CN100488031C - Method for improving efficiency of power amplifier - Google Patents
Method for improving efficiency of power amplifier Download PDFInfo
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- CN100488031C CN100488031C CNB2005100020561A CN200510002056A CN100488031C CN 100488031 C CN100488031 C CN 100488031C CN B2005100020561 A CNB2005100020561 A CN B2005100020561A CN 200510002056 A CN200510002056 A CN 200510002056A CN 100488031 C CN100488031 C CN 100488031C
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Abstract
The invention relates to a method for improving the efficiency of power amplifier. The method comprises: dividing the working range of N-chain circuit power amplifier into the working sections more than N; setting the relationships between each working section, input signal power and the working state of power amplifier; according to preset input signal power, setting the working section of present input signal to trigger the relative working state; and the power amplifier amplifies and outputs the signal. The invention can make the working states of power amplifier more flexible, improve the efficiency, reliability, and confirm the linearity.
Description
Technical field
The present invention relates to the power amplification circuit field, particularly a kind of method that improves efficiency power amplifier.
Background technology
In radio communication, power amplifier is called for short power amplifier, is a very important part.No matter be in base transceiver station (BTS) or wireless mobile apparatus, the efficiency of power amplifier is the focus that people pay close attention to all the time.Multiple efficient enhancement techniques is arranged at present, and Du Heti (Doherty) technology is wherein very representational a kind of.
Traditional Doherty power amplifier as shown in Figure 1.Traditional Doherty power amplifier contains two identical power amplifiers: carrier power amplifier and peak value power amplifier are connected with 1/4 wavelength offset transmission line between them.Carrier power amplifier also is main power amplifier, and operated by rotary motion is in Class B; The peak value power amplifier also is auxiliary power amplifier, and operated by rotary motion is at Class C.Press the size of input signal power and divide, traditional Doherty power amplifier has two kinds of operating states: when input signal power is less than or equal to a half of Doherty power amplifier peak power, have only carrier power amplifier in work; When input signal power surpasses Doherty power amplifier peak power one half, two power amplifiers are all worked.
When the small-power input signal, the peak value power amplifier keeps closing, and is equivalent to short circuit; The carrier power amplifier operate as normal is equivalent to a Class B power amplifier.Efficient increases and increases gradually along with output, when carrier power amplifier reaches capacity, reaches the efficient of desirable Class B power amplifier.
When input signal increases gradually, surpass a half of Doherty power amplifier peak power, its peak work is decontroled and is opened.The electric current that is produced by the peak value power amplifier is by load, and the load when therefore the L point is seen at this moment duty ratio small-signal in Fig. 1 has increase.The effect of λ/4 offset transmission lines is the loads that reduce carrier power amplifier.Carrier power amplifier remains on saturation condition, is equivalent to a voltage source.It is operated in efficiency peak, and the power that it provided increases gradually.When input signal power reached the peak power of Doherty power amplifier, the load of two power amplifiers was identical, bore half of system's peak power output separately.This moment, desirable efficient was equivalent to the efficient of Class B power amplifier.
In the Doherty of prior art power amplifier, carrier power amplifier can be the same with the peak value power amplifier, also can be different.Generally speaking, carrier power amplifier is operated in Class A or class AB, and its peak work is put and is operated in Class B or Class C.Have only carrier power amplifier work when small-signal, its peak work is decontroled beginning work when carrier power amplifier reaches capacity, and improves the operating efficiency of power amplifier like this.
But in traditional Doherty power amplifier technology, the working region of peak value power amplifier and carrier power amplifier is established extremely, and is not too flexible.When the small-power input signal, carrier power amplifier operate as normal and the peak value power amplifier is closed, in case the carrier power amplifier chain rupture is not opened because its peak work is released, the output of whole system will chain rupture.And the opening point of peak value power amplifier is difficult to hold: open too late, produce clipping distortion owing to the saturated of carrier power amplifier or by meeting so, the linearity of power amplifier is difficult to guarantee; Open too early, can make the efficient of power amplifier be affected owing to the consumption of peak value power amplifier.
Summary of the invention
In view of this, the present invention has proposed a kind of method that improves efficiency power amplifier in order to overcome above-mentioned shortcoming, and its purpose is further to improve the efficient of power amplifier, and guarantees the linearity of power amplifier.
According to above-mentioned purpose, the invention provides a kind of method that improves efficiency power amplifier, this method is as follows: the input signal power scope division of power amplifier that will comprise the power amplifier tube of N road concurrent working is the operation interval more than N; By each power amplifier tube bias control circuit separately is set, the input signal power value of each operation interval correspondence and the operating state of power amplifier are set, when making the signal input, described power amplifier is operated in the operating state corresponding with the current input signal performance number according to the setting of input signal power and described bias control circuit, and wherein N is the integer greater than 1.
