CN102723922B - Automatic amplitude control loop and control method thereof - Google Patents
Automatic amplitude control loop and control method thereof Download PDFInfo
- Publication number
- CN102723922B CN102723922B CN201210199741.8A CN201210199741A CN102723922B CN 102723922 B CN102723922 B CN 102723922B CN 201210199741 A CN201210199741 A CN 201210199741A CN 102723922 B CN102723922 B CN 102723922B
- Authority
- CN
- China
- Prior art keywords
- power
- signal
- power amplifier
- amplitude control
- 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
Landscapes
- Amplifiers (AREA)
Abstract
The invention relates to the field of power line carrier communication and discloses an automatic amplitude control loop and a control method thereof. According to the invention, the output power of a power amplifier is subjected to adaptive control by adopting an automatic amplitude control loop, the power amplifier is controlled more accurately and flexibly, the output power and high linearity of the power amplifier are balanced well, constant-power output of a power line carrier communication system can be ensured, and the communication quality of the power line carrier communication system is improved effectively; and a two-way analog to digital converter is adopted, an automatic amplitude control circuit is processed in a numerical field, each parameter of the automatic amplitude control circuit can be configured flexibly, and the control accuracy and the trend range of the automatic amplitude control circuit are improved.
Description
Technical field
The present invention relates to power line carrier communication field, particularly power amplifier output power adaptive control technology.
Background technology
Power-line carrier communication system utilizes power line as communication media, by modulating and demodulating signal, realizes the object utilizing power line transmission data.Because low-voltage power line is laid in order to electric energy transmitting, therefore the load characteristic of power line has very large time variation, in very large range can change along with transmission signal frequency and the change of time.Such as, for the carrier signal meeting European standard EN-50065 standard, its frequency is between 9KHz to 145KHz, and for the carrier signal of this frequency range, the load of power line can change usually between 0.5 ohm to 50 ohm.
Load variations amplitude just because of power line is very large, and the power amplifier in power-line carrier communication system often adopts AB power-like amplifier, or D-type power amplifier, that is, what adopt is all the power amplifier of fixing multiplication factor, therefore, the power output of power amplifier will be caused to change with the change of power line load, this is because:
wherein R
sfor power line load, U
outfor output signal amplitude, P
outfor output signal power.From above-mentioned formula, as amplitude output signal U
outkeep a timing, power line load R
swhen changing greatly, such as, R
swhen changing between 0.5 ohm to 50 ohm, the power output P of power amplifier
outalso constantly change thereupon changing, being so then difficult to the communication performance effectively ensureing power-line carrier communication system.
Therefore, how to improve existing power-line carrier communication system intermediate power amplifier Problems existing, thus make power-line carrier communication system obtain the output of invariable power, improve the communication quality of power-line carrier communication system, become the technical task that those skilled in the art are urgently to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of auto amplitude control loop and control method thereof, more accurate and flexible to the control of power amplifier, best balance point is found between the power output and high linearity of power amplifier, can ensure that power-line carrier communication system obtains the output of invariable power, effectively improve the communication quality of power-line carrier communication system.
For solving the problems of the technologies described above, embodiments of the present invention disclose a kind of auto amplitude control loop, comprise power amplifier, automatic amplitude control circuit and variable gain amplifier;
Automatic amplitude control circuit, for the power output of power amplifier and default target power being compared, and exports corresponding control code to variable gain amplifier according to comparative result;
Variable gain amplifier, for the control code exported according to automatic amplitude control circuit, adjusts the amplitude sending signal, and the signal after adjustment is sent to power amplifier.
Embodiments of the present invention also disclose a kind of control method of auto amplitude control loop, comprise the following steps:
The power output of power amplifier and default target power compare by automatic amplitude control circuit, and export corresponding control code to variable gain amplifier according to comparative result;
Variable gain amplifier adjusts the amplitude sending signal according to control code, and the signal after adjustment is sent to power amplifier.
Compared with prior art, the main distinction and effect thereof are embodiment of the present invention:
Auto amplitude control loop is adopted to carry out adaptive control to the power output of power amplifier, more accurate and flexible to the control of power amplifier, best balance point is found between the power output and high linearity of power amplifier, can ensure that power-line carrier communication system obtains the output of invariable power, effectively improve the communication quality of power-line carrier communication system.
