CN112532237A - Portable adjustable frequency source device - Google Patents
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- CN112532237A CN112532237A CN202011295194.4A CN202011295194A CN112532237A CN 112532237 A CN112532237 A CN 112532237A CN 202011295194 A CN202011295194 A CN 202011295194A CN 112532237 A CN112532237 A CN 112532237A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/0802—Details of the phase-locked loop the loop being adapted for reducing power consumption
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/0805—Details of the phase-locked loop the loop being adapted to provide an additional control signal for use outside the loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
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Abstract
The invention relates to a portable adjustable frequency source device, comprising: the controller, the crystal oscillator, the frequency synthesizer, multistage filter circuit, amplifier and output terminal, the output of crystal oscillator is connected with the first input electricity of frequency synthesizer, the output of controller is connected with the second input electricity of frequency synthesizer, the output of frequency synthesizer is connected with the input electricity of selection stage circuit, multistage filter circuit's output is connected with the input electricity of amplifier, the output and the output terminal electricity of amplifier are connected, output terminal is used for exporting the frequency modulation signal, multistage filter circuit includes a plurality of single-stage filter circuit, a plurality of single-stage filter circuit parallel connection, single-stage filter circuit includes first switch and low pass filter, first switch and low pass filter series connection. The invention has simple operation and convenient use, finally outputs signals with selected frequency through the shared output terminal, and realizes frequency modulation function by adopting fewer components, thereby being convenient for realizing miniaturized design and further being more portable.
Description
Technical Field
The invention relates to the field of signal frequency source design, in particular to a portable adjustable frequency source device.
Background
A signal source is a device that provides electrical signals of various frequencies, waveforms and output levels. The device is used as a signal source or an excitation source for testing when measuring amplitude characteristics, frequency characteristics, transmission characteristics and other electrical parameters of various telecommunication systems or telecommunication equipment and when measuring characteristics and parameters of components. The signal source has wide application in production practice and the technical field.
In the case of field commissioning of communication devices, one or several signal frequency sources are typically used. The mode of generating the reference frequency source generally is to carry a heavy signal source instrument, or design a module with single frequency output, or design a plurality of frequencies to be integrated on one module, but the module needs several output frequency channels, and is manually switched when different frequencies are actually used, or integrate several frequency generation modules on one module, so that the occupied area is large, and the miniaturization is not realized. The method brings great inconvenience to the actual debugging: the required equipment of external field test is more, and signal source equipment is limited, and the power supply is also inconvenient etc. and design single frequency output module will face the not enough problem of signal reference source under the different test scene circumstances, and the module design is too big also does not do benefit to the operation, and above-mentioned scheme more or less all can bring a lot of puzzlements for the external field debugging for the debugging becomes inconvenient.
Therefore, in order to solve the above problems, it is necessary to provide a portable adjustable frequency source device.
Disclosure of Invention
The invention aims to provide a portable adjustable frequency source device which has the characteristics of simple structure, low cost and convenient use, corresponding frequency is selected through the control of a controller and a switch, the operation is simple and convenient, signals with the selected frequency are finally output through a shared output terminal, and the frequency modulation function is realized by adopting fewer components, so that the miniaturization design is realized, and the portable adjustable frequency source device is more portable.
In order to achieve the purpose, the invention provides the following scheme:
a portable adjustable frequency source device, comprising: the output end of the crystal oscillator is electrically connected with the first input end of the frequency synthesizer, the output end of the controller is electrically connected with the second input end of the frequency synthesizer, the output end of the frequency synthesizer is electrically connected with the input end of the stage selection circuit, the output end of the multistage filter circuit is electrically connected with the input end of the amplifier, the output end of the amplifier is electrically connected with the output terminal, the output terminal is used for outputting frequency modulation signals, the multistage filter circuit comprises a plurality of single-stage filter circuits, the single-stage filter circuits are connected in parallel, each single-stage filter circuit comprises a first switch and a low-pass filter, and the first switch is connected with the low-pass filter in series.
Optionally, the frequency synthesizer further comprises a numerical control attenuator, an input end of the numerical control attenuator is electrically connected with an output end of the frequency synthesizer, an output end of the numerical control attenuator is electrically connected with an input end of the multistage filter circuit, and an output end of the controller is electrically connected with an input end of the numerical control attenuator.
