CN1695297A - Power amplifying device for communication system - Google Patents
Power amplifying device for communication system Download PDFInfo
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- CN1695297A CN1695297A CN03824667.8A CN03824667A CN1695297A CN 1695297 A CN1695297 A CN 1695297A CN 03824667 A CN03824667 A CN 03824667A CN 1695297 A CN1695297 A CN 1695297A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/60—Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
- H03F3/602—Combinations of several amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0294—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using vector summing of two or more constant amplitude phase-modulated signals
Abstract
A power-amplifying device for a communication system is disclosed. It comprises a decomposer, two D/A converters, two power amplifiers and a signal combiner. It further includes another power amplifier before the decomposer and a power detection & gain factor calculation device that measures the average power of the source signal of the power-amplifying device and adjusts the gain factors of the three power amplifiers accordingly. With this power amplifying device, a complex network is not needed to compensate for amplifier imbalance and neither is a complex measurement device required to measure the absolute performance of every component. With this invention, lighter power cables can be used, fewer backup batteries are needed, and fewer heat sinks are needed. Also, the gain factors of the amplifiers can be adjusted by changing their DC supply voltage. This will reduce their power consumption.
Description
Technical field
The present invention relates to a kind of signal transmission system, or rather, relate to a kind of power amplifier device that is used for communication system.
Background technology
Final step in the communication system is that low-power signal is amplified to the power that can satisfy the transmission medium needs.For example, in radio communication transmitter, the through-put power that the power wireless channel of 1 milliwatt may need but the source information signal can be had an appointment is up to ten thousand times of source signal, reaches 10 watts.Resemble and thisly be called as power amplification from low-power signal to high-power amplification process, (PA) realizes with power amplifier.
Power amplifier has some very harsh requirements.It is the amplifying signal source exactly, does not allow to make the source signal distortion, can not transmit the energy outside the signal source frequency scope, and it must operate within the whole frequency band of source signal, and it must satisfy top requirement in very high efficiency mode.For fixed structure and treatment technology, traditional method is to consider balance between frequency band, efficient and linearity.The performance of improving a kind of parameter must reduce the performance of another kind of parameter.
Past, come modulating information signal in the mode that is easy to amplify after the modulation, can avoid the design problem of (not solving) power amplifier.Such as, can be amplified its power with C class A amplifier A cheaply and efficiently by FM (frequency modulation) modulated digital source signal.Unfortunately, nowadays the modulation scheme that is easy to amplify is not widely adopted because these modulation schemes generally or aspect frequency spectrum efficient low (for example FM) or aspect the utilizing of its through-put power efficient low (for example AM (amplitude modulation)).
Resemble the so modern modulation scheme of QAM (quadrature amplitude modulation) and do not use any skill, and power amplification also becomes inevitable problem.Modern transmitter must can receive wide bandwidth signals, and wherein information is carried in the amplitude and phase place that transmits signal.
Proposed several structures construct a kind of effectively, wide bandwidth, linear amplifier, wherein a kind of structure is called as the LINC structure, the linear amplifier of non-linear element is used in its representative.This structure also is known as " outphaser " and " Chireix ".
As shown in Figure 1, the basic principle of LINC structure is that digital source signal s (n) device 10 that is decomposed is decomposed into s
1(n) and s
2(n) two digital component signals make: s (n)=s
1(n)+s
2(n).Two component signal s
1(n) and s
2(n) all have such character, for all n values, their amplitude is constant always.Look regardless of digital source signal s (n) how much power of digital source signal s (n) is, digital component signal s
1(n) and s
2(n) amplitude (thereby power) remains identical.In brief, include the digital source signal s (n) of amplitude and phase change, be broken down into two signals that phase change is only arranged.
Following formula has been described the operation of signal decomposition, and the amplitude of hypothesis digital source signal s (n) is limited to be equal to or less than 1.
