CN208479603U - A kind of radio-frequency transmitter with raising circuit dynamic range functions - Google Patents
A kind of radio-frequency transmitter with raising circuit dynamic range functions Download PDFInfo
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- CN208479603U CN208479603U CN201821218743.6U CN201821218743U CN208479603U CN 208479603 U CN208479603 U CN 208479603U CN 201821218743 U CN201821218743 U CN 201821218743U CN 208479603 U CN208479603 U CN 208479603U
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- frequency transmitter
- controlled attenuator
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Abstract
The utility model discloses a kind of with the radio-frequency transmitter for improving circuit dynamic range functions, it is related to field of communication technology, the radio-frequency transmitter includes, limiter, preselection filter, electrically controlled attenuator, first order low-noise amplifier, coupler and the second level low-noise amplifier being sequentially connected in series, the output end of coupler is sequentially connected wave detector, A/D converter and controller, the output end of controller connects electrically controlled attenuator, to export the level to electrically controlled attenuator according to the adjustment of the string code of A/D converter to control the turn-on and turn-off of electrically controlled attenuator；The radio-frequency transmitter increases level-one electrically controlled attenuator on the basis of the front-end circuit of conventional RF receiver, and the adjustment to the level signal of electrically controlled attenuator is realized to control the turn-on and turn-off of electrically controlled attenuator by coupler, wave detector, A/D converter and controller, the maximum linear input power of radio-frequency transmitter is effectively improved, namely improves the dynamic range of radio-frequency transmitter.
Description
Technical field
It is especially a kind of to be connect with the radio frequency for improving circuit dynamic range functions the utility model relates to field of communication technology
Receipts machine.
Background technique
With the development of domestic microwave technology, the technical requirements of relevant device are also higher and higher, in radio-frequency transmitter
It in design, should guarantee the noise coefficient under the small signal of receiver, the saturation incoming level of receiver be improved again, due to low noise
The index of acoustic amplifier itself limits, both indexs are conflicting.
Referring to FIG. 1, the front-end circuit component sequence of conventional radio-frequency transmitter is followed successively by limiter, preselection filter
And multi-stage Low Noise Amplifier, Fig. 1 is by taking two-stage low-noise amplifier as an example.In general, the noise coefficient of radio-frequency transmitter
Mainly determined by first order low-noise amplifier, and for low-noise amplifier, noise coefficient is better, also implies that gain
It is higher, while it is smaller to export 1dB compression point.In the case where the input of small signal, low-noise amplifier works in linear condition.And
With the increase of input signal, low-noise amplifier gradually starts to be saturated, and for input signal more than this power, receiver is all
Work is in saturation state, at this time the communication quality straight line decline of receiver.So in the case that research input signal is excessive, such as
What keeps the linear extremely important of channel.
Utility model content
The present inventor regarding to the issue above and technical need, proposes a kind of with improving penetrating for circuit dynamic range functions
Circuit dynamic range can be improved in frequency receiver, the radio-frequency transmitter.
The technical solution of the utility model is as follows:
A kind of radio-frequency transmitter with raising circuit dynamic range functions, the radio-frequency transmitter include limiter, pre-selection
Filter, electrically controlled attenuator, first order low-noise amplifier, coupler, wave detector, A/D converter, controller and the second level
Low-noise amplifier, radio-frequency input signals are inputted from the input terminal of limiter, the output end connection preselection filter of limiter
Input terminal, the input terminal of the output end connection electrically controlled attenuator of preselection filter, the output end of electrically controlled attenuator connect the first order
The input terminal of low-noise amplifier, the input terminal of the output end connection coupler of first order low-noise amplifier, the of coupler
One output end connects the input terminal of second level low-noise amplifier, output of the radio frequency output signal from second level low-noise amplifier
End output, the input terminal of the second output terminal tie geophone of coupler, the input of the output end connection A/D converter of wave detector
End, the input terminal of the output end connection controller of A/D converter, the control terminal of the output end connection electrically controlled attenuator of controller；
Coupler is used to couple radiofrequency signal to wave detector, and wave detector is used to convert level signal, A/D converter for radiofrequency signal
For converting string code for level signal, controller is used to monitor string code and opening and closing according to string code control electrically controlled attenuator
It is disconnected.
Its further technical solution is that A/D converter is 12 A/D converters and is used to convert 12 for level signal
Bit string code, the supply voltage of A/D converter are 3.3V, and the detection accuracy of A/D converter is 0.0008V.
Its further technical solution is that the insertion loss of electrically controlled attenuator is less than 0.8dB.
Its further technical solution is that controller is realized using on-site programmable gate array FPGA.
