached, the radiofrequency signal of 9kHz to 300MHz directly generates output by DDS, the radiofrequency signal of 300MHz to 3.2GHz is generated by double conversion and exports, simultaneously by switching, client provides and is less than 300MHz information signal and directly exports and output to 3.2GHz with up-conversion; Adopt level Four cascade system to realize amplitude great dynamic range to export, output area can reach-120dBm ~ 0dBm, adopt the decay of level Four attenuator cascade system to realize, attenuator ATT1 mainly realizes 0.1dB resolution, and numerical-control attenuator ATT2, ATT3, ATT4 realize large stepping decay; Adopt digital fixed ampllitude mode to realize amplitude and export high accuracy, obtain signal voltage value compared with calibration data by radio frequency detector device, draw range error, then by CPU regulated attenuator, keep correct amplitude to export in real time, precision reaches ± 1.5dB; Adopt high-speed AD, DA switch technology, collection can be realized and be less than or equal to 45kHz signal data, and can playback; Realizable function generator function, sine wave output, square wave, sawtooth waveforms, triangular wave, sweep sine wave signal export.
Actual demand is measured for active user, major part user will use signal source to transmit for measuring, switching over inside is utilized to adopt DDS+ converter technique to produce output signal in the present invention, on passage, cascade digital pad produces Larger Dynamic pad value, export small-signal, analog-modulated and digital modulation are realized by DDS, digiboard utilizes AD the collection of DA chip and playback signal, the outside alternative DDS signal input of switching over is utilized to be less than 300MHz customer information signal, direct or up-conversion exports, reach customer requirement, realize measuring.
Advantage of the present invention:
The present invention is directed to the actual measurement demand of user, multiple technologies are adopted to achieve wideband digital fixed ampllitude multi-modulation scheme radiofrequency signal source module, great reduced volume, be easy to the system integration, there is broadband, great dynamic range exports, possesses radiofrequency signal output function simultaneously, data acquisition, playback function, function generator function, provide client to be less than 300MHz information signal and directly export and up-conversion output function, other signal sources cannot substitute, integrated level of the present invention is very high, and greatly low user measures cost.
Accompanying drawing explanation
Fig. 1 is the theory diagram of wideband digital fixed ampllitude multi-modulation scheme radiofrequency signal source module of the present invention.
Embodiment
See Fig. 1, wideband digital fixed ampllitude multi-modulation scheme radiofrequency signal source module is made up of hardware circuit and digital system circuit two parts, and wherein hardware circuit completes switching over, the generation of radiofrequency signal, amplification, frequency conversion, amplitude fading; Digital system system completes the control of radio circuit, the setting of parameter, and inside and outside Interface Controller.
Include DDS 8, DDS 8 and produce the modulated-analog signal or digital modulation signals that frequency is 9kHz ~ 300MHz, the signal of 9kHz ~ 300MHz is selected through switch 1, switch 2, without mixing, directly switches amplification, after switch seven, directly output is amplified in decay; Also include the fixed intermediate frequency signal that a frequency is 300 MHz, the signal of 300 MHz is selected by through switch 1, switch 2, through attenuator ATT1 digital attenuation, two fixed intermediate frequencies are produced again with local oscillator LO1 mixing, select through switch 3, switch 4, carry out mixing with local oscillator LO2 again and produce 300MHz ~ 3.2GHz signal, its tuning equation is as follows:
Mixed signal enters switch filtering amplifier module 9 and carries out signal filtering, and after switch 7, output is amplified in decay;
When to be less than frequency be the fixed intermediate frequency signal of 300MHz to external client's end signal, select through switch 1, switch 2, switch 7; When external client's end signal is 9kHz ~ 300MHz signal, decay can be amplified and directly export; When external client's end signal is 300MHz ~ 3.2GHz signal, through through switch 1, switch 2, through attenuator ATT1, frequency mixer, switch filtering amplifier module 9, through switch 7, output is amplified in decay; When external client's end signal is 9kHz ~ 3.2GHz signal, after switch 7, also will by being divided into two-way after attenuator ATT2, amplifier, coupler 10, leading up to attenuator ATT3, attenuator ATT4 exports, one tunnel enters wave detector 11 detection, the voltage signal detected sends into CPU 12, compared with calibration data, draw range error, processed by FPGA 13 again, the control signal that FPGA 13 exports controls four numerical-control attenuators ATT1, ATT2, ATT3, ATT4, thus realizes signal power amplitude stubilization.
Switch filtering amplifier module 9 includes front amplifier, switch 5, filter, switch 6, rear amplifier.
