CN103546172A - Radio-frequency signal generator - Google Patents
Radio-frequency signal generator Download PDFInfo
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- CN103546172A CN103546172A CN201310544560.9A CN201310544560A CN103546172A CN 103546172 A CN103546172 A CN 103546172A CN 201310544560 A CN201310544560 A CN 201310544560A CN 103546172 A CN103546172 A CN 103546172A
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Abstract
The invention relates to a radio-frequency signal generator. The radio-frequency signal generator comprises a phase-locked loop, a frequency extension module, a switch filter bank, an automatic level control module, an output attenuation module and an amplitude modulation module. The AM module receives radio-frequency carrier signals output by the switch filter bank, and the radio-frequency carrier signals are processed in an AM mode to form amplitude-modulated signals to be output to the automatic level control module. The AM module comprises a variable attenuation module and an amplifier. The variable attenuation module receives the radio-frequency carrier signals output by the switch filter bank, the radio-frequency carrier signals are processed in the AM mode to form the amplitude-modulated signals to be output to the amplifier, and the amplitude-modulated signals are output to the automatic level control module after being amplified by the amplifier. Due to the fact that the independent AM module is additionally arranged on the radio-frequency signal generator, the requirements for an automatic level control module can be lowered, design difficulty can be reduced, and debugging and calibration time can be saved.
Description
Technical field
The present invention relates to a kind of signal generator, particularly relate to a kind of radio-frequency signal generator.
Background technology
In order to realize amplitude modulation (AM) function of signal generator, guarantee the power output precision of signal generator simultaneously, generally can introduce automatic electric-level and control (Auto Level Control, is abbreviated as ALC) loop.As shown in Figure 1, before output pad module, add automatic electric-level to control ALC module.Signal generator in Fig. 1 comprises: phase-locked loop (PLL), frequency expansion module, switch filter group, automatic electric-level are controlled ALC module and output attenuatoin module.Phase-locked loop pll produces the frequency of voltage control voltage controlled oscillator by phase demodulation, loop filtering, produce the general f2 >=2*f1 of frequency range f1-f2() signal.Because final signal generator reference frequency output is f3-f4, so increased frequency expansion module, when output frequency f<f1, by frequency division, obtain signal, when output frequency f>f2, by frequency multiplication, obtain signal.This signal comprises abundant harmonic wave, has therefore introduced switch filter group, according to f, selects corresponding filter, guarantees spectral purity.Filtered signal is controlled ALC module by automatic electric-level and is controlled output amplitude precision, realizes amplitude modulation, and ALC module is mainly to realize amplitude control and amplitude modulation by changing the value of variable gain or decay.The output of ALC module finally realizes large-scale power stage by output pad module.
But, lifting along with output signal frequency, amplitude modulation(PAM) performance, the requirement of automatic electric-level being controlled to ALC module is also more and more higher, and automatic electric-level is controlled ALC module not only will meet minimum resolution requirement, also will possess the good linearity to guarantee modulation depth and modulation distortion index simultaneously.This just controls and has proposed very high requirement automatic electric-level.
It is generally to realize amplitude modulation(PAM) and amplitude control by variable attenuation module (or variable gain module) that automatic electric-level is controlled ALC module.And generally, variable attenuation module (or variable gain module) is under a certain fixed frequency, fixed modulation speed, it is not completely linear that its attenuation (or gain) is controlled; In addition, under the input signal of different frequency and different modulation rate, it is also completely different that its attenuation (or gain) is controlled curve.These all will inevitably bring the modulation depth of signal and modulation distortion index to change with frequency, modulation rate.
Automatic electric-level is controlled ALC module except completing precision control, thereby also to offset the non-linear assurance amplitude modulation index of described variable attenuation module, therefore the design of automatic electric-level control ALC module becomes more complicated, increased automatic electric-level and controlled the pressure of ALC module and debug the alignment time, and the calibration operation amount of signal generator complete machine is huge.
Summary of the invention
Technical problem to be solved: the invention provides a kind of requirement that can reduce automatic electric-level control ALC module for above problem, save the radio-frequency signal generator of debugging and alignment time.
Technical scheme: in order to overcome the above problems, the invention provides a kind of radio-frequency signal generator, comprise: phase-locked loop, frequency expansion module, switch filter group, automatic electric-level control module and output attenuatoin module, is characterized in that: also comprise AM amplitude modulation module; The radio-frequency carrier signal of AM amplitude modulation module receiving key bank of filters output carries out forming amplitude-modulated signal after amplitude modulation process and exports to automatic electric-level control module.The Main Function of AM amplitude modulation module is exactly according to the setting of signal generator outgoing carrier frequency, modulation rate and modulation depth, realizes amplitude modulation function, guarantees modulation depth and modulation distortion index.