These two digital component signal s
1(n) and s
2(n) be converted to two analog signal s by first digital to analog converter 11 and second digital to analog converter 12
1(t) and s
2(t).More desirably, by modulator 13, these two analog signal s
1(t) and s
2(t) be modulated onto desirable carrier frequency fc.
Modulating later signal is amplified by first power amplifier 15 and second power amplifier 16 respectively.Amplify later signal x
1(t) and x
2(t) utilize signal synthesizer 17 to synthesize, thereby obtain output signal x (t), go out by antenna transmission.
The reason why this structure receives publicity is, though it needs two power amplifiers, but have the feature that is easy to amplify owing to enter into the signal of these power amplifiers, so compared with single power amplifier, the power amplifier in this structure is highly susceptible to structure.Especially, entering into the signal that power sends out device big is to amplify with simple, cheap amplifier (such as but being not limited only to C type amplifier), and amplitude is the signal of constant.
In the reality, this structure only has limited purposes, and its reason is because it is very responsive to gain between two amplifiers and unbalance in phase.Example shown in Fig. 2 a, the scope of X-axis is from-fs/2 to+fs/2, and wherein fs represents the sampling rate of digital to analog converter, equals digital source signal s (n) and two component signal s simultaneously
1(n) and s
2(n) sampling rate.With the Y-axis of x (ζ) expression, measure with dB (decibel), very effective for relative measurement.For example, since, we can say noise energy so in the position of 0dB, passband begins to occur being lower than passband 30dB place.Fig. 2 b has shown the amplification result of passband among Fig. 2 a.Among Fig. 2 b the scope of X-axis from approximately-0.025fs/2 is to about 0.3fs/2.The drawing result that two curves among Fig. 2 a and Fig. 2 b are identical datas, but ratio difference.
As can be seen, the gain imbalance of 0.25dB has caused out-of-band noise to begin to occur being lower than passband 30dB place from Fig. 2 a and 2b.
In addition, for a given gain imbalance, the noise of introducing is not to be directly proportional with input power.For example, have in the above in the scheme of a full power source signal, the outer emission of frequency band is present in the following 30dB of passband place.If source power decline 12dB (for example), the outer emission of the frequency band 12dB that can not descend.They can be stabilized in fixing absolute power level.So frequency band is launched the position of meeting 18dB under passband outward.
Fig. 3 a has shown that source signal, M signal are (by the synthetic signal s of two analog signals
1(t)+s
2(t)) and be used for relation between the output signal x (t) of the conventional power amplifier apparatus of communication system, wherein, digital source signal is the total power source signal.Fig. 3 b has shown that source signal, M signal are (by the synthetic signal s of two analog signals
1(t)+s
2(t)) and be used for relation between the conventional power amplifier device output signal x (t) of communication system, wherein, digital source signal is the weak source signal.In Fig. 3 a and 3b, what two pulsation lines showed is the output noise of introducing.
As can be seen, the output noise of introducing always is superimposed upon on the absolute power level from Fig. 3 a and 3b, and is irrelevant with the performance number of input.This is because noise and the analog signal s that the amplifier imbalance causes
1(t) and s
2(t) power is relevant.The power of these signals is constants, so the noise that is caused by the amplifier imbalance also can be a constant.It does not depend on the intensity of input signal.
So, because noise is not along with the power of source signal fluctuates, so be not only dBc (with respect to the decibels of carrier wave) requirement to transmission to the requirement of out-of-band noise.In fact, this requirement comprises the dBc requirement, and adds the dynamic range of desirable output signal.If it is 30dBc with the outer requirement of radiating of time-frequency band that the average power of output signal estimates to change 20dB, the noise that is caused by the amplifier imbalance must be in the position of the following 50dBc of peak power output so.
This tender subject that produces for the gain imbalance, usually solve by following approach, the imbalance of perhaps utilizing complex network to come compensated amplifier perhaps utilizes complex measurement device to measure the performance of each parts, thereby guarantees only to adopt the device with similar performance.