Further, the current signal that automatic amplitude control circuit adopts two-way analog to digital converter to be exported by power amplifier and voltage signal convert digital signal to, automatic amplitude control circuit is processed at numeric field, the various parameters of automatic amplitude control circuit can be configured very neatly, improve precision and the dynamic range of automatic amplitude control circuit control.
Further, because power amplifier adopts High Voltage Power Supply, so the amplitude of oscillation of power amplifier output signal is very large, substantially exceed the quantizing range of automatic amplitude control circuit, the voltage and current that power amplifier exports is input in automatic amplitude control circuit after convergent-divergent again, the dynamic range of automatic amplitude control circuit can be met.
Further, adopt AB power-like amplifier, good compromise can be done between the linearity and efficiency, make power amplifier under the prerequisite providing certain power output, improve the linearity and efficiency as far as possible.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of auto amplitude control loop in first embodiment of the invention;
Fig. 2 is the structural representation of a kind of automatic amplitude control circuit in first embodiment of the invention;
Fig. 3 is the structural representation of a kind of convergent-divergent circuit in first embodiment of the invention;
Fig. 4 is the process of establishing schematic diagram of a kind of auto amplitude control loop in first embodiment of the invention;
Fig. 5 is the schematic flow sheet of the control method of a kind of auto amplitude control loop in second embodiment of the invention.
Embodiment
In the following description, many ins and outs are proposed in order to make reader understand the application better.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations of following execution mode and amendment, also can realize each claim of the application technical scheme required for protection.
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
First embodiment of the invention relates to a kind of auto amplitude control loop.Fig. 1 is the structural representation of this auto amplitude control loop.
Specifically, as shown in Figure 1, this auto amplitude control loop comprises power amplifier 103, automatic amplitude control circuit 104 and variable gain amplifier 102.
Automatic amplitude control circuit 104, for the power output of power amplifier 103 and default target power being compared, and exports corresponding control code to variable gain amplifier 102 according to comparative result.
Further, as shown in Figure 2, this automatic amplitude control circuit 104 comprises:
Current channel analog to digital converter 201, voltage channel analog to digital converter 202, first low pass filter 203, multiplier 204, second low pass filter 205, comparator 206 sum-product intergrator 207.
Current channel analog to digital converter 201, converts digital signal to for the current signal exported by power amplifier 103.
Voltage channel analog to digital converter 202, converts digital signal to for the voltage signal exported by power amplifier 103.
By current channel analog to digital converter 201 and voltage channel analog to digital converter 202, the electric current export power amplifier 103 and voltage signal convert digital signal to, follow-up so all power detection and control are all carried out at numeric field, the various parameters of auto amplitude control loop can be configured very flexibly, as the settling time of loop, the desired value etc. of power output.
First low pass filter 203, carries out low-pass filtering for signal current channel analog to digital converter 201 and voltage channel analog to digital converter 202 exported, removes certain high-frequency interferencing signal.
Multiplier 204, is multiplied with current signal for the voltage signal exported by the first low pass filter 203, obtains the power output of power amplifier 103.
Second low pass filter 205, carries out low-pass filtering for the signal exported by multiplier 204.
Comparator 206, compares with the target power preset for the signal exported by the second low pass filter 205.
Integrator 207, the result for exporting according to comparator 206 is carried out integral processing and is exported corresponding control code to variable gain amplifier 102.
The power output of power amplifier 103 and two target power P1 and P2 compare by comparator 206, the lower limit of the corresponding target power of P1, the upper limit of the corresponding target power of P2.If the power output of power amplifier 103 is greater than target power P2, then the output valve of integrator subtracts 1; If the power output of power amplifier 103 is less than target power P1, then the output valve of integrator adds 1; If the power output of power amplifier 103 is between target power P1 and P2, then the output valve of integrator remains unchanged.When the output valve of each integrator 207 changes, integrator 207 all can export corresponding control code to variable gain amplifier 102, the amplitude sending signal is regulated, the power output of power amplifier 103 also correspondingly changes, until the output valve of integrator 207 remains unchanged, the power output of power amplifier 103 reaches desired value, and therefore auto amplitude control loop ALC needs just can obtain stable power stage certain settling time.
The current signal that automatic amplitude control circuit 104 adopts two-way analog to digital converter 201 and 202 to be exported by power amplifier 103 and voltage signal convert digital signal to, automatic amplitude control circuit 104 is processed at numeric field, the various parameters of automatic amplitude control circuit 104 can be configured very neatly, improve precision and the dynamic range of automatic amplitude control circuit 104.
