CN105743453B - Polar coordinate transmitter based on SD modulation module - Google Patents
Polar coordinate transmitter based on SD modulation module Download PDFInfo
- Publication number
- CN105743453B CN105743453B CN201610072619.2A CN201610072619A CN105743453B CN 105743453 B CN105743453 B CN 105743453B CN 201610072619 A CN201610072619 A CN 201610072619A CN 105743453 B CN105743453 B CN 105743453B
- Authority
- CN
- China
- Prior art keywords
- power amplification
- amplification unit
- gain
- control data
- power amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003321 amplification Effects 0.000 claims abstract description 97
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 97
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 108700020469 14-3-3 Proteins 0.000 description 1
- 102000004899 14-3-3 Proteins Human genes 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
Landscapes
- Amplifiers (AREA)
Abstract
The present invention discloses a kind of polar coordinate transmitter comprising: input signal progress polar coordinates are converted to phase signal and envelope signal by polar coordinates conversion module；Power amplifier, it includes multiple first kind power amplification units, the second class power amplification unit and third class power amplification unit, the input terminal of each power amplification unit is connected to form the input terminal of power amplifier, the output end of each power amplification unit is connected to form the output end of power amplifier, and phase signal is coupled to the input terminal of power amplifier；SD modulation module, it modulates to obtain power amplifier envelope control data according to envelope signal, power amplifier envelope control data include that the first control data, the second control data and third control data, control first kind power amplification unit, the second class power amplification unit, third class power amplification unit respectively based on these three control data.Compared with prior art, the present invention can save most of power consumptions consumed by power amplifier in the region of low output power.
Description
[technical field]
The present invention relates to field of wireless communication, more particularly to a kind of pole based on SD (Sigma-Delta) modulation module to sit
Mark transmitter.
[background technique]
Modern wireless telecommunication system such as bluetooth enhancing rate (EDR), WLAN and mobile phone all use revocable
Envelope radio frequency signals improve the utilization rate of frequency spectrum.The linear revocable envelope radio frequency signals of amplification need linear power to put
Big device, and their efficiency can be reduced at output power rollback region (back off output power regions).Linearly
The problem of degree and efficiency constrain one another has had extensive research, proposes many methods and carrys out more effective Linear Amplifer.It can be with
By reducing voltage or power amplifier electric current come so that power amplifier (abbreviation power amplifier) keeps efficiency in rollback output power region.
Fig. 1 illustrates traditional polar coordinate transmitter, by envelope detected module (Envelope Detector) and
Limiter (Limiter) resolves into phase signal Vphase (t) and the variation of a constant envelope by input signal Vin is modulated
Envelope signal Venv (t) then respectively efficiently amplifies them.The difficulty that this scheme is realized is that phase signal is logical
Road bandwidth can become wide very much, and the system that the mismatch of phase pathway and envelope path limits these conventional methods is answered
With.
Envelope-tracking (ET, envelope tracking) system is similar to aforementioned schemes but can overcome the problems, such as above-mentioned.
In an ET system comprising power amplifier and power modulation module, power amplifier is usually or linear power is put
Big device, power modulation module restore the envelope of input signal to adjust the voltage of power amplifier.The total efficiency of system is function
Put the product of efficiency and power modulation module efficiency.
Fig. 2 illustrates the structure chart of traditional another polar coordinate transmitter.Wherein, phase signal Phase drives
Some power amplification unit PA1, PA2 ... ..., PA64, digital envelope (Digital Amplitude) pass through decoder
Decoder is switched on and off power amplification unit PA1, PA2 ..., PA64 restores envelope.