Described power amplifier is two link power amplifiers, and described two links are link 1 and link 2, and wherein, the saturation power of link 1 power amplifier tube is less than the saturation power of link 2 power amplifier tubes, and this method comprises:
A0. the working range with two link power amplifiers is divided into three operation intervals: between first operation interval, secondary service area, the 3rd operation interval;
A1., the input signal power Pin that the first operation interval correspondence is set is the boundary threshold value Pin1 less than corresponding input signal power scope between described first operation interval and secondary service area, the operating state of power amplifier is: link 1 is operated in normal condition, and link 2 is in off state;
A2., corresponding input signal power Pin is set between the secondary service area for more than or equal to Pin1 and less than between described secondary service area and the boundary threshold value Pin2 of the corresponding input signal power scope of the 3rd operation interval, the operating state of power amplifier is: link 1 is in off state, and link 2 is operated in normal condition;
A3., the input signal power Pin that the 3rd operation interval correspondence is set is for more than or equal to Pin2 and less than the threshold value Pin3 of the corresponding input signal power scope of described the 3rd operation interval, the operating state of power amplifier is: link 1 and link 2 all are operated in normal condition.
Further, described steps A 2 is: corresponding input signal power Pin is set between the secondary service area for more than or equal to Pin1 and less than between described secondary service area and the boundary threshold value Pin2 of the corresponding input signal power scope of the 3rd operation interval, the operating state of power amplifier is: link 1 and link 2 all are operated in normal condition; Described steps A 3 is: the input signal power Pin that the 3rd operation interval correspondence is set is for more than or equal to Pin2 and less than the threshold value Pin3 of the corresponding input signal power scope of described the 3rd operation interval, the operating state of power amplifier is: link 1 is in off state, and link 2 is operated in normal condition.
Further, described power amplifier is two link power amplifiers, and described two links are link 1 and link 2, and wherein, the saturation power of link 1 power amplifier tube is less than the saturation power of link 2 power amplifier tubes, and this method comprises:
A0. the working range with two link power amplifiers is divided into three operation intervals: first operation interval, comprise between the secondary service area in first subinterval and second subinterval, the 3rd operation interval;
A1., the input signal power Pin that the first operation interval correspondence is set is the threshold value Pin1 less than the corresponding input signal power scope in first subinterval, and the operating state of power amplifier is: link 1 is operated in normal condition, and link 2 is in off state;
A21, the first subinterval correspondence is set input signal power Pin for more than or equal to Pin1 and less than the boundary threshold value Pin12 of the corresponding input signal power scope in described first subinterval and described second subinterval, the operating state of power amplifier is: link 1 and link 2 all are operated in normal condition;
A22, the second subinterval correspondence is set input signal power Pin for more than or equal to Pin12 and less than the threshold value Pin2 of the corresponding input signal power scope in second subinterval, the operating state of power amplifier is: link 1 is in off state, and link 2 is operated in normal condition;
A3., the input signal power Pin that the 3rd operation interval correspondence is set is for more than or equal to Pin2 and less than the threshold value Pin3 of the corresponding input signal power scope of described the 3rd operation interval, the operating state of power amplifier is: link 1 is in off state, and link 2 is operated in normal condition.
Preferably, Pin3-Pin2=Pin2-Pin1=Pin1 is set.
Preferably, Pin3-Pin2=Pin2-Pin12=Pin12-Pin1=Pin1 is set.
Preferably, the saturation power value that Pin1 equals link 1 power amplifier tube is set.
Preferably, the saturation power value that Pin2 equals link 2 power amplifier tubes is set.
Described N link power amplifier is three link Doherty power amplifiers, described three links are link 1, link 2 and link 3, wherein, the saturation power minimum of link 1 power amplifier tube, the saturation power maximum of link 3 power amplifier tubes, the saturation power sum of the power amplifier tube of link 1 and link 2 is more than or equal to the saturation power of the power amplifier tube of link 3, and this method comprises: three link power amplifiers are divided into seven operation intervals: first operation interval, between the secondary service area, the 3rd operation interval, the 4th operation interval, the 5th operation interval, the 6th operation interval, the 7th operation interval; The input signal power Pin that the first operation interval correspondence is set is the boundary threshold value Pin1 less than corresponding input signal power scope between described first operation interval and secondary service area, the operating state of power amplifier is: link 1 is operated in normal condition, and link 2 and link 3 turn-off; Corresponding input signal power Pin is set between the secondary service area for more than or equal to Pin1 and less than between described secondary service area and the boundary threshold value Pin2 of the corresponding input signal power scope of the 3rd operation interval, the operating state of power amplifier is: link 2 is operated in normal condition, and link 1 and link 3 turn-off; The input signal power Pin that the 3rd operation interval correspondence is set is for more than or equal to Pin2 and less than the boundary threshold value Pin3 of described the 3rd operation interval and the corresponding input signal power scope of the 4th operation interval, the operating state of power amplifier is: link 3 is operated in normal condition, and link 1 and link 2 turn-off; The input signal power Pin that the 4th operation interval correspondence is set is for more than or equal to Pin3 and less than the boundary threshold value Pin4 of described the 4th operation interval and the corresponding input signal power scope of the 5th operation interval, the operating state of power amplifier is: link 1 and link 2 are operated in normal condition, and link 3 turn-offs; The input signal power Pin that the 5th operation interval correspondence is set is for more than or equal to Pin4 and less than the boundary threshold value Pin5 of described the 5th operation interval and the corresponding input signal power scope of the 6th operation interval, the operating state of power amplifier is: link 1 and link 3 are operated in normal condition, and link 2 turn-offs; The input signal power Pin that the 6th operation interval correspondence is set is for more than or equal to Pin5 and less than the boundary threshold value Pin6 of described the 6th operation interval and the corresponding input signal power scope of the 7th operation interval, the operating state of power amplifier is: link 2 and link 3 are operated in normal condition, and link 1 turn-offs; The input signal power Pin that the 7th operation interval correspondence is set is Pin more than or equal to Pin6 and less than the boundary threshold value Pin7 of described the 7th operation interval and the corresponding input signal power scope of the 8th operation interval, the operating state of power amplifier is: link 1, link 2 and link 3 are operated in normal condition.
