CN100521512C - RF fundamental neutralizing circuit of adapting to power - Google Patents
RF fundamental neutralizing circuit of adapting to power Download PDFInfo
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- CN100521512C CN100521512C CNB2006100216995A CN200610021699A CN100521512C CN 100521512 C CN100521512 C CN 100521512C CN B2006100216995 A CNB2006100216995 A CN B2006100216995A CN 200610021699 A CN200610021699 A CN 200610021699A CN 100521512 C CN100521512 C CN 100521512C
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- electric bridge
- fundamental
- adjustable attenuator
- attenuator
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Abstract
This invention discloses a RF fundamental counteract circuit adapting to power including adjustable attenuators 11 and 12, coupler 14, detector 15 and a compensation control circuit 16, in which, one end of the adjustable attenuator 11 is connected with the RF signal end, the other end is connected with the coupler with two output ends, one is orderly serial to the detector, the compensation control circuit and the adjustable attenuator in fundamental counteract circuit, the other end is connected with port A1 of bridge 1 of the counteract circuit, port D5 of the bridge 5 is connected to 12 as the output end of RF signal.
Description
Technical field
The present invention relates to a kind of RF fundamental neutralizing circuit, be specifically related to a kind of fundamental neutralizing circuit power adaptive.
Background technology
RF (radio frequency) fundamental neutralizing circuit is mainly used in RF linear power amplifier (abbreviation power amplifier), and in the RF Linear Power Amplifier, the method for power amplifier linearization has: back-off method, pre-distortion method, feed forward approach, feedback transmitter etc.Wherein pre-distortion method and feed forward approach all need a RF fundamental neutralizing circuit, adopt from main road of existing RF first-harmonic cancellation technology taken out a signal more, through time-delay, synthetic with the signal by distortion generator on the main road, when the signal amplitude after main path signal and the time-delay equates and just can make fundametal compoment obtain offsetting during 180 ° of phasic differences mutually, thereby only kept distortion component.Existing fundamental neutralizing circuit exist circuit complexity, debugging trouble, neutralization effect poor, to power can not self adaptation, three rank and five rank intermodulation components shortcoming such as can not take into account.
Summary of the invention
Technical problem to be solved by this invention is how a kind of RF fundamental neutralizing circuit to power adaptive is provided, this circuit has guaranteed the effect that first-harmonic is offset, greatly reduce the debugging amount, can be used in the pre-distortion power amplifier, can improve the linear index of power amplifier, can improve the efficient of power amplifier, input power is had adaptive capacity preferably, three rank and five rank intermodulation components can be taken into account preferably.
Technical problem proposed by the invention is to solve like this: construct a kind of RF fundamental neutralizing circuit to power adaptive, comprise the 3rd adjustable attenuator 11, the 4th adjustable attenuator 12 and fundamental neutralizing circuit, it is characterized in that, also include coupler 14, wave detector 15 and compensation control circuit 16; Described the 3rd adjustable attenuator 11 1 ends connect the RF signal end, the other end connects coupler 14, described coupler 14 is provided with two outputs, second adjustable attenuator 9 in port wave detector 15 in sequential series, compensation control circuit 16 and the described fundamental neutralizing circuit, the another port connects the first port A of first electric bridge 1 of fundamental neutralizing circuit
1The 8th port D of second electric bridge 5
5Connect the output of the 4th adjustable attenuator 12 as the RF signal.
According to the RF fundamental neutralizing circuit to power adaptive provided by the present invention, it is characterized in that the 8th port D of second electric bridge 5
5With also can be connected amplifier 17 between the 4th adjustable attenuator 12; Or at the back of the 4th adjustable attenuator 12 connection amplifier 17, the output of amplifier 17 is as the output of this circuit.