Variable gain amplifier 102, for the control code exported according to automatic amplitude control circuit 104, adjusts the amplitude sending signal, and the signal after adjustment is sent to power amplifier 103.
The control signal of variable gain amplifier 102 is from the output of automatic amplitude control circuit 104, the amplitude sending signal is controlled, this variable gain amplifier 102 can provide larger dynamic range adjustment, can meet the requirement of different loads situation to output amplitude.
Also comprise in this auto amplitude control loop: digital to analog converter and the 3rd low pass filter, as shown in 301 in Fig. 1.
Digital to analog converter, for realizing the digital-to-analogue conversion sending signal, and exports to the 3rd low pass filter by the signal after conversion.
3rd low pass filter, carries out low-pass filtering for the signal exported by digital to analog converter, and filtered signal is exported to variable gain amplifier.
Power amplifier 103 is power amplifiers of power-line carrier communication system, is used for driving power line load, and dynamic rate amplifier 103, under the prerequisite providing certain power output, should improve the linearity and efficiency as far as possible, between the linearity and efficiency, find balance point.The output of power amplifier 103 is connected in power line load, and due to the change of power line load, the voltage signal that power amplifier 103 exports and current signal also corresponding change can occur.
Because power amplifier 103 adopts High Voltage Power Supply, so the amplitude of oscillation that power amplifier 103 outputs signal is very large, substantially exceed the quantizing range of automatic amplitude control circuit 104.
Therefore, also comprise in this auto amplitude control loop: convergent-divergent circuit, be connected between power amplifier 103 and automatic amplitude control circuit 104, for being input in automatic amplitude control circuit 104 after voltage signal that power amplifier 103 is exported and current signal convergent-divergent.
The voltage and current exported by power amplifier 103 is input in automatic amplitude control circuit 104 after convergent-divergent again, can meet the dynamic range of automatic amplitude control circuit 104.
Specifically, as shown in Figure 3, this convergent-divergent circuit comprises: transformer circuit 301, first electric capacity C1, the second electric capacity C2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance Rsense and Voltage Reference VCM.
The output (the A point namely in Fig. 3) of power amplifier is by transformer circuit 301 and the 4th resistance Rsense ground connection.
The output (the A point namely in Fig. 3) of power amplifier is connected with the voltage channel analog to digital converter 202 of automatic amplitude control circuit 104 with the first resistance R1 by the first electric capacity C1.
Voltage Reference VCM is connected with the voltage channel analog to digital converter 202 of automatic amplitude control circuit 104 by the second resistance R2.
The ungrounded end (the B point namely in Fig. 3) of the 4th resistance Rsense is connected with the current channel analog to digital converter 201 of automatic amplitude control circuit 104 by the second electric capacity C2.
Voltage Reference VCM is connected with the current channel analog to digital converter 201 of automatic amplitude control circuit 104 by the 3rd resistance R3.
As shown in Figure 3, node A is the voltage signal output end of power amplifier 103, in order to be connected with automatic amplitude control circuit 104, the voltage signal to exporting is needed to carry out certain convergent-divergent to meet the dynamic range of voltage channel analog to digital converter 202 in automatic amplitude control circuit 104.The potential-divider network that resistance R1 and R2 forms completes the convergent-divergent to output voltage, and zoom factor is relevant with the output power of automatic amplitude control circuit 104, considers so need to coordinate automatic amplitude control circuit 104 to do compromise.Electric capacity C1 is capacitance, the AC signal coupling in power amplifier 103 output voltage come, and the DC point of automatic amplitude control circuit 104 is provided by Voltage Reference VCM.Node B is the output of power amplifier 103 current channel, and the electric current that power amplifier 103 exports flows to ground through power line equivalent load and Rsense.Rsense is the current detection circuit of power amplifier 103, be used for the current conversion that power amplifier 103 exports to become voltage signal and the current channel analog to digital converter 201 delivered in automatic amplitude control circuit 104 is measured, therefore, resistance Rsense needs to be limited in certain scope and just can obtain reasonable current measurement precision.