Described N link power amplifier is three link Doherty power amplifiers, described three links are link 1, link 2 and link 3, wherein, the saturation power minimum of link 1 power amplifier tube, the saturation power maximum of link 3 power amplifier tubes, the saturation power sum of the power amplifier tube of link 1 and link 2 is smaller or equal to the saturation power of the power amplifier tube of link 3, and this method comprises: three link power amplifiers are divided into seven operation intervals: first operation interval, between the secondary service area, the 3rd operation interval, the 4th operation interval, the 5th operation interval, the 6th operation interval, the 7th operation interval; The input signal power Pin that the first operation interval correspondence is set is that the operating state of power amplifier is: link 1 is operated in normal condition less than Pin1, and link 2 and link 3 turn-off; Corresponding input signal power Pin is set between the secondary service area for more than or equal to the boundary threshold value Pin1 of corresponding input signal power scope between described first operation interval and secondary service area and less than between described secondary service area and the boundary threshold value Pin2 of the corresponding input signal power scope of the 3rd operation interval, the operating state of power amplifier is: link 2 is operated in normal condition, and link 1 and link 3 turn-off; The input signal power Pin that the 3rd operation interval correspondence is set is for more than or equal to Pin2 and less than the boundary threshold value Pin3 of described the 3rd operation interval and the corresponding input signal power scope of the 4th operation interval, the operating state of power amplifier is: link 1 and link 2 are operated in normal condition, and link 3 turn-offs; The input signal power Pin that the 4th operation interval correspondence is set is for more than or equal to Pin3 and less than the boundary threshold value Pin4 of described the 4th operation interval and the corresponding input signal power scope of the 5th operation interval, the operating state of power amplifier is: link 3 is operated in normal condition, and link 1 and link 2 turn-off; The input signal power Pin that the 5th operation interval correspondence is set is for more than or equal to Pin4 and less than the boundary threshold value Pin5 of described the 5th operation interval and the corresponding input signal power scope of the 6th operation interval, the operating state of power amplifier is: link 1 and link 3 are operated in normal condition, and link 2 turn-offs; The input signal power Pin that the 6th operation interval correspondence is set is for more than or equal to Pin5 and less than the boundary threshold value Pin6 of described the 6th operation interval and the corresponding input signal power scope of the 7th operation interval, the operating state of power amplifier is: link 2 and link 3 are operated in normal condition, and link 1 turn-offs; The input signal power Pin that the 7th operation interval correspondence is set is Pin more than or equal to Pin6 and less than the boundary threshold value Pin7 of described the 7th operation interval and the corresponding input signal power scope of the 8th operation interval, the operating state of power amplifier is: link 1, link 2 and link 3 are operated in normal condition.
From such scheme as can be seen, since the present invention with N link power amplifier working range be divided into operation interval more than N, and the input signal power value corresponding with each operation interval and the power amplifier operating state at each operation interval is set, make power amplifier according to the chores of input signal power in proper state, thereby improved the efficient of power amplifier on the whole, and strengthened the reliability of power amplifier, guaranteed the linearity of power amplifier.
Description of drawings
Fig. 1 is the schematic diagram of traditional Doherty power amplifier;
Fig. 2 is according to implementation process schematic diagram of the present invention;
Fig. 3 is used in schematic diagram in the Doherty power amplifier for the present invention;
Fig. 4 is the schematic diagram of transoid Doherty power amplifier;
Fig. 5 is a Balun power amplifier schematic diagram;
Fig. 6 is N (N〉a 2) link Doherty power amplifier schematic diagram.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in more detail by the following examples.
As shown in Figure 2, implementation process of the present invention is as follows:
The working range of N link power amplifier is divided into the individual operation interval more than N; The corresponding relation of each operation interval and input signal power value and power amplifier operating state is set.