Wireless telecommunication system usually requires power control.One system needs under different operating conditions, in certain model
Adjustment output power is enclosed, to reach the interference for saving power consumption and reduction to other users.In traditional a polar coordinates or EER
In (envelope elimination and restoration architectures) system, power amplifier is usually switchtype
Power amplifier, all continuous gains controls all can be used only in envelope modulation module, this makes design more complicated.In an ET
In system, input module and envelop modulator that continuous gain control can simultaneously before power amplifier.However, power amplifier is transmitter
In most consume the module of power consumption, therefore, it is desirable to its gain is adjusted for different output power grades.Additional power from
Scattered control can be realized in the region of low gain by turning off the branch of certain power amplifier.For polar coordinates as shown in Figure 2
It is highly difficult to be directly realized by power control for structure.All digital envelope control words are all already used to indicate the information of envelope, such as
The Unit Amplifier of fruit power amplifier is turned off to realize that power control, equivalent envelope accuracy will be compromised.
Therefore, it is necessary to provide the new technical solution of one kind to solve the above problems.
[summary of the invention]
The purpose of the present invention is to provide a kind of polar coordinate transmitters, can save in the region of low output power most
The power consumption that number is consumed by power amplifier.
To achieve the above object, according to an aspect of the present invention, the present invention provides a kind of polar coordinate transmitter, packet
Include: polar coordinates conversion module is used to modulate input signal progress polar coordinates and is converted to phase signal and envelope signal；
Power amplifier comprising multiple first kind power amplification units, multiple second class power amplification units, one or more thirds
Class power amplification unit, the input terminal of each power amplification unit are connected to form the input terminal of the power amplifier, Ge Gegong
The output end of rate amplifying unit is connected to form the output end of the power amplifier, and the phase signal is coupled to the power and puts
The input terminal of big device, the gain of each first kind power amplification unit is identical, and the gain of each second power amplification unit is mutual
Difference, the gain controllable of third class power amplification unit are one in positive value and negative value；SD modulation module, is used for root
Modulate to obtain power amplifier envelope control data according to the envelope signal, the power amplifier envelope control data include the first control data,
Second control data and third control data, control first kind power amplification unit based on the first control data, are based on second
It controls data and controls the second class power amplification unit, control third class power amplification unit based on third control data.
Further, the first control data bag includes n digit order number, and the one or more in the n digit order number is one corresponding
First kind power amplification unit, enabled, the non-enabled, shutdown and/or unlatching of each first kind power amplification unit are by its correspondence
Digit order number control, the second control data bag includes m digit order number, corresponding one of the one or more in the m digit order number the
Two class power amplification units, enabled, the non-enabled, shutdown and/or unlatching of each second class power amplification unit are corresponding by its
Digit order number controls, and third control data bag includes x digit order number, corresponds to third class power amplification unit, third class function
The gain of rate amplifying unit is that positive value or negative value are controlled by its corresponding digit order number, and wherein n, m, x are oneself more than or equal to 1
So number.
Further, the first control data realize that the second control data are binary code realization with hot code, and third controls number
It is realized according to solid size, it is assumed that the gain of a second class power amplification unit is 1, remaining each second class power amplification unit
Gain is respectively 21, 22... ... 2m。
Further, polar coordinate transmitter further includes phase gain control module, and the phase signal passes through the phase
It is coupled to the input terminal of the power amplifier after gain control module, is used for the phase gain according to input to the phase
Signal carries out gain amplification.
Further, the SD modulation module further includes having control signal, and the gain of the power amplifier is coupled to
The control signal, the SD modulation module are modulated to obtain according to the gain and the envelope signal of the power amplifier
Power amplifier envelope control data.
Further, when the gain of the power amplifier is larger, power amplifier packet that the SD modulation module is modulated
Network control data can enable more power amplification unit, so that the power amplifier supports biggish gain, described
When the gain of power amplifier is smaller, the power amplifier envelope control data that the SD modulation module is modulated can enable less function
Rate amplifying unit, so that the power amplifier supports lesser gain.
Further, the power amplifier envelope control data control being switched on or off for each power amplification unit being enabled
So that the output of the power amplifier can restore to obtain the modulation amplified signal of input signal gain.