After voltage signal and current signal enter automatic amplitude control circuit 104, the power output of automatic amplitude control circuit 104 meeting monitor power amplifier 103 also compares with a target power and exports set of number control code to variable gain amplifier 102, thus change the amplitude of variable gain amplifier 102, the change of variable gain amplifier 102 output amplitude can cause the change of power amplifier 103 power output, power output after power amplifier 103 changes compares with target power again, thus again changes the output amplitude of variable gain amplifier 102.Whole loop constantly adjusts, until the power output of power amplifier 103 is in the scope of target power, this auto amplitude control loop enters stable state.Power amplifier 103 carries out constant power output, and the target zone adjustment of the adjustment settling time of power amplifier 103 and step-length and power output can design flexibly and configure in automatic amplitude control circuit 104.Can carry out flexible configuration according to the concrete condition of power line carrier communication in application, to meet power line in underloading, heavy duty and nearly remote communication requirement, improve communication quality.
Fig. 4 is the process of establishing schematic diagram of this auto amplitude control loop, a power output of the corresponding power amplifier 103 of each rate-determining steps of automatic amplitude control circuit 104, after auto amplitude control loop stability, power amplifier 103 reaches final power output, due to the employing of auto amplitude control loop, power amplifier 103, while reaching optimum power stage, the output of guaranteed output amplifier 103 can have certain linearity.In addition, settling time of auto amplitude control loop and adjustment step-length can programming Control, and the power output of power amplifier 103 also can be configured according to the requirement of practical application, achieves the adjustment of maximum flexibility.
Preferably, in the present embodiment, power amplifier 103 is AB power-like amplifier.
Adopt AB power-like amplifier, good compromise can be done between the linearity and efficiency, make power amplifier under the prerequisite providing certain power output, improve the linearity and efficiency as far as possible.
Certainly, in some other execution mode of the present invention, the power amplifier of other type can also be selected.
Preferably, in the present embodiment, this auto amplitude control loop, is applied in power-line carrier communication system.
Similarly, in some other execution mode of the present invention, this auto amplitude control loop also can be applied in other Circuits System.
Auto amplitude control loop is adopted to carry out adaptive control to the power output of power amplifier, more accurate and flexible to the control of power amplifier, best balance point is found between the power output and high linearity of power amplifier, can ensure that power-line carrier communication system obtains the output of invariable power, effectively improve the communication quality of power-line carrier communication system.
Second embodiment of the invention relates to a kind of control method of auto amplitude control loop.Fig. 5 is the schematic flow sheet of the control method of this auto amplitude control loop.
Specifically, as shown in Figure 5, the control method of this auto amplitude control loop comprises the following steps:
In step 501, the power output of power amplifier and default target power compare by automatic amplitude control circuit.
Before step 501, further comprising the steps of:
The current signal export power amplifier and voltage signal convert digital signal to.
The current signal and voltage signal that convert digital signal to are carried out low-pass filtering.
Voltage signal after low-pass filtering is multiplied with current signal, obtains the power output of power amplifier.
The power output of power amplifier is carried out low-pass filtering.
After this enter step 502, automatic amplitude control circuit exports corresponding control code to variable gain amplifier according to comparative result.
In step 501 and 502, comprise following sub-step:
The power output of power amplifier and the target power preset compare by comparator:
If the power output of power amplifier is greater than the first thresholding, then the output valve of integrator subtracts 1;
If the power output of power amplifier is less than the second thresholding, then the output valve of integrator adds 1;
If the power output of power amplifier is between the first thresholding and the second thresholding, then the output valve of integrator remains unchanged.
After this enter step 503, variable gain amplifier adjusts the amplitude sending signal according to control code.
After this enter step 504, the signal after adjustment is sent to power amplifier by variable gain amplifier.
After this process ends.
Present embodiment is the method execution mode corresponding with the first execution mode, and present embodiment can be worked in coordination with the first execution mode and be implemented.The relevant technical details mentioned in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.
Each method execution mode of the present invention all can realize in modes such as software, hardware, firmwares.No matter the present invention realizes with software, hardware or firmware mode, instruction code can be stored in the addressable memory of computer of any type (such as permanent or revisable, volatibility or non-volatile, solid-state or non-solid, fixing or removable medium etc.).Equally, memory can be such as programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc, be called for short " DVD ") etc.
