CN109560794A - Vector Modulation radio-frequency signal generator - Google Patents
Vector Modulation radio-frequency signal generator Download PDFInfo
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- H—ELECTRICITY
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- H—ELECTRICITY
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Abstract
The present invention provides a kind of Vector Modulation radio-frequency signal generators, including RF local oscillator module, Vector Modulation module, rf conversion module, broadband fixed ampllitude module and output module.The Vector Modulation module is for generating radio frequency orthogonal local oscillation signal and base band amplified signal, the phase-locked loop module and baseband signal generation module that connects including radio frequency I/Q modulation module and respectively with the radio frequency I/Q modulation module；Vector Modulation radio-frequency signal generator of the invention has the characteristics that radio frequency width is wide, modulation function is powerful, at the same it is low in cost, easy to use, simple, be suitable for it is practical.
Description
Technical field
The present invention relates to a kind of Vector Modulation radio-frequency signal generators, belong to radiofrequency signal field.
Background technique
Versatile signal generator just has already appeared in the twenties in last century, with communication and the development of Radar Technology and mark
The appearance of calibration signal generator, so that signal generator develops into the measuring instrument of quantitative analysis.Occur the sixties in last century
Function generator and radio-frequency signal generator；After the microprocessor seventies occurs, digital-to-analogue is carried out using microprocessor, modulus turns
The function further expansion of signal generator is allowed to generate more complicated waveform by the signal generator changed；Last century
After the eighties, digital technology is increasingly mature, and not only function signal generator development is digit synthesis arbitrarily signal generating device, radio frequency
Signal generator also produces revolutionary change；So far from the nineties in last century, international major company constantly releases a plurality of
High performance radio-frequency signal generator, so that the indices of signal generator have further raising.
Since domestic signal generator development time is short, basic device and key technology accumulation are insufficient, in face of increasingly
Widened signal generator market, Chinese products lack strong core competitiveness.The reality planned with " made in China 2025 "
It applies, basic device field will necessarily attract the development of a new round.Wherein, signal generator is used as and can be used for automatically controlling, navigate
The high-accuracy basic instrument of the scientific experiment of many aspects such as empty space flight, geophysics, scientific experiment and engineering manufacture, acts as work
The signal generator that applied widely, index accuracy is high, overall cost is low has only been grasped in the effect of Cheng Jishi, could allow me
Scientific research and engineering more efficiently, it is convenient.
Existing domestic signal generator, such as function signal generator is since the signal frequency of generation is relatively narrow, does not have
Complicated modulation capability, and it is cumbersome, with high costs, therefore it is unable to satisfy the demand of existing scientific experiment and engineering manufacture.
In view of this, it is necessory to provide a kind of new signal generator, to solve the above problems.
Summary of the invention
The purpose of the present invention is to provide a kind of radio-frequency signal generator wide with radio frequency width, modulation function is powerful,
To facilitate synthesis, the modulation of high-frequency signal, it is easy to use and safeguards.
For achieving the above object, the present invention provides a kind of Vector Modulation radio-frequency signal generators, comprising:
RF local oscillator module: for generating wide band radio-frequency local oscillation signal；
Vector Modulation module: for generating radio frequency orthogonal local oscillation signal and base band amplified signal, including radio frequency I/Q modulation mould
Module occurs for block and the phase-locked loop module connecting respectively with the radio frequency I/Q modulation module and baseband signal；
Rf conversion module: connecting with the RF local oscillator module, Vector Modulation module respectively, is used for wide band radio-frequency sheet
Vibration signal and radio frequency orthogonal local oscillation signal carry out hybrid modulation, to generate high frequency output signal；
Broadband fixed ampllitude module: connecting with the rf conversion module, the automatic gain control including being provided with broadband detector
Circuit processed, the broadband fixed ampllitude module is for receiving and processing the high frequency output signal, to form amplitude stabilization, controllable height
Frequency fixed ampllitude signal；
Output module: connecting with the Vector Modulation module and the broadband fixed ampllitude module respectively, including output switch and
Attenuator, base band amplified signal and high frequency fixed ampllitude signal of the output switch for will receive are mixed, are penetrated with generating
Frequency output signal, the attenuator obtain the radiofrequency signal through Vector Modulation for radio frequency output signal to be decayed.