Further, when the gain of the power amplifier is lower, the SD modulation module can be by adjusting third control
Data processed control third class power amplification unit, so that third class power amplification unit can be improved the power amplifier
Resolution ratio in low gain area.
Compared with prior art, the present invention exports power amplifier envelope control data by Sigma-Delta modulation module, can be with
Most of power consumptions consumed by power amplifier are saved in the region of low output power.It, can be with simultaneously by sigma-delta modulation module
Maintain envelope signal in the accuracy of low power section.Not so, if not having to sigma-delta modulation module, rough envelope
Signaling protein14-3-3 can generate comparable distortion, and the design of power amplifier can become more sophisticated, and the equal of gain can be more uneven than variation.
[Detailed description of the invention]
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without any creative labor, it can also be obtained according to these attached drawings other
Attached drawing.Wherein:
Fig. 1 is a kind of structural block diagram of traditional traditional polar coordinate transmitter；
Fig. 2 is the structural block diagram of the traditional polar coordinate transmitter of traditional another kind；With
Fig. 3 is the structural block diagram of the polar coordinate transmitter in the present invention.
[specific embodiment]
Detailed description of the invention is mainly by program, step, logical block, process or other symbolistic descriptions come directly
Or the running of simulation technical solution of the present invention indirectly.For the thorough explanation present invention, set forth in following description very
More specific details.And in these no specific details, the present invention then can may be realized still.Technical staff in fields makes
With these descriptions herein and state that the others skilled in the art into fields effectively introduce their work essence.Change sentence
It talks about, for the purpose of the present invention of avoiding confusion, since well known methods and procedures has been readily appreciated that they are not detailed
Thin description.
" one embodiment " or " embodiment " referred to herein, which refers to, may be included at least one implementation of the invention
A particular feature, structure, or characteristic." in one embodiment " that different places occur in the present specification not refers both to same
A embodiment, nor the individual or selective embodiment mutually exclusive with other embodiments.Coupling herein is
Direct or indirect electric connection.
Further reduce the power consumption in low gain to realize the wide power control of range, the invention proposes such as scheme
The structure of polar coordinate transmitter 300 shown in 3.
The polar coordinate transmitter 300 include polar coordinates conversion module 310, SD (Sigma-Delta) modulation module 320,
Phase gain regulates and controls module 330 and power amplifier 340.
The polar coordinates conversion module 310 is converted to phase letter for that will modulate input signal (I, Q) progress polar coordinates
Number Phase and envelope signal envelope.
The phase signal Phase is coupled to the power amplifier 340 after the phase gain control module 330
Input terminal, the phase gain control module 330 is for carrying out the phase signal Phase according to the phase gain of input
Gain amplification.
The power amplifier 340 includes multiple first kind power amplification unit PA11 to PA1n, multiple second class power
Amplifying unit PA21 to PA2m, one or more third class power amplification unit PAQ.The input terminal phase of each power amplification unit
Company forms the input terminal of the power amplifier 340, and the output end of each power amplification unit is connected to form the power amplification
The output end of device 340.The gain of each first kind power amplification unit PA11 to PA1n is identical, each second power amplification unit
The gain of PA21 to PA2m is mutually different.The gain controllable of third class power amplification unit is one in positive value and negative value
It is a.
The SD modulation module 320 according to the envelope signal Envelope for modulating to obtain power amplifier envelope control data
PA Envelope control data, the power amplifier envelope control data include the first control data T data, the second control
Data B data and third control data Q data, control first kind power amplification unit based on the first control data T data
PA11 to PA1n controls the second class power amplification unit PA21 to PA2m based on the second control data B data, is based on third control
Data Q data processed controls third class power amplification unit PAQ.
Finally, each power amplification unit is controlled based on the power amplifier envelope control data, obtains the power amplifier 340
It can restore to obtain the envelope recovery signal after power amplification, i.e. signal of the modulation input signal after power amplification.