The advantageous effects of the utility model are:
Radio-frequency transmitter disclosed in the present application increases level-one electricity on the basis of the front-end circuit of conventional RF receiver
Controlled attenuator, and the tune to the level signal of electrically controlled attenuator is realized by coupler, wave detector, A/D converter and controller
The whole turn-on and turn-off to control electrically controlled attenuator, effectively improve the maximum linear input power of radio-frequency transmitter, namely
The dynamic range of radio-frequency transmitter is improved, circuit design is simple, control is easy.And controller is according to the string code tune of A/D converter
Whole output is to the level of electrically controlled attenuator, and compared to custom circuit using for comparator, accuracy is higher.
Detailed description of the invention
Fig. 1 is the circuit diagram of existing radio-frequency transmitter.
Fig. 2 is the circuit diagram of the radio-frequency transmitter disclosed in the present application for having and improving circuit dynamic range functions.
Specific embodiment
Specific embodiments of the utility model will be further explained with reference to the accompanying drawing.
It is disclosed in the present application to have the radio-frequency transmitter for improving circuit dynamic range functions before conventional RF receiver
Level-one electrically controlled attenuator and corresponding control circuit are increased on the basis of terminal circuit, referring to FIG. 2, the radio-frequency transmitter includes
Limiter, preselection filter, electrically controlled attenuator, first order low-noise amplifier, coupler, wave detector, A/D converter (modulus
Converter), controller and second level low-noise amplifier.Radio-frequency input signals is inputted from the input terminal of limiter, limiter
Output end connection preselection filter input terminal, preselection filter output end connection electrically controlled attenuator input terminal, electricity adjust
The input terminal of the output end connection first order low-noise amplifier of attenuator, the output end of first order low-noise amplifier connect coupling
The input terminal of clutch, coupler the first output end connection second level low-noise amplifier input terminal, radio frequency output signal from
The output end of second level low-noise amplifier exports, if practical further includes other multi-stage Low Noise Amplifiers, similarly grade is associated in
After the low-noise amplifier of the second level.The output end of the input terminal of the second output terminal tie geophone of coupler, wave detector connects
The input terminal of A/D converter, the input terminal of the output end connection controller of A/D converter are connect, the output end of controller connects electricity
The control terminal of controlled attenuator.
In this application, controller generallys use FPGA (Field-Programmable Gate Array, i.e. scene can
Program gate array) it realizes.The insertion loss of electrically controlled attenuator is less than 0.8dB, to guarantee the noise coefficient of signal.A/D converter
For 12 A/D converters and for converting 12 bit string codes for level signal, the supply voltage of A/D converter is 3.3V, and A/D turns
The detection accuracy of parallel operation is 3.3V/ (212)=0.0008V.Specific component model the application used by each component is not
It limits.
In order to act on by the calculation specifications radio-frequency transmitter the raising of maximum linear input power, each first device is now provided
The index of part is as follows:
It can be obtained according to conventional RF receiver front end circuit counting shown in FIG. 1, when input power is -17dBm,
Second level low-noise amplifier i.e. reach saturation state, at this time entirely receive circuit saturation, receiving sensitivity reduce, receiver without
Method completes signal resolution task.
And according to known to radio-frequency transmitter working principle disclosed in the present application shown in Fig. 2: worked in radio-frequency transmitter
The radiofrequency signal after first order low-noise amplifier is couple wave detector, coefficient of coup 20dB, wave detector by Cheng Zhong, coupler
Level signal is converted by radiofrequency signal, level signal is converted string code by A/D converter.When input power is -17dBm,
The signal power for being coupled to wave detector is -14dBm, and wave detector output level signal corresponding with -14dBm signal power is somebody's turn to do should
Level signal obtains one 12 string codes by A/D converter, and thresholding is arranged according to this 12 string code in controller.It is subsequent to work as
When the string code monitored is less than this string code, indicate that input power is less than -17dBm, then controller is answered to electrically controlled attenuator output phase
It is in the conductive state that level controls electrically controlled attenuator；When the string code monitored be greater than this string code when, indicate input power be greater than-
17dBm, then controller answers level control electrically controlled attenuator in an off state to electrically controlled attenuator output phase.Therefore, work as input
When power is less than -17dBm, the electrically controlled attenuator before first order low-noise amplifier is in the conductive state, and insertion loss is
0.8dB.When input power reaches -17dBm, electrically controlled attenuator is converted to off state by state, Insertion Loss 25dB, this
When be input to the signal power decline 25dB of first order low-noise amplifier, so when input power reaches 8dBm, circuit is
Start to reach saturation state.
From the above mentioned, radio-frequency transmitter disclosed in the present application connects on the basis of These parameters compared to conventional radio frequency
Circuit dynamic range is improved 25dB by the circuit of receipts machine.