Claims (2)
1. wideband digital fixed ampllitude multi-modulation scheme radiofrequency signal source module, it is characterized in that: include DDS frequency synthesizer, DDS frequency synthesizer produces modulated-analog signal or the digital modulation signals that frequency is 9kHz ~ 300MHz, the signal of 9kHz ~ 300MHz is selected through switch one, switch two, without mixing, directly switch amplification, after switch seven, directly output is amplified in decay; Also include the fixed intermediate frequency signal that a frequency is 300 MHz, the signal of 300 MHz is selected by through switch one, switch two, through attenuator ATT1 digital attenuation, two fixed intermediate frequencies are produced again with local oscillator LO1 mixing, select through switch three, switch four, then carry out mixing with local oscillator LO2 and produce 300MHz ~ 3.2GHz signal, mixed signal enters switch filtering amplifier module and carries out signal filtering, after switch seven, output is amplified in decay; When to be less than frequency be the fixed intermediate frequency signal of 300MHz to external client's end signal, select through switch one, switch two, switch seven; When external client's end signal is 9kHz ~ 300MHz signal, decay can be amplified and directly export; When external client's end signal is 300MHz ~ 3.2GHz signal, through through switch one, switch two, through attenuator ATT1, frequency mixer, switch filtering amplifier module, through switch seven, output is amplified in decay; When external client's end signal is 9kHz ~ 3.2GHz signal, after switch seven, also will by being divided into two-way after attenuator ATT2, amplifier, coupler, leading up to attenuator ATT3, attenuator ATT4 exports, and a road enters detector, the voltage signal detected sends into CPU, compared with calibration data, draw range error, then by FPGA process, the control signal that FPGA exports controls four numerical-control attenuators ATT1, ATT2, ATT3, ATT4, thus realizes signal power fixed ampllitude.
2. wideband digital fixed ampllitude multi-modulation scheme radiofrequency signal source module according to claim 1, is characterized in that: described switch filtering amplifier module includes front amplifier, switch five, filter, switch six, rear amplifier.
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| CN201410415711.5A CN104270148A (en) | 2014-08-21 | 2014-08-21 | Broadband digital fixed-amplitude multi-system radio frequency signal source module |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106953600A (en) * | 2017-02-28 | 2017-07-14 | 安徽白鹭电子科技有限公司 | A kind of rearmounted mixing type numeral ALC control system devices based on DDS |
| CN109217884A (en) * | 2018-10-17 | 2019-01-15 | 中国电子科技集团公司第四十研究所 | A kind of transmission channel device for supporting standard traffic standard signal |
| CN109521385A (en) * | 2018-11-22 | 2019-03-26 | 北京东方计量测试研究所 | A kind of signal source module and signal generating method for oscillograph calibrating |
| CN111092627A (en) * | 2019-11-28 | 2020-05-01 | 中电科仪器仪表(安徽)有限公司 | Accurate control device for supporting full-standard broadband communication signal level |
| CN111224622A (en) * | 2019-11-21 | 2020-06-02 | 中电科仪器仪表有限公司 | Noise signal generating device and method with adjustable center frequency and bandwidth |
| CN112653459A (en) * | 2020-12-28 | 2021-04-13 | 成都美数科技有限公司 | Radio frequency signal source capable of being calibrated in real time |
| CN113900071A (en) * | 2021-12-07 | 2022-01-07 | 湖南宜通华盛科技有限公司 | Output power detection circuit, adjustment method, detection method and phased array radar |
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2014
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| EP1659685A1 (en) * | 2004-11-17 | 2006-05-24 | Alps Electric Co., Ltd. | Frequency converter with two stages |
| CN101471662A (en) * | 2007-12-26 | 2009-07-01 | 中国科学院微电子研究所 | 6 to 8.2GHz five-band frequency synthesizer for OFDM UWB |
| CN201571018U (en) * | 2009-12-02 | 2010-09-01 | 成都联帮微波通信工程有限公司 | Microwave broadband up-converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106953600A (en) * | 2017-02-28 | 2017-07-14 | 安徽白鹭电子科技有限公司 | A kind of rearmounted mixing type numeral ALC control system devices based on DDS |
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| CN111224622A (en) * | 2019-11-21 | 2020-06-02 | 中电科仪器仪表有限公司 | Noise signal generating device and method with adjustable center frequency and bandwidth |
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| CN111092627A (en) * | 2019-11-28 | 2020-05-01 | 中电科仪器仪表(安徽)有限公司 | Accurate control device for supporting full-standard broadband communication signal level |
| CN112653459A (en) * | 2020-12-28 | 2021-04-13 | 成都美数科技有限公司 | Radio frequency signal source capable of being calibrated in real time |
| CN113900071A (en) * | 2021-12-07 | 2022-01-07 | 湖南宜通华盛科技有限公司 | Output power detection circuit, adjustment method, detection method and phased array radar |
| CN113900071B (en) * | 2021-12-07 | 2022-03-04 | 湖南宜通华盛科技有限公司 | Output power detection circuit, adjustment method, detection method and phased array radar |
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Application publication date: 20150107 |