In one embodiment, the first control data bag includes n digit order number, one or more of n digit order number pair
Answer a first kind power amplification unit, enabled, the non-enabled, shutdown of each first kind power amplification unit and/or open by
Its corresponding digit order number controls, and the second control data bag includes m digit order number, and the one or more in the m digit order number is corresponding
One the second class power amplification unit, enabled, the non-enabled, shutdown and/or unlatching of each second class power amplification unit are by it
Corresponding digit order number controls, and third control data bag includes x digit order number, corresponds to third class power amplification unit, the
The gain of three classes power amplification unit be positive value or negative value controlled by its corresponding digit order number, wherein n, m, x be greater than etc.
In 1 natural number.First control data T data realizes that second controls data B with hot code (thermal weighting)
Data is binary code (binary weighting) realization, and third controls data and realized with solid size (unary).It is assumed that one
The gain of two class power amplification units is 1, and the gain of remaining each second class power amplification unit is respectively 21, 22... ... 2m。
It can use seldom several second class power by the regulation of binary code by the modulation of SD modulation module 320 in this way and put
Big unit can realize large-scale gain adjustment, for example utilizing gain is 1,21, 22, 23Four the second class power amplifications
Unit, so that it may realize that gain amounts to the gain adjustment of 15 ranks from 1-15.It, can be in addition, regulated and controled by the supplement of hot code
Each power amplification unit of binary code regulation is made up since gain inequality is away from mismatch problems caused by larger.
A power amplification unit is wherein enabled to refer to so that the power amplification unit is in the state that can be worked, at this time
The power amplification unit controls data according to it and is switched on or off.A non-enabled power amplification unit refers to so that the power
Amplifying unit is in idle state, and the power amplification unit will always be in off state at this time.
In addition, the SD modulation module 320 can be by adjusting third when the gain of the power amplifier 340 is lower
Data Q data is controlled to control third class power amplification unit PAQ, so that third class power amplification unit can be improved institute
Power amplifier 340 is stated in the resolution ratio in low gain area.As an example it is assumed that the gain of third class power amplification unit PAQ can
Think+1 and -1, then within continuous five periods, by control third control data Q data make its gain be respectively+
1, -1 ,+1, -1 ,+1, then its average gain can be considered as 1/5=0.2, the control essence of low gain regions is improved in this way
Degree.
In one embodiment, the SD modulation module 320 further includes having control signal, the increasing of the power amplifier
Benefit is coupled to the control signal, gain and the envelope of the SD modulation module 320 according to the power amplifier
Signal modulation obtains power amplifier envelope control data.When the gain of the power amplifier PA is larger, the SD modulation module 320
More power amplification unit can be enabled by modulating obtained power amplifier envelope control data, so that 340, the power amplifier
Biggish gain is held, when the gain of the power amplifier PA is smaller, the SD modulation module 320 modulates obtained power amplifier packet
Network control data can enable less power amplification unit, so that the power amplifier PA supports lesser gain.In this way,
Gain based on power amplifier dynamically adjusts enabled power amplification unit, so that enabled power amplification list
Member can be lucky support described in gain, and turn off those unnecessary power amplification units, in this way can reduction function as far as possible
Consumption.
In conclusion can be saved in the region of low output power by increasing to the gain of power amplifier PA in power control
Save most of power consumptions consumed by power amplifier.By sigma-delta modulation module, envelope signal can be maintained in low power section
Accuracy.Not so, if not having to sigma-delta modulation module, the recovery of rough envelope signal can generate comparable mistake
Very, the design of power amplifier can become more sophisticated, and the equal of gain can be more uneven than variation.
The word that the expressions such as " connection ", " connected " or " connecting " in the present invention are electrically connected all indicate it is electrical indirect or
It is directly connected to.Above description sufficiently discloses a specific embodiment of the invention.It should be pointed out that being familiar with the field
Range of any change that technical staff does a specific embodiment of the invention all without departing from claims of the present invention.
Correspondingly, the scope of the claims of the invention is also not limited only to previous embodiment.