The other problem of this structure is that two amplifiers are always operating under the flat-out state.For example, if need 20 watts in antenna, then each amplifier can produce 10 watts and all energy and can be sent to antenna.Yet iff 1 watt of needs, each amplifier is still exported 10 watts.Antenna is sent out 1 watt, remaining 19 watts will be wasted and in synthesizer the form with heat dissipate.
Amplifier must operate at the efficient that this fact of full power state has reduced amplifier, and needs jumbo grid line to supply with required power, needs to use big reserve battery, also needs to use radiator in synthesizer.
Summary of the invention
The purpose of this invention is to provide a power amplifier device that is used for communication system and solve the above-mentioned problems in the prior art, wherein, the imbalance that does not need complicated network to come compensated amplifier, do not need complex measurement device to measure the absolute performance of each power amplifier, the energy consumption of power amplifier is lowered, utilize the more power network winding thread of low capacity, need littler/still less reserve battery, and can use littler radiator.
In order to achieve the above object, provide a power amplifier device.According to the present invention, the power amplifier device that is used for communication system comprises a decomposer, is used for digital source signal is decomposed into first digital component signal and second digital component signal; First digital to analog converter is used for first digital component signal is converted into first analog signal; Second digital to analog converter is used for second digital component signal is converted to second analog signal; First power amplifier is used to amplify first analog signal to obtain first amplifying signal; Second power amplifier is used to amplify second analog signal to obtain second amplifying signal; A signal synthesizer is used to make up first amplifying signal and second amplifying signal, obtains the output signal by antenna transmission.The power amplifier device that is used for communication system also comprises power detection and gain factor calculation device and the 3rd amplifier, is used for and will be amplified by the digital signal of described destroyer breaks down; The calculation element of described power detection and gain coefficient detects the performance number of described digital signal, according to the performance number of detected described digital signal, regulate the gain coefficient of the 3rd Amplifier Gain coefficient and first power amplifier and second power amplifier.
In brief, the present invention relates to increase a circuit that can be used to measure the average power of digital source signal and calculate two gain coefficients, increase a gain apparatus, and two power amplifiers are increased gain controlling in the decomposer front.
In operation, be low if power detection and gain factor calculation device detect the power of digital source signal, increase is transported to the gain of decomposer signal, thereby decomposer always receives full power signal.On the one hand, first and second amplifiers can reduce their gain coefficient in addition, and its amount that reduces is identical with the recruitment of the gain of the signal that enters decomposer, thereby the overall gain coefficient of system is remained unchanged.
Like this, amplifier will always utilize the total power of two amplifiers to produce signal.The noise that amplifier increases will be always with respect to full power signal, and is irrelevant with the power of input signal.Therefore because at output is not to need total power always, with the gain coefficient of regulatory work rate amplifier, signal power and noise power are reduced to the delivering power value of requirement.
In this case, the requirement of balance has been lowered between the pair amplifier.The example that continuation had before been mentioned, even input power has the dynamic range of 20dB, the requirement of pair amplifier balance still only is 30dB.The balance of amplifier is taken adjacent channel noise into account, and power detection and gain factor calculation device will be taken the increase and the reduction of signal power and noise power into account.
Like this, do not need complicated network to remedy the imbalance of amplifier.Simultaneously do not need complex measurement device to measure the absolute performance of each power amplifier yet.
Furthermore, change DC (direct current) supply voltage of amplifier, gain coefficient that can resonance-amplifier.Also can reduce simultaneously their power consumption.For example, if antenna only needs 1 watt power, thereby the DC power supply of power amplifier will reduce and only produces 1 watt gross power so.In conventional structure, if only need 1 watt, power amplifier still can produce 9 watts power.
Like this, because the efficient of power amplifier has improved, need not the witched-capacity network line desired power is provided.The size of reserve battery has reduced.And, also avoided in synthesizer requirement to radiator.