Meanwhile according to comparator come realize electrically controlled attenuator level reversion, then due to amplifier device limit, electricity
The minimum 0.01V of resolution ratio is pressed, when voltage is at critical level, comparator output often can not accurately determine output height, just
Oscillation can be generated.And as described above, the resolution ratio level namely detection accuracy of the A/D converter that the application uses are
0.0008V, the far smaller than voltage resolution of comparator.When input voltage increases 0.0008V, output string code increases by 1, control
Device processed can be compared according to string code, and the turn-on and turn-off of adjustment output level control electrically controlled attenuator can be effectively prevented
Oscillatory regime at comparative level.
Above-described is only the preferred embodiment of the application, and the utility model is not limited to above embodiments.It can manage
Solution, those skilled in the art do not depart from the utility model spirit and design under the premise of directly export or associate other
Improvements and changes are considered as being included within the scope of protection of this utility model.
Claims (4)
1. a kind of with the radio-frequency transmitter for improving circuit dynamic range functions, which is characterized in that the radio-frequency transmitter includes
Limiter, preselection filter, electrically controlled attenuator, first order low-noise amplifier, coupler, wave detector, A/D converter, control
Device and second level low-noise amplifier, radio-frequency input signals from the input terminal of the limiter input, the limiter it is defeated
Outlet connects the input terminal of the preselection filter, and the output end of the preselection filter connects the input of the electrically controlled attenuator
End, the output end of the electrically controlled attenuator connect the input terminal of the first order low-noise amplifier, the first order low noise
The output end of amplifier connects the input terminal of the coupler, and the first output end of the coupler connects the second level low noise
The input terminal of acoustic amplifier, radio frequency output signal are exported from the output end of the second level low-noise amplifier, the coupler
Second output terminal connect the input terminal of the wave detector, the output end of the wave detector connects the input of the A/D converter
End, the output end of the A/D converter connect the input terminal of the controller, and the output end connection electricity of the controller is adjusted
The control terminal of attenuator；The coupler is used to couple radiofrequency signal to the wave detector, and the wave detector is used for will be described
Radiofrequency signal is converted into level signal, and the A/D converter is used to convert the level signal to string code, and the controller is used
In the monitoring string code and opening and turning off for the electrically controlled attenuator is controlled according to the string code.
2. radio-frequency transmitter according to claim 1, which is characterized in that the A/D converter be 12 A/D converters simultaneously
For converting 12 bit string codes for the level signal, the supply voltage of the A/D converter is 3.3V, the A/D converter
Detection accuracy be 0.0008V.
3. radio-frequency transmitter according to claim 1, which is characterized in that the insertion loss of the electrically controlled attenuator is less than
0.8dB。
4. radio-frequency transmitter according to claim 1, which is characterized in that the controller uses field programmable gate array
FPGA is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821218743.6U CN208479603U (en) | 2018-07-30 | 2018-07-30 | A kind of radio-frequency transmitter with raising circuit dynamic range functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821218743.6U CN208479603U (en) | 2018-07-30 | 2018-07-30 | A kind of radio-frequency transmitter with raising circuit dynamic range functions |
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| Publication Number | Publication Date |
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| CN208479603U true CN208479603U (en) | 2019-02-05 |
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| CN201821218743.6U Active CN208479603U (en) | 2018-07-30 | 2018-07-30 | A kind of radio-frequency transmitter with raising circuit dynamic range functions |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030714A (en) * | 2019-11-24 | 2020-04-17 | 扬州海科电子科技有限公司 | High-speed anti-blocking receiver device and receiving method |
| CN115567070A (en) * | 2022-11-23 | 2023-01-03 | 中国电子科技集团公司第二十九研究所 | Front end assembly capable of self-adapting to instantaneous dynamic expansion |
-
2018
- 2018-07-30 CN CN201821218743.6U patent/CN208479603U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030714A (en) * | 2019-11-24 | 2020-04-17 | 扬州海科电子科技有限公司 | High-speed anti-blocking receiver device and receiving method |
| CN111030714B (en) * | 2019-11-24 | 2022-02-18 | 扬州海科电子科技有限公司 | High-speed anti-blocking receiver device and receiving method |
| CN115567070A (en) * | 2022-11-23 | 2023-01-03 | 中国电子科技集团公司第二十九研究所 | Front end assembly capable of self-adapting to instantaneous dynamic expansion |
| CN115567070B (en) * | 2022-11-23 | 2023-03-14 | 中国电子科技集团公司第二十九研究所 | Front end assembly capable of self-adapting to instantaneous dynamic expansion |
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