Described AM amplitude modulation module comprises: variable attenuation module and amplifier; The radio-frequency carrier signal of variable attenuation module receiving key bank of filters output carries out forming amplitude-modulated signal after amplitude modulation process and exports to amplifier, and amplifier is exported to automatic electric-level control module after amplifying processing.Amplifier is for the insertion loss of compensate for variable attenuation module.
Described variable attenuation module comprises: variable attenuator, digital to analog converter, audio signal generator and FPGA;
Described FPGA generates control signal, exports to audio signal generator and digital to analog converter, and this control signal is binary digit amount;
Described audio signal generator receives the control signal of described FPGA output, generates audio signal, exports to digital to analog converter;
Described digital to analog converter, for controlling the amplitude of described audio signal, receives the control signal of FPGA and the audio signal that audio signal generator produces, and carries out after changes in amplitude processing, and output modulation signal is to variable attenuator;
Described variable attenuator variable attenuator is used for realizing amplitude modulation, and its attenuation to radio-frequency carrier is continuous variable, and changes along with the variation of its control end analog voltage; The modulation signal of the radio-frequency carrier signal of receiving key bank of filters output and digital to analog converter output, realizes the amplitude modulation(PAM) to the radio-frequency carrier signal of switch bank of filters output, i.e. amplitude modulation, and export signal after this amplitude modulation to amplifier.
Described variable attenuator is simulation control attenuator;
Described simulation is controlled the quantity of attenuator and is not limit.
Useful effect:
The present invention, by increasing independently AM amplitude modulation module, can reduce requirement, reduction design difficulty, saving debugging and the alignment time of automatic electric-level being controlled to ALC module.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be done to simple introduction below, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.In the accompanying drawings:
Fig. 1 is the signal generator schematic diagram of prior art;
Fig. 2 is the signal generator schematic diagram of the embodiment of the present invention;
Fig. 3 is the structure chart of embodiment of the present invention amplitude modulation module;
Fig. 4 is the structure chart of embodiment of the present invention variable attenuation module;
Fig. 5 is the structural representation of embodiment of the present invention variable attenuator
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details.
Embodiment:
As shown in Figure 2, a kind of radio-frequency signal generator, comprising: phase-locked loop, frequency expansion module, switch filter group, automatic electric-level control module and output attenuatoin module, also comprise AM amplitude modulation module; The radio-frequency carrier signal of AM amplitude modulation module receiving key bank of filters output carries out forming amplitude-modulated signal after amplitude modulation process and exports to automatic electric-level control module.The Main Function of AM amplitude modulation module is exactly according to the setting of signal generator outgoing carrier frequency, modulation rate and modulation depth, realizes amplitude modulation function, guarantees modulation depth and modulation distortion index.
As shown in Figure 3, described AM amplitude modulation module comprises: variable attenuation module and amplifier; The radio-frequency carrier signal of variable attenuation module receiving key bank of filters output carries out forming amplitude-modulated signal after amplitude modulation process and exports to amplifier, and amplifier is exported to automatic electric-level control module after amplifying processing.Amplifier is for the insertion loss of compensate for variable attenuation module.
As shown in Figure 4, described variable attenuation module comprises: variable attenuator, digital to analog converter, audio signal generator and FPGA;
Described FPGA generates control signal, exports to audio signal generator and digital to analog converter, and this control signal is binary digit amount;
Described audio signal generator receives the control signal of described FPGA output, generates audio signal, exports to digital to analog converter;
Described digital to analog converter, for controlling the amplitude of described audio signal, receives the control signal of FPGA and the audio signal that audio signal generator produces, and carries out after changes in amplitude processing, and output modulation signal is to variable attenuator;
Described variable attenuator variable attenuator is used for realizing amplitude modulation, and its attenuation to radio-frequency carrier is continuous variable, and changes along with the variation of its control end analog voltage; The modulation signal of the radio-frequency carrier signal of receiving key bank of filters output and digital to analog converter output, realizes the amplitude modulation(PAM) to the radio-frequency carrier signal of switch bank of filters output, i.e. amplitude modulation, and export signal after this amplitude modulation to amplifier.
As shown in Figure 5, described variable attenuator is simulation control attenuator; Described simulation is controlled the quantity of attenuator and is not limit.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiment of the invention case; the protection range being not intended to limit the present invention, within the spirit and principles in the present invention all, any modification of making; protection scope of the present invention is equal to replacement, improvement etc., within all should be included in.
Claims (5)
1. a radio-frequency signal generator, comprising: phase-locked loop, frequency expansion module, switch filter group, automatic electric-level control module and output attenuatoin module, is characterized in that: also comprise AM amplitude modulation module; The radio-frequency carrier signal of AM amplitude modulation module receiving key bank of filters output carries out forming amplitude-modulated signal after amplitude modulation process and exports to automatic electric-level control module.