Description of drawings
Shown in Figure 1 is the schematic diagram that is used for the conventional power amplifier device of communication system;
Shown in Fig. 2 a and Fig. 2 b is the conventional power amplifier device that is used for communication system, because the curve chart of the out-of-band noise that the gain imbalance of two power amplifiers causes;
Shown in Fig. 3 a is relation between source signal, M signal and the output signal that is used for the conventional power amplifier device of communication system, and wherein digital source signal is a total power source signal;
Shown in Fig. 3 b is relation between source signal, M signal and the output signal that is used for the conventional power amplifier device of communication system, and wherein digital source signal is weak power source signal;
Shown in Figure 4 is the schematic diagram that is used for the power amplifier device of communication system according to of the present invention;
Fig. 5 (a) is to shown in Fig. 5 (d) being that wherein, digital source signal is weak power source signal according to the relation between source signal, M signal, out-of-band noise and the output signal that is used for the power amplifier device of communication system of the present invention.
Embodiment
Shown in Figure 4 is one according to the schematic diagram that is used for the power amplifier device of communication system of the present invention.Preferably, the digital source signal that is used for the power amplifier device of communication system is the total power input signal.For example, if the peak power of hypothesis digital source signal is 0dB, the ratio of supposing power peak and mean value simultaneously is 10dB, and the maximum average value of input power is-10dB.Based on such Mean Input Power, the gain of selective amplifier makes power output equal the desired value of power output on wattage.For example, if the power output of wishing is 10 watts or 40dBm (dBm),, will produce the performance number of this quantity when input signal power is during at-10dB.
As shown in Figure 4,, comprise one the 3rd amplifier 22, be used for amplifier digital source signal s (n), and the digital source signal that produces an amplification sends decomposer 10 to as input signal according to the communication system power amplifier device that is used for of the present invention.
Decomposer 10 is decomposed into the first digital component signal s with the digital source signal of amplifying
1(n) and the second digital component signal s
2(n).
First digital to analog converter 11 is with the first digital component signal s
1(n) be converted to the first analog signal s
1(t).
Second digital to analog converter 12 is with the second digital component signal s
2(n) be converted to the second analog signal s
2(t).
Modulator 13 is modulated the first analog signal s respectively
1(t) and the second analog signal s
2(t), to become the first modulation signal m
1(t) and the second modulation signal m
2(t), each modulation signal has desirable carrier frequency fc.
First power amplifier 15 amplifies the first modulation signal m
1(t), to obtain the first amplifying signal x
1(t).
Second power amplifier 16 amplifies the second modulation signal m
2(t), to obtain the second amplifying signal x
2(t).
Signal synthesizer 17 first amplifying signal of combination x
1(t) and second amplifying signal x
2(t), to obtain one with the output signal x (t) that is transmitted.
It should be noted that modulator 13 is optional.Even the value of desirable carrier frequency fc is zero, the power amplifier device that is used for communication system still can be worked.In other words, modulation operations does not influence the performance of power amplifier device at all, is that OHz and carrier frequency are that the situation of 2GHz comes into force equally such as this power for carrier frequency.
The power amplifier device that is used for communication system according to the present invention also comprises a power detection and gain factor calculation device 20.
Power detection and gain factor calculation device 20 detects the average power content of digital source signal s (n), and according to the average power content of detected digital source signal s (n), regulates the gain coefficient g of the 3rd amplifier 22
1, first power amplifier 15 and second power amplifier 16 gain coefficient g
2
The maximum average power of supposing digital source signal s (n) will reach-10dB.In this case, the measured value of the average power of digital source signal s (n) is used to regulate gain coefficient g
1And g
2Thereby the digital source signal that guarantees to enter the amplification of decomposer 10 always has-performance number of 10dB.For instance, be-32dB, the gain coefficient g of the 3rd amplifier 22 is set so if measure the average power of digital source signal
1, the digital source signal of make amplifying has-performance number of 10dB.Like this, unbalanced first and second power amplifiers will be that the signal of full power signal adds noise to being considered as.
