CN108206703A - Radio frequency transmitter circuitry, transmitter and user terminal - Google Patents
Radio frequency transmitter circuitry, transmitter and user terminal Download PDFInfo
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- CN108206703A CN108206703A CN201611185845.8A CN201611185845A CN108206703A CN 108206703 A CN108206703 A CN 108206703A CN 201611185845 A CN201611185845 A CN 201611185845A CN 108206703 A CN108206703 A CN 108206703A
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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
- H04B1/02—Transmitters
- H04B1/04—Circuits
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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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
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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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/045—Circuits with power amplifiers with means for improving efficiency
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- Computer Networks & Wireless Communication (AREA)
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Abstract
A kind of radio frequency transmitter circuitry, transmitter and user terminal.The radio frequency transmitter circuitry includes：Input direction coupler, envelope detected circuit, the first envelope-tracking circuit, the second envelope-tracking circuit, adder and radio-frequency power amplifier, wherein：The first envelope-tracking circuit is coupled with the adder, is carried out envelope-tracking suitable for being less than the low frequency part of first frequency to frequency in the envelope signal, is generated the first envelope-tracking signal synchronous with first signal；The second envelope-tracking circuit, it is coupled with the adder, envelope-tracking is carried out suitable for being more than the high frequency section of second frequency to frequency in the envelope signal, generates the second envelope-tracking signal synchronous with first signal, the first frequency is less than or equal to the second frequency.The working efficiency of radio-frequency power amplifier can be improved using said program.
Description
Technical field
The present invention relates to electronic circuit technology fields, and in particular to a kind of radio frequency transmitter circuitry, transmitter and user terminal.
Background technology
In current communication system, the signal to be transmitted of transmitting terminal generation, usually in the amplification through radio-frequency power amplifier
After processing, then emitted to receiving terminal by antenna.
In order to improve the working efficiency of radio-frequency power amplifier, before the enhanced processing through radio-frequency power amplifier, usually
Need to the envelope of signal to be transmitted into line trace, it is possible thereby to provided for radio-frequency power amplifier change with envelope signal it is inclined
Voltage is put, to improve the working efficiency of radio-frequency power amplifier, achievees the purpose that improve the working efficiency of radio-frequency power amplifier.
However, in some cases, it is currently used for the biasing that signal to be transmitted is carried out the circuit of envelope-tracking and provided
Voltage is still difficult to the working efficiency that radio-frequency power amplifier is enabled to reach higher.
Invention content
Present invention solves the technical problem that it is how to improve the working efficiency of radio-frequency power amplifier.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of radio frequency transmitter circuitry, the radio frequency transmitter circuitry
Including：Input direction coupler, envelope detected circuit, the first envelope-tracking circuit, the second envelope-tracking circuit, signal merge electricity
Road and radio-frequency power amplifier, wherein：The input direction coupler amplifies with the envelope detected circuit and radio-frequency power
Device couples, and suitable for signal to be transmitted is separated into the first signal and second signal, first signal is suitable for through the radio frequency
The signal of power amplifier transmitting, the second signal is to be adapted to provide for the signal of envelope signal；The envelope detected circuit, with
The first envelope-tracking circuit and the coupling of the second envelope-tracking circuit, suitable for isolating the envelope from the second signal
Signal；The first envelope-tracking circuit is coupled with the adder, suitable for being less than to frequency in the envelope signal
The low frequency part of first frequency carries out envelope-tracking, generates the first envelope-tracking signal synchronous with first signal；It is described
Second envelope-tracking circuit is coupled with the adder, suitable for being more than second frequency to frequency in the envelope signal
High frequency section carry out envelope-tracking, generate the second envelope-tracking signal synchronous with first signal, the first frequency
Less than or equal to the second frequency；The adder is coupled with the radio-frequency power amplifier, suitable for described the
One envelope-tracking signal and the second envelope-tracking signal merge, and generate bias voltage and provide signal；The radio frequency work(
Rate amplifier suitable for bias voltage to be provided to the voltage of signal as bias voltage, to the second signal send out big rear defeated
Go out.