Optionally, the single-stage filter circuit further includes a second switch, the first switch, the second switch and the low-pass filter are connected in series, and the first switch and the second switch are respectively connected to two ends of the low-pass filter.
Optionally, the amplifier further comprises a coupler and a detector, an input end of the coupler is electrically connected with an output end of the amplifier and an input end of the coupler, a first output end of the coupler is electrically connected with the output terminal, a second output end of the coupler is electrically connected with an input end of the detector, and an output end of the detector is electrically connected with an input end of the controller.
Optionally, the multi-stage filter circuit further comprises a switch controller, the switch controller is electrically connected with the plurality of first switches and the plurality of second switches in the multi-stage filter circuit, the switch controller is used for controlling on and off of the switches in the multi-stage filter circuit, and the switch controller is electrically connected with the controller.
Optionally, the adjustable frequency source device further comprises a power supply circuit and a USB power supply interface, wherein the USB power supply interface is electrically connected with the input end of the power supply circuit, the power supply circuit comprises a low dropout linear regulator, and the output end of the power supply circuit is used for providing a power supply for components in the adjustable frequency source device.
Optionally, the supply voltage at the input end of the power supply circuit is 5V.
Optionally, the system further comprises a control panel, the control panel is electrically connected with the controller, and the control panel is used for acquiring the target frequency information and sending the target frequency information to the controller.
Optionally, the output frequency range of the frequency synthesizer is 10MHz to 1344MHz, the operating bandwidth of the amplifier is DC to 1000MHz, and the gain is 16.5 db.
Optionally, the crystal oscillator is a constant temperature crystal oscillator or a temperature compensated crystal oscillator.
According to the specific embodiment provided by the invention, the invention has the following technical effects:
1) the invention provides a portable adjustable frequency source device, which has the characteristics of simple structure, low cost and convenient use, corresponding frequency is selected through the control of a controller and a switch, the operation is simple, the use is convenient, signals with the selected frequency are finally output through a shared output terminal, and the frequency modulation function is realized by adopting fewer components, so that the miniaturization design is convenient to realize and the device is more portable;
2) the power supply system is simple and has low power consumption, the power supply circuit is designed into a 5V power supply interface, so that the device can be conveniently powered, and the device can be powered by a portable power supply or a mobile phone adapter and the like and is more portable;
3) the frequencies of different frequency bands are processed by a segmented low-pass filter and then output by a unified channel of a dial switch at the next stage, and better harmonic indexes can be provided for each reference frequency required by a test system under the condition of not manually switching output channels;
4) through the numerical control attenuator, the coupler, the detector, the controllable first switch and the controllable second switch controlled by the switch controller, the characteristic of more frequency output can be realized, the output requirements of different powers in a certain range can also be met, and the controller controls and outputs a signal of a target frequency after the target frequency information is acquired through the control panel, so that the method is simpler and more convenient.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art it is also possible to derive other drawings from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a portable adjustable frequency source device according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a portable adjustable frequency source device according to embodiment 2 of the present invention.
Wherein the reference numerals in the figures correspond to:
the circuit comprises a 1-crystal oscillator, a 2-controller, a 3-frequency synthesizer, a 4-multistage filter circuit, a 41-first switch, a 42-low-pass filter, a 43-second switch, a 5-amplifier, a 6-numerical control attenuator, a 7-coupler, an 8-detector, a 9-output terminal, a 10-switch controller and a 11-control panel.