As a further improvement of the present invention, the RF local oscillator module includes low-noise voltage-controlled oscillator, is used in combination
By the monocycle fractional frequency division Phase Lock Technique of number optimization, to obtain the wide band radio-frequency sheet of high frequency resolution, low phase noise
Shake signal.
As a further improvement of the present invention, module occurs for the baseband signal for generating the base band with Vector Modulation
Local oscillation signal, including FPGA and digital analog converter, the FPGA include FM channel, phase modulation channel and the modulation of three kinds of amplitude modulation channel
Channel.
As a further improvement of the present invention, the FPGA further includes modulation memory, external data selector, external tune
Rate generator processed and multiple selector, the modulation memory are connect to receive the modulation number of outer CPU sending with outer CPU
According to, the outer CPU controls the modulation memory with direct memory access mode, and outer CPU enjoy control it is excellent
First weigh；The external data selector and external modulation rate generator identify the information source of modulation data；It is described
Modulation data is divided into three tunnels and is transferred in the FM channel, phase modulation channel and amplitude modulation channel respectively by multiple selector to be carried out
Modulation.
As a further improvement of the present invention, the digital analog converter is with the input of high-performance mono-/bis-channel, Orthogonal Double
The high-speed A/D converter of road output, and the high-speed AD converter has 16 bit resolutions.
As a further improvement of the present invention, it further includes external modulation unit that module, which occurs, for the baseband signal, for
The FPGA inputs analog audio signal；The external modulation unit includes audio automatic gain control amplifier, audio A/D
Converter and rate multiplier, the audio automatic gain control amplifier is used to receive and amplified analog audio signal, and will
Amplified analog audio signal, which is transferred in audio A/D converter, carries out branch process, and analog audio signal passes through institute all the way
Rate multiplier is stated into the FM channel and/or phase modulation channel；Another way analog audio signal is directly entered amplitude modulation channel.
As a further improvement of the present invention, the audio automatic gain control amplifier is using field-effect tube as audio
Electrically controlled attenuator, so that the lower limit working frequency of the audio automatic gain control amplifier reaches 10Hz.
As a further improvement of the present invention, the phase-locked loop module is connect with the radio frequency I/Q modulation module, the lock
Phase ring moulds block is monolithic phase-locked loop chip, for generating radio frequency reference signal, and passes to the radio frequency I/Q modulation module；Institute
Radio frequency I/Q modulation module is stated for the base band that module generates to be occurred by the baseband signal for the radio frequency reference signal and part
Local oscillation signal is modulated, to obtain radio frequency orthogonal local oscillation signal.
As a further improvement of the present invention, the rf conversion module include SAW filter, broadband mixer,
Low-pass filter and broad band amplifier.
As a further improvement of the present invention, the broadband fixed ampllitude module further includes setting in the automatic growth control electricity
Integrator, radio frequency electrically adjusted attenuator, automatic gain control amplifier, high gain wideband amplifier in road.
The beneficial effects of the present invention are: Vector Modulation radio-frequency signal generator of the invention passes through setting Vector Modulation module
And rf conversion module and broadband fixed ampllitude module with Vector Modulation module cooperation, on the one hand realize radio frequency orthogonal sheet
Frequency is moved in vibration signal and base band amplified signal, while remaining the mould of radio frequency orthogonal local oscillation signal and base band amplified signal
The function of quasi- modulation and digital modulation；On the other hand, mixed modulated is carried out to multiple signals, effectively improves vector tune of the present invention
The output frequency width for the radiofrequency signal that radio-frequency signal generator processed generates, so that Vector Modulation radiofrequency signal of the invention occurs
Device is easy to use, simple suitable for practical and low in cost.
Detailed description of the invention
Fig. 1 is the module diagram of Vector Modulation radio-frequency signal generator of the present invention.
Fig. 2 is the structural schematic diagram of Vector Modulation radio-frequency signal generator of the present invention.
Fig. 3 is the working principle diagram of FPGA.
Fig. 4 is the structural schematic diagram of digital analog converter AD9777.
Fig. 5 is the working principle diagram of external modulation unit.
Fig. 6 is the modulation principle figure of radio frequency I/Q modulator.
Fig. 7 is the loop circuit figure of automatic gain control circuit.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, right in the following with reference to the drawings and specific embodiments
The present invention is described in detail.
Refering to Figure 1, present invention discloses a kind of Vector Modulation radio-frequency signal generator 100, the Vector Modulation
Radio-frequency signal generator 100 includes RF local oscillator module 1, Vector Modulation module 2, rf conversion module 3, broadband fixed ampllitude module 4
And output module 5, to generate radiofrequency signal of the frequency range from audio to radio frequency, and the radiofrequency signal is differentiated with high-frequency
The characteristics of rate, low phase noise.
The RF local oscillator module 1 is for generating wide band radio-frequency local oscillation signal, in the present invention, the RF local oscillator module
1 includes low-noise voltage-controlled oscillator (VCO), and using the monocycle fractional frequency division Phase Lock Technique by number optimization, so that producing
Raw wide band radio-frequency local oscillation signal has the characteristics that high frequency resolution, low phase noise.
The Vector Modulation module 2 is for generating radio frequency orthogonal local oscillation signal and base band amplified signal.Specifically, at this
Vector Modulation module described in invention 2 includes that module 21, phase-locked loop module 22 and radio frequency I/Q modulation module occur for baseband signal
23。
The baseband signal occurs module 21 and is used to generate the base band local oscillation signal with Vector Modulation, further, institute
Stating baseband signal module 21 occurs includes field programmable gate array (FPGA) and digital analog converter (DAC), the baseband signal
Module 21 occurs during the work time, modulated signal initially enters the FPGA, is then modulated in the FPGA, finally
Base band local oscillation signal is exported by DAC.
It please referring to shown in Fig. 3, the FPGA is equipped with FM channel, phase modulation channel and three kinds of amplitude modulation channel modulation channels, and
The FPGA further includes modulation memory (MOD SRAM), external data selector, external modulation rate generator and multichannel choosing
Select device, wherein the modulation memory is connect with outer CPU, to receive the modulation data of outer CPU sending, the outer CPU
The modulation memory is controlled with direct memory access mode (DMA), and outer CPU enjoys control priority；It is described
External data selector and external modulation rate generator, and will be after identifications for identifying to the information source of modulation data
Modulation data three tunnels are divided by the multiple selector and to be transferred to the FM channel, phase modulation channel and amplitude modulation respectively logical
It is modulated in road.
Further, it further includes external modulation unit (as shown in Figure 4) that module 21, which occurs, for the baseband signal, is used for institute
State FPGA input analog audio signal；Specifically, the external modulation unit includes audio automatic gain control amplifier, sound
Frequency analog-digital converter and rate multiplier, the audio automatic gain control amplifier is for receiving and amplified analog audio letter
Number, and amplified analog audio signal is transferred in audio A/D converter and carries out branch process, analogue audio frequency is believed all the way
Number by the rate multiplier enter the FM channel or phase modulation channel；Another way analog audio signal is directly entered tune
Width channel.
In fact, since common automatic gain control amplifier chip lower frequency limit cannot reach audio range,
In the present invention, the audio automatic gain control amplifier uses field-effect tube as audio electrically controlled attenuator, so that described
The lower limit working frequency of audio automatic gain control amplifier reaches 10Hz.
Please referring to the external modulation unit shown in Fig. 5, the specific working principle is as follows: external modulation audio signal input warp
Cross R1, C1 input circuit isolated DC componentThen audio amplification is carried out；Audio amplification output is on the one hand
Audio A/D converter is reached, the DC voltage of input signal is on the other hand detected by wave detector, this DC voltage is used
In the conducting resistance of control field-effect tube.If DC voltage is excessive, actually enter as biggish negative voltage, field-effect tube conducting
Resistance is larger；If DC voltage is smaller, actually entering as lesser negative voltage, field-effect tube conducting resistance is smaller at this time, from
And the amplification factor of audio-frequency amplifier is controlled, stable output amplitude is realized, in addition, adjustable by field-effect tube offer one
Reference voltage can change the reference potential of integrator, realize the fine adjustment of output amplitude, simulation be furthermore achieved
Audio signal output amplitude is controllable.
Specifically, for the FPGA when being modulated to modulated signal, outer CPU calculates required word length first
For 32 modulation datas, it is placed in modulation memory according to certain rule；When modulation occurs, the modulation in memory is modulated
Data are output to external data selector according to certain modulation rate and carry out information identification, and are further transferred to the multichannel
Selector carries out branch, FM channel, phase modulation channel and amplitude modulation channel is respectively enterd, to carry out frequency, phase and amplitude respectively
Modulation.
It should be noted that the modulation rate of the modulation data in modulation memory is carried out by external modulation rate generator
Control, and in an embodiment of the present invention, it is only illustrated so that the word length of the modulation data is 32 as an example, exists certainly
In other embodiments, the word length of the modulation data of outer CPU processing, can according to the different modulation function of user setting and
Modulation parameter is adjusted so that the baseband signal occur module 21 can realize FM, FSK, QFSK, CHIRP, PSK,
The Different Modulations such as BPSK, QPSK, AM, ASK, QAM, to promote the suitable of Vector Modulation radio-frequency signal generator 100 of the present invention
Use range.
In frequency modulation(PFM) process, by taking FM as an example (FSK, QFSK, CHIRP are similar therewith), outer CPU exports 32 centers
Frequency control word removes C/F register, is added with 32 FM data of modulation memory output, and output result enters phase accumulator,
Therefore realization of High Speed frequency Fast transforms finally export FM signal by searching for wave memorizer data (sine table)；Continuous
(without any modulation) in the state of wave, then modulation data is 0, and the sine wave freuqency of FPGA output at this time is i.e. by C/F register
Data control.
In phase-modulation process, by taking PM as an example (PSK, QPSK are similar therewith), outer CPU exports 12 phase offset controls
Word processed removes PO register, is added with 12 PM data of modulation memory output, output result enters phase addition device, therefore high
Speed realizes phase Fast transforms；(without any modulation) in the state of continuous wave, then modulation data is 0, and FPGA is exported at this time
Sine wave phase be by PO register data control.
In amplitude modulation process, by taking AM as an example (ASK, QAM are similar therewith), outer CPU exports 12 amplitude control words
AMP register is removed, is added with 12 AM data of modulation memory output, output result enters amplitude multiplier, therefore high speed
Realization amplitude Fast transforms；(without any modulation) in the state of continuous wave, then modulation data is 0, FPGA output at this time
Sinusoidal amplitude is to be controlled by the data of AMP register.
Modulated modulation data, into being converted in the digital analog converter (DAC), in the present invention, the number
Mode converter using 16,160MSPS, 2x/4x/8x interpolation, binary channels TxDAC analog-digital chip AD9777, i.e., this
In invention, the modulated signal that the FPGA control generates is sent into AD9777 via after serioparallel exchange, since AD9777 provides list
End/Differential Input, in the present embodiment, to save the method that data line simplifies structure, therefore uses single ended input, input one
Road modulated signal (AD0~AD15), the reference clock signal of a 40MHz add to the clock of AD9777 after radio-frequency transformer
Input terminal generates the orthogonal output of two-way, i.e. base band local oscillation signal, and the base band local oscillation signal packet by the processing of chip interior
Include the i.e. road I signal and the road Q signal.
The baseband signal occurs module 21 and is additionally provided with baseband low pass filters and base band output amplifier, the base band sheet
Base band local oscillation signal of the signal intermediate frequency rate of shaking between 100Hz~40MHz passes sequentially through the baseband low pass filters and base band
Output amplifier generates base band amplified signal, and is sent into output module 5, and frequency is in 20~40MHz in base band local oscillation signal
Between base band local oscillation signal then enter in radio frequency I/Q modulation module 23 and be further processed.
The phase-locked loop module 22 and the radio frequency I/Q modulation module 23 connection, the phase-locked loop module 22 are monolithic lock
Phase ring core piece for generating radio frequency reference signal, and passes to the radio frequency I/Q modulation module 23；The radio frequency I/Q modulates mould
Block 23 is used to occur the radio frequency reference signal and baseband signal the frequency that module generates to be believed in the base band local oscillator of 20~40MHz
It number is modulated, to obtain radio frequency orthogonal local oscillation signal.
The rf conversion module 3 is connect with the RF local oscillator module 1, Vector Modulation module 2 respectively, is used for broadband
RF local oscillator signal and radio frequency orthogonal local oscillation signal carry out hybrid modulation, to generate high frequency output signal.Specifically, in this hair
In bright, the phase-locked loop module 22, the radio frequency I/Q modulation module 23 and the rf conversion module 3 cooperate.
It please refers to shown in Fig. 6, the radio frequency I/Q modulation module 23 is to radio frequency reference signal and 20~40MHz base band sheet
When vibration signal is modulated, the radio frequency I/Q modulation module 23 utilizes the same phase reference carrier Acos α of radio frequency reference signal0T and
Orthogonal reference carrier wave Asin α0T is respectively and the same as phase and orthogonal two-way baseband output signalWithIt is multiplied, is then added and asks
With to get to send radio frequency orthogonal local oscillation signal (carrier wave keying signal r (t)).Further, in radio frequency orthogonal local oscillation signal
The road I signal and the road Q signal, first filter, then be mixed with wide band radio-frequency local oscillation signal by low-pass filter respectively,
In, the road I signal is mixed with prime minister with the wide band radio-frequency local oscillation signal after 90 ゜ of carrier phase, then is believed with wide band radio-frequency local oscillator
Number carrier wave is added, and the purpose of addition is that carrier wave inhibits；Further, the road Q signal is directly carried out with wide band radio-frequency local oscillation signal
Mixing, then be added with the wide band radio-frequency local oscillation signal after 90 degree of carrier phase；Finally, by the road I signal and the road Q signal phase
Add, then realize high-performance I/Q modulation, generate high frequency output signal, in the present invention, the wide band radio-frequency local oscillation signal is frequency
Hyperfrequency reference signal of the rate in 885MHz.
The broadband fixed ampllitude module 4 is connect with the rf conversion module 3, the automatic increasing including being provided with broadband detector
Beneficial control circuit (as shown in Figure 7), it is steady for receiving the high frequency output signal and handling generation amplitude stabilization, controllable high frequency
Width signal；Further, the broadband fixed ampllitude module 4 further includes the power distribution being arranged in the automatic gain control circuit
Device, integrator, radio frequency electrically adjusted attenuator, automatic gain control amplifier and high gain wideband amplifier.
Specifically, the high frequency output signal of the output through the broad band amplifier in rf conversion module 3, through overpower point
Orchestration is connected in broadband detector, and the output voltage of integrator goes to control the electrically controlled attenuator, completes high frequency output signal
Fixed ampllitude adjust, further, in the present invention, the electrically controlled attenuator is the electrically controlled attenuator being made of PIN diode, such as
This setting, so that the automatic gain control circuit can both carry out temperature-compensating to broadband detector, while can be to passing through electronics
The time constant of switching broadband detector.
In fact, due in broadband detector detector diode working characteristics be affected by temperature obviously, ought make merely
When with broadband detector output signal, temperature has a significant impact to the accuracy of the amplitude of signal.For this purpose, being arranged in the present invention
Two-way contrary detector diode DS1, DS2, are respectively connected to ± 5V supply voltage and series resistance, temperature is to inspection at this time
The influence of wave diode drop so that two-way generation+Δ U and-Δ U respectively deviation, be added and offset, to improve broadband demodulation
The accuracy of device.Further, different capacitor C is added using electronic switch in integratori, the time constant of integrator is controlled,
So set, can effectively avoid the wave detector when input signal is modulated signal detects envelope signal, then must assure thatWherein fminFor the low-limit frequency of modulated signal.Since this product frequency modulating signal range is quite big, one
Fixed capacitor CiIt is not able to satisfy all requirements, therefore by using several different electricity of outer CPU control electronic switch switching
The method of appearance, it is ensured that pickup time constant is in the reasonable scope.
The output module 5 is connect with the Vector Modulation module 2 and the broadband fixed ampllitude module 4 respectively, including output
Switch and attenuator, the output switch generate radio frequency for receiving base band amplified signal and high frequency fixed ampllitude signal and carrying out mixing
Output signal, and decayed by the attenuation module, obtain the radiofrequency signal through Vector Modulation.Further, in this hair
In bright, the attenuator is 110dB attenuator, and the 110dB attenuator gain 10dB stepping is adjustable.
In conclusion Vector Modulation radio-frequency signal generator 100 of the invention by setting Vector Modulation module 2 and with
The rf conversion module 3 and broadband fixed ampllitude module 4 that the Vector Modulation module 2 is equipped with, on the one hand realize radio frequency orthogonal
Frequency is moved in local oscillation signal and base band amplified signal, while remaining radio frequency orthogonal local oscillation signal and base band amplified signal
The function of analog-modulated and digital modulation；On the other hand, mixed modulated is carried out to multiple signals, effectively improves vector of the present invention
The output frequency width for the radiofrequency signal that modulated radio signal generator generates, so that Vector Modulation radiofrequency signal of the invention is sent out
Raw device is suitable for practical and low in cost simple and easy to use.
The above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to preferred embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that, it can modify to technical solution of the present invention
Or equivalent replacement, without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. a kind of Vector Modulation radio-frequency signal generator characterized by comprising
RF local oscillator module: for generating wide band radio-frequency local oscillation signal；
Vector Modulation module: for generate radio frequency orthogonal local oscillation signal and base band amplified signal, including radio frequency I/Q modulation module with
And module occurs for the phase-locked loop module and baseband signal connecting respectively with the radio frequency I/Q modulation module；
Rf conversion module: connecting with the RF local oscillator module, Vector Modulation module respectively, for believing wide band radio-frequency local oscillator
Number and radio frequency orthogonal local oscillation signal carry out hybrid modulation, to generate high frequency output signal；
Broadband fixed ampllitude module: connecting with the rf conversion module, the automatic growth control electricity including being provided with broadband detector
Road, the broadband fixed ampllitude module are steady to form amplitude stabilization, controllable high frequency for receiving and processing the high frequency output signal
Width signal；
Output module: connecting with the Vector Modulation module and the broadband fixed ampllitude module respectively, including output switch and decaying
Device, base band amplified signal and high frequency fixed ampllitude signal of the output switch for will receive are mixed, defeated to generate radio frequency
Signal out, the attenuator obtain the radiofrequency signal through Vector Modulation for radio frequency output signal to be decayed.
2. Vector Modulation radio-frequency signal generator according to claim 1, it is characterised in that: the RF local oscillator module packet
Low-noise voltage-controlled oscillator is included, the monocycle fractional frequency division Phase Lock Technique by number optimization is used in combination, to obtain high-frequency point
The wide band radio-frequency local oscillation signal of resolution, low phase noise.
3. Vector Modulation radio-frequency signal generator according to claim 1, it is characterised in that: mould occurs for the baseband signal
Block is used to generate the base band local oscillation signal with Vector Modulation, including FPGA and digital analog converter, and the FPGA includes that frequency modulation is logical
Road, phase modulation channel and three kinds of amplitude modulation channel modulation channels.
4. Vector Modulation radio-frequency signal generator according to claim 3, it is characterised in that: the FPGA further includes modulation
Memory, external data selector, external modulation rate generator and multiple selector, the modulation memory and outer CPU
Connection is to receive the modulation data that outer CPU issues, and the outer CPU is with direct memory access mode to the modulation memory
It is controlled, and outer CPU enjoys control priority；The external data selector and external modulation rate generator for pair
The information source of modulation data is identified；Modulation data is divided into three tunnels and is transferred to the tune respectively by the multiple selector
It is modulated in frequency channel, phase modulation channel and amplitude modulation channel.
5. Vector Modulation radio-frequency signal generator according to claim 3, it is characterised in that: the digital analog converter is tool
There is the high-speed A/D converter of the input of high-performance mono-/bis-channel, Quadrature double path output, and the high-speed AD converter has 16
Bit resolution.
6. Vector Modulation radio-frequency signal generator according to claim 3, it is characterised in that: mould occurs for the baseband signal
Block further includes external modulation unit, for inputting analog audio signal to the FPGA；The external modulation unit includes audio
Automatic gain control amplifier, audio A/D converter and rate multiplier, the audio automatic gain control amplifier are used for
Reception and amplified analog audio signal, and amplified analog audio signal is transferred in audio A/D converter and carries out branch
Processing, analog audio signal enters the FM channel and/or phase modulation channel by the rate multiplier all the way；Another way mould
Quasi- audio signal is directly entered amplitude modulation channel.
7. Vector Modulation radio-frequency signal generator according to claim 6, it is characterised in that: the audio automatic gain control
Amplifier processed uses field-effect tube as audio electrically controlled attenuator, so that the lower limit work of the audio automatic gain control amplifier
Working frequency reaches 10Hz.
8. Vector Modulation radio-frequency signal generator according to claim 3, it is characterised in that: the phase-locked loop module and institute
The connection of radio frequency I/Q modulation module is stated, the phase-locked loop module is monolithic phase-locked loop chip, for generating radio frequency reference signal, and
Pass to the radio frequency I/Q modulation module；The radio frequency I/Q modulation module is used for the radio frequency reference signal and part by institute
It states the base band local oscillation signal that baseband signal generation module generates to be modulated, to obtain radio frequency orthogonal local oscillation signal.
9. Vector Modulation radio-frequency signal generator according to claim 1, it is characterised in that: the rf conversion module packet
Include SAW filter, broadband mixer, low-pass filter and broad band amplifier.
10. Vector Modulation radio-frequency signal generator according to claim 1, it is characterised in that: the broadband fixed ampllitude module
Further include the integrator being arranged in the automatic gain control circuit, radio frequency electrically adjusted attenuator, automatic gain control amplifier,
High gain wideband amplifier.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110113278A (en) * | 2019-04-30 | 2019-08-09 | 杭州电子科技大学 | A kind of Modulation Mode Recognition method based on all-digital receiver |
| CN112468422A (en) * | 2020-11-13 | 2021-03-09 | 中国航空综合技术研究所 | TDM-based dynamic radio frequency switching system and method for vector signal generator |
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| CN110113278A (en) * | 2019-04-30 | 2019-08-09 | 杭州电子科技大学 | A kind of Modulation Mode Recognition method based on all-digital receiver |
| CN110113278B (en) * | 2019-04-30 | 2021-06-29 | 杭州电子科技大学 | Modulation mode identification method based on all-digital receiver |
| CN112468422A (en) * | 2020-11-13 | 2021-03-09 | 中国航空综合技术研究所 | TDM-based dynamic radio frequency switching system and method for vector signal generator |
| CN112468422B (en) * | 2020-11-13 | 2023-05-05 | 中国航空综合技术研究所 | TDM-based vector signal generator radio frequency dynamic switching system and switching method |
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