CN206575394U - A kind of radio frequency transmitter circuitry based on three-level frequency conversion - Google Patents
A kind of radio frequency transmitter circuitry based on three-level frequency conversion Download PDFInfo
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- CN206575394U CN206575394U CN201720020408.4U CN201720020408U CN206575394U CN 206575394 U CN206575394 U CN 206575394U CN 201720020408 U CN201720020408 U CN 201720020408U CN 206575394 U CN206575394 U CN 206575394U
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Abstract
The utility model discloses a kind of radio frequency transmitter circuitry based on three-level frequency conversion, including intermediate frequency amplifier, low pass filter, the first frequency mixer, the second frequency mixer, three-mixer, high-pass filter, radio frequency amplifier, power amplifier, the first spot-frequency local oscillation source, second point frequency local vibration source and frequency sweep local vibration source；The output end of intermediate frequency amplifier is connected by low pass filter with the first input end of the first frequency mixer, second input of the first frequency mixer is connected with the first spot-frequency local oscillation source, the output end of first frequency mixer is connected with the first input end of the second frequency mixer, second input of the second frequency mixer is connected with second point frequency local vibration source, the output end of second frequency mixer is connected with the first input end of three-mixer, second input of three-mixer is connected with frequency sweep local vibration source, the output end of three-mixer passes sequentially through high-pass filter, radio frequency amplifier and power amplifier are connected with transmitting antenna.The utility model effectively increases the isolation of radiofrequency signal and intermediate-freuqncy signal.
Description
Technical field
The utility model is related to a kind of radio frequency transmitter circuitry based on three-level frequency conversion.
Background technology
Since being set up from 19th-century Maxwell Theory of Electromagnetic Field, radiotechnics has been deep into Human routine activities
Every field.Radiotechnics is widely used in engineering fields such as the energy, traffic, medical treatment and information.Electromagnetic wave
As a kind of energy or the carrier of information, its most basic physical quantity is frequency and power.It is extensive with application, penetrate
The transmit-receive radio road that takes place frequently is more and more important in the application；
Up-conversion design in radio frequency transmitter circuitry is to influence one of key factor of radiofrequency signal quality good or not, for nothing
Line communication also plays vital effect, and the major function of up-converter circuit is from a relatively low frequency conversion by signal
To another higher frequency, be conducive to the transmitting and transmission of signal；But presently, in existing radio frequency transmitter circuitry, in
Frequency signal and the isolation of radiofrequency signal are relatively low so that the application of radio frequency transmitter circuitry is restricted, therefore, and raising is penetrated
The isolation of radiofrequency signal and intermediate-freuqncy signal is extremely important in the transmit-receive radio road that takes place frequently.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art that there is provided a kind of radio-frequency transmissions based on three-level frequency conversion
Circuit, by way of three-level frequency conversion, improves the isolation of radiofrequency signal and intermediate-freuqncy signal.
The purpose of this utility model is achieved through the following technical solutions：A kind of radio-frequency transmissions based on three-level frequency conversion
Circuit, including intermediate frequency amplifier, low pass filter, the first frequency mixer, the second frequency mixer, three-mixer, high-pass filter, penetrate
Audio amplifier, power amplifier, transmitting antenna, the first spot-frequency local oscillation source, second point frequency local vibration source and frequency sweep local vibration source；
The input of the intermediate frequency amplifier receives baseband signal, the output end of intermediate frequency amplifier by low pass filter with
The first input end connection of first frequency mixer, the second input of the first frequency mixer is connected with the first spot-frequency local oscillation source, and first mixes
The output end of frequency device is connected with the first input end of the second frequency mixer, the second input and the second spot-frequency local oscillation of the second frequency mixer
Source is connected, and the output end of the second frequency mixer is connected with the first input end of three-mixer, the second input of three-mixer
It is connected with frequency sweep local vibration source, the output end of three-mixer passes sequentially through high-pass filter, radio frequency amplifier and power amplifier
It is connected with transmitting antenna.
The first local oscillator phaselocked loop, the first spot-frequency local oscillation are additionally provided between first frequency mixer and the first spot-frequency local oscillation source
The output end in source is connected by the first local oscillator phaselocked loop with the second input of the first frequency mixer.
The second local oscillator phaselocked loop is additionally provided between second frequency mixer and second point the frequency local vibration source；Second spot-frequency local oscillation
The output end in source is connected by the second local oscillator phaselocked loop with the second input of the second frequency mixer.
The first AMP amplifiers, the output of the first frequency mixer are additionally provided between first frequency mixer and the second frequency mixer
End is connected by the first AMP amplifiers with the first input end of the second frequency mixer.
The 2nd AMP amplifiers, the output of the second frequency mixer are additionally provided between second frequency mixer and three-mixer
End is connected by the 2nd AMP amplifiers with the first input end of three-mixer.
The second local oscillator phaselocked loop and the first local oscillator phaselocked loop are charge pump type phaselocked loop.
The charge pump type phaselocked loop includes phase frequency detector, charge pump, loop filter and voltage controlled oscillator；
The signal input part of phase frequency detector is connected with the first spot-frequency local oscillation source or second point frequency local vibration source；Phase frequency detector
Output end pass sequentially through charge pump, loop filter and voltage controlled oscillator and carry out signal output；The voltage controlled oscillator it is defeated
Go out end to be also connected with the feedback input end of phase frequency detector.
The beneficial effects of the utility model are：（1）Intermediate-freuqncy signal is converted into radiofrequency signal by way of three-level frequency conversion,
Improve the isolation of radiofrequency signal and intermediate-freuqncy signal.
（2）The first local oscillator phaselocked loop, the first spot-frequency local oscillation source are provided between first frequency mixer and the first spot-frequency local oscillation source
Output end be connected by the first local oscillator phaselocked loop with the second input of the first frequency mixer；The first spot-frequency local oscillation source can be locked
The frequency of output so that mixing is more accurate, improves the transmission signal quality of radio frequency transmitter circuitry.
（3）The second local oscillator phaselocked loop is additionally provided between second frequency mixer and second point frequency local vibration source；Second spot-frequency local oscillation
The output end in source is connected by the second local oscillator phaselocked loop with the second input of the second frequency mixer；The second spot-frequency local oscillation can be locked
The frequency of source output so that mixing is more accurate, improves the transmission signal quality of radio frequency transmitter circuitry.
（4）First local oscillator phaselocked loop and the second local oscillator phaselocked loop are charge pump type phaselocked loop, can realize that stability is high,
Spuious and phase noise suppression can be effectively realized.
Brief description of the drawings
Fig. 1 is theory diagram of the present utility model；
Fig. 2 is the structural representation of charge pump type phaselocked loop.
Embodiment
The technical solution of the utility model, but protection domain of the present utility model are described in further detail below in conjunction with the accompanying drawings
It is not limited to as described below.
As shown in figure 1, a kind of radio frequency transmitter circuitry based on three-level frequency conversion, including intermediate frequency amplifier, low pass filter,
One frequency mixer, the second frequency mixer, three-mixer, high-pass filter, radio frequency amplifier, power amplifier, transmitting antenna, first
Spot-frequency local oscillation source, second point frequency local vibration source and frequency sweep local vibration source；
The input of the intermediate frequency amplifier receives baseband signal, the output end of intermediate frequency amplifier by low pass filter with
The first input end connection of first frequency mixer, the second input of the first frequency mixer is connected with the first spot-frequency local oscillation source, and first mixes
The output end of frequency device is connected with the first input end of the second frequency mixer, the second input and the second spot-frequency local oscillation of the second frequency mixer
Source is connected, and the output end of the second frequency mixer is connected with the first input end of three-mixer, the second input of three-mixer
It is connected with frequency sweep local vibration source, the output end of three-mixer passes sequentially through high-pass filter, radio frequency amplifier and power amplifier
It is connected with transmitting antenna.
The first local oscillator phaselocked loop, the first spot-frequency local oscillation are additionally provided between first frequency mixer and the first spot-frequency local oscillation source
The output end in source is connected by the first local oscillator phaselocked loop with the second input of the first frequency mixer.
The second local oscillator phaselocked loop is additionally provided between second frequency mixer and second point the frequency local vibration source；Second spot-frequency local oscillation
The output end in source is connected by the second local oscillator phaselocked loop with the second input of the second frequency mixer.
The first AMP amplifiers, the output of the first frequency mixer are additionally provided between first frequency mixer and the second frequency mixer
End is connected by the first AMP amplifiers with the first input end of the second frequency mixer.
The 2nd AMP amplifiers, the output of the second frequency mixer are additionally provided between second frequency mixer and three-mixer
End is connected by the 2nd AMP amplifiers with the first input end of three-mixer.
The second local oscillator phaselocked loop and the first local oscillator phaselocked loop are charge pump type phaselocked loop.
As shown in Fig. 2 the charge pump type phaselocked loop includes phase frequency detector, charge pump, loop filter and voltage-controlled shaken
Swing device；
The signal input part of phase frequency detector is connected with the first spot-frequency local oscillation source or second point frequency local vibration source；Phase frequency detector
Output end pass sequentially through charge pump, loop filter and voltage controlled oscillator and carry out signal output；The voltage controlled oscillator it is defeated
Go out end to be also connected with the feedback input end of phase frequency detector.
Intermediate-freuqncy signal is converted to radiofrequency signal by the utility model by way of three-level frequency conversion, improve radiofrequency signal with
The isolation of intermediate-freuqncy signal.The first local oscillator phaselocked loop, first point of frequency are provided between first frequency mixer and the first spot-frequency local oscillation source
The output end of local vibration source is connected by the first local oscillator phaselocked loop with the second input of the first frequency mixer；First point of frequency can be locked
The frequency of local vibration source output so that mixing is more accurate, improves the transmission signal quality of radio frequency transmitter circuitry.Second frequency mixer with
The second local oscillator phaselocked loop is additionally provided between second point frequency local vibration source；The output end of second point frequency local vibration source is locked by the second local oscillator
Phase ring is connected with the second input of the second frequency mixer；The frequency of second point frequency local vibration source output can be locked so that mixing is more
Plus it is accurate, further improve the transmission signal quality of radio frequency transmitter circuitry；First local oscillator phaselocked loop and the second local oscillator phaselocked loop are equal
For charge pump type phaselocked loop, it can realize that stability is high, spuious and phase noise suppression, wherein electric charge can be effectively realized
In pump-type phaselocked loop phase frequency detector be using ultrahigh speed phase frequency detector AD9901, AD9901 a key property can be with
Medium standard frequency frequency compares phase/frequency input, without pre-divider, has saved the cost of phase-locked loop circuit, by it is low its
Complexity.
Claims (7)
1. a kind of radio frequency transmitter circuitry based on three-level frequency conversion, it is characterised in that：Including intermediate frequency amplifier, low pass filter,
One frequency mixer, the second frequency mixer, three-mixer, high-pass filter, radio frequency amplifier, power amplifier, transmitting antenna, first
Spot-frequency local oscillation source, second point frequency local vibration source and frequency sweep local vibration source；
The input of the intermediate frequency amplifier receives baseband signal, and the output end of intermediate frequency amplifier passes through low pass filter and first
The first input end connection of frequency mixer, the second input of the first frequency mixer is connected with the first spot-frequency local oscillation source, the first frequency mixer
Output end be connected with the first input end of the second frequency mixer, the second input of the second frequency mixer connects with second point frequency local vibration source
Connect, the output end of the second frequency mixer is connected with the first input end of three-mixer, the second input of three-mixer is with sweeping
Frequency local vibration source is connected, and the output end of three-mixer passes sequentially through high-pass filter, radio frequency amplifier and power amplifier and hair
Penetrate antenna connection.
2. a kind of radio frequency transmitter circuitry based on three-level frequency conversion according to claim 1, it is characterised in that：Described first mixes
The first local oscillator phaselocked loop is additionally provided between frequency device and the first spot-frequency local oscillation source, the output end in the first spot-frequency local oscillation source passes through first
Local oscillator phaselocked loop is connected with the second input of the first frequency mixer.
3. a kind of radio frequency transmitter circuitry based on three-level frequency conversion according to claim 2, it is characterised in that：Described second mixes
The second local oscillator phaselocked loop is additionally provided between frequency device and second point frequency local vibration source；The output end of second point frequency local vibration source passes through second
Local oscillator phaselocked loop is connected with the second input of the second frequency mixer.
4. a kind of radio frequency transmitter circuitry based on three-level frequency conversion according to claim 1, it is characterised in that：Described first mixes
The first AMP amplifiers are additionally provided between frequency device and the second frequency mixer, the output end of the first frequency mixer passes through the first AMP amplifiers
It is connected with the first input end of the second frequency mixer.
5. a kind of radio frequency transmitter circuitry based on three-level frequency conversion according to claim 1, it is characterised in that：Described second mixes
The 2nd AMP amplifiers are additionally provided between frequency device and three-mixer, the output end of the second frequency mixer passes through the 2nd AMP amplifiers
It is connected with the first input end of three-mixer.
6. a kind of radio frequency transmitter circuitry based on three-level frequency conversion according to claim 3, it is characterised in that：Second local oscillator is locked
Phase ring and the first local oscillator phaselocked loop are charge pump type phaselocked loop.
7. a kind of radio frequency transmitter circuitry based on three-level frequency conversion according to claim 6, it is characterised in that：The charge pump
Type phaselocked loop includes phase frequency detector, charge pump, loop filter and voltage controlled oscillator；
The signal input part of phase frequency detector is connected with the first spot-frequency local oscillation source or second point frequency local vibration source；Phase frequency detector it is defeated
Go out end and pass sequentially through charge pump, loop filter and voltage controlled oscillator progress signal output；The output end of the voltage controlled oscillator
Also it is connected with the feedback input end of phase frequency detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720020408.4U CN206575394U (en) | 2017-01-09 | 2017-01-09 | A kind of radio frequency transmitter circuitry based on three-level frequency conversion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720020408.4U CN206575394U (en) | 2017-01-09 | 2017-01-09 | A kind of radio frequency transmitter circuitry based on three-level frequency conversion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206575394U true CN206575394U (en) | 2017-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720020408.4U Expired - Fee Related CN206575394U (en) | 2017-01-09 | 2017-01-09 | A kind of radio frequency transmitter circuitry based on three-level frequency conversion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206575394U (en) |
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2017
- 2017-01-09 CN CN201720020408.4U patent/CN206575394U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171020 Termination date: 20190109 |