Optionally, the first envelope-tracking circuit includes：Low-pass filter and DC-DC converter, wherein：It is described
Low-pass filter is coupled with the envelope detected circuit, suitable for carrying out low-pass filtering to the envelope signal, obtains the envelope
Signal intermediate frequency rate is less than the low frequency part of first frequency；The DC-DC converter, suitable for the low pass filter coupled, fit
Frequency is less than the low frequency part progress envelope-tracking of first frequency in the envelope signal, obtains same with first signal
First envelope-tracking signal of step.
Optionally, the DC-DC converter is voltage raising and reducing type DC-DC converter.
Optionally, the second envelope-tracking circuit includes：High-pass filter, linear amplifier and switching circuit,
In：The high-pass filter is coupled with the envelope detected circuit, suitable for carrying out high-pass filtering to the envelope signal, is obtained
Frequency is more than the high frequency section of second frequency in the envelope signal；The linear amplifier is coupled with the high-pass filter,
Envelope-tracking is carried out suitable for being more than the high frequency section of second frequency to frequency in the envelope signal, is obtained and first signal
The second synchronous envelope-tracking signal；The switching circuit, with the linear amplifier couple, suitable for second envelope with
When the voltage of track signal is more than the voltage of the first envelope-tracking signal, the second envelope-tracking circuit is closed, by described in
Second envelope-tracking signal is input to the adder.
Optionally, when the first frequency is equal to the second frequency, the first frequency and second frequency are described
The transfer efficiency of DC-DC converter frequency corresponding when being the 70 percent of maximum conversion efficiency.
Optionally, the switching circuit is diode, and the anode of the diode is coupled with the linear amplifier, cathode
It is coupled with the adder.
Optionally, the radio frequency transmitter circuitry further includes：Delay process unit, suitable for believing first envelope-tracking
Number, at least two in the second envelope-tracking signal and the first signal carry out delay process so that the first envelope-tracking letter
Number, the second envelope-tracking signal and the first signal synchronize.
Optionally, the delay process unit includes following at least two delayer：First delayer is coupled to described
Between DC-DC converter and adder, the first envelope-tracking signal suitable for being exported to the DC-DC converter carries out
Delay process；Second delayer is coupled between the linear amplifier and switching circuit, suitable for defeated to the linear amplifier
The the second envelope-tracking signal gone out carries out delay process；Third delayer is coupled to the input direction coupler and described penetrates
Between frequency power amplifier, suitable for carrying out delay process to first signal.
Optionally, the radio frequency transmitter circuitry further includes：It is coupled to the adder and the radio-frequency power is put
Clamp circuit between big device, suitable for carrying out clamper to the voltage of the adder output signal.
The embodiment of the present invention additionally provides a kind of radio frequency sending set, and the radio frequency sending set includes any of the above-described kind of radio frequency
Radiating circuit.
The embodiment of the present invention additionally provides a kind of user terminal, and the user terminal includes any of the above-described kind of radio-frequency transmissions
Machine.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that：
Using the above scheme, it by setting the first envelope-tracking circuit and the second envelope-tracking circuit, is wrapped by described first
Network tracks circuit and carries out envelope-tracking to the low frequency part of the envelope signal, and the second envelope-tracking circuit is to the envelope signal
High frequency section carry out envelope-tracking, by rationally setting the first frequency and second frequency, can improve it is described first packet
Network tracks the transfer efficiency of circuit, can also improve the working efficiency of the radio-frequency power amplifier.
Further, since the transfer efficiency of DC-DC converter at low frequency is higher, in the first envelope-tracking circuit
DC-DC converter and switching circuit are set so that switching circuit is when the voltage of the first envelope-tracking signal is more than threshold voltage
It is closed, and then can envelope-tracking mainly be carried out to envelope signal by DC-DC converter at low frequency, therefore can carry as much as possible
The working efficiency of the high radio-frequency power amplifier.
