CN102882478B - The compensation arrangement of power amplifier and correlation technique thereof - Google Patents
The compensation arrangement of power amplifier and correlation technique thereof Download PDFInfo
- Publication number
- CN102882478B CN102882478B CN201110199523.XA CN201110199523A CN102882478B CN 102882478 B CN102882478 B CN 102882478B CN 201110199523 A CN201110199523 A CN 201110199523A CN 102882478 B CN102882478 B CN 102882478B
- Authority
- CN
- China
- Prior art keywords
- power
- power amplifier
- distorted
- input signal
- output signal
- 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
Abstract
The present invention discloses compensation arrangement and the correlation technique thereof of power amplifier, wherein, determine that the method for the pre-distortion of power amplifier comprises: provide the first power input signal to produce the first power output signal to make power amplifier; Receive the first Received signal strength, it obtained according to the first power output signal; Utilize the predetermined gain of the first power input signal and the first Received signal strength detection power amplifier; The second power input signal is provided to produce the second power output signal to make power amplifier; Receive the second Received signal strength, it obtained according to the second power output signal; Utilize predetermined gain, the second power input signal and the second Received signal strength, determine pre-distorted ampli-tude value and the pre-distorted phase value of power amplifier.
Description
Technical field
The present invention relates to a kind of compensation arrangement and the correlation technique thereof that are applied to power amplifier, espespecially utilize the predetermined gain of power amplifier, there is a power input signal of various amplitude intensity and correspond to the Received signal strength of this power input signal, determine the pre-distorted ampli-tude value of power amplifier and the compensation arrangement of pre-distorted phase value and correlation technique thereof.
Background technology
In integrated circuit now, power amplifier has been widely used in various application circuit, such as, in a communication system.Generally speaking, power amplifier system is as a gain stage (gainstage) to be used for amplification one input signal, but in fact the linearity of power amplifier is unsatisfactory.
Please refer to Fig. 1 (including Figure 1A and Figure 1B), wherein, Figure 1A is the schematic diagram of the amplitude modulation distortion curve (AM-AMcurve) that power amplifier is described, Figure 1B is then the schematic diagram of the phase modulation distortion curve (AM-PMcurve) that power amplifier is described.As shown in Figure 1A, when power amplifier operates in linear zone (linearregion), now the amplitude gain of power amplifier is rough maintains a fixed value; And when the power of input signal continues to increase, the amplitude gain of power amplifier can decline on the contrary, this i.e. so-called amplitude modulation distortion effect.As shown in Figure 1B, when power amplifier operates in linear zone, now the phase place (that is, the phase place between the power of input signal and the power of output signal) of power amplifier is rough maintains a fixed value; And when the power of input signal continues to increase, the phase place of power amplifier then can change (decline), this i.e. so-called phase modulation distortion effect.As can be seen here, amplitude modulation distortion effect and phase modulation distortion effect system occur in power amplifier when operating in inelastic region.
But; what user can wish application circuit usually is operating as linear operation; parameters all thus all can present the relation of multiple; under if application circuit operates in inelastic region; just a lot of harmonic waves (harmonic) can be caused to occur; and and then have influence on other passage, thus, communication quality just can be caused not good.
Summary of the invention
An object of the present invention is that providing a kind of determines the method for the method of the pre-distortion of power amplifier, the linearity of compensating power amplifier and be applied to the compensation arrangement of power amplifier, to solve the problem in prior art.
Embodiments of the invention disclose a kind of compensation arrangement and the correlation technique thereof that are applied to a power amplifier.Compensation arrangement includes a power signal generator, a receiving circuit, a gain detection circuit and a predistortion determination circuit.Power signal generator provides one first power input signal with a fixed amplitude intensity to this power amplifier, and provide one second power input signal with various amplitude intensity to this power amplifier, wherein, this power amplifier can produce one first power output signal according to this first power input signal, and produces one second power output signal according to this second power input signal.Receiving circuit receives one first Received signal strength and one second Received signal strength, and wherein, this first Received signal strength obtains according to this first power output signal, and this second Received signal strength system obtains according to this second power output signal.Gain detection circuit is coupled to this power signal generator and this receiving circuit, and this gain detection circuit utilizes this fixed amplitude intensity of this first power input signal and the oscillator intensity of this first Received signal strength to detect a predetermined gain of this power amplifier.Predistortion determination circuit is coupled to this power signal generator, this receiving circuit and this gain detection circuit, this predistortion determination circuit utilizes the corresponding various amplitude intensity of the various amplitude intensity of this predetermined gain, this second power input signal and this second Received signal strength, determines multiple pre-distorted ampli-tude value of this power amplifier and multiple pre-distorted phase value.
Accompanying drawing explanation
Fig. 1 (including Figure 1A and Figure 1B) is for illustrating an amplitude modulation distortion curve of power amplifier and the schematic diagram of a phase modulation distortion curve.