According to the RF fundamental neutralizing circuit to power adaptive provided by the present invention, it is characterized in that described fundamental neutralizing circuit comprises first electric bridge 1, second electric bridge 5, first fixed attenuator 3, second fixed attenuator 7, first distortion generator 2, second distortion generator 8, first adjustable attenuator 4 and second adjustable attenuator 9 and first load 6 and second load 10; The first port A of described first electric bridge 1
1The 7th port C with second electric bridge 5
5Connect first load 6 and second load, 10 back ground connection respectively; The 4th port D of first electric bridge 1
1 First distortion generator 2 in sequential series, first fixed attenuator 3, first adjustable attenuator, 4 backs connect the five-port A of second electric bridge 5
5, the 3rd port C of first electric bridge 1
1Second fixed attenuator 7 in sequential series, second distortion generator 8, second adjustable attenuator, 9 backs connect the 6th port B of second electric bridge 5
5
According to the RF fundamental neutralizing circuit to power adaptive provided by the present invention, it is characterized in that described fundamental neutralizing circuit comprises first electric bridge 1 and second electric bridge 5, first fixed attenuator 3 and second fixed attenuator 7, first distortion generator 2 and second distortion generator 8, first adjustable attenuator 4 and second adjustable attenuator 9 and first load 6 and second load 10; The first port A of described first electric bridge 1
1The 7th port C with second electric bridge 5
5Connect first load 6, second load, 10 back ground connection respectively; The 4th port D of first electric bridge 1
1Second fixed attenuator 7 in sequential series, second distortion generator 8, second adjustable attenuator, 9 backs connect the five-port A of second electric bridge 5
5, the 3rd port C of first electric bridge 1
1 First distortion generator 2 in sequential series, first fixed attenuator 3, first adjustable attenuator, 4 backs connect the 6th port B of second electric bridge 5
5
According to the RF fundamental neutralizing circuit to power adaptive provided by the present invention, it is characterized in that described coupler 14 connects coupling the 3rd load 13 back ground connection.
RF fundamental neutralizing circuit to power adaptive provided by the present invention, signal is from 11 inputs of the 3rd adjustable attenuator, deliver to fundamental neutralizing circuit through coupler 14, obtain three rank and five rank signals after first-harmonic is cancelled and output to amplifier 17 amplifications, then output after 12 decay of the 4th adjustable attenuator.From the signal of the coupled end of coupler 14 output through wave detector 15 detections, obtained a direct voltage relevant with the power output of the 3rd adjustable attenuator 11, behind compensation control circuit 16, remove to control second adjustable attenuator 9, make this fundamental neutralizing circuit can adapt to the variation of input power automatically, after input power changes or adjusted the 3rd adjustable attenuator 11, the output voltage of wave detector 15 is changed, behind compensation control circuit 16, remove to control second adjustable attenuator 9 in the delay circuit, this fundamental neutralizing circuit can be adapted to automatically to power, within the specific limits, the variation of input power and adjust the 3rd adjustable attenuator 11 and can obtain better more stable first-harmonic neutralization effect.The 3rd load 13 is matched loads of coupler 14.Add that at input and output the 3rd adjustable attenuator 11 and the 4th adjustable attenuator 12 can adjust the amplitude of output three order components and five order components flexibly.
Description of drawings
Fig. 1 is the circuit diagram of first embodiment of the RF fundamental neutralizing circuit to power adaptive provided by the present invention;
Fig. 2 is the third order intermodulation and the five rank intermodulation schematic diagrames of the RF fundamental neutralizing circuit to power adaptive provided by the present invention;
Fig. 3 is that the input signal of the RF fundamental neutralizing circuit to power adaptive provided by the present invention is with the output first-harmonic and export three order components and the graph of a relation of five order components;
Fig. 4 is the circuit diagram of second embodiment of the RF fundamental neutralizing circuit to power adaptive provided by the present invention.
Among the figure: 1. first electric bridge; 2. first distortion generator; 3. first fixed attenuator; 4. first adjustable attenuator; 5. second electric bridge; 6. first load; 7. second fixed attenuator; 8. second distortion generator; 9. second adjustable attenuator; 10. second load; 11. the 3rd adjustable attenuator; 12. the 4th adjustable attenuator; 13. the 3rd load; 14. coupler; 15. wave detector; 16. compensation control circuit; 17. amplifier.
Embodiment
Below in conjunction with accompanying drawing the RF fundamental neutralizing circuit to power adaptive provided by the present invention is elaborated.
Fig. 1 is the circuit diagram of first embodiment of the RF fundamental neutralizing circuit to power adaptive provided by the present invention, and Fig. 4 is the circuit diagram of second embodiment of the RF fundamental neutralizing circuit to power adaptive provided by the present invention.The 3rd adjustable attenuator 11 1 ends connect the RF signal end, the other end connects coupler 14, coupler 14 is provided with two outputs, second adjustable attenuator 9 in port wave detector 15 in sequential series, compensation control circuit 16 and the fundamental neutralizing circuit, the another port connects the first port A of first electric bridge 1 of fundamental neutralizing circuit
1Amplifier 17 1 ends connect the 8th port D of second electric bridge 5 of fundamental neutralizing circuit
5, the other end connects the output of the 4th adjustable attenuator 12 as the RF signal, the second port B of first electric bridge 1 in the fundamental neutralizing circuit among first embodiment
1The 7th port C with second electric bridge 5
5Connect first load 6 and second load, 10 back ground connection respectively, the 4th port D of first electric bridge 1
1First distortion generator 2 in sequential series, first fixed attenuator 3 and first adjustable attenuator, 4 backs are connected the five-port A of second electric bridge 5
5, the 3rd port C1 of first electric bridge 1 second fixed attenuator 7 in sequential series, second distortion generator 8 and second adjustable attenuator, 9 backs are connected the 6th port B of second electric bridge 5
5The second port B of first electric bridge 1 of first-harmonic circuit among second embodiment
1The 7th port C with second electric bridge 5
5Connect first load 6 and second load, 10 back ground connection respectively; The 4th port D of first electric bridge 1
1Second fixed attenuator 7 in sequential series, second distortion generator 8 and second adjustable attenuator, 9 backs are connected the five-port A of second electric bridge 5
5, the 3rd port C of first electric bridge 1
1First distortion generator 2 in sequential series, first fixed attenuator 3 and first adjustable attenuator, 4 backs are connected the 6th port B of second electric bridge 5
5
The theory relation of each port of electric bridge sees the following form:
Fig. 2 is the third order intermodulation schematic diagram of RF fundamental neutralizing circuit provided by the present invention, and concerning a nonlinear device, three order components of its output and five order components sharply increase with the increase of input signal.Third order intermodulation rejection ratio (IMD3, be called for short third order intermodulation): refer to the decibel value of the power ratio of the fundametal compoment of amplifier output signal and third order intermodulation component, represent, see Fig. 2 with IMD3.Wherein, F1 and F2 are that two power of input equate and the output component of the different signals of frequency after amplifying by amplifier that for ideal amplifier, its output should only comprise F1 and F2.But actual amplifier is owing to exist distortion, and its output just not only only comprises F1 and F2, but has comprised numerous new frequency components.To systematic influence bigger mainly contain F3, F4, F5, F6 etc.Wherein, F3=2*F1-F2, F4=2*F2-F1.F5＝3*F1-2*F2，F6＝3*F2-2*F1。They all are because device non-linear, make F1 and F2 produce in the process of amplifying that various combination of frequencies (being called intermodulation again) form.F3 and F4 just are called as the third order intermodulation component, and F5 and F6 just are called as five rank intermodulation components.
Fig. 3 is the input signal and the output first-harmonic of RF fundamental neutralizing circuit provided by the present invention and exports three order components and five order component graphs of a relation.Curve A is represented the variation relation of the power output of fundamental signal with input power, and its slope is 1.It and ordinate have an intersection point, the value of power output, just Amplifier Gain G when input power is 0dBm when being illustrated in input power and being 0dBm; Curve B is represented the variation relation of three order components with input power, and its slope is 3; Curve C is represented the theoretic extension of the linearity range of curve A fundamental signal, and the extension curve of it and three order components has an intersection point, and this intersection point is called third order intermodulation cut-off point (OIP3).Curve D represents that five order components are with the variation relation of input power in the output signal, and its slope is 5.The extension curve of curve C and five order components has an intersection point, and this intersection point can be called five rank intermodulation cut-off points (OIP5).The IMD3 of this amplifier has following formula when power output is P0:
IMD3＝P0-IM3＝(OIP3-P0)*2
IM3＝3*P0-2*OIP3
As can be seen from Figure 3, when input power increased 1dB, the corresponding increase of the fundamental power of output 1dB exported three order components and then increases 3dB, and output IMD3 then reduces 2dB; Export five order components and then increase 5dB, output IMD5 then reduces 4dB.
For a concrete power amplifier, the distortion situation on its three rank and five rank has nothing in common with each other, suitable such as the three order component power of exporting when predistortion circuit, and five order component power are when not enough, then three order components of power amplifier output can better be offset, and five order component neutralization effect differences are a little, and then the linearisation effect of power amplifier output is just not so good.At this moment can adjust the 3rd adjustable attenuator 11, reduce attenuation, input power is increased, three rank and the five order component power of output are all increased simultaneously: three order component power increase 3 times, and five order component power increase 5 times, adjust the 4th adjustable attenuator 12 then, make three rank of output obtain identical attenuation with five rank power.By such adjustment, the power of three rank and five order components can both be complementary with the distortion situation of power amplifier, improve effect thereby reach best linearity.Other three rank and five rank power mismatch situations also are to adjust according to same principle.
This shows, adjust power by suitable adjustment the 3rd adjustable attenuator 11, can adjust the amplitude on three rank and five rank neatly, can make itself and power amplifier reach the optimum Match state, linearisation improves best results.
Claims (3)
1, a kind of RF fundamental neutralizing circuit to power adaptive comprises the 3rd adjustable attenuator (11), the 4th adjustable attenuator (12) and fundamental neutralizing circuit, it is characterized in that, also includes coupler (14), wave detector (15) and compensation control circuit (16); Described fundamental neutralizing circuit comprises first electric bridge (1), second electric bridge (5), first fixed attenuator (3), second fixed attenuator (7), first distortion generator (2), second distortion generator (8), first adjustable attenuator (4), second adjustable attenuator (9), first load (6) and second load (10); Described the 3rd adjustable attenuator (11) one ends connect the RF signal end, the other end connects coupler (14), described coupler (14) is provided with two outputs, second adjustable attenuator (9) in a port wave detector in sequential series (15), compensation control circuit (16) and the described fundamental neutralizing circuit, the another port connects the first port (A of first electric bridge (1) of fundamental neutralizing circuit
1); The 8th port (D of second electric bridge (5)
5) connect the output of the 4th adjustable attenuator (12) as the RF signal; The fundamental neutralizing circuit annexation is a kind of in following two kinds of connected modes:
Second port (the B of 1. described first electric bridge (1)
1) and the 7th port (C of second electric bridge (5)
5) connect first load (6) and second load (10) back ground connection respectively; The 4th port (D of first electric bridge (1)
1) first distortion generator in sequential series (2), first fixed attenuator (3) and first adjustable attenuator (4) back be connected the five-port (A of second electric bridge (5)
5), the 3rd port (C of first electric bridge (1)
1) second fixed attenuator in sequential series (7), second distortion generator (8) and second adjustable attenuator (9) back be connected the 6th port (B of second electric bridge (5)
5).
Second port (the B of 2. described first electric bridge (1)
1) be connected first load (6) and second load (10) back ground connection respectively with the 7th port (C5) of second electric bridge (5); The 4th port (D of first electric bridge (1)
1) second fixed attenuator in sequential series (7), second distortion generator (8) and second adjustable attenuator (9) back be connected the five-port (A of second electric bridge (5)
5), the 3rd port (C of first electric bridge (1)
1) first distortion generator in sequential series (2), first fixed attenuator (3) and first adjustable attenuator (4) back be connected the 6th port (B of second electric bridge (5)
5).
2, the RF fundamental neutralizing circuit to power adaptive according to claim 1 is characterized in that, the 8th port (D of second electric bridge (5)
5) with the 4th adjustable attenuator (12) between also can be connected amplifier (17); Or at the back of the 4th adjustable attenuator (12) connection amplifier (17), the output of amplifier (17) is as the output of this circuit.
According to claim 1 or the described RF fundamental neutralizing circuit of claim 2, it is characterized in that 3, described coupler (14) connects coupling the 3rd load (13) back ground connection to power adaptive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100216995A CN100521512C (en) | 2006-08-29 | 2006-08-29 | RF fundamental neutralizing circuit of adapting to power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100216995A CN100521512C (en) | 2006-08-29 | 2006-08-29 | RF fundamental neutralizing circuit of adapting to power |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1913343A CN1913343A (en) | 2007-02-14 |
| CN100521512C true CN100521512C (en) | 2009-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100216995A Expired - Fee Related CN100521512C (en) | 2006-08-29 | 2006-08-29 | RF fundamental neutralizing circuit of adapting to power |
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| CN (1) | CN100521512C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100525087C (en) * | 2007-02-16 | 2009-08-05 | 上海杰盛无线通讯设备有限公司 | Balance power amplifier based on 90 degree branch mixed electrical bridge |
| CN101286962B (en) * | 2008-05-30 | 2010-10-06 | 北京北方烽火科技有限公司 | Carrier balancing radio frequency predistortion power amplifier realizing apparatus and method |
| EP2161832B1 (en) * | 2008-09-09 | 2011-04-20 | Alcatel Lucent | Power amplifier linearization using RF feedback |
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| CN1913343A (en) | 2007-02-14 |
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Granted publication date: 20090729 Termination date: 20110829 |