Further, the frequency separation of the first envelope-tracking circuit and the second envelope-tracking circuit is set to turn for DC-DC
Corresponding frequency during the transfer efficiency maximum of parallel operation, the working efficiency that can cause the radio-frequency power amplifier are maximum.
It further, can be to avoid the electricity because of the second envelope-tracking signal in high-frequency envelope tracking circuit setting clamp circuit
It presses through big and radio-frequency power amplifier is damaged.
Description of the drawings
Fig. 1 is a kind of electrical block diagram of radio frequency transmitter circuitry in the embodiment of the present invention；
Fig. 2 is the electrical block diagram of another radio frequency transmitter circuitry in the embodiment of the present invention；
Fig. 3 is the electrical block diagram of another radio frequency transmitter circuitry in the embodiment of the present invention.
Specific embodiment
At present, generally use DC level (DC-DC) converter to the envelope of signal to be transmitted into line trace, and then to penetrate
Frequency power amplifier provides bias voltage, improves the working efficiency of radio-frequency power amplifier.However, with DC-DC converter work
The raising of working frequency, the switching loss of DC-DC converter is increasing, and the transfer efficiency of DC-DC converter can be caused to drop instead
It is low, the effect for improving radio-frequency power amplifier working efficiency is not achieved.
For DC-DC converter there are the problem of, a kind of improvement project is：DC-DC is replaced to turn using linear amplifier
Parallel operation, that is, the envelope of signal to be transmitted is provided partially into line trace, and then for radio-frequency power amplifier by linear amplifier
Put voltage.But due to the inherently transfer efficiency of linear amplifier it is low the defects of, the program can not be well
Improve the working efficiency of radio-frequency power amplifier.
In view of the above-mentioned problems, the present invention provides a kind of radio frequency transmitter circuitry, the radio frequency transmitter circuitry is provided with simultaneously
First envelope-tracking circuit and the second envelope-tracking circuit, by the first envelope-tracking circuit to the low frequency of the envelope signal
Part carries out envelope-tracking, and the second envelope-tracking circuit carries out envelope-tracking to the high frequency section of the envelope signal, passes through conjunction
Reason setting first frequency and second frequency, can improve the transfer efficiency of the first envelope-tracking circuit, can also improve
The working efficiency of the radio-frequency power amplifier.
It is understandable for above-mentioned purpose, feature and advantageous effect of the invention is enable to become apparent, below in conjunction with the accompanying drawings to this
The specific embodiment of invention explains in detail.
With reference to Fig. 1, an embodiment of the present invention provides a kind of radio frequency transmitter circuitry 1, the radio frequency transmitter circuitry 1 can wrap
It includes：Input direction coupler 11, envelope detected circuit 12, the first envelope-tracking circuit 13, the second envelope-tracking circuit 14, signal
Consolidation circuit 15 and radio-frequency power amplifier 16, wherein：
The input direction coupler 11 is coupled with the envelope detected circuit 12 and radio-frequency power amplifier 16, is suitable for
It is suitable for through the radio-frequency power that signal to be transmitted s0 is separated into the first signal s1 and second signal s2, the first signal s1
The signal that amplifier 16 emits, the second signal s2 is the signal for being adapted to provide for envelope signal s3；
The envelope detected circuit 12 is coupled with the first envelope-tracking circuit 13 and the second envelope-tracking circuit 14,
Suitable for isolating the envelope signal s3 from the second signal s2；
The first envelope-tracking circuit 13, couples with the adder 15, suitable for the envelope signal s3
Low frequency part of the middle frequency less than first frequency f1 carries out envelope-tracking, generates first envelope synchronous with the first signal s1
Track signal n1；
The second envelope-tracking circuit 14, couples with the adder 15, suitable for the envelope signal s3
High frequency section of the middle frequency more than second frequency f2 carries out envelope-tracking, generates second envelope synchronous with the first signal s1
It tracks signal n2, the first frequency f1 and is less than or equal to the second frequency f2；
The adder 15 is coupled with the radio-frequency power amplifier 16, suitable for first envelope-tracking
Signal n1 and the second envelope-tracking signal n2 are merged, and are generated bias voltage and are provided signal p1；
The radio-frequency power amplifier 16, suitable for bias voltage to be provided to the voltage of signal p1 as bias voltage, to institute
Second signal s2 is stated to carry out sending out big rear output.