Claims (6)
1. a kind of polar coordinate transmitter, characterized in that it comprises:
Polar coordinates conversion module is used to modulate input signal progress polar coordinates and is converted to phase signal and envelope letter
Number；
Power amplifier comprising multiple first kind power amplification units, multiple second class power amplification units, one or more
Third class power amplification unit, the input terminal of each power amplification unit are connected to form the input terminal of the power amplifier, respectively
The output end of a power amplification unit is connected to form the output end of the power amplifier, and the phase signal is coupled to the function
The gain of the input terminal of rate amplifier, each first kind power amplification unit is identical, the gain of each second power amplification unit
It is mutually different, the gain of third class power amplification unit controllable one in positive value and negative value within each period；
SD modulation module is used to modulate to obtain power amplifier envelope control data, the power amplifier envelope control according to the envelope signal
Data processed include that the first control data, the second control data and third control data, based on the first control data control first
Class power amplification unit controls the second class power amplification unit based on the second control data, based on third control data control the
Three classes power amplification unit,
First control data bag includes n digit order number, the corresponding first kind power amplification of the one or more in the n digit order number
Unit, enabled, the non-enabled, shutdown and/or unlatching of each first kind power amplification unit are controlled by its corresponding digit order number,
Second control data bag includes m digit order number, the corresponding second class power amplification of the one or more in the m digit order number
Unit, enabled, the non-enabled, shutdown and/or unlatching of each second class power amplification unit are controlled by its corresponding digit order number,
Third control data bag includes x digit order number, corresponds to a third class power amplification unit, third class power amplification unit
Gain be that positive value or negative value are controlled by its corresponding digit order number, wherein n, m, x are natural number more than or equal to 1,
When the gain of the power amplifier is lower, the SD modulation module can control data by adjusting third to control the
The gain of three classes power amplification unit is one in positive value and negative value within each period, so that third class power amplification list
Member can be improved the power amplifier in the resolution ratio in low gain area,
First control data realize that the second control data are binary code realization with hot code, and third control data are realized with solid size.
2. polar coordinate transmitter according to claim 1, which is characterized in that it is assumed that second class power amplification unit
Gain is 1, and the gain of remaining each second class power amplification unit is respectively 21, 22... ... 2m。
3. polar coordinate transmitter according to claim 1, which is characterized in that it further includes phase gain control module, institute
The input terminal that phase signal is coupled to the power amplifier after the phase gain control module is stated, is used for according to defeated
The phase gain entered carries out gain amplification to the phase signal.
4. polar coordinate transmitter according to claim 1, which is characterized in that the SD modulation module further includes having control defeated
Enter end, the gain of the power amplifier is coupled to the control signal, and the SD modulation module is according to the power amplification
The gain of device and the envelope signal are modulated to obtain power amplifier envelope control data.
5. polar coordinate transmitter according to claim 4, which is characterized in that larger in the gain of the power amplifier
When, the power amplifier envelope control data that the SD modulation module is modulated can enable more power amplification unit, so that institute
It states power amplifier and supports biggish gain, when the gain of the power amplifier is smaller, the SD modulation module is modulated
To power amplifier envelope control data can enable less power amplification unit so that the power amplifier supports lesser increasing
Benefit.
