CN108809344A - A kind of RF automatic switching circuit based on power detection - Google Patents
A kind of RF automatic switching circuit based on power detection Download PDFInfo
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- CN108809344A CN108809344A CN201810811635.8A CN201810811635A CN108809344A CN 108809344 A CN108809344 A CN 108809344A CN 201810811635 A CN201810811635 A CN 201810811635A CN 108809344 A CN108809344 A CN 108809344A
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- capacitance
- power detection
- switch
- logic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for
Abstract
The invention discloses a kind of RF automatic switching circuit based on power detection, it is related to technology for radio frequency field, RF switch circuit to solve under the prior art can not automatically switch radiofrequency signal, need the additional software control slow-footed problem of circuit Complex Response simultaneously, the present invention includes termination power, RF switch, power detection and logic output unit and detection level adjustment unit, radiofrequency signal generates coupled signal by termination power in branch, power detection and logic pio chip carry out power detection and export logic control analog level more afterwards, logic control analog level controls the switching of RF switch, detect the power threshold that level adjustment unit can control signal, there is the present invention switch to automatically switch fast response time, switch switching power threshold values is adjustable, hardware circuit complexity is low, the simple advantage of circuit.
Description
Technical field
The present invention relates to technology for radio frequency field more particularly to a kind of RF automatic switching electricity based on power detection
Road.
Background technology
Phase-locked Frequency Synthesis Technique Controlled is a closed-loop automatic control technology that can track input signal phase, 20th century 40
Age is widely used.It is rapidly developed from this Phase Lock Technique, and promotes the development of frequency synthesis technique, occurred in succession
Frequency synthesizer of phase locking, frequency dividing frequency synthesizer of phase locking, decimal frequency synthesizer of phase locking etc..With the development of digital technology,
Extensive and very large scale integration technology development, synthesizer chip people, which measures, to be realized so that frequency synthesizer of phase locking
In radio art extensive use.
DDS is mainly made of phase accumulator, sinusoidal waveform table, D/A converter, low-pass filter.In system clock fc
Control under, frequency control word K is sent to phase accumulator, the data of phase accumulator are updated, then in phase accumulator
Data N sinusoidal ROM tables are inquired as address, can change the output frequency value of DDS by changing phase increment.
The waveform quantization data that mountain is taken by waveform ROM memory, are converted into analog voltage/current, using low pass by A/D converter
Filter filters out the higher hamonic wave in waveform, obtains the output frequency of DDS.
In order to cope with different requirements, it is desirable that internal letter had both can be used in phaselocked loop input signal, DDS system clocks fc
Number, and can need RF switch circuit with external clocking signals and it is handled.
Superhet uses internal local oscillation signal mostly at this stage, limits to its application significantly, is used in receiver
This circuit, receiver may be selected, using internal local oscillator or external local oscillator, to improve the application of receiver.
The implementation method of existing RF switch circuit there are many kind, relatively common structure and there are the problem of it is as follows：
(1) button manual switching radiofrequency signal is used, the problem is that needing manually to be controlled；
(2) PFGA or microcontroller is used to parse control instruction, PFGA or microcontroller generate control Signal-controlled switch switching,
, the problem is that needing software control, increase instruction number needs process instruction, handoff response speed slow for it.
(3) power detection is used to export analog voltage, voltage is directly proportional to power, big using logic unit detection voltage value
It is small, switching is controlled, the problem is that circuit devcie quantity is more, circuit is complicated, and volume is big.
Therefore design one kind can automatically switch radiofrequency signal, while the faster radio frequency of processing speed simple in structure is cut automatically
Change circuit has realistic meaning very much.
Invention content
It is an object of the invention to:In order to which the RF switch circuit solved under the prior art can not automatically switch radio frequency letter
Number, the additional software control slow-footed problem of circuit Complex Response simultaneously is needed, the present invention provides one kind being based on power detection
RF automatic switching circuit, directly use power detection and logic pio chip directly detect power output and control level, nothing
FPGA or microcontroller need to be used, greatly improves switching corresponding speed, while hardware circuit complexity reduces, circuit
More stablize.
The technical solution adopted by the present invention is as follows：
A kind of RF automatic switching circuit based on power detection, including：
Termination power, RF switch, power detection and logic output unit and detection level adjustment unit, the second radio frequency letter
Obtain coupled signal after number coupled processing of circuit, the coupled signal, which passes through, to be coupled branch and be sent into power detection and logic output
Unit, the RF switch also simultaneously receive by termination power conduction come the second radiofrequency signal with directly input RF switch
First radiofrequency signal, the power detection and logic output unit output logic control analog level are for controlling RF switch
To export individual signals, the detection level adjustment unit is used to control the power inspection of power detection and logic output unit for switching
Side valve value.
Further, the termination power includes capacitance C3, capacitance C6, resistance R1 and resistance R2, the second radio frequency letter
Number circuit is entered by input terminal P2, the input terminal P2 is separately connected one end of one end and resistance R1 of capacitance C3, described
The other end of resistance R1 is separately connected one end of one end and capacitance C6 of resistance R2, the other end ground connection of the resistance R2.
Further, the RF switch includes switch chip U1, and the 8 feet connection capacitance C3's of the switch chip U1 is another
One end, first radiofrequency signal enter circuit by input terminal P1, connecting valve after the input terminal P1 series capacitances C1
0,4,6 and 7 feet of 5 feet of chip U1, the switch chip U1 are grounded, after the 3 foot series capacitance C2 of the switch chip U1
Connect one end of the 2 feet connection capacitance C5 of leading-out terminal P3, the switch chip U1, the other end ground connection of the capacitance C5, institute
State one end of the 1 foot connection capacitance C4 of switch chip U1, the other end ground connection of the capacitance C4.
Further, the power detection and logic output unit include power detection and logic pio chip U2, described
1 foot of power detection and logic pio chip U2 connect the other end of capacitance C6, the power detection and logic pio chip U2
2 feet be separately connected 8 feet of power detection and logic pio chip U2, one end of capacitance C8, one end of inductance L2 and capacitance C7
One end, the other end of the capacitance C7 and the other end of C8 be grounded, and the other end of the inductance L2 is separately connected 5V direct currents
One end of electricity and inductance L1, the other end of the inductance L1 is separately connected one end of 1 foot and capacitance C4 of switch chip U1, described
The other end of capacitance C4 is grounded, and the 4 foot series capacitance C10 and ground connection of the power detection and logic pio chip U2 are described to penetrate
7 feet of frequency connector U2 are separately connected one end of one end and capacitance C5 of resistance R3, the resistance R3 series connection light emitting diodes D1
After be grounded, 5 feet of the power detection and logic pio chip U2 ground connection.
Further, the detection level adjustment unit includes potentiometer U3, the L feet ground connection of the potentiometer U3, described
The TX feet of potentiometer U3 are separately connected 3 feet of one end and power detection and logic pio chip U2 of capacitance C9, the capacitance C9
The other end ground connection, the potentiometer U3 H feet connection power detection and logic pio chip U2 8 feet.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1. the present invention directly controls the switching of RF switch using power detection and logic pio chip, without using by
The instruction system of FPGA or microcontroller manually controls, and eliminates the processing of software aspects, by the speed of switching improve to
1us ranks.
2. the present invention uses power detection and logic pio chip, directly detects power output and control level, be not necessarily to work(
Rate size is converted into analog voltage, reuses logic unit detection voltage value size, and control RF switch switches, and hardware circuit is multiple
Miscellaneous degree reduces, volume smaller, and circuit is more stablized.
3. present invention detection level adjustment unit can be detected with regulation power and the power valve size of logic chip, provide
The application range of this circuit.
4. the coupled modes that the present invention uses couple for unequal power, main road Insertion Loss only has 0.7dB, without carrying out power benefit
It repays.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is module connection figure of the present invention；
Fig. 2 is circuit diagram of the present invention；
Fig. 3 is the relational graph of the detection threshold and setting voltage of power detection and logic pio chip of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used for explaining the present invention, not
For limiting the present invention, i.e., described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is logical
The component for the embodiment of the present invention being often described and illustrated herein in the accompanying drawings can be arranged and be designed with a variety of different configurations.
Therefore, below the detailed description of the embodiment of the present invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiment of the present invention, people in the art
The every other embodiment that member is obtained without making creative work, shall fall within the protection scope of the present invention.
It should be noted that the relational terms of term " first " and " second " or the like be used merely to an entity or
Operation is distinguished with another entity or operation, and without necessarily requiring or implying between these entities or operation, there are any
This actual relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant be intended to it is non-exclusive
Property include so that including a series of elements process, method, article or equipment not only include those elements, but also
Further include other elements that are not explicitly listed, or further include for this process, method, article or equipment it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including described
There is also other identical elements in the process, method, article or equipment of element.
As shown in Figure 1, a kind of RF automatic switching circuit based on power detection, including：
Termination power, RF switch, power detection and logic output unit and detection level adjustment unit, the second radio frequency letter
Obtain coupled signal after number coupled processing of circuit, the coupled signal, which passes through, to be coupled branch and be sent into power detection and logic output
Unit, the RF switch also simultaneously receive by termination power conduction come the second radiofrequency signal with directly input RF switch
After first radiofrequency signal, the power detection and logic output unit detection coupled signal, output logic control analog level is used
In the switching of control RF switch to export individual signals, the detection level adjustment unit is for controlling power detection and logic
The power detection threshold values of output unit.