The gain coefficient g of first power amplifier 15 and second power amplifier 16
2Be used to the average power of scale output signal x (t), thereby make it reach the setting of hope.Continue above example, gain coefficient g
2Will be set to suitable value, make that the overall gain value is a constant.
The power amplifier device that is used for communication system according to the present invention also comprises two reconstruction filters (not showing), one of them filter is connected between first digital to analog converter 11 and the modulator 13, and the another one filter is connected between second digital to analog converter 12 and the modulator 13.As long as whenever there is the conversion of digital to analogy to take place, output spectrum and every fs that will produce hope keep this frequency spectrum image of repetition.Reconstruction filter is used for filtering out the image that no longer needs.
According to the present invention, digital source signal can be multi-carrier signal or single-carrier signal.
In addition, the modulation of digital source signal s (n) can be any mode (GSM (global system for mobile communications), CDMA (code division multiple access access), OFDMA (OFDM access) etc.).
There are several approach to estimate the power of source signal.A kind of example is to check source signal itself, and estimates the power of source signal, that is to say, can calculate the s (n) for each input sample
2Absolute value, these values are averaged in the section in certain average time then.These mean value operations can utilize the alpha filter to realize, perhaps directly to N s (n)
2Absolute value summation, and then removed by N.
Another method is that to utilize some relevant signals itself be the information how to produce.For example, if known s (n) is the stack result of three signals, each has performance number X, so, can infer that the power of s (n) is 3X.This is a very actual solution in cdma system because signal s (n) in fact by a hundreds of sequence and form, and we know the power of each bar in those sequences.This method needs different signals to be sent in the power estimation module.Source signal s (n) does not need in the method.
Also exist certain methods can be used to calculate the average power of a signal in addition, the present invention simultaneously is not limited to use a kind of in the above-mentioned example.
For the calculating of gain coefficient, suppose that M is the maximum possible RMS power of source signal s (n), S is that (the RMS power of noting source signal v (n) is v (n) for the RMS power measurement values of source signal s (n)
2The root of average absolute).In this example, gain coefficient g
1Equal M/S.
Suppose as source signal g under full power state
nBe the nominal gain coefficient of two power amplifiers, in other words, if source signal is a full power signal, g
1Will be 1 and g
2Will be g
nTo produce one at output is the signal of power demand value.If source signal is not a total power, g
2Can equal S/M*g
n
Fig. 5 (a) has shown that to 5 (d) wherein digital source signal is weak power source signal according to the source signal that is used for the power amplifier device of communication system of the present invention, M signal, because the uneven out-of-band noise that produces of gain and the relation of output signal.
Shown in Fig. 5 (a) and Fig. 5 (b), under the situation of weak power source signal s (n), by the first analog signal s
1(t) and the second analog signal s
2(t) intermediate analog signal that is combined to form is increased in proportion owing to the amplification of the 3rd amplifier 22.If the 3rd Amplifier Gain coefficient g
1Set on request, the signal that enters into decomposer 10 so can keep life size always.Power amplifier can be rebuild a full scale signal always, thereby the output of the outer emission of frequency band is with relevant with input signal power.Be sent to the common gain factor g of the output signal x (t) of antenna by first and second power amplifiers 15 and 16
2Determine.
Suppose the gain coefficient g of first power amplifier 15
2Be configured to g
n, the gain coefficient of second power amplifier 16 equals g simultaneously
n, output signal x (t) will be shown in Fig. 5 (c), and the SNR value after first and second power amplifiers is still very high, and input signal is that total power is the same seemingly.Yet, according to the present invention, the gain coefficient g of first power amplifier 15 and second power amplifier 16
2Be according to g
1=M/S, g
2=g
n* the relation of S/M is provided with, thus output signal x (t) (comprising passband and noise) reduced in proportion, shown in Fig. 5 (d).
According to the present invention, digital source signal needn't be placed in the middle with zero frequency.It can be placed in the middle with intermediate frequency (so-called IF frequency).
Importantly, the present invention can and will use in wireless communication field, but it is not limited to these purposes.The present invention can be used for other transmission medium, such as carries the medium of optical signalling, perhaps carries the cable of radiofrequency signal.
Further, the present invention is applicable to all but is not limited to following modulation scheme, comprising: CDMA, OFDMA, FM, QAM, DQPSK (differential quadrature phase keying (DQPSK)), and following modulation scheme.
Further, the source signal s (n) that the present invention or go for is made up of single signal, the perhaps multi-carrier signal of forming by several carrier waves.
Further, several diverse ways can consider to be used for calculating the power of input signal, comprising or the mean value of a simple computation N sample signal, perhaps IIR is average, or the prediction of some form is filtered.The present invention is not limited to above-mentioned power calculation method.
Claims (9)
1. power amplifier device that is used for communication system comprises:
One is used for digital source signal (s (n)) is decomposed into the first digital component signal (s
1And the second digital component signal (s (n))
2(n)) decomposer (10);
One is used for the first digital component signal (s
1(n)) be converted to the first analog signal (s
1(t)) first digital to analog converter (11);
One is used for the second digital component signal (s
2(n)) be converted to the second analog signal (s
2(t)) second digital to analog converter (12);
One is used for the first analog signal (s
1(t)) amplify, obtain the first amplifying signal (x
1(t)) first power amplifier (15);
One is used for the second analog signal (s
2(t)) amplify, obtain the second amplifying signal (x
2(t)) second power amplifier (16);
One is used for the first amplifying signal (x
1And the second amplifying signal (x (t))
2(t)) combination obtains the signal synthesizer (17) of the output signal x (t) that sends out by antenna; Wherein, the power amplifier device that is used for communication system also comprises power detection and gain factor calculation device (20) and the 3rd amplifier (22), and this amplifier is used for amplifying the described digital signal (s (n)) of being decomposed by described decomposer (10);
Described power detection and gain factor calculation device (20) detect the performance number of described digital signal (s (n)), and the performance number of the detected described digital signal of foundation (s (n)), regulate the gain coefficient (g of the 3rd amplifier (22)
1) and the gain coefficient (g of first power amplifier (15) and second power amplifier (16)
2).
2. the power amplifier device that is used for communication system according to claim 1, wherein said power amplifier device also comprise a modulator (13), are used for respectively with the first analog signal (s
1And the second analog signal (s (t))
2(t)) be modulated to the carrier frequency (fc) of hope, these signals are sent to first power amplifier (15) and second power amplifier (16) respectively.
3. the power amplifier device that is used for communication system according to claim 1 and 2, wherein said power detection and gain factor calculation device (20) are regulated the gain coefficient (g of the 3rd amplifier (22)
1Thereby) make described decomposer (10) receive a full power signal.
4. the power amplifier device that is used for communication system according to claim 3, wherein said power detection and gain factor calculation device (20) are regulated the common gain coefficient (g of first power amplifier (15) and second power amplifier (16)
2), thereby make the overall gain coefficient of described power amplifier device keep constant.
5. the power amplifier device that is used for communication system according to claim 1 and 2, wherein said digital source signal (s (n)) is a multi-carrier signal.
6. the power amplifier device that is used for communication system according to claim 1 and 2, wherein said digital source signal (s (n)) is single carrier signal.
7. the power amplifier device that is used for communication system according to claim 1 and 2, the modulation of wherein said digital source signal (s (n)) is GSM, CDMA, any among the OFDMA etc.
8. the power amplifier device that is used for communication system according to claim 1 and 2, wherein said power amplifier device further comprises two reconstruction filters, one of them is connected between first digital to analog converter (11) and the modulator (13), and another one is connected between second digital to analog converter (12) and the modulator (13).
9. the power amplifier device that is used for communication system according to claim 4, the wherein gain coefficient (g of the 3rd amplifier (22)
1) and the common gain coefficient (g of first power amplifier (15) and second power amplifier (16)
2Thereby) be conditioned and make the 3rd amplifier (22) gain coefficient (g
1) equaling M/S, the common gain coefficient (g2) of first power amplifier (15) and second power amplifier (16) equals S/M*g simultaneously
n, wherein M is maximum RMS (root mean square) power of source signal (s (n)), S is the RMS power of the measurement of source signal (s (n)), g
nBe when source signal (s (n)) is total power, the nominal gain coefficient of two power amplifiers.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2003/000144 WO2004077662A1 (en) | 2003-02-25 | 2003-02-25 | Power amplifying device for communication system |
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| Publication Number | Publication Date |
|---|---|
| CN1695297A true CN1695297A (en) | 2005-11-09 |
| CN100474762C CN100474762C (en) | 2009-04-01 |
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| CNB038246678A Expired - Fee Related CN100474762C (en) | 2003-02-25 | 2003-02-25 | Power amplifying device for communication system |
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|---|---|
| CN (1) | CN100474762C (en) |
| AU (1) | AU2003213984A1 (en) |
| WO (1) | WO2004077662A1 (en) |
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|---|---|---|---|---|
| CN2364624Y (en) * | 1999-04-21 | 2000-02-16 | 王恒 | Power amplifier |
| US6462620B1 (en) * | 2000-09-12 | 2002-10-08 | Silicon Laboratories, Inc. | RF power amplifier circuitry and method for amplifying signals |
| US6445247B1 (en) * | 2001-06-01 | 2002-09-03 | Qualcomm Incorporated | Self-controlled high efficiency power amplifier |
-
2003
- 2003-02-25 WO PCT/CN2003/000144 patent/WO2004077662A1/en not_active Application Discontinuation
- 2003-02-25 AU AU2003213984A patent/AU2003213984A1/en not_active Abandoned
- 2003-02-25 CN CNB038246678A patent/CN100474762C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101136641B (en) * | 2006-07-21 | 2010-10-13 | 联发科技股份有限公司 | Multilevel transmitter to reach linear amplification with nonlinear components |
| CN102165688A (en) * | 2008-03-31 | 2011-08-24 | 新加坡科技研究局 | High efficiency linear transmitter |
| CN103219958A (en) * | 2013-04-27 | 2013-07-24 | 成都九洲电子信息系统股份有限公司 | Ultrahigh-frequency dual-band power amplifying circuit |
| CN103219958B (en) * | 2013-04-27 | 2016-11-09 | 成都九洲电子信息系统股份有限公司 | Ultrahigh-frequency dual-band power amplification circuit |
| CN104346594A (en) * | 2013-08-09 | 2015-02-11 | 航天信息股份有限公司 | Power amplification device of RFID (Radio Frequency Identification) reader-writer and signal processing method thereof |
| WO2016112483A1 (en) * | 2015-01-12 | 2016-07-21 | 华为技术有限公司 | Signal amplification processing method and apparatus |
| CN106464650A (en) * | 2015-01-12 | 2017-02-22 | 华为技术有限公司 | Signal amplification processing method and apparatus |
| US10038412B2 (en) | 2015-01-12 | 2018-07-31 | Huawei Technologies Co., Ltd. | Signal amplification processing method and apparatus |
| CN106464650B (en) * | 2015-01-12 | 2019-08-27 | 华为技术有限公司 | The method and apparatus of signal enhanced processing |
| CN106877943A (en) * | 2015-11-19 | 2017-06-20 | 德州仪器德国股份有限公司 | The accurate measurement of the transmission power calibrated using loopback in RF transceivers |
| CN106877943B (en) * | 2015-11-19 | 2021-04-13 | 德州仪器公司 | Communication transceiver using loopback calibration and calibration method of transmitting power thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2003213984A1 (en) | 2004-09-17 |
| WO2004077662A1 (en) | 2004-09-10 |
| CN100474762C (en) | 2009-04-01 |
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