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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide a portable adjustable frequency source device which has the characteristics of simple structure, low cost and convenient use, corresponding frequency is selected through the control of a controller and a switch, the operation is simple and convenient, signals with the selected frequency are finally output through a shared output terminal, and the frequency modulation function is realized by adopting fewer components, so that the miniaturization design is realized, and the portable adjustable frequency source device is more portable.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1:
in this embodiment, referring to fig. 1, a portable frequency-adjustable source device includes a controller 2, a crystal oscillator 1, and a frequency synthesizer 3, the multi-stage frequency synthesizer comprises a multi-stage filter circuit 4, an amplifier 5 and an output terminal 9, wherein the output end of a crystal oscillator 1 is electrically connected with a first input end of a frequency synthesizer 3, the output end of a controller 2 is electrically connected with a second input end of the frequency synthesizer 3, the output end of the frequency synthesizer 3 is electrically connected with the input end of a stage selection circuit, the output end of the multi-stage filter circuit 4 is electrically connected with the input end of the amplifier 5, the output end of the amplifier 5 is electrically connected with the output terminal 9, the output terminal 9 is used for outputting frequency modulation signals, the multi-stage filter circuit 4 comprises a plurality of single-stage filter circuits, the single-stage filter circuits are connected in parallel, the single-stage filter circuit comprises a first switch 41 and a low-pass filter 42, and the. The portable adjustable frequency source device that this embodiment provided has simple structure, with low costs and convenient to use's characteristics, selects corresponding frequency through controller control and switch, and easy operation convenient to use finally exports the signal of selected frequency through the output terminal of sharing, realizes the frequency modulation function through adopting less components and parts and is convenient for realize miniaturized design and then more portable.
In the embodiment, the crystal oscillator 1 is a constant temperature crystal oscillator, and in other embodiments, a temperature compensation crystal oscillator can be selected under the condition that the performance meets the requirement, so that the cost is further reduced; the controller 2 adopts an 8-bit 51-core singlechip; the frequency synthesizer 3 adopts an LMX2571 chip of Texas Instruments, has wider output frequency, and can output the frequency range of 10 MHz-1344 MHz; the low-pass filter is an LC low-pass filter, and the filter circuit can be built through a discrete device capacitor inductor; the working bandwidth of the amplifier 5 is DC-1000 MHz, and the gain is 16.5 db. The frequency modulation function is realized by adopting fewer components, so that the miniaturized design is realized conveniently, the device is more portable, and the components with low cost are adopted, namely the whole device has the characteristic of low cost.
The power supply circuit comprises a low-dropout linear regulator, and the output end of the power supply circuit is used for providing a power supply for components in the adjustable frequency source device. The supply voltage at the input of the supply circuit is 5V. The invention adopts a low-dropout linear stabilized voltage power supply converter and a linear stabilized voltage power supply converter to convert the 5V of the system input power supply into different power supplies required in the circuit by adopting other power supplies which are widely applicable to the circuit design of the frequency source and powered by a 5V power supply, and a power supply interface of a Micro USB is reserved in the design, so that the invention can be compatible with most mobile power supply modes on the market, and has the advantages of concise power supply circuit design and smaller system power consumption.
Further, the device also comprises a control panel 11, the control panel 11 is electrically connected with the controller 2, and the control panel 11 is used for acquiring the target frequency information and sending the target frequency information to the controller 2. The operator can input the target frequency through the control panel 11, and the control panel 11 sends the target frequency signal to the controller 2. The controller 2 controls the frequency synthesizer 3 according to the target frequency information.
The working principle of the embodiment is as follows:
the crystal oscillator 1 is used for generating a reference frequency signal f1 of 10MHz and providing a reference source for the frequency synthesizer 3; the controller 2 is used for controlling the frequency synthesizer 3 to output a stable signal f2 according to the target frequency and the reference frequency signal f1 through a voltage-controlled oscillator and a phase-locked loop in the frequency synthesizer; the multistage filter circuit 4 is used for filtering the stable signal f2 to obtain a signal f3 with high harmonic suppression degree, the multistage filter circuit selects a channel corresponding to a target frequency through a first switch, namely a low-pass filter corresponding to the target frequency is selected, and the low-pass filter is used for filtering the harmonic of the stable signal f 2; the signal f3 with a high harmonic suppression degree is amplified without distortion by the amplifier 5 to obtain an output signal fout with a target frequency having a good index, and the output signal fout is output through the output terminal 9.