Although by referring to some of the preferred embodiment of the invention, to invention has been diagram and describing, but those of ordinary skill in the art should be understood that and can do various change to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (6)
1. an auto amplitude control loop, is characterized in that, comprises power amplifier, automatic amplitude control circuit and variable gain amplifier;
Automatic amplitude control circuit, for the power output of power amplifier and default target power being compared, and exports corresponding control code to variable gain amplifier according to comparative result;
Variable gain amplifier, for the control code exported according to automatic amplitude control circuit, adjusts the amplitude sending signal, and the signal after adjustment is sent to power amplifier;
Also comprise: digital to analog converter and the 3rd low pass filter;
Digital to analog converter, for realizing the digital-to-analogue conversion sending signal, and exports to the 3rd low pass filter by the signal after conversion;
3rd low pass filter, carries out low-pass filtering for the signal exported by digital to analog converter, filter out-band external noise, and filtered signal is exported to variable gain amplifier;
Described automatic amplitude control circuit comprises:
Current channel analog to digital converter, voltage channel analog to digital converter, the first low pass filter, multiplier, the second low pass filter, comparator sum-product intergrator;
Current channel analog to digital converter, converts digital signal to for the current signal exported by power amplifier;
Voltage channel analog to digital converter, converts digital signal to for the voltage signal exported by power amplifier;
First low pass filter, carries out low-pass filtering for signal current channel analog to digital converter and voltage channel analog to digital converter exported;
Multiplier, is multiplied with current signal for the voltage signal exported by the first low pass filter, obtains the power output of power amplifier;
Second low pass filter, carries out low-pass filtering for the power signal exported by multiplier;
Comparator, compares with the target power preset for the signal exported by the second low pass filter;
Integrator, the result for exporting according to comparator is carried out integration and is exported corresponding control code to variable gain amplifier.
2. auto amplitude control loop according to claim 1, it is characterized in that, also comprise: convergent-divergent circuit, be connected between power amplifier and automatic amplitude control circuit, for being input in automatic amplitude control circuit after voltage signal that power amplifier is exported and current signal convergent-divergent.
3. auto amplitude control loop according to claim 2, is characterized in that, described convergent-divergent circuit comprises: transformer circuit, the first electric capacity, the second electric capacity, the first resistance, the second resistance, the 3rd resistance, the 4th resistance and Voltage Reference;
The output of power amplifier is by transformer circuit and the 4th grounding through resistance;
The output of power amplifier is connected with the voltage channel analog to digital converter of automatic amplitude control circuit with the first resistance by the first electric capacity;
Voltage Reference is connected with the voltage channel analog to digital converter of automatic amplitude control circuit by the second resistance;
The ungrounded end of the 4th resistance is connected with the current channel analog to digital converter of automatic amplitude control circuit by the second electric capacity;
Voltage Reference is connected with the current channel analog to digital converter of automatic amplitude control circuit by the 3rd resistance.
4. auto amplitude control loop according to claim 3, is characterized in that, described power amplifier is AB power-like amplifier.
5. auto amplitude control loop according to claim 4, is characterized in that, this auto amplitude control loop, is applied in power-line carrier communication system.
6. a control method for auto amplitude control loop, is characterized in that, comprises the following steps:
The power output of power amplifier and default target power compare by automatic amplitude control circuit, and export corresponding control code to variable gain amplifier according to comparative result;
Variable gain amplifier adjusts the amplitude sending signal according to described control code, and the signal after adjustment is sent to power amplifier;
The amplitude sending signal is adjusted according to described control code at described variable gain amplifier, and before the signal after adjustment is sent to the step of power amplifier, further comprising the steps of:
Digital-to-analogue conversion is carried out to transmission signal, and the signal after conversion is exported to the 3rd low pass filter;
The signal that digital to analog converter exports is carried out low-pass filtering, filter out-band external noise, and filtered signal is exported to variable gain amplifier;
The current signal export power amplifier and voltage signal convert digital signal to;
The current signal and voltage signal that convert digital signal to are carried out low-pass filtering;
Voltage signal after low-pass filtering is multiplied with current signal, obtains the power output of power amplifier;