In specific implementation, the first frequency f1 can the second frequency f2 it is equal, described the can not also be equal to
Two frequency f2.When first frequency f1 is equal with second frequency f2, first envelope-tracking is only set in the radio frequency transmitter circuitry 1
Circuit 13 and second envelope-tracking circuit, 14 two kinds of envelope-tracking circuits.When first frequency f1 and second frequency f2 are unequal,
In addition to the first envelope-tracking circuit and the second envelope-tracking circuit, other envelopes can also be set in the radio frequency transmitter circuitry 1
Circuit is tracked, the envelope signal s3 of frequency is into line trace between first frequency f1 and second frequency f2.Wherein, it is described other
Envelope-tracking circuit can only include an envelope-tracking circuit, can also include multiple envelope-tracking circuits, specific unrestricted
System.And the circuit structure of other envelope-tracking circuits is unrestricted, as long as can be to first frequency f1 and second frequency
The envelope signal s3 of frequency is into line trace between f2.
By rationally setting the first frequency f1 and second frequency f2, it can cause the first envelope-tracking circuit 13
And second envelope-tracking circuit 14 transfer efficiency it is maximum, also can be so that the working efficiency of the radio-frequency power amplifier 16
Highest.
In specific implementation, the first envelope-tracking circuit 13 may have a variety of circuit structures, not be restricted specifically,
As long as envelope-tracking can be carried out to the low frequency part of envelope signal s3.
In one embodiment of this invention, with reference to Fig. 2, the first envelope-tracking electricity 13 can include：Low-pass filter
131 and DC-DC converter 132, wherein：
The low-pass filter 131 is coupled with the envelope detected circuit 12, low suitable for being carried out to the envelope signal s3
Pass filter obtains the low frequency part that frequency in the envelope signal s3 is less than first frequency f1；
The DC-DC converter 132, suitable for being coupled with the low-pass filter 131, suitable for in the envelope signal s3
Frequency less than first frequency f1 low frequency part carry out envelope-tracking, obtain first envelope synchronous with the first signal s1 with
Track signal n1.
When being operated in low frequency due to the DC-DC converter 132, switching loss is smaller, and transfer efficiency is higher, therefore, profit
Envelope-tracking is carried out to the low frequency part of envelope signal s3 with DC-DC converter 132, it is ensured that envelope signal s3 in low frequency
Transfer efficiency during lower progress envelope-tracking.
In specific implementation, the DC-DC converter 132 can include multiple types, such as the DC-DC converter
132 can be step-up DC-DC converters, or buck mode DC-DC converter can also be voltage raising and reducing type DC-DC
Converter.
In specific implementation, the second envelope-tracking circuit 14 may have a variety of circuit structures, not be restricted specifically,
As long as envelope-tracking can be carried out to high frequency section of the frequency in the envelope signal s3 more than second frequency f2.
In one embodiment of this invention, the second envelope-tracking circuit 14 can include：High-pass filter 141, line
Property amplifier 142 and switching circuit 143, wherein：
The high-pass filter 141 is coupled with the envelope detected circuit 12, high suitable for being carried out to the envelope signal s3
Pass filter obtains the high frequency section that frequency in the envelope signal is more than second frequency f2；
The linear amplifier 142 is coupled with the high-pass filter 141, suitable for frequency in the envelope signal s3
High frequency section more than second frequency f2 carries out envelope-tracking, obtains the second envelope-tracking letter synchronous with the first signal s1
Number n2；
The switching circuit 143 is coupled with the linear amplifier 142, suitable in the second envelope-tracking signal n2
Voltage when being more than the voltage of the first envelope-tracking signal n1, the second envelope-tracking circuit is closed, by described second
Envelope-tracking signal n2 is input to the adder 15.
When being operated in high frequency due to linear amplifier 142, transfer efficiency is higher than DC-DC converter 132, therefore, utilizes line
Property amplifier 142 envelope-tracking is carried out to the high frequency section of envelope signal s3, it is ensured that envelope signal s3 is carried out in high frequency
Transfer efficiency during envelope-tracking.
In specific implementation, the switching circuit 143 may have a variety of circuit structures, for example, the switching circuit 143
Can be diode, the anode of the diode is coupled with the linear amplifier 142, cathode and the adder 15
Coupling.
With the raising of working frequency, the transfer efficiency of DC-DC converter 132 continuously decreases, first envelope-tracking
The voltage of signal n1 can also decline therewith.When the voltage of the second envelope-tracking signal n2 is believed more than first envelope-tracking
During the voltage of number n1, the diode 143 is connected, and described by the voltage of the second envelope-tracking signal n2 as supplement
First envelope-tracking signal n1 provides bias voltage for radio-frequency power amplifier 16 jointly so that the work of radio-frequency power amplifier 16
Make efficiency highest.
When working frequency is relatively low, the transfer efficiency of DC-DC converter 132 is higher, the first envelope-tracking signal n1
Voltage be usually above the second envelope-tracking signal n2 voltage.At this point, diode 143 ends, by first envelope
Tracking signal n1 is individually for radio-frequency power amplifier 16 and provides bias voltage.Due to the conversion of DC-DC converter 132 at low frequency
Efficiency is higher, therefore can cause the working efficiency highest of radio-frequency power amplifier 16.
In specific implementation, in order to ensure that radio-frequency power amplifier 16 can work normally, can merge in the signal
Clamp circuit 17 between circuit 15 and the radio-frequency power amplifier 16 is set, electricity is merged to signal by the clamp circuit 17
The voltage that 15 output signals of road, that is, bias voltage provides signal p1 carries out clamper so that the bias voltage provides the electricity of signal p1
Pressure positioned at radio-frequency power amplifier 16 supply voltage between minimum, preventing the bias voltage from providing signal p1
Voltage excessive radio-frequency power amplifier 16 is damaged.
It in specific implementation, can be according to DC-DC converter 132 when first frequency f1 is equal with second frequency f2
Transfer efficiency determines the first frequency f1 and second frequency f2.Under normal conditions, in order to ensure that radio-frequency power amplifier 16 has
Have maximum efficiency, can DC-DC converter 132 transfer efficiency for maximum conversion efficiency 70 percent when it is right
The frequency answered, as the first frequency f1 and second frequency f2.It is of course also possible to other frequency values are set as described first
Frequency f1 and second frequency f2, with specific reference to the practical feelings of the first envelope-tracking circuit 13 and the second envelope-tracking circuit 14
Condition is selected.
In one embodiment of this invention, with reference to Fig. 3, in order to enable the first envelope-tracking signal n1, the second envelope
It tracks signal n2 and the first signal s1 to synchronize, the radio frequency transmitter circuitry 1 can also include：Delay process unit, the delay
Processing unit is suitable for at least two in the first envelope-tracking signal n1, the second envelope-tracking signal n2 and the first signal s1
A carry out delay process so that the first envelope-tracking signal, the second envelope-tracking signal and the first signal synchronize.
In specific implementation, the delay process unit can include the first delayer 181, the second delayer 182 and the
At least two in three delayers 183.Wherein, first delayer 181 is coupled to the DC-DC converter 132 and signal
Between consolidation circuit 15, the first envelope-tracking signal n1 suitable for being exported to the DC-DC converter 132 carries out delay process.