2. a kind of radio-frequency signal generator according to claim 1, is characterized in that: described AM amplitude modulation module comprises: variable attenuation module and amplifier; The radio-frequency carrier signal of variable attenuation module receiving key bank of filters output carries out forming amplitude-modulated signal after amplitude modulation process and exports to amplifier, and amplifier is exported to automatic electric-level control module after amplifying processing.
3. a kind of radio-frequency signal generator according to claim 2, is characterized in that: described variable attenuation module comprises: variable attenuator, digital to analog converter, audio signal generator and FPGA;
Described FPGA generates control signal, exports to audio signal generator and digital to analog converter, and this control signal is binary digit amount;
Described audio signal generator receives the control signal of described FPGA output, generates audio signal, exports to digital to analog converter;
Described digital to analog converter, for controlling the amplitude of described audio signal, receives the control signal of FPGA and the audio signal that audio signal generator produces, and carries out after changes in amplitude processing, and output modulation signal is to variable attenuator;
Described variable attenuator variable attenuator is used for realizing amplitude modulation, and its attenuation to radio-frequency carrier is continuous variable, and changes along with the variation of its control end analog voltage; The modulation signal of the radio-frequency carrier signal of receiving key bank of filters output and digital to analog converter output, realizes the amplitude modulation(PAM) to the radio-frequency carrier signal of switch bank of filters output, i.e. amplitude modulation, and export signal after this amplitude modulation to amplifier.
4. a kind of radio-frequency signal generator according to claim 3, is characterized in that: described variable attenuator is simulation control attenuator.
5. a kind of radio-frequency signal generator according to claim 4, is characterized in that: described simulation is controlled the quantity of attenuator and do not limit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310544560.9A CN103546172B (en) | 2013-11-06 | 2013-11-06 | A kind of radio-frequency signal generator |
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| CN201310544560.9A CN103546172B (en) | 2013-11-06 | 2013-11-06 | A kind of radio-frequency signal generator |
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| CN103546172A true CN103546172A (en) | 2014-01-29 |
| CN103546172B CN103546172B (en) | 2016-03-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106341086A (en) * | 2016-08-17 | 2017-01-18 | 中国电子科技集团公司第四十研究所 | Deep amplitude modulation circuit based on threshold judgment, and amplitude modulation method |
| CN106888000A (en) * | 2015-12-15 | 2017-06-23 | 苏州普源精电科技有限公司 | A kind of measurement apparatus with alc circuit |
| CN109687878A (en) * | 2018-12-25 | 2019-04-26 | 成都前锋电子仪器有限责任公司 | Synthesis output circuit for radio frequency synthetic source |
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| CN1774857A (en) * | 2003-02-20 | 2006-05-17 | 索尼爱立信移动通讯股份有限公司 | Efficient modulation of RF signals |
| CN102970033A (en) * | 2011-08-29 | 2013-03-13 | 株式会社东芝 | Signal generator, oscillator, and radar device |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1774857A (en) * | 2003-02-20 | 2006-05-17 | 索尼爱立信移动通讯股份有限公司 | Efficient modulation of RF signals |
| CN102970033A (en) * | 2011-08-29 | 2013-03-13 | 株式会社东芝 | Signal generator, oscillator, and radar device |
Non-Patent Citations (2)
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| 肖炎根: "基于DSP Builder的AM信号发生器的设计", 《电子技术》, no. 3, 31 March 2010 (2010-03-31) * |
| 马志威等: "应用于全数字发射机的射频信号发生器", 《固体电子学研究与进展》, vol. 33, no. 3, 30 June 2013 (2013-06-30) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106888000A (en) * | 2015-12-15 | 2017-06-23 | 苏州普源精电科技有限公司 | A kind of measurement apparatus with alc circuit |
| CN106888000B (en) * | 2015-12-15 | 2021-06-25 | 普源精电科技股份有限公司 | Measuring device with ALC circuit |
| CN106341086A (en) * | 2016-08-17 | 2017-01-18 | 中国电子科技集团公司第四十研究所 | Deep amplitude modulation circuit based on threshold judgment, and amplitude modulation method |
| CN109687878A (en) * | 2018-12-25 | 2019-04-26 | 成都前锋电子仪器有限责任公司 | Synthesis output circuit for radio frequency synthetic source |
| CN109687878B (en) * | 2018-12-25 | 2024-03-19 | 成都前锋电子仪器有限责任公司 | Synthetic output circuit for radio frequency synthetic source |
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| CN103546172B (en) | 2016-03-30 |
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