Example 2:
a portable adjustable frequency source device comprises a controller 2, a crystal oscillator 1, a frequency synthesizer 3, a multistage filter circuit 4, an amplifier 5 and an output terminal 9, wherein the output end of the crystal oscillator 1 is electrically connected with the first input end of the frequency synthesizer 3, the output end of the controller 2 is electrically connected with the second input end of the frequency synthesizer 3, the output end of the frequency synthesizer 3 is electrically connected with the input end of a stage selection circuit, the output end of the multistage filter circuit 4 is electrically connected with the input end of the amplifier 5, the output end of the amplifier 5 is electrically connected with the output terminal 9, the output terminal 9 is used for outputting frequency modulation signals, the multistage filter circuit 4 comprises a plurality of single-stage filter circuits which are connected in parallel, each single-stage filter circuit comprises a first switch 41 and a low-pass filter 42, and the first switch 41 is connected with the low-pass filter 42 in series.
Further, as shown in fig. 2, the digital control attenuator 6 is further included, an input end of the digital control attenuator 6 is electrically connected with an output end of the frequency synthesizer 3, an output end of the digital control attenuator 6 is electrically connected with an input end of the multistage filter circuit 4, and an output end of the controller 2 is electrically connected with an input end of the digital control attenuator 6. The digitally controlled attenuator 6 is disposed after the frequency synthesizer 3 and is used for controlling the signal magnitude of the stable signal f2 output by the frequency synthesizer 3. By adding the numerical control attenuator 6, the design of more frequencies can be adapted, a plurality of single-stage filter circuits can be conveniently added on the premise of not influencing the quality of output signals,
further, the single-stage filter circuit further includes a second switch 43, the first switch 41, the second switch 43 and the low-pass filter 42 are connected in series, and the first switch 41 and the second switch 43 are respectively connected to two ends of the low-pass filter 42. The low-pass filter corresponding to the target frequency is switched on by closing the first switch 41 and the second switch 43 in the same single-stage filter circuit, and the low-pass filter corresponding to the target frequency is not selected due to switch control errors through double-switch setting, so that the output signal with a better index cannot be obtained finally. In the embodiment, a multi-section filter is added for harmonic suppression of output frequency, a dial switch is adopted for switching a gating switch of the filter, the required frequency is selected through key switching under the control of a controller, and then the dial switch of the next stage shares one output channel, so that the harmonic index of an output signal is better, and the use is more convenient.
Further, the amplifier further comprises a coupler 7 and a detector 8, wherein an input end of the coupler 7 is electrically connected with an output end of the amplifier 5 and an input end of the coupler 7, a first output end of the coupler 7 is electrically connected with the output terminal 9, a second output end of the coupler 7 is electrically connected with an input end of the detector 8, and an output end of the detector 8 is electrically connected with an input end of the controller 2. The coupler 7 couples a small part of signals output by the amplifier 5 to the detector 8, the detector 8 receives the small part of signals coupled by the coupler 7 and converts the small part of signals into voltage signals to feed back to the controller 2, and the controller 2 controls the frequency synthesizer 3 and the numerical control attenuator 6 according to the voltage signals fed back by the detector.
The power supply circuit comprises a low-dropout linear regulator, and the output end of the power supply circuit is used for providing a power supply for components in the adjustable frequency source device. The supply voltage at the input of the supply circuit is 5V. The invention adopts a low-dropout linear stabilized voltage power supply converter and a linear stabilized voltage power supply converter to convert the 5V of the system input power supply into different power supplies required in the circuit by adopting other power supplies which are widely applicable to the circuit design of the frequency source and powered by a 5V power supply, and a power supply interface of a Micro USB is reserved in the design, so that the invention can be compatible with most mobile power supply modes on the market, and has the advantages of concise power supply circuit design and smaller system power consumption.
Further, a switch controller 10 is included, the switch controller 10 is electrically connected to the plurality of first switches 41 and the plurality of second switches 43 in the multistage filter circuit 4, the switch controller 10 is configured to control on/off of the switches in the multistage filter circuit 4, and the switch controller 10 is electrically connected to the controller 2. The specific connection relationship of the switch controller 10 and the plurality of first switches 41 and second switches 42 is not shown in the drawing. The plurality of first switches 41 and the plurality of second switches 42 in the multistage filtering circuit 4 are controlled by the switch controller 10. The controller 2 sends a control signal to the switch controller 10 according to the single-stage filter circuit where the low-pass filter corresponding to the target frequency is located, the switch controller 10 controls the first switch and the second switch in the single-stage filter circuit to be closed according to the single-stage filter circuit information of the control signal, and the controller controls the on-off of the first switch and the second switch, so that the operation of an operator is simpler and more convenient.
Further, in the present embodiment, the present invention further includes a control panel 11, the control panel 11 is electrically connected to the controller 2, and the operator can input the target frequency through the control panel 11, and the control panel 11 sends the target frequency signal to the controller 2.
The working principle of the embodiment is as follows:
the crystal oscillator 1 is used for generating a reference frequency signal f1 of 10MHz and providing a reference source for the frequency synthesizer 3; the controller 2 is used for controlling the frequency synthesizer 3 to output a stable signal f2 according to the target frequency and the reference frequency signal f1 through a voltage-controlled oscillator and a phase-locked loop in the frequency synthesizer; the numerical control attenuator 6 is arranged behind the frequency synthesizer 3 and used for controlling the signal size of the stable signal f2 output by the frequency synthesizer 3 to obtain a signal f 3; the multistage filter circuit 4 is used for filtering the signal f3 to obtain a signal f4 with high harmonic suppression degree, the multistage filter circuit selects a channel corresponding to a target frequency through a first switch, namely a low-pass filter corresponding to the target frequency is selected, and the low-pass filter is used for filtering the harmonic of the stable signal f 3; amplifying the signal f4 with high harmonic suppression degree by an amplifier 5 without distortion to obtain a target frequency signal f5 with better index; the coupler 7 couples a small part of the signal f6 to the detector 8 for the signal f5 output by the amplifier 5, and the rest of the signal is output as an output signal fout through an output terminal 9; the detector 8 receives a small part of the signal f6 coupled by the coupler 7, converts the signal into a voltage signal and feeds the voltage signal back to the controller 2, and the controller 2 controls the frequency synthesizer 3, the numerical control attenuator 6 and the plurality of first switches 41 and the plurality of second switches 43 in the multistage filter circuit 4 according to the voltage signal fed back by the detector.
The digital controlled attenuator 6, the coupler 7, the detector 8, the controllable first switch 41 and the controllable second switch 43 controlled by the switch controller 10 are designed, so that the characteristics of more frequency output can be realized, the output requirements of different powers in a certain range can be met, and the controller 2 is used for controlling the frequency after the control panel 11 acquires the target frequency information, so that the frequency control is simpler and more convenient.
The above embodiment has the following technical effects:
1) the invention provides a portable adjustable frequency source device, which has the characteristics of simple structure, low cost and convenient use, corresponding frequency is selected through the control of a controller and a switch, the operation is simple, the use is convenient, signals with the selected frequency are finally output through a shared output terminal, and the frequency modulation function is realized by adopting fewer components, so that the miniaturization design is convenient to realize and the device is more portable;
2) the power supply system is simple and has low power consumption, the power supply circuit is designed into a 5V power supply interface, so that the device can be conveniently powered, and the device can be powered by a portable power supply or a mobile phone adapter and the like and is more portable;
3) the frequencies of different frequency bands are processed by a segmented low-pass filter and then output by a unified channel of a dial switch at the next stage, and better harmonic indexes can be provided for each reference frequency required by a test system under the condition of not manually switching output channels;
4) through the numerical control attenuator, the coupler, the detector, the controllable first switch and the controllable second switch controlled by the switch controller, the characteristic of more frequency output can be realized, the output requirements of different powers in a certain range can also be met, and the controller controls and outputs a signal of a target frequency after the target frequency information is acquired through the control panel, so that the method is simpler and more convenient.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A portable adjustable frequency source device is characterized by comprising a controller (2), a crystal oscillator (1), a frequency synthesizer (3), a multi-stage filter circuit (4), an amplifier (5) and an output terminal (9), wherein the output end of the crystal oscillator (1) is electrically connected with a first input end of the frequency synthesizer (3), the output end of the controller (2) is electrically connected with a second input end of the frequency synthesizer (3), the output end of the frequency synthesizer (3) is electrically connected with the input end of a stage selection circuit, the output end of the multi-stage filter circuit (4) is electrically connected with the input end of the amplifier (5), the output end of the amplifier (5) is electrically connected with the output terminal (9), the output terminal (9) is used for outputting frequency modulation signals, and the multi-stage filter circuit (4) comprises a plurality of single-stage filter circuits, the plurality of single-stage filter circuits are connected in parallel, the single-stage filter circuit includes a first switch (41) and a low-pass filter (42), and the first switch (41) is connected in series with the low-pass filter (42).
2. The portable adjustable frequency source device according to claim 1, further comprising a numerical control attenuator (6), wherein an input end of the numerical control attenuator (6) is electrically connected with an output end of the frequency synthesizer (3), an output end of the numerical control attenuator (6) is electrically connected with an input end of the multistage filter circuit (4), and an output end of the controller (2) is electrically connected with an input end of the numerical control attenuator (6).
3. A portable adjustable frequency source device according to claim 1, wherein the single-stage filter circuit further comprises a second switch (43), the first switch (41), the second switch (43) and the low-pass filter (42) are connected in series, and the first switch (41) and the second switch (43) are respectively connected to two ends of the low-pass filter (42).
4. A portable adjustable frequency source device according to claim 1, further comprising a coupler (7) and a detector (8), wherein an input of the coupler (7) is electrically connected to an output of the amplifier (5) and an input of the coupler (7), a first output of the coupler (7) is electrically connected to the output terminal (9), a second output of the coupler (7) is electrically connected to an input of the detector (8), and an output of the detector (8) is electrically connected to an input of the controller (2).
5. A portable adjustable frequency source device according to claim 3, further comprising a switch controller (10), wherein the switch controller (10) is electrically connected with a plurality of the first switches (41) and a plurality of the second switches (43) in the multistage filtering circuit (4), the switch controller (10) is used for controlling the on-off of the switches in the multistage filtering circuit (4), and the switch controller (10) is electrically connected with the controller (2).
6. The portable adjustable frequency source device according to claim 1, further comprising a power supply circuit and a USB power supply interface, wherein the USB power supply interface is electrically connected to an input terminal of the power supply circuit, the power supply circuit includes a low dropout regulator, and an output terminal of the power supply circuit is used to provide a power supply for components in the adjustable frequency source device.
7. The portable adjustable frequency source device according to claim 6, wherein the supply voltage at the input end of the supply circuit is 5V.
8. The portable adjustable frequency source device according to claim 1, further comprising a control panel, wherein the control panel (11) is electrically connected to the controller (2), and the control panel (11) is configured to obtain the target frequency information and transmit the target frequency information to the controller (2).
9. A portable adjustable frequency source device according to claim 1, characterized in that the output frequency range of the frequency synthesizer (3) is 10 MHz-1344 MHz, the operating bandwidth of the amplifier (5) is DC-1000 MHz, and the gain is 16.5 db.
10. The portable adjustable frequency source device according to claim 1, wherein the crystal oscillator (1) is a constant temperature crystal oscillator or a temperature compensated crystal oscillator.
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| CN113612475A (en) * | 2021-07-30 | 2021-11-05 | 天津光电通信技术有限公司 | Low stray low phase noise sweep frequency source |
| CN115065377A (en) * | 2022-07-27 | 2022-09-16 | 南京从景生物技术有限公司 | Two sets of portable same frequency or different frequency controlled radio frequency circuit |
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| CN113612475A (en) * | 2021-07-30 | 2021-11-05 | 天津光电通信技术有限公司 | Low stray low phase noise sweep frequency source |
| CN115065377A (en) * | 2022-07-27 | 2022-09-16 | 南京从景生物技术有限公司 | Two sets of portable same frequency or different frequency controlled radio frequency circuit |
| CN115065377B (en) * | 2022-07-27 | 2022-11-25 | 南京从景生物技术有限公司 | Two sets of portable same frequency or different frequency controlled radio frequency circuit |
| US11876544B2 (en) | 2022-07-27 | 2024-01-16 | Nanjing Congjing Biotechnology Co., LTD | Two-group portable same-frequency or different-frequency control radio frequency circuit |
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