According to the current input signal performance number, determine the pairing operation interval of current input signal, trigger the operating state that power amplifier is operated in described corresponding operation interval.
Power amplifier amplifying signal and output.
Be that example describes with two link Doherty power amplifiers below.As shown in Figure 3, two power amplification links are arranged among the figure, and power amplifier tube (PA1 and the PA2) saturation power in two links varies in size, is without loss of generality, we suppose that PA1 is the less power amplifier tube of saturation power, and PA2 is the bigger power amplifier tube of saturation power.
At first the working range of two link power amplifiers is divided into operation interval more than 2; The corresponding relation of each operation interval and input signal power value and power amplifier operating state is set.
The present invention distinguishes the operation interval of power amplifier according to the size of input signal power and triggers the operating state of two power amplification links.The size of input signal can be known from base band or radio frequency detection with detection device at an easy rate.Two link Doherty power amplifiers have three kinds of operating states:
State 1, link 1 are operated in normal condition, and link 2 is in off state;
State 2, link 2 are operated in normal condition, and link 1 is in off state;
State 3, link 1 and link 2 all are operated in normal condition.
The present invention tentatively is divided into three operation intervals with the working range of two link power amplifiers, and the scope that the input signal power Pin corresponding with them be set is: Pin＜Pin1; Pin1≤Pin＜Pin2; Pin2≤Pin＜Pin3.And be arranged on the operating state of power amplifier in these three operation intervals, step is as follows:
A1. be provided with when Pin＜Pin1, power amplifier is operated in state 1.Be input signal among a small circle the time, in the power amplifier, PA1 opens, and be operated under the normal condition, and PA2 is in off state.The above-mentioned setting mainly by the realization that is provided with to the power amplifier offset control circuit, for example by the bias control circuit of PA1 is set, make PA1 just start working during less than Pin1 at input signal power, by the bias control circuit of PA2 is set, the opening point of PA2 fixed on Pin1 or more than the Pin1, when Pin＜Pin1, PA2 just is in off state so.Concrete method to set up in the following step is identical therewith.
PA2 is usually operated at Class B or Class C in design, and this moment, its quiescent current was 0, therefore can think that it is to be in off state.Because this moment, PA2 did not consume quiescent current, and PA1 is a less power tube, its quiescent current is also less than the electric current of carrier power amplifier in traditional Doherty power amplifier, therefore under such small-signal input efficient of the present invention than the efficient height of traditional Doherty power amplifier.
A2. be provided with when Pin1≤Pin＜Pin2, power amplifier is operated in state 2.Have only a link this moment in work, and the main energy dissipation device PA2 in the link is operated in its large-signal scope, so its efficient is than higher.At this moment whole power amplifier is equivalent to a transoid Doherty power amplifier.Transoid Doherty is on traditional Doherty basis, and with carrier power amplifier and peak value power amplifier switch, as shown in Figure 4, this technology is open in the U.S. patent documents that one piece of patent No. is US6262629B.
A3. be provided with when Pin2≤Pin＜Pin3, power amplifier is operated in state 3.Promptly under the large-signal initial conditions, PA1 and PA2 are operated in normal condition, and owing to two power amplifiers all are operated under the large-scale condition, so their efficient is also than higher.
The division of input signal power scope among the present invention, can be five equilibrium, i.e. Pin3-Pin2=Pin2-Pin1=Pin1 also can be a five equilibrium not, promptly divide arbitrarily the input signal power scope, as long as satisfy within the saturation power that the power amplifier link is operated in it.Pin1 can also be made as the saturation value of low power tube PA1, Pin2 is made as the saturation value of high power valve PA2.
The invention provides implementation more flexibly.In setting up procedure, if Pin3 is not more than the saturation value than high power valve PA2, the operating state of steps A 2 and A3 intermediate power amplifier can be exchanged, and then above-mentioned steps A2, A3 change into as follows:
A2. be provided with when Pin1≤Pin＜Pin2, power amplifier is operated in state 3.Be that PA2 continues to operate in Class B or Class C, the Doherty power amplifier that whole like this power amplifier is exactly a standard.Owing to do not limit the saturation power that Pin1 equals PA1 as traditional Doherty, the present invention can be at Pin1 unlatching PA2 during less than the saturation power of PA1, and this can be avoided PA1 to work near saturation power and cause the shortcoming of distortion easily.And early open PA2, shortened the interval that PA1 works independently under the small-power, reduced the chance of chain rupture.
A3. be provided with when Pin2≤Pin＜Pin3, power amplifier is operated in state 2, and promptly link 2 is operated in normal condition, and link 1 is in off state.
In order further to raise the efficiency, the scope of Pin1≤Pin＜Pin2 further can also be divided into two subinterval: Pin1≤Pin＜Pin12 and Pin12≤Pin＜Pin2, power amplifier was operated in state 3 when Pin1≤Pin＜Pin12 was set, and promptly steps A 2 changes following two steps into:
A21. be provided with when Pin1≤Pin＜Pin12, power amplifier is operated in state 3;
A22. be provided with when Pin12≤Pin＜Pin2, power amplifier is operated in state 2.
Here power bracket that also can the five equilibrium input signal, i.e. Pin3-Pin2=Pin2-Pin12=Pin12-Pin1=Pin1, also five equilibrium not.
When signal is imported, determine the operation interval at current input signal place, trigger power amplifier and be operated in the set operating state corresponding with input signal.Signal amplifies through each link of power amplifier, the output after overcoupling merges of the signal after each link amplifies.Coupling need keep the phase place of each link signal identical when merging.
Input signal has multiple mode to realize the unlatching of power amplifier different operating state behind input input power amplifier.For example, input signal and power amplifier bias control circuit comparison is set, determine the operation interval at its place, directly trigger link 1 and link 2 are operated in set operating state respectively, briefly be exactly: if input signal satisfies the unlocking condition of set PA1, PA1 work so, otherwise PA1 closes; If input signal satisfies the unlocking condition of set PA2, PA2 work so, otherwise PA2 closes.Also can realize in conjunction with power divider (abbreviation power splitter), after input signal is gone into two links through power divider with the certain proportion branch, by with the operation interval that relatively draws its place that is provided with of each link bias control circuit, trigger link 1 and link 2 are operated in set operating state respectively.
The present invention can be applied in Ba Lun (Balun) power amplifier equally.The Balun power amplifier as shown in Figure 5, input signal is a unbalanced signal through the Balun Structure Conversion, after the power amplifier link amplifies, by another Balun structure the unbalanced signal that amplifies is converted to balanced signal again.In the present invention, select two active links of different sizes, be without loss of generality, suppose the saturation power of the saturation power of link 1 power tube PA1 less than link 2 power tube PA2, be set to three operating states with top the same its of two link Doherty power amplifiers, its operation principle is the same with top two link Doherty power amplifiers, just how has distinguished the Balun structure when the signal input and output.
The present invention can also expand to the working condition of a plurality of power amplifier links.Fig. 6 is the schematic diagram of a N (N〉2) road Doherty power amplifier, and in traditional Doherty power amplifier, PA1 is a carrier power amplifier, and PA2～PAN is the peak value power amplifier.Its course of work is: input signal has only carrier power amplifier PA1 work when small-power; When entering msp signal, open all peak value power amplifiers simultaneously, perhaps begin the saturated successively next power amplifier link of opening again from PA2, promptly open PA2 earlier, open PA3 after PA2 is saturated, so repeatedly up to opening PAN; When maximum power, all power amplifiers are operated in saturation condition simultaneously.
Among the present invention, each power amplifier offset voltage is controlled among Fig. 6, therefore traditional carrier power amplifier and its peak work be placed among the present invention be not fix but variable, promptly PA2 can be considered as carrier power amplifier, also PAN can be considered as carrier power amplifier, and the power amplifier beyond the carrier power amplifier is considered as the peak value power amplifier.Among the present invention, the mechanism of N road Doherty power amplifier work is summarized as follows: be without loss of generality, suppose by saturation power sort from low to high into PA1＜PA2＜PA3＜...＜PAN, be arranged on and have only PA1 under the low-power level signal input condition in work, increase along with input signal power, power amplifier is operated in different operating states, can reach the purpose of raising the efficiency and increase reliability in the whole range of signal like this.
Be the example explanation with three link Doherty power amplifiers below.Be without loss of generality, can suppose that PA1 is a saturation power minimal power amplifier tube, PA2 is a saturation power time little power amplifier tube, and PA3 is the power amplifier tube of saturation power maximum.Three link Doherty power amplifiers can have following seven kinds of operating states:
State 1, link 1 are operated in normal condition, and link 2 and link 3 turn-off;
State 2, link 2 are operated in normal condition, and link 1 and link 3 turn-off;
State 3, link 3 are operated in normal condition, and link 1 and link 2 turn-off;
State 4, link 1 and link 2 are operated in normal condition, and link 3 turn-offs;
State 5, link 1 and link 3 are operated in normal condition, and link 2 turn-offs;
State 7, link 1, link 2 and link 3 are operated in normal condition.
If PA1 and PA2 saturation power sum are more than or equal to the PA3 saturation power, when being arranged on input power so and increasing gradually, three link Doherty power amplifiers are operated in state 1, state 2, state 3, state 4, state 5, state 6, state 7 successively, the working range that is about to three link Doherty power amplifiers is divided into seven operation intervals, and the operating state of pairing input signal power value of each operation interval and power amplifier is set, as follows:
Be provided with as Pin during less than Pin1, power amplifier is operated in state 1;
Be provided with as Pin during during more than or equal to Pin1 and less than Pin2, power amplifier is operated in state 2;
Be provided with as Pin during during more than or equal to Pin2 and less than Pin3, power amplifier is operated in state 3;
Be provided with as Pin during during more than or equal to Pin3 and less than Pin4, power amplifier is operated in state 4;
Be provided with as Pin during during more than or equal to Pin4 and less than Pin5, power amplifier is operated in state 5;
Be provided with as Pin during during more than or equal to Pin5 and less than Pin6, power amplifier is operated in state 6;
Be provided with as Pin during during more than or equal to Pin6 and less than Pin7, power amplifier is operated in state 7.
If PA1 and PA2 saturation power sum are smaller or equal to the PA3 saturation power, when being arranged on input power so and increasing gradually, three link Doherty power amplifiers are operated in state 1, state 2, state 4, state 3, state 5, state 6, state 7 successively, the working range that is about to three link Doherty power amplifiers is divided into seven operation intervals, and the operating state of pairing input signal power value of each operation interval and power amplifier is set, as follows:
Be provided with as Pin during less than Pin1, power amplifier is operated in state 1;
Be provided with as Pin during during more than or equal to Pin1 and less than Pin2, power amplifier is operated in state 2;
Be provided with as Pin during during more than or equal to Pin2 and less than Pin3, power amplifier is operated in state 4;
Be provided with as Pin during during more than or equal to Pin3 and less than Pin4, power amplifier is operated in state 3;
Be provided with as Pin during during more than or equal to Pin4 and less than Pin5, power amplifier is operated in state 5;
Be provided with as Pin during during more than or equal to Pin5 and less than Pin6, power amplifier is operated in state 6;
Be provided with as Pin during during more than or equal to Pin6 and less than Pin7, power amplifier is operated in state 7.
Among the present invention, can divide three link Doherty power amplifiers and to be less than seven operation interval, for example can be merged into one during more than or equal to Pin5 and less than these two intervals of Pin6 during more than or equal to Pin4 and less than Pin5 and Pin with Pin, promptly be provided with as Pin during during more than or equal to Pin4 and less than Pin6, power amplifier is operated in state 6, and three link Doherty power amplifiers are divided into six operation intervals exactly so.Be not limited to the above-mentioned method that three link Doherty power amplifiers is divided into seven operation intervals so the present invention protects.
Behind the input signal, the course of work of N (N〉2) link power amplifier almost is the same with two link power amplifiers, all be that input signal triggers power amplifier and is operated in set and the corresponding operating state of input signal power value, power amplifier amplifies back output with input signal.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1, a kind of method that improves efficiency power amplifier is characterized in that,
The input signal power scope division of power amplifier that will comprise the power amplifier tube of N road concurrent working is the operation interval more than N; By each power amplifier tube bias control circuit separately is set, the input signal power value of each operation interval correspondence and the operating state of power amplifier are set, when making the signal input, described power amplifier is operated in the operating state corresponding with the current input signal performance number according to the setting of input signal power and described bias control circuit, and wherein N is the integer greater than 1.
2, method according to claim 1 is characterized in that, described power amplifier is two link power amplifiers, described two links are link 1 and link 2, wherein, the saturation power of link 1 power amplifier tube is less than the saturation power of link 2 power amplifier tubes, and this method comprises:
A0. the working range with two link power amplifiers is divided into three operation intervals: between first operation interval, secondary service area, the 3rd operation interval;
A1., the input signal power Pin that the first operation interval correspondence is set is the boundary threshold value Pin1 less than corresponding input signal power scope between described first operation interval and secondary service area, the operating state of power amplifier is: link 1 is operated in normal condition, and link 2 is in off state;
A2., corresponding input signal power Pin is set between the secondary service area for more than or equal to Pin1 and less than between described secondary service area and the boundary threshold value Pin2 of the corresponding input signal power scope of the 3rd operation interval, the operating state of power amplifier is: link 1 is in off state, and link 2 is operated in normal condition;
A3., the input signal power Pin that the 3rd operation interval correspondence is set is for more than or equal to Pin2 and less than the threshold value Pin3 of the corresponding input signal power scope of described the 3rd operation interval, the operating state of power amplifier is: link 1 and link 2 all are operated in normal condition.
3, method according to claim 1 is characterized in that, described power amplifier is two link power amplifiers, described two links are link 1 and link 2, wherein, the saturation power of link 1 power amplifier tube is less than the saturation power of link 2 power amplifier tubes, and this method comprises:
A0. the working range with two link power amplifiers is divided into three operation intervals: between first operation interval, secondary service area, the 3rd operation interval;
A1., the input signal power Pin that the first operation interval correspondence is set is the boundary threshold value Pin1 less than corresponding input signal power scope between described first operation interval and secondary service area, the operating state of power amplifier is: link 1 is operated in normal condition, and link 2 is in off state;
A2., corresponding input signal power Pin is set between the secondary service area for more than or equal to Pin1 and less than between described secondary service area and the boundary threshold value Pin2 of the corresponding input signal power scope of the 3rd operation interval, the operating state of power amplifier is: link 1 and link 2 all are operated in normal condition;
A3., the input signal power Pin that the 3rd operation interval correspondence is set is for more than or equal to Pin2 and less than the threshold value Pin3 of the corresponding input signal power scope of described the 3rd operation interval, the operating state of power amplifier is: link 1 is in off state, and link 2 is operated in normal condition.
4, method according to claim 1 is characterized in that, described power amplifier is two link power amplifiers, described two links are link 1 and link 2, wherein, the saturation power of link 1 power amplifier tube is less than the saturation power of link 2 power amplifier tubes, and this method comprises:
A0. the working range with two link power amplifiers is divided into three operation intervals: first operation interval, comprise between the secondary service area in first subinterval and second subinterval, the 3rd operation interval;
A1., the input signal power Pin that the first operation interval correspondence is set is the threshold value Pin1 less than the corresponding input signal power scope in first subinterval, and the operating state of power amplifier is: link 1 is operated in normal condition, and link 2 is in off state;
A21, the first subinterval correspondence is set input signal power Pin for more than or equal to Pin1 and less than the boundary threshold value Pin12 of the corresponding input signal power scope in described first subinterval and described second subinterval, the operating state of power amplifier is: link 1 and link 2 all are operated in normal condition;
A22, the second subinterval correspondence is set input signal power Pin for more than or equal to Pin12 and less than the threshold value Pin2 of the corresponding input signal power scope in second subinterval, the operating state of power amplifier is: link 1 is in off state, and link 2 is operated in normal condition;
A3., the input signal power Pin that the 3rd operation interval correspondence is set is for more than or equal to Pin2 and less than the threshold value Pin3 of the corresponding input signal power scope of described the 3rd operation interval, the operating state of power amplifier is: link 1 is in off state, and link 2 is operated in normal condition.
5, according to claim 2 or 3 described methods, it is characterized in that, Pin3-Pin2=Pin2-Pin1=Pin1 is set.
6, method according to claim 4 is characterized in that, Pin3-Pin2=Pin2-Pin12=Pin12-Pin1=Pin1 is set.
7, according to the described method of one of claim 2～4, it is characterized in that, the saturation power value that Pin1 equals link 1 power amplifier tube is set.
8, according to claim 2 or 4 described methods, it is characterized in that, the saturation power value that Pin2 equals link 2 power amplifier tubes is set.
9, method according to claim 2 is characterized in that, described two link power amplifiers are that two link Du He carry the Doherty power amplifier.
10, method according to claim 2 is characterized in that, described two link power amplifiers are two link Ba Lun Balun power amplifiers.
11, method according to claim 1, it is characterized in that, described N link power amplifier is three link Doherty power amplifiers, described three links are link 1, link 2 and link 3, wherein, the saturation power minimum of link 1 power amplifier tube, the saturation power maximum of link 3 power amplifier tubes, the saturation power sum of the power amplifier tube of link 1 and link 2 is more than or equal to the saturation power of the power amplifier tube of link 3, and this method comprises:
Three link power amplifiers are divided into seven operation intervals: between first operation interval, secondary service area, the 3rd operation interval, the 4th operation interval, the 5th operation interval, the 6th operation interval, the 7th operation interval;
The input signal power Pin that the first operation interval correspondence is set is the boundary threshold value Pin1 less than corresponding input signal power scope between described first operation interval and secondary service area, the operating state of power amplifier is: link 1 is operated in normal condition, and link 2 and link 3 turn-off;
Corresponding input signal power Pin is set between the secondary service area for more than or equal to Pin1 and less than between described secondary service area and the boundary threshold value Pin2 of the corresponding input signal power scope of the 3rd operation interval, the operating state of power amplifier is: link 2 is operated in normal condition, and link 1 and link 3 turn-off;
The input signal power Pin that the 3rd operation interval correspondence is set is for more than or equal to Pin2 and less than the boundary threshold value Pin3 of described the 3rd operation interval and the corresponding input signal power scope of the 4th operation interval, the operating state of power amplifier is: link 3 is operated in normal condition, and link 1 and link 2 turn-off;
The input signal power Pin that the 4th operation interval correspondence is set is for more than or equal to Pin3 and less than the boundary threshold value Pin4 of described the 4th operation interval and the corresponding input signal power scope of the 5th operation interval, the operating state of power amplifier is: link 1 and link 2 are operated in normal condition, and link 3 turn-offs;
The input signal power Pin that the 5th operation interval correspondence is set is for more than or equal to Pin4 and less than the boundary threshold value Pin5 of described the 5th operation interval and the corresponding input signal power scope of the 6th operation interval, the operating state of power amplifier is: link 1 and link 3 are operated in normal condition, and link 2 turn-offs;
The input signal power Pin that the 6th operation interval correspondence is set is for more than or equal to Pin5 and less than the boundary threshold value Pin6 of described the 6th operation interval and the corresponding input signal power scope of the 7th operation interval, the operating state of power amplifier is: link 2 and link 3 are operated in normal condition, and link 1 turn-offs;
The input signal power Pin that the 7th operation interval correspondence is set is Pin more than or equal to Pin6 and less than the boundary threshold value Pin7 of described the 7th operation interval and the corresponding input signal power scope of the 8th operation interval, the operating state of power amplifier is: link 1, link 2 and link 3 are operated in normal condition.
12, method according to claim 1, it is characterized in that, described N link power amplifier is three link Doherty power amplifiers, described three links are link 1, link 2 and link 3, wherein, the saturation power minimum of link 1 power amplifier tube, the saturation power maximum of link 3 power amplifier tubes, the saturation power sum of the power amplifier tube of link 1 and link 2 is smaller or equal to the saturation power of the power amplifier tube of link 3, and this method comprises:
Three link power amplifiers are divided into seven operation intervals: between first operation interval, secondary service area, the 3rd operation interval, the 4th operation interval, the 5th operation interval, the 6th operation interval, the 7th operation interval;
The input signal power Pin that the first operation interval correspondence is set is the boundary threshold value Pin1 less than corresponding input signal power scope between described first operation interval and secondary service area, the operating state of power amplifier is: link 1 is operated in normal condition, and link 2 and link 3 turn-off;
Corresponding input signal power Pin is set between the secondary service area for more than or equal to Pin1 and less than between described secondary service area and the boundary threshold value Pin2 of the corresponding input signal power scope of the 3rd operation interval, the operating state of power amplifier is: link 2 is operated in normal condition, and link 1 and link 3 turn-off;
The input signal power Pin that the 3rd operation interval correspondence is set is for more than or equal to Pin2 and less than the boundary threshold value Pin3 of described the 3rd operation interval and the corresponding input signal power scope of the 4th operation interval, the operating state of power amplifier is: link 1 and link 2 are operated in normal condition, and link 3 turn-offs;
The input signal power Pin that the 4th operation interval correspondence is set is for more than or equal to Pin3 and less than the boundary threshold value Pin4 of described the 4th operation interval and the corresponding input signal power scope of the 5th operation interval, the operating state of power amplifier is: link 3 is operated in normal condition, and link 1 and link 2 turn-off;
The input signal power Pin that the 5th operation interval correspondence is set is for more than or equal to Pin4 and less than the boundary threshold value Pin5 of described the 5th operation interval and the corresponding input signal power scope of the 6th operation interval, the operating state of power amplifier is: link 1 and link 3 are operated in normal condition, and link 2 turn-offs;
The input signal power Pin that the 6th operation interval correspondence is set is for more than or equal to Pin5 and less than the boundary threshold value Pin6 of described the 6th operation interval and the corresponding input signal power scope of the 7th operation interval, the operating state of power amplifier is: link 2 and link 3 are operated in normal condition, and link 1 turn-offs;
The input signal power Pin that the 7th operation interval correspondence is set is Pin more than or equal to Pin6 and less than the boundary threshold value Pin7 of described the 7th operation interval and the corresponding input signal power scope of the 8th operation interval, the operating state of power amplifier is: link 1, link 2 and link 3 are operated in normal condition.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100020561A CN100488031C (en) | 2005-01-12 | 2005-01-12 | Method for improving efficiency of power amplifier |
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| CNB2005100020561A CN100488031C (en) | 2005-01-12 | 2005-01-12 | Method for improving efficiency of power amplifier |
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| CN100488031C true CN100488031C (en) | 2009-05-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101656514B (en) * | 2009-09-07 | 2011-09-28 | 东南大学 | Gain controllable parallel radio-frequency power amplifier based on matching share |
| CN101888211B (en) * | 2010-07-22 | 2013-08-07 | 华为终端有限公司 | Calibration method of RF power amplifier and device |
| CN102427332B (en) | 2011-11-28 | 2015-04-08 | 华为技术有限公司 | Doherty power amplifier and method and equipment for improving power amplification efficiency of Doherty power amplifier |
| CN103580611A (en) * | 2012-08-10 | 2014-02-12 | 中兴通讯股份有限公司 | Power amplification device and wireless equipment |
| CN104703258B (en) * | 2013-12-06 | 2018-04-27 | 展讯通信（上海）有限公司 | User terminal and its method and device for reducing power consumption |
| US9712119B2 (en) * | 2014-10-25 | 2017-07-18 | Skyworks Solutions, Inc. | Doherty power amplifier with tunable input network |
| CN105490650A (en) * | 2015-12-31 | 2016-04-13 | 智坤（江苏）半导体有限公司 | Power amplifier and application thereof |
| CN112865709A (en) * | 2019-11-28 | 2021-05-28 | 上海华为技术有限公司 | Power amplifier combiner and power amplifier circuit |
| CN114189215A (en) * | 2021-10-29 | 2022-03-15 | 锐石创芯（深圳）科技有限公司 | Radio frequency power amplifying circuit and radio frequency front end module |
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