As a preferred embodiment, the termination power includes capacitance C3, capacitance C6, resistance R1 and resistance R2,
Second radiofrequency signal enters circuit by input terminal P2, and the input terminal P2 is separately connected one end and the resistance of capacitance C3
One end of R1, the other end of the resistance R1 are separately connected one end of one end and capacitance C6 of resistance R2, and the resistance R2's is another
One end is grounded.
The termination power realizes that the coupling amount of coupler is -20dB, and insertion loss is about using resistance coupled modes
0.5dB。
As a preferred embodiment, the RF switch includes switch chip U1,8 feet of the switch chip U1
The other end of capacitance C3 is connected, first radiofrequency signal enters circuit, the input terminal P1 series electricals by input terminal P1
5 feet of connecting valve chip U1,0,4,6 and 7 feet of the switch chip U1 are grounded after appearance C1, and the 3 of the switch chip U1
One end of the 2 feet connection capacitance C5 of leading-out terminal P3, the switch chip U1, the capacitance C5 are connected after foot series capacitance C2
Other end ground connection, one end of the 1 foot connection capacitance C4 of the switch chip U1, the other end ground connection of the capacitance C4.
The RF switch uses the HMC349MS8G of ADI companies to realize, and switch frequency of use ranging from 0.1~
4GHz, interchannel isolation are better than 38dBc, and switch isolation degree is better than 42dBc, and switch control low level is 0~0.8V, high level
For 2~5V.
As a preferred embodiment, the power detection and logic output unit include that power detection and logic are defeated
Go out chip U2, the other end of the 1 foot connection capacitance C6 of the power detection and logic pio chip U2 and are patrolled at the power detection
2 feet of volume pio chip U2 are separately connected 8 feet of power detection and logic pio chip U2, one end of capacitance C8, inductance L2
One end of one end and capacitance C7, the other end of the capacitance C7 and the other end of C8 are grounded, the other end point of the inductance L2
Not Lian Jie 5V direct currents and inductance L1 one end, the other end of the inductance L1 is separately connected 1 foot and capacitance of switch chip U1
The 4 foot series capacitance C10 of one end of C4, the other end ground connection of the capacitance C4, the power detection and logic pio chip U2
And ground connection, 7 feet of the radio frequency connector U2 are separately connected one end of one end and capacitance C5 of resistance R3, the resistance R3 series connection
It is grounded after light emitting diode D1, the 5 feet ground connection of the power detection and logic pio chip U2.
The power detection and logic pio chip use the MAX9930EUA+T of MAXIM company, power detection comment
Ranging from 2MHz~1.6GHz, it is 0.15V, high level 2.75V that logic, which exports low level,.
As a preferred embodiment, the detection level adjustment unit includes potentiometer U3, the potentiometer U3
L feet ground connection, the TX feet of the potentiometer U3 are separately connected one end and power detection and the logic pio chip U2 of capacitance C9
3 feet, the other end ground connection of the capacitance C9, the H feet connection power detection and logic pio chip U2 of the potentiometer U3
8 feet.
The detection level adjustment unit adjusts setting voltage, the pass of power detection threshold values and setting voltage using potentiometer
System is as shown in Figure 2.
It is 1V or so that the RF automatic switching circuit based on power detection in the present embodiment, which adjusts potentiometer setting voltage,
According to fig. 2, the power threshold of signal power detection is -20dBm, is -20dB according to the branch coupling amount of resistance termination power, when
When the DDS sampled signal power that signal inputs P2 inputs 1GHz is more than 0dBm, MAX9930EUA+T output voltages are 2.75V, are
Within the scope of HMC349MS8G high level, switching, signal inputs P2 and is connected to signal output P3, while LED light is lighted, and is indicated
Switching is completed, conversely, MAX9930EUA+T output voltages are 0.15V, it is switch within the scope of HMC349MS8G low levels
Switching, signal input P1 and are connected to signal output P3, and according to fig. 2, ranging from -25~20dBm, work is arranged in this circuit power threshold values
Working frequency ranging from 0.1~1.6GHz.
The above is only the preferred embodiment of the present invention, it is noted that is come for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, can also make several modifications and improvements, these belong to the protection model of invention
It encloses.
Claims (5)
1. a kind of RF automatic switching circuit based on power detection, which is characterized in that including：
Termination power, RF switch, power detection and logic output unit and detection level adjustment unit, the second radiofrequency signal warp
Coupled signal is obtained after termination power processing, the coupled signal is sent into power detection and logic output unit, the radio frequency are opened
Close receive simultaneously by termination power conduction Lai the second radiofrequency signal with directly input the first radiofrequency signal of RF switch, it is described
Power detection and logic output unit output logic control analog level are for controlling the switching of RF switch to export single letter
Number, the detection level adjustment unit is used to control the power detection threshold values of power detection and logic output unit.
2. a kind of RF automatic switching circuit based on power detection according to claim 1, which is characterized in that the coupling
It includes that capacitance C3, capacitance C6, resistance R1 and resistance R2, second radiofrequency signal enter circuit by input terminal P2 to close circuit,
The input terminal P2 is separately connected one end of one end and resistance R1 of capacitance C3, and the other end of the resistance R1 is separately connected electricity
Hinder one end of one end and capacitance C6 of R2, the other end ground connection of the resistance R2.
3. a kind of RF automatic switching circuit based on power detection according to claim 2, which is characterized in that described to penetrate
Frequency switch includes switch chip U1, and 8 feet of the switch chip U1 connect the other end of capacitance C3, first radiofrequency signal by
Input terminal P1 enters circuit, 5 feet of connecting valve chip U1, the switch chip after the input terminal P1 series capacitances C1
0,4,6 and 7 feet of U1 are grounded, and leading-out terminal P3, the switch core are connected after the 3 foot series capacitance C2 of the switch chip U1
One end of the 2 feet connection capacitance C5 of piece U1, the other end ground connection of the capacitance C5,1 foot of the switch chip U1 connect capacitance
One end of C4, the other end ground connection of the capacitance C4.
4. a kind of RF automatic switching circuit based on power detection according to claim 3, which is characterized in that the work(
Rate detects and logic output unit includes power detection and logic pio chip U2, the power detection and logic pio chip U2
1 foot connection capacitance C6 the other end, 2 feet of the power detection and logic pio chip U2 are separately connected power detection and patrol
Volume 8 feet of pio chip U2, one end of capacitance C8, inductance L2 one end and capacitance C7 one end, the other end of the capacitance C7
It is grounded with the other end of C8, the other end of the inductance L2 is separately connected one end of 5V direct currents and inductance L1, the inductance
The other end of L1 is separately connected one end of 1 foot and capacitance C4 of switch chip U1, the other end ground connection of the capacitance C4, the work(
Rate detects and 4 foot series capacitance C10 and the ground connection of logic pio chip U2,7 feet of the radio frequency connector U2 are separately connected electricity
One end of one end and capacitance C5 of R3 is hindered, is grounded after the resistance R3 series connection light emitting diodes D1, the power detection and logic
5 feet of pio chip U2 are grounded.
5. a kind of RF automatic switching circuit based on power detection according to claim 4, which is characterized in that the inspection
It includes potentiometer U3 to survey level adjustment unit, and the L feet ground connection of the potentiometer U3, the TX feet of the potentiometer U3 are separately connected electricity
Hold 3 feet of one end and power detection and logic pio chip U2 of C9, the other end ground connection of the capacitance C9, the potentiometer U3
H feet connection power detection and logic pio chip U2 8 feet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810811635.8A CN108809344B (en) | 2018-07-23 | 2018-07-23 | Radio frequency automatic switching circuit based on power detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810811635.8A CN108809344B (en) | 2018-07-23 | 2018-07-23 | Radio frequency automatic switching circuit based on power detection |
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| Publication Number | Publication Date |
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| CN108809344A true CN108809344A (en) | 2018-11-13 |
| CN108809344B CN108809344B (en) | 2021-04-23 |
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ID=64077807
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810811635.8A Active CN108809344B (en) | 2018-07-23 | 2018-07-23 | Radio frequency automatic switching circuit based on power detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030716A (en) * | 2019-12-30 | 2020-04-17 | 深圳市大富科技股份有限公司 | 5G mobile communication system and radio frequency coupling circuit thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107805A (en) * | 2012-12-24 | 2013-05-15 | 天津七六四通信导航技术有限公司 | Circuit and implement method for changing and selecting two-road ratio-frequency signals |
| CN103828245A (en) * | 2011-09-20 | 2014-05-28 | 高通股份有限公司 | Antenna power coupler having a variable coupling factor |
| CN105722109A (en) * | 2014-12-04 | 2016-06-29 | 罗森伯格技术（昆山）有限公司 | TD_LTE power detection module, switching control method and communication equipment |
-
2018
- 2018-07-23 CN CN201810811635.8A patent/CN108809344B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103828245A (en) * | 2011-09-20 | 2014-05-28 | 高通股份有限公司 | Antenna power coupler having a variable coupling factor |
| CN103107805A (en) * | 2012-12-24 | 2013-05-15 | 天津七六四通信导航技术有限公司 | Circuit and implement method for changing and selecting two-road ratio-frequency signals |
| CN105722109A (en) * | 2014-12-04 | 2016-06-29 | 罗森伯格技术（昆山）有限公司 | TD_LTE power detection module, switching control method and communication equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030716A (en) * | 2019-12-30 | 2020-04-17 | 深圳市大富科技股份有限公司 | 5G mobile communication system and radio frequency coupling circuit thereof |
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| CN108809344B (en) | 2021-04-23 |
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