Second delayer 182 is coupled between the linear amplifier 142 and switching circuit 143, suitable for the Linear Amplifer
The second envelope-tracking signal n2 that device 142 exports carries out delay process.The third delayer 183 is coupled to the input direction
Between coupler 11 and the radio-frequency power amplifier 16, suitable for carrying out delay process to the first signal s1.
In specific implementation, the delay process unit can only include the first delayer 181, the second delayer 182 and
Any two in third delayer 183 can also include the first delayer 181, the second delayer 182 and third delayer simultaneously
183.Specifically how to set, can according to the first envelope-tracking signal n1, the second envelope-tracking signal n2 and the first signal s1 it
Between case propagation delays selected.
For example, when the delay process unit can only include the first delayer 181 and the second delayer 182, by first
Delayer 181 carries out delay process to the first envelope-tracking signal n1 so that the first envelope-tracking signal n1 and the first signal s1
It is synchronous, delay process is carried out to the second envelope-tracking signal n2 by the second delayer 182 so that the second envelope-tracking signal n2 with
First signal s1 is synchronized.
For another example, the delay process unit can only include the first delayer 181 and third delayer 183, be prolonged by first
When device 181 to the first envelope-tracking signal n1 carry out delay process so that the first envelope-tracking signal n1 and the second envelope-tracking
Signal n2 is synchronized, and delay process is carried out to the first signal s1 by third delayer 183 so that the first signal s1 and the second envelope with
Track signal n2 is synchronized.
The embodiment of the present invention additionally provides a kind of radio frequency sending set, and the radio frequency sending set can be including any of the above-described kind
Radio frequency transmitter circuitry 1.Processing output is carried out to signal to be launched using the radio frequency transmitter circuitry 1 to antenna.
The embodiment of the present invention additionally provides a kind of user terminal, and the user terminal can include penetrating in above-described embodiment
Channel transmitter.The user terminal can be communicated using the radio frequency sending set with base station or other equipment.
Although present disclosure is as above, present invention is not limited to this.Any those skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (11)
1. a kind of radio frequency transmitter circuitry, which is characterized in that including：Input direction coupler, envelope detected circuit, the first envelope with
Track circuit, the second envelope-tracking circuit, adder and radio-frequency power amplifier, wherein：
The input direction coupler is coupled with the envelope detected circuit and radio-frequency power amplifier, suitable for by letter to be launched
The first signal and second signal number are separated into, first signal is the signal suitable for emitting through the radio-frequency power amplifier,
The second signal is to be adapted to provide for the signal of envelope signal；
The envelope detected circuit is coupled with the first envelope-tracking circuit and the second envelope-tracking circuit, suitable for from described
The envelope signal is isolated in second signal；
The first envelope-tracking circuit is coupled with the adder, suitable for being less than to frequency in the envelope signal
The low frequency part of first frequency carries out envelope-tracking, generates the first envelope-tracking signal synchronous with first signal；
The second envelope-tracking circuit is coupled with the adder, suitable for being more than to frequency in the envelope signal
The high frequency section of second frequency carries out envelope-tracking, generates the second envelope-tracking signal synchronous with first signal, described
First frequency is less than or equal to the second frequency；
The adder is coupled with the radio-frequency power amplifier, suitable for the first envelope-tracking signal and institute
It states the second envelope-tracking signal to merge, generates bias voltage and signal is provided；
The radio-frequency power amplifier suitable for bias voltage to be provided to the voltage of signal as bias voltage, is believed described second
Number carry out sending out it is big after export.
2. radio frequency transmitter circuitry as described in claim 1, which is characterized in that the first envelope-tracking circuit includes：Low pass
Wave filter and DC-DC converter, wherein：
The low-pass filter is coupled with the envelope detected circuit, suitable for carrying out low-pass filtering to the envelope signal, is obtained
Frequency is less than the low frequency part of first frequency in the envelope signal；
The DC-DC converter, suitable for the low pass filter coupled, suitable for frequency in the envelope signal be less than first
The low frequency part of frequency carries out envelope-tracking, obtains the first envelope-tracking signal synchronous with first signal.
3. radio frequency transmitter circuitry as claimed in claim 2, which is characterized in that the DC-DC converter is voltage raising and reducing type DC-
DC converters.
4. radio frequency transmitter circuitry as claimed in claim 2, which is characterized in that the second envelope-tracking circuit includes：High pass
Wave filter, linear amplifier and switching circuit, wherein：
The high-pass filter is coupled with the envelope detected circuit, suitable for carrying out high-pass filtering to the envelope signal, is obtained
Frequency is more than the high frequency section of second frequency in the envelope signal；
The linear amplifier is coupled with the high-pass filter, suitable for being more than second frequency to frequency in the envelope signal
High frequency section carry out envelope-tracking, obtain the second envelope-tracking signal synchronous with first signal；
The switching circuit is coupled with the linear amplifier, suitable for being more than institute in the voltage of the second envelope-tracking signal
When stating the voltage of the first envelope-tracking signal, the second envelope-tracking circuit is closed, the second envelope-tracking signal is defeated
Enter to the adder.
5. radio frequency transmitter circuitry as claimed in claim 4, which is characterized in that when the first frequency is equal to the second frequency
When, the first frequency and the transfer efficiency that second frequency is the DC-DC converter are 7 the percent of maximum conversion efficiency
Corresponding frequency when ten.
6. radio frequency transmitter circuitry as claimed in claim 4, which is characterized in that the switching circuit be diode, two pole
The anode of pipe is coupled with the linear amplifier, and cathode is coupled with the adder.
7. radio frequency transmitter circuitry as claimed in claim 4, which is characterized in that the radio frequency transmitter circuitry further includes：At delay
Unit is managed, suitable for at least two progress in the first envelope-tracking signal, the second envelope-tracking signal and the first signal
Delay process so that the first envelope-tracking signal, the second envelope-tracking signal and the first signal synchronize.
8. radio frequency transmitter circuitry as claimed in claim 7, which is characterized in that the delay process unit includes following at least two
A delayer：
First delayer is coupled between the DC-DC converter and adder, suitable for the DC-DC converter
First envelope-tracking signal of output carries out delay process；
Second delayer is coupled between the linear amplifier and switching circuit, suitable for what is exported to the linear amplifier
Second envelope-tracking signal carries out delay process；
Third delayer is coupled between the input direction coupler and the radio-frequency power amplifier, suitable for described
One signal carries out delay process.
9. radio frequency transmitter circuitry as described in claim 1, which is characterized in that the radio frequency transmitter circuitry further includes：It is coupled to
Clamp circuit between the adder and the radio-frequency power amplifier, suitable for being exported to the adder
The voltage of signal carries out clamper.
10. a kind of radio frequency sending set, which is characterized in that including claim 1~9 any one of them radio frequency transmitter circuitry.
11. a kind of user terminal, which is characterized in that including radio frequency sending set according to any one of claims 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611185845.8A CN108206703B (en) | 2016-12-20 | 2016-12-20 | Radio frequency transmitting circuit, transmitter and user terminal |
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|---|---|---|---|
| CN201611185845.8A CN108206703B (en) | 2016-12-20 | 2016-12-20 | Radio frequency transmitting circuit, transmitter and user terminal |
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| CN103518322A (en) * | 2013-03-26 | 2014-01-15 | 华为技术有限公司 | Digital envelope signal amplification circuit, method and envelope tracking power amplifier |
| WO2015182962A1 (en) * | 2014-05-28 | 2015-12-03 | Samsung Electronics Co., Ltd. | Apparatus and method for removing noise of power amplifier in mobile communication system |
| CN105811893A (en) * | 2016-04-20 | 2016-07-27 | 广东工业大学 | Circuit structure of envelope tracking radio frequency power amplifier |
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