Fig. 2 (including Fig. 2 A, Fig. 2 B and Fig. 2 C) is for illustrating that the present invention is applied to an amplitude compensation curve of a power amplifier and the schematic diagram of a phase compensation curve.
Fig. 3 is the calcspar that the present invention is applied to the first embodiment of the compensation arrangement of a power amplifier.
Fig. 4 is the calcspar that the present invention is applied to the second embodiment of the compensation arrangement of a power amplifier.
Fig. 5 is the schematic diagram of an example of question blank in key diagram 4.
The schematic diagram of one example of the interpolative operation result of the second pre-distorted ampli-tude value that Fig. 6 produces for the interpolation operation circuit in key diagram 4 and the second pre-distorted phase value.
Fig. 7 is how the gain detection circuit in key diagram 3 or Fig. 4 utilizes the first power input signal with this first Received signal strength to detect the schematic diagram of the predetermined gain of this power amplifier.
The signal waveforms with the second power input signal of various amplitude intensity that Fig. 8 provides for the power signal generator in key diagram 3 or Fig. 4.
Fig. 9 is the schematic diagram of an example of predistortion determination circuit in key diagram 3 or Fig. 4.
Figure 10 is the flow chart that the present invention determines an example operation of the method for the pre-distortion of a power amplifier.
Figure 11 is the flow chart that the present invention compensates an example operation of the method for the linearity of a power amplifier.
Primary clustering symbol description
110,430 pre-compensation circuit S1 ~ S6 curves
200 application circuit 120,210,750 power amplifiers
300,400 compensation arrangement 310 power signal generators
320 receiving circuit 330 gain detection circuit
340 predistortion determination circuit SIN1 first power input signal
SIN2, (Im, Qm) second power input signal
SOUT1 first power output signal SOUT2 second power output signal
SR1 first Received signal strength SR2, (Ir, Qr) second Received signal strength
G predetermined gain A
pDpre-distorted ampli-tude value
Θ
pDpre-distorted phase value A
pD' second pre-distorted ampli-tude value
Θ
pD' second pre-distorted phase value 410,50 question blank
420 interpolation operation circuit 60 interpolative operation results
700 communication system TX transmission ends
RX receiving terminal 710 digital analog converter
720 transmission end baseband circuit 730,770 frequency mixers
740,760 local oscillator 790 analog-digital converters
A, B, A1 ~ A5 amplitude T1 ~ T5 time
910 pre-set output signal generator 912 adders
920 arithmetic element Sd, (Id, Qd) pre-set output signal
1000 ~ 1020,1100 steps
Embodiment
First, simple description concept of the present invention is to contribute to understanding the technical characteristic disclosed by the present invention.Please refer to Fig. 2, Fig. 2 (including Fig. 2 A, Fig. 2 B and Fig. 2 C) is for illustrating that the present invention is applied to an amplitude compensation curve of a power amplifier and the schematic diagram of a phase compensation curve.As shown in Figure 2 A, because the linearity of in fact power amplifier 120 is unsatisfactory, therefore a pre-compensation circuit 110 (or a predistortion circuit) is arranged on the prime of power amplifier 120 by the present invention, before an input signal input SIN inputs to power amplifier 110, pre-compensation circuit 110 can use a pre-distorted ampli-tude value and a pre-distorted phase value to carry out pre-compensation input signal SIN.As shown in Figure 2 B, multiple pre-distorted ampli-tude value forms an amplitude compensation curve S 1, and because amplitude compensation curve S 1 is contrary with the amplitude modulation distortion curve S2 of power amplifier 120, therefore both can produce a net amplitude gain curve S3 after being added.As shown in Figure 2 C, multiple pre-distorted phase value forms a phase compensation curve S 4, and because phase compensation curve S 4 is contrary with the phase modulation distortion curve S5 of power amplifier 120, therefore both can produce a synthesis phase curve S 6 after being added.Can be learnt by Fig. 2, after the compensation (comprising amplitude compensation curve S 1 and phase compensation curve S 4) of pre-compensation circuit 110, net amplitude gain curve S3 and the synthesis phase curve S 6 with fixed value can be obtained, thus, the problem that power amplifier 120 can operate in inelastic region can be solved.
Please refer to Fig. 3, Fig. 3 is the calcspar that the present invention is applied to the first embodiment of the compensation arrangement 300 of a power amplifier.Generally speaking, power amplifier 210 can be applicable in an application circuit 200 (such as: a communication system), for convenience of description, omits other assembly of application circuit 200 in the present embodiment, only indicates power amplifier 210.As shown in Figure 3, compensation arrangement 300 includes (but being not limited to) power signal generator 310, receiving circuit 320, gain detection circuit 330 and predistortion determination circuit 340.First, power signal generator 310 can provide one first power input signal (such as, SIN1) to power amplifier 210, to make power amplifier 210 produce one first power output signal SOUT1 according to the first power input signal SIN1, now application circuit 200 then can obtain one first Received signal strength SR1 according to the first power output signal SOUT1; Afterwards, power signal generator 310 can provide one second power input signal SIN2 to power amplifier 210, one second power output signal SOUT2 is produced according to the second power input signal SIN2 to make power amplifier 210, now application circuit then can obtain one second Received signal strength SR2 according to the second power input signal SOUT2, wherein, the amplitude of the first power input signal SIN1 has a fixed amplitude intensity, and the amplitude of the second power input signal SIN2 has different oscillator intensities.Receiving circuit 320 then, is used for reception first Received signal strength SR1 and the second Received signal strength SR2.
Moreover, gain detection circuit 330 is coupled to power signal generator 310 and receiving circuit 320, and it utilizes the oscillator intensity of the fixed amplitude intensity of the first power input signal SIN1 and the first Received signal strength SR1 to carry out a predetermined gain G of detection power amplifier 210.It should be noted that, power amplifier 210 operates in a linear zone to produce the first power output signal SOUT1, first Received signal strength SR1 then obtains according to the first power output signal SOUT1, in other words, the predetermined gain G detected by gain detection circuit 330 is the gain that power amplifier 210 operates in linear zone.In addition, predistortion determination circuit 340 is coupled to power signal generator 310, receiving circuit 320 and gain detection circuit 330, it utilizes the various amplitude intensity of predetermined gain G, the second power input signal SIN2 and the corresponding various amplitude intensity of the second Received signal strength SR2, determines multiple pre-distorted ampli-tude value A of power amplifier 210
pDand multiple pre-distorted phase value Θ
pD.About gain detection circuit 330 and predistortion determination circuit 340 details and relevantly to operate, will be described further again in the following examples.
Please refer to Fig. 4, Fig. 4 is the calcspar that the present invention is applied to the second embodiment of the compensation arrangement 400 of a power amplifier.The framework of the compensation arrangement 400 in Fig. 4 and the compensation arrangement 300 shown in Fig. 3 similar, both differences are that compensation arrangement 400 also comprises question blank 410, interpolation operation circuit 420 and a pre-compensation circuit 430.Wherein, question blank 410 is coupled to predistortion determination circuit 340, and by multiple pre-distorted ampli-tude value A
pDand multiple pre-distorted phase value Θ
pDformed, as shown in the question blank 50 in Fig. 5.Generally speaking, the amount of capacity of question blank 410 has certain restriction, an interpolation operation circuit 420 of therefore can arranging in pairs or groups to save the space of internal memory, wherein, interpolation operation circuit 420 is coupled to question blank 410, and it utilizes an interpolation method with according to multiple pre-distorted ampli-tude value A
pDproduce (multiple) the second pre-distorted ampli-tude value A
pD', and utilize this interpolation method with according to multiple pre-distorted phase value Θ
pDproduce (multiple) the second pre-distorted phase value Θ
pD', as shown in the interpolative operation result 60 in Fig. 6.Afterwards, pre-compensation circuit 430 is arranged at the prime of power amplifier 210 and is coupled to question blank 410 and interpolation operation circuit 420, and therefore before an input signal inputs to power amplifier 210, pre-compensation circuit can with reference to multiple pre-distorted ampli-tude value A
pDand multiple pre-distorted phase value Θ
pD(or multiple second pre-distorted ampli-tude value A
pD' and multiple second pre-distorted phase value Θ
pD') and use a target pre-distorted ampli-tude value and a target pre-distorted phase value to carry out this input signal of pre-compensation.
Certainly, above-described embodiment is only used as example of the present invention and illustrates, not restrictive condition of the present invention.Know this those skilled in the art should understand, without prejudice under spirit of the present invention, the various changes of the compensation arrangement 300,400 of power amplifier are all feasible, and this also belongs to the category that the present invention is contained.
Next, further illustrate the predetermined gain of above-mentioned gain detection circuit 330 how detection power amplifier 210, and how predistortion determination circuit 340 determines multiple pre-distorted ampli-tude value A of power amplifier 210
pDwith multiple pre-distorted phase value Θ
pDrelevant running.
Please refer to Fig. 7, Fig. 7 is how the gain detection circuit 330 in key diagram 3 (or Fig. 4) utilizes the first power input signal SIN1 and the first Received signal strength SR1 to carry out the schematic diagram of the predetermined gain of detection power amplifier 210.For convenience of description, omit other assembly in compensating circuit 300 in the present embodiment, only indicate gain detection circuit 330; And the application circuit in the present embodiment is for a communication system 700, but this is not restrictive condition of the present invention.As shown in Figure 7, communication system 700 includes an a transmission end TX and receiving terminal RX usually, wherein, transmission end TX includes digital analog converter 710, transmission end baseband circuit 720, frequency mixer 730, local oscillator 740 and a power amplifier 750, and receiving terminal then includes local oscillator 760, frequency mixer 770, receiving terminal baseband circuit 780 and an analog-digital converter 790.As previously mentioned, power signal generator 310 can provide the first power input signal SIN1 to power amplifier 210, to make power amplifier 210 produce the first power output signal SOUT1 according to the first power input signal SIN1, now communication system 700 then can obtain one first Received signal strength SR1 according to the first power output signal SOUT1.Note that the amplitude of the first power input signal SIN1 has a fixed amplitude intensity A, the first therefore obtained Received signal strength SR1 also has a fixed amplitude intensity B.
As from the foregoing, gain detection circuit 330 can be expressed as following formula:
G＝P
R1－P
IN1(1)；
Wherein, G represents the predetermined gain of power amplifier 750, P
r1represent the power of the first Received signal strength SR1, and P
iN1represent the power of the first power input signal SIN1.It should be noted that, power amplifier 750 operates in a linear zone to produce the first power output signal SOUT1, first Received signal strength SR1 then obtains according to the first power output signal SOUT1, in other words, the predetermined gain G detected by gain detection circuit 330 is the gain that power amplifier 750 operates in linear zone.
Please also refer to Fig. 8 and Fig. 9, the signal waveforms with the second power input signal SIN2 of various amplitude intensity that Fig. 8 provides for the power signal generator 310 in key diagram 3 or Fig. 4, Fig. 9 is then the schematic diagram of an example of predistortion determination circuit 340 in key diagram 3 or Fig. 4.
As shown in Figure 8, the amplitude of the second power input signal SIN2 has different oscillator intensities, because the second power input signal SIN2 needs through obtaining the second Received signal strength SR2 after a while through communication system 700, therefore each oscillator intensity must continue one period of set time.For example, within time T1, the oscillator intensity of the second power input signal SIN2 is A1; Within time T2, the oscillator intensity of the second power input signal SIN2 is A2, by that analogy.Note that in one embodiment, the oscillator intensity of the amplitude of the second power input signal SIN2 can be incrementally (monotonicincrease) or degression type (monotonicdecrease), but the present invention is not limited thereto.Know this those skilled in the art should understand, without prejudice under spirit of the present invention, the various changes of the amplitude of the second power input signal SIN2 are all feasible, and this also belongs to the category that the present invention is contained.
In fig .9, for convenience of description, omit other assembly in compensating circuit 300 in the present embodiment, only indicate predistortion determination circuit 340, and the application circuit in the present embodiment is also for communication system 700.In the present embodiment, predistortion determination circuit 340 is realized by a pre-set output signal generator 910 and an arithmetic element 920.Pre-set output signal generator 910 according to predetermined gain G and the second power input signal SIN2 (in the present embodiment, also (Im can be expressed as, Qm)), obtain a pre-set output signal Sd (in the present embodiment, also can be expressed as (Id, Qd)), in the middle of this example, realize pre-set output signal generator 910 with an adder 912, therefore pre-set output signal Sd is the summation of the second power input signal SIN2 and predetermined gain G.Arithmetic element 920 is then coupled to pre-set output signal generator 910, it by pre-set output signal Sd and the second Received signal strength SR2 (in the present embodiment, also can be expressed as (Ir, Qr)) subtract each other, to obtain multiple pre-distorted ampli-tude value A of power amplifier 750
pDand multiple pre-distorted phase value Θ
pD.
Please note, above-mentioned second power input signal SIN2, the second Received signal strength SR2 and pre-set output signal Sd are respectively a complex signal, therefore the second power input signal SIN2 can be expressed as (Im, Qm), second Received signal strength SR2 is expressed as (Ir, and pre-set output signal Sd is expressed as (Id, Qd) Qr).Due to the summation that pre-set output signal Sd is the second power input signal SIN2 and predetermined gain G, therefore pre-set output signal Sd also can be represented by following formula:
Id＝Im+G(2-1)；
Qd＝Qm+G(2-2)；
That is, above-mentioned pre-set output signal Sd=(Id, Qd) also can meet following formula:
Θd＝arctan(Qd/Id)(3-2)；
In addition, above-mentioned second Received signal strength SR2=(Ir, Qr) can meet following formula:
Θr＝arctan(Qr/Ir)(4-2)；
Wherein, Pd and Θ d represents power and the phase place of pre-set output signal Sd respectively, and Pr and Θ r system represents power and the phase place of the second Received signal strength SR2 respectively.
Therefore, the pre-distorted ampli-tude value A of power amplifier
pDand pre-distorted phase value Θ
pD, can following formula be expressed as:
A
PD＝Pd－Pr(5-1)；
Θ
PD＝Θd－Θr(5-2)。
Please note, because the first power input signal SIN1, the second power input signal SIN2 are input to digital analog converter, and the first Received signal strength SR1, the second Received signal strength SR2 exported by analog-digital converter, therefore the first power input signal SIN1, the first Received signal strength SR1, the second power input signal SIN2 and the second Received signal strength SR2 are digital signal, in other words, compensation arrangement 300,400 disclosed by the present invention operates in numeric field, but this is not restrictive condition of the present invention.
In brief, the present invention first utilizes the first power input signal SIN1 with fixed amplitude intensity to carry out the predetermined gain G of detection power amplifier operations in linear zone.Then, the present invention utilizes the second power input signal SIN2 and aforesaid predetermined gain G with various amplitude intensity to determine multiple pre-distorted ampli-tude value A of power amplifier
pDand multiple pre-distorted phase value Θ
pD, wherein, multiple pre-distorted ampli-tude value forms an amplitude compensation curve (S1 as in Fig. 2 B), and multiple pre-distorted phase value then forms a phase compensation curve (S4 as in Fig. 2 C).In addition, multiple pre-distorted ampli-tude value A can be utilized
pDand multiple pre-distorted phase value Θ
pDform a question blank, or utilize interpolation method with according to multiple pre-distorted ampli-tude value A further
pDproduce (multiple) the second pre-distorted ampli-tude value A
pD', and utilize this interpolation method with according to multiple pre-distorted phase value Θ
pDproduce (multiple) the second pre-distorted phase value Θ
pD'.Finally, the pre-compensation circuit (or a predistortion circuit) that aforementioned manner obtains by the present invention is arranged on the prime of power amplifier, therefore, before an input signal inputs to power amplifier, this pre-compensation circuit can with reference to multiple pre-distorted ampli-tude value A
pDand multiple pre-distorted phase value Θ
pD(or multiple second pre-distorted ampli-tude value A
pD' and multiple second pre-distorted phase value Θ
pD') and use a target pre-distorted ampli-tude value and a target pre-distorted phase value to carry out this input signal of pre-compensation.Amplitude compensation curve S 1 disclosed by the present invention is contrary with the amplitude modulation distortion curve S2 of power amplifier, and phase compensation curve S 4 disclosed by the present invention is contrary with the phase modulation distortion curve S5 of power amplifier, the net amplitude gain curve S3 therefore produced after being added and synthesis phase curve S 6 have fixed value.Thus, the problem that power amplifier can operate in inelastic region can be solved.
Please refer to Figure 10, Figure 10 is the flow chart that the present invention determines an example operation of the method for the pre-distortion of a power amplifier, it comprises (but being not limited to), and step below (please notes, if can obtain result identical in fact, then these steps might not perform in accordance with the execution order shown in Figure 10):
Step 1000: start.
Step 1002: provide the first power input signal, to make power amplifier produce the first power output signal, wherein, the amplitude of the first power input signal has a fixed amplitude intensity.
Step 1004: receive the first Received signal strength, it obtained according to the first power output signal.
Step 1006: utilize the fixed amplitude intensity of the first power input signal and the oscillator intensity of the first Received signal strength to carry out a predetermined gain of detection power amplifier.
Step 1012: provide the second power input signal, to make power amplifier produce the second power output signal, wherein, the amplitude of the second power input signal has various amplitude intensity.
Step 1014: receive the second Received signal strength, it obtained according to the second power output signal.
Step 1020: the corresponding various amplitude intensity utilizing the various amplitude intensity of predetermined gain, the second power input signal and the second Received signal strength, determines multiple pre-distorted ampli-tude value of power amplifier and multiple pre-distorted phase value.
The each assembly shown in each step shown in Figure 10 and Fig. 3 of please arranging in pairs or groups can be understood each assembly and how to operate, and for for purpose of brevity, therefore repeats no more in this.Wherein, step 1002,1012 is performed by power signal generator 310 and power amplifier 210, step 1004,1014 is performed by receiving circuit 320, and step 1006 is performed by gain detection circuit 330, and step 1020 is performed by predistortion determination circuit 340.
Please refer to Figure 11, Figure 11 is the flow chart that the present invention compensates an example operation of the method for the linearity of a power amplifier, step below that it comprises (but being not limited to):
Step 1000: start.
Step 1002: provide the first power input signal, to make power amplifier produce the first power output signal, wherein, the amplitude of the first power input signal has a fixed amplitude intensity.
Step 1004: receive the first Received signal strength, it obtained according to the first power output signal.
Step 1006: utilize the fixed amplitude intensity of the first power input signal and the oscillator intensity of the first Received signal strength to carry out a predetermined gain of detection power amplifier.
Step 1012: provide the second power input signal, to make power amplifier produce the second power output signal, wherein, the amplitude of the second power input signal has various amplitude intensity.
Step 1014: receive the second Received signal strength, it obtained according to the second power output signal.
Step 1020: the various amplitude intensity utilizing the various amplitude intensity of predetermined gain, the second power input signal and the corresponding of the second Received signal strength, determines multiple pre-distorted ampli-tude value of power amplifier and multiple pre-distorted phase value.
Step 1100: before an input signal inputs to this power amplifier, uses a target pre-distorted ampli-tude value and a target pre-distorted phase value to carry out this input signal of pre-compensation with reference to the plurality of pre-distorted ampli-tude value and the plurality of pre-distorted phase value.
The each assembly shown in each step shown in Figure 11 and Fig. 4 of please arranging in pairs or groups can be understood each assembly and how to operate, it should be noted that the process step system in Figure 11 and the process step in Figure 10 similar, both differences be to also add in Figure 11 a pre-compensation step (that is, step 1100), can be performed by the pre-compensation circuit 430 in Fig. 4.
Please note, the step of above-mentioned each flow process be only the present invention for feasible embodiment, and unrestricted restrictive condition of the present invention, and when without prejudice to spirit of the present invention, these methods also can comprise the step of other centre, and those skilled in the art is when doing suitable change according to this.
Above-described embodiment is only used for technical characteristic of the present invention is described, is not used for limiting to category of the present invention.As from the foregoing, the invention provides a kind of compensation arrangement and the correlation technique thereof that are applied to power amplifier.First, through utilizing the first power input signal SIN1 with fixed amplitude intensity, can detect that power amplifier operates in the predetermined gain G of linear zone.Then, by utilizing, there is the second power input signal SIN2 of various amplitude intensity and detected predetermined gain G, multiple pre-distorted ampli-tude value A of power amplifier can be obtained
pDand multiple pre-distorted phase value Θ
pD.In this, an amplitude compensation curve can be formed by multiple pre-distorted ampli-tude value, and form a phase compensation curve by multiple pre-distorted phase value.Wherein, multiple pre-distorted ampli-tude value A
pDand multiple pre-distorted phase value Θ
pDa question blank can be formed, or interpolation method can be utilized with according to multiple pre-distorted ampli-tude value A
pD/ pre-distorted phase value Θ
pDproduce (multiple) the second pre-distorted ampli-tude value A
pD'/second pre-distorted phase value Θ
pD'.Therefore, before an input signal inputs to power amplifier, the pre-compensation circuit disclosed by the present invention can with reference to multiple pre-distorted ampli-tude value A
pDand multiple pre-distorted phase value Θ
pD(or multiple second pre-distorted ampli-tude value A
pD' and multiple second pre-distorted phase value Θ
pD') carry out this input signal of pre-compensation.Thus, the problem that power amplifier can operate in inelastic region can be solved, to avoid the appearance of harmonic wave, and and then promote communication quality.In addition, the mechanism disclosed by the present invention is operable in numeric field, and its implementation framework is more simple.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (15)
1. be applied to a compensation arrangement of a power amplifier, described compensation arrangement includes:
One power signal generator, there is provided one first power input signal with a fixed amplitude intensity to described power amplifier, and provide one second power input signal with various amplitude intensity to described power amplifier, wherein, described power amplifier produces one first power output signal according to described first power input signal, and produces one second power output signal according to described second power input signal;
One receiving circuit, receives one first Received signal strength and one second Received signal strength, and wherein, described first Received signal strength corresponds to described first power output signal, and described second Received signal strength corresponds to described second power output signal;
One gain detection circuit, be coupled to described power signal generator and described receiving circuit, utilize the described fixed amplitude intensity of described first power input signal and the oscillator intensity of described first Received signal strength to detect a predetermined gain of described power amplifier; And
One predistortion (pre-distortion) determines circuit, be coupled to described power signal generator, described receiving circuit and described gain detection circuit, described predistortion determination circuit utilizes the various amplitude intensity of described predetermined gain, described second power input signal and the corresponding various amplitude intensity of described second Received signal strength, determines multiple pre-distorted ampli-tude value of described power amplifier and multiple pre-distorted phase value.
2. compensation arrangement according to claim 1, wherein, described power amplifier operates in a linear zone to produce described first power output signal.
3. compensation arrangement according to claim 1, also comprises:
One question blank, is coupled to described predistortion determination circuit, is made up of described multiple pre-distorted ampli-tude value and described multiple pre-distorted phase value.
4. compensation arrangement according to claim 3, also comprises:
One interpolation operation circuit, be coupled to described question blank, described interpolation operation circuit utilizes an interpolation method to come to produce one second pre-distorted ampli-tude value according to described multiple pre-distorted ampli-tude value, and utilizes described interpolation method to come to produce one second pre-distorted phase value according to described multiple pre-distorted phase value.