6. polar coordinate transmitter according to claim 5, which is characterized in that the power amplifier envelope control data control is each
The power amplification unit being enabled be switched on or off so that the output of the power amplifier can restore to obtain modulate it is defeated
Enter the amplified signal of signal gain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610072619.2A CN105743453B (en) | 2016-02-02 | 2016-02-02 | Polar coordinate transmitter based on SD modulation module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610072619.2A CN105743453B (en) | 2016-02-02 | 2016-02-02 | Polar coordinate transmitter based on SD modulation module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105743453A CN105743453A (en) | 2016-07-06 |
| CN105743453B true CN105743453B (en) | 2019-03-19 |
Family
ID=56242219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610072619.2A Active CN105743453B (en) | 2016-02-02 | 2016-02-02 | Polar coordinate transmitter based on SD modulation module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105743453B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849880A (en) * | 2016-12-29 | 2017-06-13 | 中国电子科技集团公司第五十研究所 | Efficient linear digital radio frequency power signal generating method based on polar coordinates treatment |
| CN109714006A (en) * | 2018-12-21 | 2019-05-03 | 中国科学院微电子研究所 | Amplifying device and electronic equipment |
| WO2023077251A1 (en) * | 2021-11-02 | 2023-05-11 | 上海华为技术有限公司 | Polar transmitter and base station |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101320963A (en) * | 2003-08-07 | 2008-12-10 | 株式会社Ntt都科摩 | Power amplifier |
| CN205336235U (en) * | 2016-02-02 | 2016-06-22 | 无锡中感微电子股份有限公司 | Polar coordinates transmitter based on SD modulation module |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101097549B1 (en) * | 2010-05-17 | 2011-12-22 | 삼성전기주식회사 | Digital amplitude modulator and polar transmitter using thereof |
-
2016
- 2016-02-02 CN CN201610072619.2A patent/CN105743453B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101320963A (en) * | 2003-08-07 | 2008-12-10 | 株式会社Ntt都科摩 | Power amplifier |
| CN205336235U (en) * | 2016-02-02 | 2016-06-22 | 无锡中感微电子股份有限公司 | Polar coordinates transmitter based on SD modulation module |
Non-Patent Citations (2)
| Title |
|---|
| A CMOS WCDMA/WLAN Digital Polar Transmitter With AM Replica Feedback Linearization;Shiyuan Zheng等;《IEEE JOURNAL OF SOLID-STATE CIRCUITS》;20130731;第48卷(第7期);第1701-1702页 |
| 极坐标通信功率放大器建模与分析;赵伟星;《大众科技》;20101130(第11期);第11-12页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105743453A (en) | 2016-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9065394B2 (en) | Apparatus and method for expanding operation region of power amplifier | |
| CN104780132B (en) | Envelope method for tracing, radiofrequency launcher and communication unit | |
| US7915961B1 (en) | Power amplifier multiple stage control for polar modulation circuit | |
| JP6408474B2 (en) | Transmitter architecture and related methods | |
| CN105850050B (en) | Envelope-tracking device and method | |
| US10243664B2 (en) | Optical modulator driver circuit and optical transmitter | |
| US9319495B2 (en) | Power amplifier providing high efficiency | |
| US9813088B2 (en) | Supply modulators with voltage and frequency partitioning | |
| US20140155002A1 (en) | Envelope Tracking Signal Bandwidth Control | |
| CN105743453B (en) | Polar coordinate transmitter based on SD modulation module | |
| US8781414B2 (en) | Envelope detector and method for detecting an envelope of a signal to be amplified by a power amplifier | |
| CN106712730A (en) | Programmable gain amplifier capable of adjusting signals | |
| TW200807979A (en) | Multilevel LINC transmitter | |
| CN101167326A (en) | Polar modulation transmission circuit and communication device | |
| CN107210708A (en) | Envelope shaping in envelope-tracking power amplification | |
| CN101394156A (en) | Audio processing system and processing method thereof | |
| CN109417394A (en) | Envelop modulator, envelope tracking power amplifier and communication equipment | |
| US8107904B2 (en) | Apparatus and method for power transmitter in wireless communication system | |
| CN201674469U (en) | Audio-frequency power amplifier circuit with automatic gain control circuit | |
| US8300728B1 (en) | Complex envelope elimination and restoration transmitter | |
| KR20100058189A (en) | Apparatus and method for transmitting signal in a wireless communication system | |
| JP7159325B2 (en) | Transmitter and its method of operation | |
| CN102478873B (en) | Power supply modulator | |
| CN205336235U (en) | Polar coordinates transmitter based on SD modulation module | |
| Walling et al. | Linearizing CMOS switching power amplifiers using supply regulators |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |