CN100589320C - Feedforward linear power amplifying circuit and control method thereof - Google Patents
Feedforward linear power amplifying circuit and control method thereof Download PDFInfo
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- CN100589320C CN100589320C CN200710093925A CN200710093925A CN100589320C CN 100589320 C CN100589320 C CN 100589320C CN 200710093925 A CN200710093925 A CN 200710093925A CN 200710093925 A CN200710093925 A CN 200710093925A CN 100589320 C CN100589320 C CN 100589320C
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Abstract
The present invention discloses a front feed linear power amplifying circuit, which comprises a carrier wave offsetting circuit, an error offsetting circuit, a power detecting circuit and a control circuit. Wherein, the error offsetting circuit outputs a signal through a coupler C4. An ultimate output terminal of the front feed linear power amplifying circuit is provided with a coupler C5. In addition, the present invention also discloses a method to control front feed linear power amplification, which ensures a lowest power potential at a load end of the coupler C4 by continuously adjusting abreath adjuster and a phase position adjuster of the carrier wave offsetting circuit. Besides, the breath adjuster and the phase position adjuster are continuously adjusted to ensure a lowest power potential for a distortion signal of the C5. The front feed linear power amplifying circuit and the method can greatly improve efficiency and linearity of the power amplifier, thus simplifying system hardware structure, shortening R&D period, greatly reducing development and production cost and achieving standard and simple production technique and production in large scale.
Description
Technical field
The present invention relates to a kind of power amplification circuit, especially a kind of feedforward linear power amplifying circuit.The invention still further relates to a kind of signal power amplification control method, especially a kind of feedforward linear power amplification control method.
Background technology
Along with the continuous development of present mobile communication technology, the more and more shortage that becomes of 3G development of Communication Technique especially, communication spectrum resource.In order to effectively utilize frequency spectrum resource more, many communication systems all adopt the higher modulation system of the availability of frequency spectrum, most of modulation systems are that the amplitude of carrier wave and phase place are modulated, and these modulation systems will produce the non-permanent envelope modulated signal of big peak-to-average force ratio.Yet bigger peak-to-average force ratio has proposed very high linear requirement to power amplifier, this is because power amplifier has inevitable nonlinear characteristic under high-power signal, can produce serious distortion component and spectrum leakage, thereby bring mutual interference among signals, the quality of influence communication and reduction capability of communication system.In order to improve the communication quality of system, operator requires more and more higher to the linearity of radio-frequency power amplifier and efficient, yet can not satisfy the integration requirements such as performance, power consumption, working signal scope, cost of mobile communication radio system fully based on the high power amplifier of back-off technology.Therefore extensively adopt various linearization techniques now, as feedforward linear method, feedback linearization method, pre-distortion method etc., but the feedforward linear method is a kind of linearization technique that extensively adopts, and is a kind of linearization technique of comparative maturity.
Feedforward linearized method is that the distorted signal that power amplifier produces is extracted, and gains, the adjustment of phase place, is added to the power amplifier output then, eliminates original distortion component in the power amplifier output signal, to obtain maximum linearisation index.This method is closed-loop control owing to what adopt, therefore is subjected to factor affecting such as ambient temperature, operating voltage less, and the linearisation index is higher, the bandwidth of operation broad.And, be of wide application owing to technology maturation.
Present feedforward linear power amplifier generally has two signal cancellation loops, as shown in Figure 1, is called main ring and error loop.Described main ring comprises amplitude regulator, phase regulator main ring power amplifier and main ring delay unit, be divided into two-way behind the signal process coupler C1 of input, one the tunnel passes through described amplitude regulator successively, phase regulator and main ring power amplifier, another road is by described main ring delay unit, the signal of described main ring power amplifier output, take out a part through coupler C2, with through the carrier signal that does not have distortion of described main ring delay unit in coupler C3 place vector addition, by amplitude controller and the phase controller of regulating described main ring, make the two-way carrier signal amplitude equal phase that arrives coupler C3 opposite.Described error loop comprises amplitude regulator, phase regulator, error loop power amplifier and error loop delay unit, signal after described coupler C3 place vector addition, pass through described amplitude regulator, phase regulator and error loop power amplifier successively, another part signal that described coupler C2 does not take out is through described error loop delay unit, and the signal of the signal of described error loop power amplifier output and the output of described error loop delay unit superposes by coupler C4 and exports.Described main ring mainly is the carrier component of eliminating in the main power amplifier output sampled signal, obtains only to comprise because main power amplifier amplifies the error signal of the non-linear distortion products that produces; The error signal that error loop then will be obtained from main ring amplifies, adjust to main power amplifier output signal the nonlinear distortion signal amplitude equates, phase place is opposite level, offset then, distortion component in the main power amplifier output signal is eliminated, to obtain the highest linearity.Also comprise power-sensing circuit in the circuit, described power-sensing circuit one end is connected on described carrier cancellation loop or the described error cancellation loop, the other end is connected on the described control circuit, and the power at described carrier cancellation loop or the described error cancellation loop place of drawing is converted into voltage signal.The signal of coupler C31 after with described coupler C3 vector addition drawn, be connected on the power-sensing circuit, coupler C5 draws the signal of described coupler C4 stack and output, be connected on described another power-sensing circuit, the signal of drawing according to two power-sensing circuits, amplitude regulator and phase regulator to described main ring and error loop are controlled, to improve the linearity of amplifying circuit.But,, be cost but to have sacrificed circuit efficiency though sort circuit has improved the linearity of power amplification.
In now disclosed relevant feedforward linear power amplifier technical literature, various closed loop control methods are arranged.In some documents, recommend to use adaptive tracking cancellation control method, use pilot signal to insert the counteracting loop of the adaptive tracking cancellation control device of feedforward linear power amplifier, as publication number is the Chinese patent " adaptive tracking cancellation control method of feed forward type linear power amplifier and device " of CN1430425A, this method and device more complicated, and owing to pilot signal can not be offset fully, and influence the system linearity performance.
In some document, feedforward system is improved, an error loop counteracting of the increase again loop that has fully for distorted signal is offset, as publication number is the Chinese patent " method of a kind of feedforward linear power amplifying circuit and counteracting intermodulation signal " of CN1167185C, and the counteracting once more of linear distortion is carried out in this invention in the 3rd loop.At publication number is also to have mentioned the method for utilizing carrier leakage effect to improve the linearity of feed-forward amplifier during the Chinese patent of CN1725631A " utilizes carrier leakage effect to improve the method for linearity of feedforward power amplifier ", but these power amplification circuits and method thereof are all too complicated, and can't effectively improve whole efficient.
Summary of the invention
Technical problem to be solved by this invention provides a kind of feedforward linear power amplifying circuit and method, can guarantee to have the good linearity when signal is carried out power amplification, and improve the efficient of power amplification by adopting simple structure.
For solving the problems of the technologies described above, the technical scheme of feedforward linear power amplifying circuit of the present invention is, comprises carrier cancellation loop, error cancellation loop, power-sensing circuit and control circuit,
Described carrier cancellation loop comprises signal conditioner, main ring power amplifier and carrier cancellation loop delay unit, described signal conditioner comprises amplitude regulator and phase regulator, be divided into two-way behind the signal process coupler C1 of input, one the tunnel passes through described signal conditioner and main ring power amplifier successively, another road is by described carrier cancellation loop delay unit, the signal of described main ring power amplifier output, take out a part through coupler C2, with through the carrier signal that does not have distortion of described carrier cancellation loop delay unit in coupler C3 place vector addition;
Described error cancellation loop comprises signal conditioner, error loop power amplifier and error cancellation loop delay unit, described signal conditioner comprises amplitude regulator and phase regulator, signal after described coupler C3 place vector addition, pass through described signal conditioner and error loop power amplifier successively, another part signal that described coupler C2 does not take out is through described error cancellation loop delay unit, and the signal of the signal of described error loop power amplifier output and the output of described error cancellation loop delay unit carries out vector addition and output by coupler C4;
Described power-sensing circuit one end is connected on described carrier cancellation loop or the described error cancellation loop, the other end is connected on the described control circuit, the power at described carrier cancellation loop or the described error cancellation loop place of drawing is converted into voltage signal, be input in the described control circuit, described power-sensing circuit comprises first power-sensing circuit, second power-sensing circuit and the 3rd power-sensing circuit, the signal of coupler C31 after with described coupler C3 vector addition drawn, be connected to described first power-sensing circuit, the load end of described coupler C4 is connected to described second power-sensing circuit, coupler C5 draws the signal of described coupler C4 vector addition and output, is connected to described the 3rd power-sensing circuit;
Described control circuit comprises processor, described processor is handled the signal of described power-sensing circuit input, output signal is connected to the amplitude regulator and the phase regulator of described carrier cancellation loop afterwards, and the amplitude regulator of described error cancellation loop and phase regulator, to the amplitude regulator and the phase regulator of described carrier cancellation loop, and the amplitude regulator of described error cancellation loop and phase regulator are controlled.
The technical scheme of feedforward linear power amplification control method of the present invention is to comprise the steps:
(1) circuit powers on, and described control circuit is gathered the signal of described first power-sensing circuit, and the amplitude regulator and the phase regulator of described carrier cancellation loop are regulated, and makes the signal value minimum of described first power-sensing circuit;
(2) described control circuit is gathered the signal of described the 3rd power-sensing circuit, and the amplitude regulator and the phase regulator of described error cancellation loop are regulated, and makes the signal value minimum of described the 3rd power-sensing circuit;
(3) described control circuit is gathered the signal of described second power-sensing circuit, and the amplitude regulator and the phase regulator of described carrier cancellation loop are regulated, and makes the signal value minimum of described second power-sensing circuit;
(4) cycling jump is to step (2).
Feedforward linear power amplifying circuit of the present invention and method have improved feedforward linear power amplifier efficient and linearity greatly, system hardware is constituted simplify, shortened the R﹠D cycle, exploitation and production cost also significantly reduce, and production technology standardization, simplification help large-scale mass production.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and Examples:
Fig. 1 is the circuit diagram of existing feedforward linear power amplifying circuit;
Fig. 2 is the circuit diagram of feedforward linear power amplifying circuit of the present invention;
Fig. 3 is the flow chart of feedforward linear power amplification control method of the present invention;
Fig. 4 is the flow chart of step (1) in the feedforward linear power amplification control method of the present invention;
Fig. 5 is the flow chart of step (2) in the feedforward linear power amplification control method of the present invention;
Fig. 6 is the flow chart of step (3) in the feedforward linear power amplification control method of the present invention.
Embodiment
Feedforward linear power amplifying circuit of the present invention, its circuit diagram can comprise carrier cancellation loop, error cancellation loop, power-sensing circuit and control circuit referring to shown in Figure 2,
Described carrier cancellation loop comprises signal conditioner, main ring power amplifier and carrier cancellation loop delay unit, described signal conditioner comprises amplitude regulator and phase regulator, the priority position relation of described amplitude regulator and described phase regulator can be arbitrarily, be divided into two-way behind the signal process coupler C1 of input, one the tunnel passes through described signal conditioner and main ring power amplifier successively, another road is by described carrier cancellation loop delay unit, the signal of described main ring power amplifier output, take out a part through coupler C2, with through the carrier signal that does not have distortion of described carrier cancellation loop delay unit in coupler C3 place vector addition; Described carrier cancellation loop also comprises simulated pre-distortion circuit, and described simulated pre-distortion circuit is arranged at before the described main ring power amplifier, and the priority position of described simulated pre-distortion circuit and described signal conditioner relation can be arbitrarily;
Described error cancellation loop comprises signal conditioner, error loop power amplifier and error cancellation loop delay unit, described signal conditioner comprises amplitude regulator and phase regulator, the priority position relation of described amplitude regulator and described phase regulator can be arbitrarily, signal after described coupler C3 place vector addition, pass through described signal conditioner and error loop power amplifier successively, another part signal that described coupler C2 does not take out is through described error cancellation loop delay unit, and the signal of the signal of described error loop power amplifier output and the output of described error cancellation loop delay unit is by coupler C4 vector addition and output; Described error cancellation loop also comprises simulated pre-distortion circuit, and described simulated pre-distortion circuit is arranged at before the described error loop power amplifier, and the priority position of described simulated pre-distortion circuit and described signal conditioner relation can be arbitrarily;
Described power-sensing circuit one end is connected on described carrier cancellation loop or the described error cancellation loop, the other end is connected on the described control circuit, the power at described carrier cancellation loop or the described error cancellation loop place of drawing is converted into voltage signal, is input in the described control circuit; Described power-sensing circuit comprises attenuator, carrier signal detector and A/D converter, described attenuator, carrier signal detector and A/D converter are connected successively, described attenuator is connected on described carrier cancellation loop or the described error cancellation loop, and described A/D converter is connected on the described control circuit; Described power-sensing circuit comprises first power-sensing circuit, second power-sensing circuit and the 3rd power-sensing circuit, the signal of coupler C31 after with described coupler C3 vector addition drawn, be connected to described first power-sensing circuit, the load end of described coupler C4 is connected to described second power-sensing circuit, coupler C5 draws the signal of described coupler C4 vector addition and output, is connected to described the 3rd power-sensing circuit;
Described control circuit can adopt single-chip microcomputer (MCU) system, comprise processor, described processor is handled the signal of described power-sensing circuit input, output signal is connected to the amplitude regulator and the phase regulator of described carrier cancellation loop afterwards, and the amplitude regulator of described error cancellation loop and phase regulator, to the amplitude regulator and the phase regulator of described carrier cancellation loop, and the amplitude regulator of described error cancellation loop and phase regulator are controlled; In the described control circuit, the output of processor is connected to the amplitude regulator and the phase regulator of described carrier cancellation loop and the amplitude regulator of described error cancellation loop and phase regulator by D/A converter; As shown in fig. 1,4 signals of described processor output are by after the D/A converter, be respectively MA, MP, EA and EP, the amplitude regulator of the described carrier cancellation loop of described MA signal controlling, the phase regulator of the described carrier cancellation loop of described MP signal controlling, the amplitude regulator of the described error cancellation loop of described EA signal controlling, the phase regulator of the described error cancellation loop of described EP signal controlling.
The major function of described carrier cancellation loop is to extract carrier signal to amplify the distortion component that produces by the main ring power amplifier; While reserve part carrier signal, the major function of error cancellation loop is to amplify distortion component and the part carrier component that carrier cancellation loop produces, offset the distortion component that main power amplifier produces by amplitude of accommodation adjuster and phase regulator then, carrier signal addition simultaneously, make the signal power maximum of final output, reach the linearity of improving amplifier and the purpose of raising the efficiency.
Input carrier signal is divided into two paths of signals by coupler C1, one road signal is sent into the delay unit branch road, other one the tunnel sends into described carrier cancellation loop, because the main ring power amplifier is non-linear, through in the described carrier cancellation loop amplified output signal distortion component has been arranged just, take out the carrier wave that does not have distortion of a part of signal and process delay unit in coupler C3 place vector addition through coupler C2, by amplitude controller and the phase controller of regulating described carrier cancellation loop, make the two-way carrier signal amplitude equal phase that arrives coupler C3 opposite, by only containing distortion component on the signal theory of carrier cancellation loop, this is the initial closed loop of main ring like this.In error cancellation loop, the pure distortion component of carrier cancellation loop output by the error loop power amplifier after again with being superposeed by coupler C4 that main power amplifier is exported by the carrier wave of non-linear amplification (having distortion component), by adjusting the amplitude controller and the phase controller of error loop, detect at C5, export the high-power carrier signal of a undistorted substantially component at last, and then change the amplitude controller and the phase controller of main ring again, make the load end power level of C4 minimum, thereby reach the effect of optimizing linear and efficient.Coupler C31 is the initial closed power test point of main ring; The load end of C4 is that the power of the final closed loop of main ring is offset test point, and C5 is system's final distortions test point.Amplitude and phase regulator by continuous adjustment main ring in the work of reality make the power level of C4 load end minimum, the power maximum of system output this moment just, the amplitude of continuous adjustment error loop and the distorted signal power level that phase regulator makes C5 are minimum, and just Ci Shi distortion cancellation is best.Amplitude regulator is made up of electric adjustable attenuator, and phase regulator is formed with phase shifter.
Use the analog predistortion technology among the present invention, in described carrier cancellation loop and error cancellation loop, all included simulated pre-distortion circuit.The amplifier nonlinearity characteristic generally adopts AM/AM and AM/PM to represent.AM/AM refers to output level with the characteristic that incoming level changes, and represents the amplifier amplitude non-linearity; AM/PM refers to the characteristic of the phase difference of input and output with the incoming level variation, the principle of predistortion is according to amplifier nonlinearity characteristic (amplitude and phase distortion), signal to input amplifier carries out opposite distortion processing, two nonlinear distortion functions combine, and just can realize highly linear, undistorted system.Application simulation pre-distortion technology among the present invention, improve the linearity of power amplifier greatly, suppress spectral re-growth better, not only improved the linearity of main ring power amplifier and error loop power amplifier, main ring power amplifier and error loop power amplifier are worked under rollback power seldom, improve the linearity of main ring and error loop power amplifier respectively, finally also improved system linearity and efficient.
Main ring power amplifier and error loop power amplifier can adopt the Doherty amplifier among the present invention.Described Doherty amplifier comprises two parts: a carrier amplifier C (Carrier), a peak amplifier P (Peak).Carrier amplifier can be operated near saturated state, thereby obtains greater efficiency, and most of signal amplifies by this amplifier; Peak amplifier is only just worked when peak value arrives, and the most of the time is consumed power not.The linear zone of their synthetic input-output characteristic has expansion significantly than the linear zone of single amplifier, thereby has obtained very high efficient guaranteeing that signal drops under the prerequisite of linear zone.
The invention also discloses a kind of feedforward linear power amplification control method of utilizing above-mentioned circuit to realize, its flow process comprises the steps: as shown in Figure 3
(1) circuit powers on, and described control circuit is gathered the signal of described first power-sensing circuit, and the amplitude regulator and the phase regulator of described carrier cancellation loop are regulated, and makes the signal value minimum of described first power-sensing circuit;
(2) described control circuit is gathered the signal of described the 3rd power-sensing circuit, and the amplitude regulator and the phase regulator of described error cancellation loop are regulated, and makes the signal value minimum of described the 3rd power-sensing circuit;
(3) described control circuit is gathered the signal of described second power-sensing circuit, and the amplitude regulator and the phase regulator of described carrier cancellation loop are regulated, and makes the signal value minimum of described second power-sensing circuit;
(4) cycling jump is to step (2).
In the feedforward linear power amplification control method of the present invention, in the time of the signal minimum of described power-sensing circuit, the two paths of signals amplitude that the coupler that just described power-sensing circuit is connected with described carrier cancellation loop or error cancellation loop is imported equates that phase place is opposite.
Feedforward linear power amplification control method of the present invention is by the continuous circulation of above-mentioned steps (2), (3), (4), finally search out the amplitude control voltage and the phase control voltage MA of this high efficiency feedforward linear power amplifier, MP, EA, the optimal working point of EP, and make it stable fast, realize the optimum of distorted signal is offseted, keep the magnitude of voltage of signal V3 of the signal V2 of second power-sensing circuit and the 3rd power-sensing circuit minimum all the time, make the efficient of system and linearity reach the highest.
The flow process of described step (1) specifically comprises the steps:
(a) after circuit powers on, the circuit initialization, described control circuit is gathered the signal V1 of described first power-sensing circuit;
(b) the signal MA of described control circuit regulates described amplitude regulator to a direction;
(c) described control circuit is gathered the signal V1 of described first power-sensing circuit again;
(d) if with compare before, the signal V1 of described first power-sensing circuit diminishes, then signal MA continues to regulate described amplitude regulator according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal V1 of described first power-sensing circuit becomes, then signal MA regulates described amplitude regulator in the opposite direction;
(e) described control circuit is gathered the signal V1 of described first power-sensing circuit again;
(f) if with compare before, the signal V1 of described first power-sensing circuit diminishes, then signal MA continues to regulate described amplitude regulator according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal V1 of described first power-sensing circuit becomes, then signal MP regulates described phase regulator to a direction;
(g) described control circuit is gathered the signal V1 of described first power-sensing circuit again;
(h) if with compare before, the signal V1 of described first power-sensing circuit diminishes, then signal MP continues to regulate described phase regulator according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal V1 of described first power-sensing circuit becomes, then signal MP regulates described phase regulator in the opposite direction;
(i) described control circuit is gathered the signal V1 of described first power-sensing circuit again;
(j) if with compare before, the signal V1 of described first power-sensing circuit diminishes, then signal MP continues to regulate described phase regulator according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal V1 of described first power-sensing circuit becomes, then step (1) finishes.
In the described step (1), also can regulate described phase regulator earlier, afterwards described amplitude regulator be regulated,, specifically comprise the steps: referring to shown in Figure 4
(a) after circuit powers on, described control circuit is gathered the signal V1 of described first power-sensing circuit;
(b) the signal MP of described control circuit regulates described phase regulator to a direction;
(c) described control circuit is gathered the signal V1 of described first power-sensing circuit again;
(d) if with compare before, the signal V1 of described first power-sensing circuit diminishes, then signal MP continues to regulate described phase regulator according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal V1 of described first power-sensing circuit becomes, then signal MP regulates described phase regulator in the opposite direction;
(e) described control circuit is gathered the signal V1 of described first power-sensing circuit again;
(f) if with compare before, the signal V1 of described first power-sensing circuit diminishes, then signal MP continues to regulate described phase regulator according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal V1 of described first power-sensing circuit becomes, then signal MA regulates described amplitude regulator to a direction;
(g) described control circuit is gathered the signal V1 of described first power-sensing circuit again;
(h) if with compare before, the signal V1 of described first power-sensing circuit diminishes, then signal MA continues to regulate described amplitude regulator according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal V1 of described first power-sensing circuit becomes, then signal MA regulates described amplitude regulator in the opposite direction;
(i) described control circuit is gathered the signal V1 of described first power-sensing circuit again;
(j) if with compare before, the signal V1 of described first power-sensing circuit diminishes, then signal MA continues to regulate described amplitude regulator according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal V1 of described first power-sensing circuit becomes, then step (1) finishes.
The flow process of described step (2) specifically comprises the steps:
(a) described control circuit is gathered the signal V3 of described the 3rd power-sensing circuit;
(b) the signal EP of described control circuit regulates described amplitude regulator to a direction;
(c) described control circuit is gathered the signal V3 of described the 3rd power-sensing circuit again;
(d) if with compare before, the signal V3 of described the 3rd power-sensing circuit diminishes, then signal EP continues to regulate described amplitude controller according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal V3 of described the 3rd power-sensing circuit becomes, then signal EP regulates described amplitude regulator in the opposite direction;
(e) described control circuit is gathered the signal V3 of described the 3rd power-sensing circuit again;
(f) if with compare before, the signal V3 of described the 3rd power-sensing circuit diminishes, then signal EP continues to regulate described amplitude controller according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal V3 of described the 3rd power-sensing circuit becomes, then signal EA regulates described phase regulator to a direction;
(g) described control circuit is gathered the signal V3 of described the 3rd power-sensing circuit again;
(h) if with compare before, the signal V3 of described the 3rd power-sensing circuit diminishes, then signal EA continues to regulate described phase controller according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal V3 of described the 3rd power-sensing circuit becomes, then signal EA regulates described phase regulator in the opposite direction;
(i) described control circuit is gathered the signal V3 of described the 3rd power-sensing circuit again;
(j) if with compare before, the signal V3 of described the 3rd power-sensing circuit diminishes, then signal EA continues to regulate described phase controller according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal V3 of described the 3rd power-sensing circuit becomes, then step (2) finishes.
In the described step (2), also can regulate described phase regulator earlier, afterwards described amplitude regulator be regulated,, specifically comprise the steps: referring to shown in Figure 5
(a) described control circuit is gathered the signal V3 of described the 3rd power-sensing circuit;
(b) the signal EA of described control circuit regulates described phase regulator to a direction;
(c) described control circuit is gathered the signal V3 of described the 3rd power-sensing circuit again;
(d) if with compare before, the signal V3 of described the 3rd power-sensing circuit diminishes, then signal EA continues to regulate described phase regulator according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal V3 of described the 3rd power-sensing circuit becomes, then signal EA regulates described phase regulator in the opposite direction;
(e) described control circuit is gathered the signal V3 of described the 3rd power-sensing circuit again;
(f) if with compare before, the signal V3 of described the 3rd power-sensing circuit diminishes, then signal EA continues to regulate described phase regulator according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal V3 of described the 3rd power-sensing circuit becomes, then signal EP regulates described amplitude regulator to a direction;
(g) described control circuit is gathered the signal V3 of described the 3rd power-sensing circuit again;
(h) if with compare before, the signal V3 of described the 3rd power-sensing circuit diminishes, then signal EP continues to regulate described amplitude regulator according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal V3 of described the 3rd power-sensing circuit becomes, then signal EP regulates described amplitude regulator in the opposite direction;
(i) described control circuit is gathered the signal V3 of described the 3rd power-sensing circuit again;
(j) if with compare before, the signal V3 of described the 3rd power-sensing circuit diminishes, then signal EP continues to regulate described amplitude regulator according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal V3 of described the 3rd power-sensing circuit becomes, then step (2) finishes.
The flow process of described step (3) specifically comprises the steps:
(a) described control circuit is gathered the signal V2 of described second power-sensing circuit;
(b) the signal MP of described control circuit regulates described amplitude regulator to a direction;
(c) described control circuit is gathered the signal V2 of described second power-sensing circuit again;
(d) if with compare before, the signal V2 of described second power-sensing circuit diminishes, then signal MP continues to regulate described amplitude controller according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal V2 of described second power-sensing circuit becomes, then signal MP regulates described amplitude regulator in the opposite direction;
(e) described control circuit is gathered the signal V2 of described second power-sensing circuit again;
(f) if with compare before, the signal V2 of described second power-sensing circuit diminishes, then signal MP continues to regulate described amplitude controller according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal V2 of described second power-sensing circuit becomes, then signal MA regulates described phase regulator to a direction;
(g) described control circuit is gathered the signal V2 of described second power-sensing circuit again;
(h) if with compare before, the signal V2 of described second power-sensing circuit diminishes, then signal MA continues to regulate described phase controller according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal V2 of described second power-sensing circuit becomes, then signal MA regulates described phase regulator in the opposite direction;
(i) described control circuit is gathered the signal V2 of described second power-sensing circuit again;
(j) if with compare before, the signal V2 of described second power-sensing circuit diminishes, then signal MA continues to regulate described phase controller according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal V2 of described second power-sensing circuit becomes, then step (3) finishes.
In the described step (3), also can regulate described phase regulator earlier, afterwards described amplitude regulator be regulated,, specifically comprise the steps: referring to shown in Figure 6
(a) described control circuit is gathered the signal V2 of described second power-sensing circuit;
(b) the signal MA of described control circuit regulates described phase regulator to a direction;
(c) described control circuit is gathered the signal V2 of described second power-sensing circuit again;
(d) if with compare before, the signal V2 of described second power-sensing circuit diminishes, then signal MA continues to regulate described phase regulator according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal V2 of described second power-sensing circuit becomes, then signal MA regulates described phase regulator in the opposite direction;
(e) described control circuit is gathered the signal V2 of described second power-sensing circuit again;
(f) if with compare before, the signal V2 of described second power-sensing circuit diminishes, then signal MA continues to regulate described phase regulator according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal V2 of described second power-sensing circuit becomes, then signal MP regulates described amplitude regulator to a direction;
(g) described control circuit is gathered the signal V2 of described second power-sensing circuit again;
(h) if with compare before, the signal V2 of described second power-sensing circuit diminishes, then signal MP continues to regulate described amplitude regulator according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal V2 of described second power-sensing circuit becomes, then signal MP regulates described amplitude regulator in the opposite direction;
(i) described control circuit is gathered the signal V2 of described second power-sensing circuit again;
(j) if with compare before, the signal V2 of described second power-sensing circuit diminishes, then signal MP continues to regulate described amplitude regulator according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal V2 of described second power-sensing circuit becomes, then step (3) finishes.
Described step (1), step (2) or step (3) self circulates repeatedly, till the signal of described power-sensing circuit no longer diminishes.For example, in described step (1), regulate for described phase regulator, make the V1 signal diminish to greatest extent, more described amplitude regulator is regulated afterwards, make the V1 signal diminish to greatest extent again, if at this moment re-execute step (1) again, promptly more described phase regulator is regulated, might make the V1 signal can reduce again, therefore such circulation execution in step (1) makes the signal of described signal deteching circuit become minimum to greatest extent.And this circulation can endlessly not go on, because the signal of described signal deteching circuit always reaches a minimum value.
The present invention adopts directly the distortion cancellation to error loop to detect, and has simplified error loop control principle and control method greatly, design difficulty of Jian Shaoing and debugging difficulty simultaneously, the integrated level of the system of increase; Feedforward linear power amplification control method provided by the present invention has improved the efficient of feed forward power amplifier; Through facts have proved, on original feedforward linear power amplification control method basis, can effectively raise the efficiency 3～5 percentage points at least; Feedforward linear power amplifying circuit of the present invention simple in structure do not have complicated hardware circuit and software requirement, and be very convenient for the upgrading of existing system, reduced the cost of system upgrade, is very significant to exploitation, debugging and the production of system; Adopt the analog predistortion technology in the feedforward linear power amplifying circuit of the present invention, improved the linear properties of main ring power amplifier and error loop power amplifier, thereby improved system linear and efficient.The power amplifier of main ring and error loop adopts the Doherty amplifier, makes the efficient of system improve 8～10 percentage points.
In a word, feedforward linear power amplifying circuit of the present invention and method, feedforward linear power amplifier efficient and linearity have been improved greatly, system hardware is constituted to be simplified, shortened the R﹠D cycle, exploitation and production cost also significantly reduce, and production technology standardization, simplification help large-scale mass production.
Claims (15)
1. a feedforward linear power amplifying circuit comprises carrier cancellation loop, error cancellation loop, power-sensing circuit and control circuit,
Described carrier cancellation loop comprises signal conditioner, main ring power amplifier and carrier cancellation loop delay unit, described signal conditioner comprises amplitude regulator and phase regulator, be divided into two-way behind the signal process coupler Cl of input, one the tunnel passes through described signal conditioner and main ring power amplifier successively, another road is by described carrier cancellation loop delay unit, the signal of described main ring power amplifier output, take out a part through coupler C2, with through the carrier signal that does not have distortion of described carrier cancellation loop delay unit in coupler C3 place vector addition;
Described error cancellation loop comprises signal conditioner, error loop power amplifier and error cancellation loop delay unit, described signal conditioner comprises amplitude regulator and phase regulator, signal after described coupler C3 place vector addition, pass through described signal conditioner and error loop power amplifier successively, another part signal that described coupler C2 does not take out is through described error cancellation loop delay unit, and the signal of the signal of described error loop power amplifier output and the output of described error cancellation loop delay unit is by coupler C4 vector addition and output;
It is characterized in that,
Described power-sensing circuit one end is connected on described carrier cancellation loop or the described error cancellation loop, the other end is connected on the described control circuit, the power at described carrier cancellation loop or the described error cancellation loop place of drawing is converted into voltage signal, be input in the described control circuit, described power-sensing circuit comprises first power-sensing circuit, second power-sensing circuit and the 3rd power-sensing circuit, the signal of coupler C31 after with described coupler C3 vector addition drawn, be connected to described first power-sensing circuit, the load end of described coupler C4 is connected to described second power-sensing circuit, coupler C5 draws the signal of described coupler C4 vector addition and output, is connected to described the 3rd power-sensing circuit;
Described control circuit comprises processor, described processor is handled the signal of described power-sensing circuit input, output signal is connected to the amplitude regulator and the phase regulator of described carrier cancellation loop afterwards, and the amplitude regulator of described error cancellation loop and phase regulator, to the amplitude regulator and the phase regulator of described carrier cancellation loop, and the amplitude regulator of described error cancellation loop and phase regulator are controlled.
2. feedforward linear power amplifying circuit according to claim 1, it is characterized in that, described power-sensing circuit comprises attenuator, carrier signal detector and A/D converter, described attenuator, carrier signal detector and A/D converter are connected successively, described attenuator is connected on described carrier cancellation loop or the described error cancellation loop, and described A/D converter is connected on the described control circuit.
3. feedforward linear power amplifying circuit according to claim 1, it is characterized in that, in the described control circuit, the output of processor is connected to the amplitude regulator and the phase regulator of described carrier cancellation loop and the amplitude regulator of described error cancellation loop and phase regulator by D/A converter.
4. feedforward linear power amplifying circuit according to claim 1 is characterized in that, described main ring power amplifier adopts the Doherty amplifier.
5. feedforward linear power amplifying circuit according to claim 1 is characterized in that, described error loop power amplifier adopts the Doherty amplifier.
6. feedforward linear power amplifying circuit according to claim 1 is characterized in that described carrier cancellation loop also comprises simulated pre-distortion circuit, and described simulated pre-distortion circuit is arranged at before the described main ring power amplifier.
7. feedforward linear power amplifying circuit according to claim 1 is characterized in that described error cancellation loop also comprises simulated pre-distortion circuit, and described simulated pre-distortion circuit is arranged at before the described error loop power amplifier.
8. a feedforward linear power amplification control method of utilizing circuit as claimed in claim 1 to realize is characterized in that, comprises the steps:
(1) circuit powers on, and described control circuit is gathered the signal of described first power-sensing circuit, and the amplitude regulator and the phase regulator of described carrier cancellation loop are regulated, and makes the signal value minimum of described first power-sensing circuit;
(2) described control circuit is gathered the signal of described the 3rd power-sensing circuit, and the amplitude regulator and the phase regulator of described error cancellation loop are regulated, and makes the signal value minimum of described the 3rd power-sensing circuit;
(3) described control circuit is gathered the signal of described second power-sensing circuit, and the amplitude regulator and the phase regulator of described carrier cancellation loop are regulated, and makes the signal value minimum of described second power-sensing circuit;
(4) cycling jump is to step (2).
9. feedforward linear power amplification control method according to claim 8 is characterized in that, in the described step (1), comprises the steps:
(a) after circuit powers on, described control circuit is gathered the signal of described first power-sensing circuit;
(b) described control circuit is regulated described amplitude regulator to a direction;
(c) described control circuit is gathered the signal of described first power-sensing circuit again;
(d) if with compare before, the signal of described first power-sensing circuit diminishes, and then continues to regulate described amplitude regulator according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal of described first power-sensing circuit becomes, and then regulates described amplitude regulator in the opposite direction;
(e) described control circuit is gathered the signal of described first power-sensing circuit again;
(f) if with compare before, the signal of described first power-sensing circuit diminishes, and then continues to regulate described amplitude regulator according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal of described first power-sensing circuit becomes, and then regulates described phase regulator to a direction;
(g) described control circuit is gathered the signal of described first power-sensing circuit again;
(h) if with compare before, the signal of described first power-sensing circuit diminishes, and then continues to regulate described phase regulator according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal of described first power-sensing circuit becomes, and then regulates described phase regulator in the opposite direction;
(i) described control circuit is gathered the signal of described first power-sensing circuit again;
(j) if with compare before, the signal of described first power-sensing circuit diminishes, and then continues to regulate described phase regulator according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal of described first power-sensing circuit becomes, then step (1) finishes.
10. feedforward linear power amplification control method according to claim 8 is characterized in that, in the described step (1), comprises the steps:
(a) after circuit powers on, described control circuit is gathered the signal of described first power-sensing circuit;
(b) described control circuit is regulated described phase regulator to a direction;
(c) described control circuit is gathered the signal of described first power-sensing circuit again;
(d) if with compare before, the signal of described first power-sensing circuit diminishes, and then continues to regulate described phase regulator according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal of described first power-sensing circuit becomes, and then regulates described phase regulator in the opposite direction;
(e) described control circuit is gathered the signal of described first power-sensing circuit again;
(f) if with compare before, the signal of described first power-sensing circuit diminishes, and then continues to regulate described phase regulator according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal of described first power-sensing circuit becomes, and then regulates described amplitude regulator to a direction;
(g) described control circuit is gathered the signal of described first power-sensing circuit again;
(h) if with compare before, the signal of described first power-sensing circuit diminishes, and then continues to regulate described amplitude regulator according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal of described first power-sensing circuit becomes, and then regulates described amplitude regulator in the opposite direction;
(i) described control circuit is gathered the signal of described first power-sensing circuit again;
(j) if with compare before, the signal of described first power-sensing circuit diminishes, and then continues to regulate described amplitude regulator according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal of described first power-sensing circuit becomes, then step (1) finishes.
11. feedforward linear power amplification control method according to claim 8 is characterized in that, in the described step (2), comprises the steps:
(a) described control circuit is gathered the signal of described the 3rd power-sensing circuit;
(b) described control circuit is regulated described amplitude regulator to a direction;
(c) described control circuit is gathered the signal of described the 3rd power-sensing circuit again;
(d) if with compare before, the signal of described the 3rd power-sensing circuit diminishes, and then continues to regulate described amplitude controller according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal of described the 3rd power-sensing circuit becomes, and then regulates described amplitude regulator in the opposite direction;
(e) described control circuit is gathered the signal of described the 3rd power-sensing circuit again;
(f) if with compare before, the signal of described the 3rd power-sensing circuit diminishes, and then continues to regulate described amplitude controller according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal of described the 3rd power-sensing circuit becomes, and then regulates described phase regulator to a direction;
(g) described control circuit is gathered the signal of described the 3rd power-sensing circuit again;
(h) if with compare before, the signal of described the 3rd power-sensing circuit diminishes, and then continues to regulate described phase controller according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal of described the 3rd power-sensing circuit becomes, and then regulates described phase regulator in the opposite direction;
(i) described control circuit is gathered the signal of described the 3rd power-sensing circuit again;
(j) if with compare before, the signal of described the 3rd power-sensing circuit diminishes, and then continues to regulate described phase controller according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal of described the 3rd power-sensing circuit becomes, then step (2) finishes.
12. feedforward linear power amplification control method according to claim 8 is characterized in that, in the described step (2), comprises the steps:
(a) described control circuit is gathered the signal of described the 3rd power-sensing circuit;
(b) described control circuit is regulated described phase regulator to a direction;
(c) described control circuit is gathered the signal of described the 3rd power-sensing circuit again;
(d) if with compare before, the signal of described the 3rd power-sensing circuit diminishes, and then continues to regulate described phase regulator according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal of described the 3rd power-sensing circuit becomes, and then regulates described phase regulator in the opposite direction;
(e) described control circuit is gathered the signal of described the 3rd power-sensing circuit again;
(f) if with compare before, the signal of described the 3rd power-sensing circuit diminishes, and then continues to regulate described phase regulator according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal of described the 3rd power-sensing circuit becomes, and then regulates described amplitude regulator to a direction;
(g) described control circuit is gathered the signal of described the 3rd power-sensing circuit again;
(h) if with compare before, the signal of described the 3rd power-sensing circuit diminishes, and then continues to regulate described amplitude regulator according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal of described the 3rd power-sensing circuit becomes, and then regulates described amplitude regulator in the opposite direction;
(i) described control circuit is gathered the signal of described the 3rd power-sensing circuit again;
(j) if with compare before, the signal of described the 3rd power-sensing circuit diminishes, and then continues to regulate described amplitude regulator according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal of described the 3rd power-sensing circuit becomes, then step (2) finishes.
13. feedforward linear power amplification control method according to claim 8 is characterized in that, in the described step (3), comprises the steps:
(a) described control circuit is gathered the signal of described second power-sensing circuit;
(b) described control circuit is regulated described amplitude regulator to a direction;
(c) described control circuit is gathered the signal of described second power-sensing circuit again;
(d) if with compare before, the signal of described second power-sensing circuit diminishes, and then continues to regulate described amplitude controller according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal of described second power-sensing circuit becomes, and then regulates described amplitude regulator in the opposite direction;
(e) described control circuit is gathered the signal of described second power-sensing circuit again;
(f) if with compare before, the signal of described second power-sensing circuit diminishes, and then continues to regulate described amplitude controller according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal of described second power-sensing circuit becomes, and then regulates described phase regulator to a direction;
(g) described control circuit is gathered the signal of described second power-sensing circuit again;
(h) if with compare before, the signal of described second power-sensing circuit diminishes, and then continues to regulate described phase controller according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal of described second power-sensing circuit becomes, and then regulates described phase regulator in the opposite direction;
(i) described control circuit is gathered the signal of described second power-sensing circuit again;
(j) if with compare before, the signal of described second power-sensing circuit diminishes, and then continues to regulate described phase controller according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal of described second power-sensing circuit becomes, then step (3) finishes.
14. feedforward linear power amplification control method according to claim 8 is characterized in that, in the described step (3), comprises the steps:
(a) described control circuit is gathered the signal of described second power-sensing circuit;
(b) described control circuit is regulated described phase regulator to a direction;
(c) described control circuit is gathered the signal of described second power-sensing circuit again;
(d) if with compare before, the signal of described second power-sensing circuit diminishes, and then continues to regulate described phase regulator according to this direction, jumps to step (c) afterwards; If with compare before, it is big that the signal of described second power-sensing circuit becomes, and then regulates described phase regulator in the opposite direction;
(e) described control circuit is gathered the signal of described second power-sensing circuit again;
(f) if with compare before, the signal of described second power-sensing circuit diminishes, and then continues to regulate described phase regulator according to this direction, jumps to step (e) afterwards; If with compare before, it is big that the signal of described second power-sensing circuit becomes, and then regulates described amplitude regulator to a direction;
(g) described control circuit is gathered the signal of described second power-sensing circuit again;
(h) if with compare before, the signal of described second power-sensing circuit diminishes, and then continues to regulate described amplitude regulator according to this direction, jumps to step (g) afterwards; If with compare before, it is big that the signal of described second power-sensing circuit becomes, and then regulates described amplitude regulator in the opposite direction;
(i) described control circuit is gathered the signal of described second power-sensing circuit again;
(j) if with compare before, the signal of described second power-sensing circuit diminishes, and then continues to regulate described amplitude regulator according to this direction, jumps to step (i) afterwards; If with compare before, it is big that the signal of described second power-sensing circuit becomes, then step (3) finishes.
15. any described feedforward linear power amplification control method in 14 is characterized in that described step (1), step (2) or step (3) self circulates repeatedly, till the signal of described power-sensing circuit no longer diminishes according to Claim 8.
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| CN200710093925A CN100589320C (en) | 2007-07-05 | 2007-07-05 | Feedforward linear power amplifying circuit and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102545795A (en) * | 2011-12-30 | 2012-07-04 | 武汉虹信通信技术有限责任公司 | Feed-forward power amplifier on basis of current detection self-adaption method |
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| CN103018696A (en) * | 2011-09-28 | 2013-04-03 | 南京丹迪克科技开发有限公司 | Three-phase power harmonic standard source |
| CN102801391B (en) * | 2012-08-10 | 2014-09-03 | 昆山美博通讯科技有限公司 | Modular feedforward power amplifier |
| CN103219948B (en) * | 2013-03-14 | 2015-12-16 | 武汉正维电子技术有限公司 | There is the high efficiency power amplifier of error signal compensation function |
| CN103840776B (en) * | 2013-05-06 | 2016-08-03 | 电子科技大学 | A kind of device improving the feed-forward amplifier linearity |
| CN103986426A (en) * | 2014-05-07 | 2014-08-13 | 京信通信***（中国）有限公司 | Power amplifier, loop control method and loop control device in power amplifier |
| CN107579716B (en) * | 2017-09-19 | 2020-08-07 | 中国人民解放军海军工程大学 | Linear power amplifier based on analog cancellation |
| CN108390651B (en) * | 2018-02-09 | 2021-07-06 | 沃勤科技有限公司 | Radio frequency power amplifier and cancellation method for self-adaptive feedback cancellation distortion signal |
| CN109302155B (en) * | 2018-09-12 | 2022-06-21 | 博流智能科技（南京）有限公司 | Feedforward amplitude linearization method and circuit of deep AB type power amplifier |
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2007
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545795A (en) * | 2011-12-30 | 2012-07-04 | 武汉虹信通信技术有限责任公司 | Feed-forward power amplifier on basis of current detection self-adaption method |
| CN102545795B (en) * | 2011-12-30 | 2015-04-22 | 武汉虹信通信技术有限责任公司 | Feed-forward power amplifier on basis of current detection self-adaption method |
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