5. compensation arrangement according to claim 3, also includes:
One pre-compensation circuit, be arranged on the prime of described power amplifier and be coupled to described question blank, before an input signal inputs to described power amplifier, described pre-compensation circuit uses a target pre-distorted ampli-tude value and a target pre-distorted phase value to carry out input signal described in pre-compensation with reference to described multiple pre-distorted ampli-tude value and described multiple pre-distorted phase value.
6. compensation arrangement according to claim 1, wherein, described multiple pre-distorted ampli-tude value forms an amplitude compensation curve, and described multiple pre-distorted phase value forms a phase compensation curve; And described amplitude compensation curve is contrary with an amplitude modulation distortion curve of described power amplifier, and described phase compensation curve is contrary with a phase modulation distortion curve of described power amplifier.
7. compensation arrangement according to claim 1, wherein, the oscillator intensity of the amplitude of described second power input signal is for increasing progressively or successively decreasing.
8. compensation arrangement according to claim 1, wherein, described gain detection circuit can be expressed as following formula:
G＝P
R1－P
IN1；
Wherein, G represents the described predetermined gain of described power amplifier, P
r1represent the power of described first Received signal strength, and P
iN1represent the power of described first power input signal.
9. compensation arrangement according to claim 1, wherein, described predistortion determination circuit comprises:
One pre-set output signal generator, is used for according to described predetermined gain and described second power input signal, obtains a pre-set output signal, and wherein, described pre-set output signal is the summation of described second power input signal and described predetermined gain; And
One arithmetic element, subtracts each other described pre-set output signal and described second Received signal strength, to obtain described multiple pre-distorted ampli-tude value of described power amplifier and described multiple pre-distorted phase value.
10. compensation arrangement according to claim 9, wherein, described second power input signal, described second Received signal strength and described pre-set output signal are respectively a complex signal; Described second power input signal is expressed as (Im, Qm), and described second Received signal strength is expressed as (Ir, Qr), and described pre-set output signal is expressed as (Id, Qd); And Id=Im+G, Qd=Qm+G, and G represents the described predetermined gain of described power amplifier.
11. compensation arrangements according to claim 10, wherein:
Described pre-set output signal (Id, Qd) meets following formula:
Θd＝arctan(Q
d/I
d)；
Described second Received signal strength (Ir, Qr) meets following formula:
Θr＝arctan(Qr/Ir)；
Pd and Θ d represents power and the phase place of described pre-set output signal respectively, Pr and Θ r represents power and the phase place of described second Received signal strength respectively;
The described pre-distorted ampli-tude value A of described power amplifier
pDand described pre-distorted phase value Θ
pD, can following formula be expressed as:
A
pD=Pd-Pr; And
Θ
PD＝Θd－Θr。
12. 1 kinds of methods determining the pre-distortion of a power amplifier, include:
There is provided one first power input signal, to make described power amplifier produce one first power output signal, wherein, the amplitude of described first power input signal has a fixed amplitude intensity;
Receive one first Received signal strength, wherein, described first Received signal strength obtained according to described first power output signal;
Utilize the described fixed amplitude intensity of described first power input signal and the oscillator intensity of described first Received signal strength to detect a predetermined gain of described power amplifier;
There is provided one second power input signal, to make described power amplifier produce one second power output signal, wherein, the amplitude of described second power input signal has various amplitude intensity;
Receive one second Received signal strength, wherein, described second Received signal strength obtained according to described second power output signal; And
Utilize the various amplitude intensity of described predetermined gain, described second power input signal and the corresponding various amplitude intensity of described second Received signal strength, determine multiple pre-distorted ampli-tude value of described power amplifier and multiple pre-distorted phase value.
13. methods according to claim 12, wherein, described power amplifier operates in a linear zone to produce described first power output signal.
14. methods according to claim 12, wherein, described multiple pre-distorted ampli-tude value forms an amplitude compensation curve, and described multiple pre-distorted phase value forms a phase compensation curve; And described amplitude compensation curve is contrary with an amplitude modulation distortion curve of described power amplifier, and described phase compensation curve is contrary with a phase modulation distortion curve of described power amplifier.
15. methods according to claim 12, wherein, utilize described predetermined gain, described second power input signal and described second Received signal strength, determine that described multiple pre-distorted ampli-tude value of described power amplifier and the step of described multiple pre-distorted phase value include:
According to described predetermined gain and described second power input signal, obtain a pre-set output signal, wherein, described pre-set output signal is the summation of described second power input signal and described predetermined gain; And
According to the oscillator intensity of described pre-set output signal and the oscillator intensity of described second Received signal strength, determine described multiple pre-distorted ampli-tude value of described power amplifier and described multiple pre-distorted phase value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110199523.XA CN102882478B (en) | 2011-07-15 | 2011-07-15 | The compensation arrangement of power amplifier and correlation technique thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110199523.XA CN102882478B (en) | 2011-07-15 | 2011-07-15 | The compensation arrangement of power amplifier and correlation technique thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102882478A CN102882478A (en) | 2013-01-16 |
| CN102882478B true CN102882478B (en) | 2016-03-16 |
Family
ID=47483677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110199523.XA Active CN102882478B (en) | 2011-07-15 | 2011-07-15 | The compensation arrangement of power amplifier and correlation technique thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102882478B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI508463B (en) | 2013-04-16 | 2015-11-11 | Realtek Semiconductor Corp | Wireless transmission system, and method for determining default gain thereof |
| CN104113382B (en) * | 2013-04-22 | 2016-08-03 | 瑞昱半导体股份有限公司 | Wireless transmitting system and determine the method for preset gain of wireless transmitting system |
| CN104124928B (en) * | 2013-04-26 | 2017-08-01 | 瑞昱半导体股份有限公司 | Automatic gain adjustment device and its method |
| CN111200568B (en) * | 2018-11-16 | 2021-05-18 | 华为技术有限公司 | Transmitting end device and signal processing method |
| CN115250124B (en) * | 2021-04-26 | 2024-01-19 | 瑞昱半导体股份有限公司 | Transceiver circuit and transmission power offset compensation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1011192A2 (en) * | 1998-12-10 | 2000-06-21 | Nortel Networks Corporation | A linear amplifier arrangement |
| CN1384996A (en) * | 1999-10-26 | 2002-12-11 | 艾利森电话股份有限公司 | Adaptive linearization of power amplifiers |
| US6680648B2 (en) * | 2002-03-08 | 2004-01-20 | The Aerospace Corporation | High power amplifier predistorter system |
| CN1475043A (en) * | 2000-09-19 | 2004-02-11 | 科学技术振兴事业团 | Nonlinear distortion compensation power amplifier |
-
2011
- 2011-07-15 CN CN201110199523.XA patent/CN102882478B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1011192A2 (en) * | 1998-12-10 | 2000-06-21 | Nortel Networks Corporation | A linear amplifier arrangement |
| CN1384996A (en) * | 1999-10-26 | 2002-12-11 | 艾利森电话股份有限公司 | Adaptive linearization of power amplifiers |
| CN1475043A (en) * | 2000-09-19 | 2004-02-11 | 科学技术振兴事业团 | Nonlinear distortion compensation power amplifier |
| US6680648B2 (en) * | 2002-03-08 | 2004-01-20 | The Aerospace Corporation | High power amplifier predistorter system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102882478A (en) | 2013-01-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI407686B (en) | Compensation device applied to power amplifier, method for determining pre-distortion of power amplifier, and method for compensating linearity of power amplifier thereof | |
| CN1601892B (en) | Distortion-compensated amplifier using predistortion technique | |
| CN102882478B (en) | The compensation arrangement of power amplifier and correlation technique thereof | |
| US8824980B2 (en) | System and method to implement a radio transmitter with digital predistortion having reduced noise | |
| US8619916B2 (en) | Apparatus for receiving signal and method of compensating phase mismatch thereof | |
| CN104618283A (en) | Communication device and method of multipath compensation for digital predistortion linearization | |
| US20140086361A1 (en) | Processor having instruction set with user-defined non-linear functions for digital pre-distortion (dpd) and other non-linear applications | |
| JP4619827B2 (en) | Distortion compensation device | |
| US10075324B2 (en) | Predistortion processing apparatus and method | |
| US20130178175A1 (en) | Voltage standing wave ratio detection circuit | |
| US20200067466A1 (en) | Wireless Architectures and Digital Pre-Distortion (DPD) Techniques Using Closed Loop Feedback for Phased Array Transmitters | |
| JP2015002538A (en) | Amplification device | |
| US8831550B2 (en) | Method of compensating signal imbalance of wireless communication system | |
| US20210314009A1 (en) | Mitigation of intermodulation distortion | |
| CN107919857B (en) | Predistortion system and method | |
| CN105812031A (en) | Electronic equipment and control method therefor | |
| CN101710887A (en) | Method and system for processing digital predistortion | |
| Yao et al. | An accurate three-input nonlinear model for joint compensation of frequency-dependent I/Q imbalance and power amplifier distortion | |
| Fan et al. | Joint IQ imbalance and PA nonlinearity pre-distortion for highly integrated millimeter-wave transmitters | |
| US10122391B2 (en) | Radio frequency systems and methods for polar phase distortion calibration | |
| JP4939281B2 (en) | Amplifier | |
| JP5406132B2 (en) | Peak factor reduction device and radio transmitter | |
| Fu et al. | Digital pre-distortion of power amplifier impairments in spectrally agile transmissions | |
| CN104717164B (en) | Signal bearing calibration and means for correcting | |
| JP2017118300A (en) | Frequency characteristic correction circuit |
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 |