The power output of power amplifier is carried out low-pass filtering;
At described automatic amplitude control circuit, the power output of power amplifier and default target power are compared, and export corresponding control code in the step of variable gain amplifier according to comparative result, comprise following sub-step:
The power output of power amplifier and the target power preset compare by comparator;
If the power output of power amplifier is greater than the first thresholding, then the output valve of integrator subtracts 1;
If the power output of power amplifier is less than the second thresholding, then the output valve of integrator adds 1;
If the power output of power amplifier is between the first thresholding and the second thresholding, then the output valve of integrator remains unchanged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199741.8A CN102723922B (en) | 2012-06-15 | 2012-06-15 | Automatic amplitude control loop and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199741.8A CN102723922B (en) | 2012-06-15 | 2012-06-15 | Automatic amplitude control loop and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102723922A CN102723922A (en) | 2012-10-10 |
| CN102723922B true CN102723922B (en) | 2015-01-21 |
Family
ID=46949610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210199741.8A Active CN102723922B (en) | 2012-06-15 | 2012-06-15 | Automatic amplitude control loop and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102723922B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5993174B2 (en) * | 2012-03-26 | 2016-09-14 | ラピスセミコンダクタ株式会社 | Data receiving circuit and data receiving method |
| TWI530112B (en) * | 2012-12-21 | 2016-04-11 | 光寶電子（廣州）有限公司 | Power line communications device, power line communications system, and monitoring power method thereof |
| CN103236874A (en) * | 2013-05-14 | 2013-08-07 | 北京华强智连微电子有限责任公司 | Power transmission device of OFDM (orthogonal frequency division multiplexing) power line carrier communication |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1667945A (en) * | 2005-04-01 | 2005-09-14 | 深圳市惠天通信技术有限公司 | Linear audio power amplifying system with predistortion |
| CN101192862A (en) * | 2006-11-30 | 2008-06-04 | 昂达博思公司 | Method and device for automatic gain control in wireless communication system |
| CN101227176A (en) * | 2007-01-19 | 2008-07-23 | 联发科技股份有限公司 | Gain control system and calibration method thereof |
| CN101420209A (en) * | 2008-11-21 | 2009-04-29 | 北京时代民芯科技有限公司 | High speed large dynamic range digital automatic gain control circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100683008B1 (en) * | 2005-12-07 | 2007-02-15 | 한국전자통신연구원 | Apparatus for automatic gain control in cable modem, and lock-time derivation method of using it |
-
2012
- 2012-06-15 CN CN201210199741.8A patent/CN102723922B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1667945A (en) * | 2005-04-01 | 2005-09-14 | 深圳市惠天通信技术有限公司 | Linear audio power amplifying system with predistortion |
| CN101192862A (en) * | 2006-11-30 | 2008-06-04 | 昂达博思公司 | Method and device for automatic gain control in wireless communication system |
| CN101227176A (en) * | 2007-01-19 | 2008-07-23 | 联发科技股份有限公司 | Gain control system and calibration method thereof |
| CN101420209A (en) * | 2008-11-21 | 2009-04-29 | 北京时代民芯科技有限公司 | High speed large dynamic range digital automatic gain control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102723922A (en) | 2012-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU754082B2 (en) | Amplifier circuit | |
| US7538631B2 (en) | Multi-mode amplitude modulator control method | |
| KR102162776B1 (en) | Envelope tracking modulator with feedback | |
| CN109347513B (en) | bidding procurement information calibration circuit | |
| CN103813596B (en) | The method of LED drive circuit and reduction LED current ripple | |
| KR20080003902A (en) | A parallel arranged linear amplifier and dc-dc converter | |
| KR20150118171A (en) | Improved voltage boost for et modulator | |
| KR20150117681A (en) | Improved resonance suppression for envelope tracking modulator | |
| WO2017195066A1 (en) | Power converter with robust stable feedback | |
| CN106571787A (en) | Digital-analog hybrid automatic gain control amplifier | |
| CN102723922B (en) | Automatic amplitude control loop and control method thereof | |
| EP2965413B1 (en) | Transfer function generation based on pulse-width modulation information | |
| JP2016505230A (en) | Improved efficiency of the linear amplifier of the envelope tracking modulator | |
| TW201404018A (en) | Feedback control circuit of power converter and power converter system using same | |
| CN102403901A (en) | Controllers for power converters and control method | |
| CN106357090B (en) | Power supply device for power amplifier | |
| CN109768693B (en) | Current sharing control method, device and system and computer readable storage medium | |
| WO2012078895A2 (en) | Sigma-delta difference-of-squares rms-to-dc converter with multiple feedback paths | |
| US7468636B2 (en) | Radio frequency power amplifier | |
| CN203933540U (en) | A kind of amplifier | |
| CN106411321B (en) | Optimized analog signal Conditioning circuit and working method thereof | |
| EP3721555B1 (en) | An amplifier with an at least second order filter in the control loop | |
| CN107070426B (en) | Amplifier and implementation method thereof | |
| JP6809703B2 (en) | Class D power amplifier | |
| US20080012633A1 (en) | Digital controlled filter system and filtering method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |