CN102647373A - Method and device for correcting unmatching of same phase/orthogonal signals in communication circuit - Google Patents
Method and device for correcting unmatching of same phase/orthogonal signals in communication circuit Download PDFInfo
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- CN102647373A CN102647373A CN201110041045XA CN201110041045A CN102647373A CN 102647373 A CN102647373 A CN 102647373A CN 201110041045X A CN201110041045X A CN 201110041045XA CN 201110041045 A CN201110041045 A CN 201110041045A CN 102647373 A CN102647373 A CN 102647373A
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Abstract
The invention provides a method and device for correcting the unmatching of same phase/orthogonal signals in a communication circuit, which relate to a method and a relevant device for correcting the unmatching between the same phase/orthogonal signals between the communication circuits in the communication circuit. The same phase test signal and the orthogonal test signal with different frequency contents are utilized to correct the unmatching of the signals of the relevant frequency in the communication circuit.
Description
Technical field
The present invention relates to radio communication, refer to be used for a direct up-conversion reflector (direct up-conversion transmitter) especially and proofread and correct wherein in-phase signal and unmatched method and the relevant apparatus between orthogonal signalling.
Background technology
In wireless communication technology, telecommunication circuit (as: reflector or receiver) is to be used for desire information transmitted and carrier modulation, and utilizes antenna to transmit, or will receive and the signal that comes carries out demodulation from antenna, to read information wherein.Traditional reflector includes the different framework of many kinds, and wherein a kind of common framework is to be direct up-conversion reflector (direct up-conversion transmitter).Simple functions block schematic diagram about this reflector please refer to Fig. 1.As shown in the figure; Directly up-conversion reflector 100 has an in-phase path 110 (In-phase channel) and a quadrature phase path 120 (Quadrature channel), wherein comprises digital to analog converter 111 and 121, low pass filter 112 and 122, frequency mixer 113 and 123, an adder 130, a power amplifier 140 and an antenna 150 again respectively.In in-phase path 110, a digital baseband in-phase signal BBIt can be input to after digital to analog converter 111 carries out conversion process, is input to low pass filter 112 again and carries out Filtering Processing.At last, carry out mixing, to produce a simulation high frequency in-phase signal AnIt through a frequency mixer 113 and a same-phase local oscillated signal LOIt.Likewise, in quadrature phase path 120, a digital baseband orthogonal signalling BBQt also can handle through similar, and carries out mixing through a frequency mixer 123 and a quadrature phase local oscillated signal LOQt, and then produces a simulation high frequency orthogonal signalling AnQt.Then, through adder 130, power amplifier 140 and antenna 150 will be simulated high frequency in-phase signal AnIt and high frequency orthogonal signalling AnQt carries out addition, and signal amplifies, with transmission.
Therefore the framework of this direct up-conversion is used in the various radio communication devices owing to have plurality of advantages such as with low cost, that power consumption is less and circuit area is less widely.Yet its shortcoming is unfavorable high frequency characteristics, reason maybe for the inphase/orthogonal path not the matching of analog end, and this not matching comprises; Gain between in-phase signal and the orthogonal signalling does not match, phase place does not match or path (time of delay) does not match.And in single carrier modulation system; Gain between in-phase signal and orthogonal signalling does not match and will cause having in the planisphere obviously visible distortion (as being the planisphere of foursquare 64-QAM originally; To cause transmission distortion because of not matching, last planisphere may become rectangle).Moreover; The image frequency that not matching between in-phase signal and orthogonal signalling more can be caused non-expection property is disturbed (image interference); Thereby have a strong impact on the signal to noise ratio (snr) that system can reach; (error vector magnitude is EVM) with the error rate (bit error rate, lifting BER) further to cause loss and the error vector magnitude of information.
And in the technical field under the present invention, also have multiple correlation technique in order to address the above problem.For example, patent application (application number 20020015450) just proposes a kind of usefulness and decides the phase place of revising the inphase/orthogonal modulator in the reflector method and apparatus with the unmatched correlation-corrected parameter of amplitude that do not match.Include one a homophase/quadrature modulator and an adjuster in the reflector of this case, this adjuster is used for proofreading and correct that the phase place that is caused because of the inphase/orthogonal modulator does not match and amplitude does not match.Moreover; This case is to the defeated inphase/orthogonal test signals samples of institute's tendency to develop; And then signal sampling carried out analog/digital conversion; And transfer to produce homophase and quadrature feedback signal to separate, and do not match based on the amplitude that is determined and phase place and to produce amplitude and phasing parameter signal sampling is capable.Another kind of technology then utilizes an envelope detector (envelope detector) to detect the output of conveyer and utilize circuit to amplify detected envelope.And for homophase and orthogonal signalling, the envelope detector of high frequency can be with frequency F
BBThe frequency spectrum composition (causing) and the frequency 2xF at place based on carrier wave
BBThe frequency spectrum composition at place (causing) based on the inphase/orthogonal institute that do not match produce after the filtering with amplification after the fundamental frequency ripple.And the control information of amplitude and phase place can be used to destroy in advance modulation back signal.
Yet the greatest problem of these correlation techniques is that it does not only match to amplitude and phase place and proofreaies and correct, and these are by the frequency-independent of not matching of being caused of frequency mixer (113 and 123) and local oscillated signal (LOIt and LOQt) with fundamental frequency signal.Even if after the unmatched correction of amplitude and phase place was accomplished, often still there was the undesirable property of high frequency in telecommunication circuit 100, this is because the correcting mode in the correlation technique has been ignored and not the matching of frequency dependence but in fact.Therefore, when fundamental frequency signal change frequency of importing or the communication system that is applied to broad frequency band, homophase in the telecommunication circuit 100 and quadrature path mismatch problem will appear in one's mind again once more.Not matching of this and frequency dependence, maybe for the analog converter in the different paths 111 and 121 and low pass filter 112 and 122 between circuit characteristic difference, do not match the time of delay that is caused.But, do not have correlation technique to solve this problem yet in the field under the present invention.
Summary of the invention
The objective of the invention is to solve the frequency dependence mismatch problem between the inphase/orthogonal phase path.In addition, in different embodiments of the invention, the test signal that utilization is included more than one frequency content not proofread and correct matching.
The method that one of the present invention embodiment provides in-phase signal and the orthogonal signalling in a kind of correction one telecommunication circuit not match (I/Q mismatch).This method comprises: one first test signal and one second test signal that include corresponding to the composition of a first frequency are provided, and be an in-phase signal one of in this first, second test signal wherein, and another are orthogonal signalling; Proofread and correct this first test signal according to present first correction parameter, to produce one first adjustment back test signal, wherein this present first correction parameter is corresponding to time of delay; And carry out the adjustment of one first correction parameter and operate; Wherein this first correction parameter adjustment operation comprises again: provide one first to add and signal; This first adds one first quadrature that produced through the one first homophase analog signal that will be produced according to this first adjustment back test signal respectively and according to this second test signal with signal analog signal mutually; Carry out a mixing operation with a same-phase local oscillated signal and a quadrature phase local oscillated signal respectively, and the result of this mixing operation of addition produces; This first is added with signal and carry out a self-mixing (self-mixing) operation to produce one first measured signal; And upgrade this present first correction parameter in pairing one first performance number of one first CF according to this first measured signal.Wherein, when one first specified conditions reach, finish this first correction parameter adjustment operation; Otherwise, repeat this first correction parameter adjustment operation
One embodiment of the invention provide (the In-phase/Quadrature phase mismatch that do not match of in-phase signal and the orthogonal signalling in a kind of correction one telecommunication circuit; I/Q mismatch) device; This device provides and includes corresponding to one first test signal of the composition of a first frequency and one second test signal to this telecommunication circuit; Be an in-phase signal one of in this first, second test signal wherein, and another is orthogonal signalling.This device comprises; One correcting unit, a detecting unit and a correction parameter adjustment unit.This correcting unit receives this first test signal and this second test signal respectively; And in order to proofread and correct this first test signal according to present first correction parameter; To produce one first adjustment back test signal, wherein this present first correction parameter is corresponding to time of delay.This detecting unit carries out self-mixing operation to produce one first measured signal in order to add with signal one first; And in order to calculate this first measured signal in pairing one first performance number of one first CF; Wherein this first adds one first analog signal (the first homophase analog signal Ana_I1) and one second analog signal (first quadrature is analog signal Ana_Q1 mutually) that will be produced according to this first, second adjustment back test signal through frequency mixer respectively by this telecommunication circuit with signal; Carry out mixing with a first carrier (same-phase local oscillated signal LoIt) and one second carrier wave (quadrature phase local oscillated signal LoQt), and produce through the result of this mixing of adder addition.This correction parameter adjustment unit is coupled to this correcting unit and this detecting unit, and in order to carry out one first correction parameter adjustment operation according to this first performance number to upgrade this present first correction parameter.Wherein, when one first specified conditions reached, this correction parameter adjustment unit finished to carry out this first correction parameter adjustment operation; Otherwise this correction parameter adjustment unit repeats this first correction parameter adjustment operation.
Description of drawings
Fig. 1 illustrates the reflector of the direct up-conversion framework of convention.
Fig. 2 illustrates the function block schematic diagram of an embodiment of apparatus of the present invention.
Fig. 3 illustrates the function block schematic diagram of another embodiment of apparatus of the present invention.
Fig. 4 illustrates the schematic flow sheet of an embodiment of the inventive method.
Fig. 5 illustrates in the inventive method the schematic flow sheet of adjusting this present first correction parameter according to this first performance number.
Fig. 6 illustrates the schematic flow sheet of another embodiment of the inventive method.
Fig. 7 illustrates the frequency spectrum of a signal specific.
Fig. 8 illustrates the frequency spectrum of another signal specific.
Fig. 9 A and Fig. 9 B illustrate the graph of a relation of image-frequency rejection ratio and frequency.
The primary clustering symbol description
100 reflectors
110,120 paths
111,121,241,242 digital to analog converters
112,122,223,243,244, low pass filter
113,123,221,245,246 frequency mixers
130,247,333 adders
140 power amplifiers
222 variable gain amplifiers
150 antennas
20 devices
210,310 correcting units
220 detecting units
230 correction parameter adjustment units
211,311,312 correcting circuits
224 analog-to-digital converters
225 fast fourier transform unit
240 telecommunication circuits
410～460,510～550,610～650 steps
Embodiment
In the middle of specification and follow-up claims, used some vocabulary to censure specific assembly.Those of ordinary skill should be understood in the affiliated field, and hardware manufacturer may be called same assembly with different nouns.This specification and follow-up claims are not used as distinguishing the mode of assembly with the difference of title, but the criterion that is used as distinguishing with the difference of assembly on function.Be an open term mentioned " comprising " in the middle of specification and the follow-up claim in the whole text, so should be construed to " comprise but be not limited to ".
In addition, " couple " speech and comprise any indirect means that are electrically connected that directly reach at this.Therefore, be coupled to one second device, then represent this first device can directly be electrically connected in this second device, or be electrically connected to this second device through other device or the intersegmental ground connection of connection hand if describe one first device in the literary composition.
Moreover notion of the present invention will describe in hereinafter arrange in pairs or groups different embodiment and relevant indicators.On behalf of it, the assembly or the device that wherein, in the difference diagram, have same numeral similar operating principle and technological effect are arranged.So, below in literary composition will omit repeatability narration.In addition, the different technologies characteristic that is possessed among the different embodiment in the literary composition is not only can be implemented among this embodiment.In fact, in reasonable category of the present invention, can be through suitable modification, so that it possesses the peculiar technical characterictic of other embodiment to certain specific embodiment.
At first, below with the principle of introducing correction of the present invention earlier.Please again with reference to figure 1; As previously mentioned; Because 120 digital to analog converter 112 and the property difference of low pass filter 114 because of circuit unit can cause input signal is produced different delays in the digital to analog converter 111 in the in-phase path 110 and low pass filter 112 and the quadrature phase path.If with fundamental frequency in-phase signal BBIt is cos (ω
mT) and fundamental frequency orthogonal signalling BBQt be sin (ω
mT) (wherein, ω
m=2 π f
m) be example, it is cos (ω that the different delay in then this path can cause the signal change of being exported by low pass filter 112 and low pass filter 114
mAnd sin (ω (t+t0))
mT), it is different that wherein t0 represents two path delay-time difference, through with frequencies omega
mMultiply each other, so in-phase signal BBIt=cos (ω
m(t+t0)) with orthogonal signalling BBQt=sin (ω
mT), can there be (phase place) the factor ω that do not match between two signals by caused time of delay
m* t
0, and this one does not match and is proportional to the frequencies omega of fundamental frequency signal
m
At this moment, if consider the property difference between frequency mixer 113 and 123 in the lump, and a same-phase local oscillated signal LoIt and a quadrature phase local oscillated signal LoQt are set at (1+g) respectively
With sin (ω
LOT) (wherein g,
Represent that respectively amplitude does not match between in-phase path 110 and the quadrature phase path 120, phase place does not match), then the analog radio-frequency signal exported of the adder 130 in the telecommunication circuit 100 can be expressed as
Thus, can get the image-frequency rejection ratio that telecommunication circuit 100 produced (image rejection ration IMR) is:
Image-frequency rejection ratio is meant that in frequency be f
LO-f
mThe average power of image signal at place, than last be f in frequency
LO+ f
mThe average power of the main up-conversion signal at place.Can be known that by following formula the degree of not matching between the inphase/orthogonal path can influence the being seen image-frequency rejection ratio of telecommunication circuit 100 outputs, image-frequency rejection ratio is more little, and the matching degree between the expression inphase/orthogonal path is high more.Therefore, can be according to the index of image-frequency rejection ratio as the inphase/orthogonal route matching degree of assessing signal.And can know by following formula, the power of image frequency signal do not match with the gain that frequency mixer and local oscillated signal caused, the phase place in inphase/orthogonal two paths and difference time of delay that digital to analog converter and low pass filter caused in inphase/orthogonal two paths relevant.Therefore, notion of the present invention is not match the time of delay of proofreading and correct earlier with frequency dependence, and gain, the phase place of correction and frequency-independent do not match again afterwards.Wherein, unmatched degree reaches through the watt level of observing two times of fundamental frequency signals that are associated with image frequency signal.
Please refer to Fig. 2, it is the function block schematic diagram of first embodiment of apparatus of the present invention.Apparatus of the present invention 20 include a correcting unit 210, one detecting units 220 and a correction parameter adjustment unit 230.Wherein, apparatus of the present invention 20 are in order to proofread and correct a telecommunication circuit 240.Telecommunication circuit 240 includes the digital to analog converter 241 and 242 that belongs to in-phase path and quadrature path respectively; Low pass filter 243 and 244, frequency mixer 245 and 246; Homophase local oscillated signal LoIt and quadrature be local oscillated signal LoQt mutually, and an adder 247.At the beginning of proofreading and correct, correcting unit 210 can receive fundamental frequency homophase test signal BBIt and fundamental frequency orthogonal test signals BBQt earlier, and wherein homophase test signal BBIt and orthogonal test signals BBQt include the ingredient f of a first frequency
m, (as: BBIt=cos (2 π f
mT), BBQt=sin (2 π f
mT)); And the preset value that is provided according to correction adjustment parameter unit 230 is used as one first initial present correction parameter Para_1; Setting first correcting circuit 211 (carrying out unmatched correction time of delay), and then homophase test signal BBIt is proofreaied and correct in advance.Should be noted that; Because not matching between the inphase/orthogonal path is the right notion of symbolic animal of the birth year, therefore, in other embodiment of the present invention; First correcting circuit 211 also capable of using comes pair of orthogonal test signal BBQt to proofread and correct, to eliminate not matching between the inphase/orthogonal path.
Then, apparatus of the present invention 20 can adjust repeatedly the first present correction parameter Para_1 through following operation, to obtain a correcting result.So-called best adjustment effect be meant through first correcting circuit 211 make image-frequency rejection ratio (IMR) to the graph of a relation of frequency can by Fig. 9 B (that is; Image-frequency rejection ratio is proportional to the frequency of signal) be transformed into Fig. 9 A (that is the frequency of image-frequency rejection ratio and signal is uncorrelated).After first correcting circuit 211 was proofreaied and correct homophase test signal BBIt according to present first correction parameter, the correcting unit 210 meeting adjusted homophase test signal BBIt ' of output and not controlled orthogonal test signals BBQt were to telecommunication circuit 240.Afterwards, these two signals can be input to analog converter 241 and 242 and low pass filter 243 and 244 respectively, and then produce one first homophase analog signal Ana_I1 and one first quadrature analog signal Ana_Q1 mutually respectively.Wherein, when having reached an optimum value as if the present first correction parameter Para_1, then there be not matching of time of delay in the first homophase analog signal Ana_I1 mutually with first quadrature between the analog signal Ana_Q1, and image-frequency rejection ratio will be shown in Fig. 9 A to the relation of frequency.
The first homophase analog signal Ana_I1 and first quadrature analog signal Ana_Q1 mutually are sent to frequency mixer 245,246 respectively; Carry out mixing with a same-phase local oscillated signal LoIt, a quadrature phase local oscillated signal LoQt; And, produce one first with result and add and signal S1 according to mixing through adder 247.The main purpose of detecting unit 220 be to detect telecommunication circuit 240 exports first add with signal S1 in the pairing power of image frequency composition (target of actual observation is the watt level of two times of fundamental frequency signals being associated with the image frequency watt level).Therefore, the output signal of detecting unit 220 meeting observation telecommunication circuits 240 is through the frequency spectrum after the self-mixing.Please refer to Fig. 7 top, in theory, first of telecommunication circuit 240 outputs add with its frequency spectrum of signal S1 in image frequency composition B be positioned at and be frequency (f
Lo-f
m) locate, so detecting unit 220 ought to be observed frequency spectrum in pairing performance number here.And enough hour of the power ought be here representes that then the unmatched situation of inphase/orthogonal path signal is suitably proofreaied and correct.Yet, because the frequency here is high frequency f
Lo, the power of frequency spectrum composition that therefore will calculate this place is not easy.Carry out self-mixing (multiplying each other with self) with signal S1 and produce one first measured signal S1 ' so detecting unit of the present invention 220 adds through 221 pairs first in frequency mixer earlier, wherein, the frequency spectrum of the first measured signal S1 ' can be with reference to below among the figure 7.Since with self multiplied result, will be at frequency 2f
mThe place produces a corresponding frequency spectrum composition A*B.Main up-conversion signal (the f of A value representation wherein
LO+ f
m) the frequency spectrum composition, B is image frequency signal (f
LO-f
m) the frequency spectrum composition, setting the A value is a unit-sized, then at frequency 2f
mIt in the frequency spectrum composition equivalence at place the frequency spectrum composition size of image frequency signal.Because frequency 2f
mThan frequency (f
Lo-f
m) obviously lower (f
mBe fundamental frequency, f
LoBe the rf frequencies of hundreds of MHz to number GHz), it is more or less freely that therefore place's power is somebody's turn to do in calculating.So the present invention utilizes the observation first measured signal S1 ' variable power herein to adjust the first present parameter Para_1, and just is the frequency of oscillation f of fundamental frequency homophase test signal BBIt and fundamental frequency orthogonal test signals BBQt here
mTwice.So the present invention can calculate first measured signal at frequency 2f
mOne first performance number that the place is corresponding.
In order to calculate this first performance number; Detecting unit 220 inputs to low pass filter 223 after the first measured signal S1 ' is amplified through variable gain amplifier 222 again; Radio-frequency component among this measure filtering first measured signal S1 ' keeps wherein low-frequency component (like respective frequencies 2f
mComposition).Afterwards, obtain this first performance number through analog-to-digital converter 224 and fast fourier transform unit 225.Correction parameter adjustment unit 230 can receive this first performance number that detecting unit 220 calculates, and carries out one first correction parameter adjustment operation according to this first performance number.Wherein, correction parameter adjustment unit 230 can upgrade this present first correction parameter in each operation, and when one first specified conditions reach, finishes to carry out this first correction parameter adjustment operation; Otherwise, repeat this first correction parameter adjustment operation.
Wherein these specified conditions maybe be corresponding to the size of carrying out number of times or this first performance number of first correction parameter adjustment operation.For instance,, then quite possibly reach the correcting result of a satisfaction, so correction parameter adjustment unit 230 finishes to carry out this first correction parameter adjustment operation if after first correction parameter adjustment operation has been carried out quite repeatedly.Or first performance number then also possibly proofreaied and correct with matching of frequency dependence between the inphase/orthogonal path during less than a predetermined value validly, operates so correction parameter adjustment unit 230 also finishes to carry out the adjustment of this first correction parameter.And when these situations did not all reach, then correction parameter adjustment unit 230 can carry out this first correction parameter adjustment operation repeatedly, and not matching up between the inphase/orthogonal path proofreaied and correct validly.
The corresponding method flow of above apparatus of the present invention is illustrated in Fig. 4, wherein comprises;
Step 410: one first test signal and one second test signal that include corresponding to the composition of a first frequency are provided, and be an in-phase signal one of in this first, second test signal wherein, and another are orthogonal signalling;
Step 420: proofread and correct this first test signal according to present first correction parameter, to produce one first adjustment back test signal, wherein this present first correction parameter is corresponding to time of delay;
Step 430: provide one first to add and signal; This first adds one first quadrature that produced through the one first homophase analog signal (Ana_I1) that will be produced according to this first adjustment back test signal respectively and according to this second test signal with signal analog signal (Ana_Q1) mutually; Carry out a mixing operation with a same-phase local oscillated signal (LoIt) and a quadrature phase local oscillated signal (LoQt), and the result of this mixing operation of addition produces;
Step 440: this first is added and signal (S1) carries out a self-mixing (self-mixing) operation to produce one first measured signal (S1 ');
Step 450: upgrade this present first correction parameter in pairing one first performance number of one first CF (as: two times of fundamental frequencies) according to this first measured signal;
Do step 460: whether one first specified conditions reach?
Wherein, In step 460, can judge whether that first specified conditions reach, if when failing to reach; Then can return in the step 420; Adjust this first test signal according to this present first correction parameter after upgrading once more, and recomputate this first performance number, till these first specified conditions are satisfied.
Moreover, please refer to flow chart shown in Figure 5 about the adjustment mode of first correction parameter.At first; After step 510 begins to carry out; Then can get into step 520, utilize correction parameter adjustment unit 230 default initial values to set the first correction parameter Para_1, and correcting unit 210 just can be adjusted one among test signal BBIt and the BBQt in view of the above; Producing an adjustment back test signal, and detect the first measured signal S1 ' that produces according to this through follow-up testing circuit 220 and be twice in first performance number at fundamental frequency place.And in step 530, can detect this first performance number in this first correction parameter adjustment operation whether greater than this first performance number in first correction parameter adjustment operation last time, select the one first adjustment mode or the second adjustment mode.If first performance number of this operation just get into step 532, otherwise just gets into step 531 greater than first performance number of operation last time.If flow process gets into step 532, promptly represent present first correction parameter and not yet in effect in this first correction parameter adjustment operation to improve not matching of time of delay, then need change the adjustment mode of this present first correction parameter.For instance; If last time in first correction parameter adjustment operation be reduction this present first correction parameter (as: the second adjustment mode); Then this first correction parameter adjustment operation is necessary for one increases this present first correction parameter (as: the first adjustment mode), and vice versa.And if on behalf of this present first correction parameter in this first correction parameter adjustment operation, entering step 531 promptly improve not matching of causing time of delay really, therefore need not change the adjustment mode of this present first correction parameter.For instance, if last time be one to downgrade this present first correction parameter (as: the second adjustment mode) in the adjustment operation of first correction parameter, then this also continues to downgrade this present first correction parameter (as: the second adjustment mode), in like manner is used for the first adjustment mode.In brief,, then select the previous adjustment mode that is different from for use, get into step 531 and then continue to use the previous adjustment mode that is same as if get into step 532.
Should be noted in the discussion above that the present invention does not limit the adjusting range of this present first correction parameter in each first correction parameter adjustment operation to some extent.For instance; In one embodiment, the carrying out for quickening to proofread and correct possibly carry out coarse adjustment (rough tuning) more efficient and that adjusting range is bigger at the correction initial stage; And over time, carry out accurately and the less fine setting (fine tuning) of adjusting range.Perhaps, in an embodiment again, amplitude that should present first correction parameter increase in each first correction parameter adjustment operation possibly be asymmetric with the amplitude of minimizing.
In another embodiment of the present invention; For the whole correction of ability and frequency dependence and incoherent not matching to the influence of telecommunication circuit 240; And correcting mode is applied to than the broadband system; Therefore the composition that in test signal, has added second frequency makes can detect the power at different frequency place in the frequency spectrum by follow-up testing circuit 220 all do not match between the inphase/orthogonal path signal to eliminate.In this embodiment, homophase test signal BBIt will be cos (ω
M1T)+cos (ω
M2T) and orthogonal test signals BBQt will be sin (ω
M1T)+sin (ω
M2That is this moment, homophase test signal BBIt included first frequency ω t),
M1Pairing composition cos (ω
M1T) and second frequency ω
M2Pairing composition cos (ω
M2T), likewise, orthogonal test signals BBQt also is identical situation.What thus, the adder 247 of telecommunication circuit 240 was exported second adds with signal S2 and will be
At this moment, if will eliminate not matching in such telecommunication circuit, then necessary first observation signal frequency spectrum is at the two (2*f of frequency multiplication place
M1Or 2*f
M2) performance number, produce pairing first correction parameter Para_1 time of delay, to proofread and correct not matching that the different times in path delay are caused between the inphase/orthogonal path earlier.Then, again the observation signal frequency spectrum at frequency (f
M1+ f
M2) performance number located, to adjust one second correction parameter and one the 3rd correction parameter (gain and the phase place in the inphase/orthogonal path of causing corresponding to frequency mixer and local oscillated signal do not match).In detail; Whether please refer to Fig. 8, the top is second to add the frequency spectrum with signal S2, do not match by appropriate correction if need to understand; Then must observe in the frequency spectrum respectively and two kinds of image frequency composition B and pairing performance numbers of b that the fundamental frequency test signal is relevant; But be same as previous embodiment, this image frequency composition B and b are positioned at the high frequency part, so be difficult for calculating its performance number.So must produce one second measured signal S2 ' through the self-mixing mode, and observe and comprise the power that is associated with the image frequency composition in its frequency spectrum.Wherein, the present invention utilized (the 2 π f of two frequency multiplication places when the corrective delay, the time did not match
M1Or 2 π f
M2) A*B or a*b pairing first performance number relevant with the image frequency composition, and, utilize frequency (f proofreading and correct amplitude and phase place when not matching
M1+ f
M2) locate the image frequency composition relevant A*b+a*B performance number corresponding with two fundamental frequencies.
Fig. 3 illustrates the pairing device of present embodiment.Wherein second correcting circuit 311 of correcting unit 310 and the 3rd correcting circuit 312; Gain between the inphase/orthogonal path does not match and phase place does not match to proofread and correct respectively, and it is adjusted based on present second a correction parameter Para_2 (not matching corresponding to gain) and present the 3rd a correction parameter Para_3 (not matching corresponding to phase place) respectively.Should be noted that; Because not matching between the inphase/orthogonal path is the right notion of symbolic animal of the birth year, therefore, in other embodiment of the present invention; Also can utilize second, third correcting circuit 311 and 312 to come pair of orthogonal test signal BBQt to proofread and correct, to eliminate not matching between the inphase/orthogonal path.
At first, correcting unit 310 can utilize unmatched correction time of delay of 211 completion of first correcting circuit and frequency dependence earlier.And such program is same as the flow process of previous embodiment, so do not give unnecessary details in addition at this.In brief, when these first specified conditions reached, then correction parameter adjustment unit 230 was no longer adjusted the present first correction parameter Para_1, then began to carry out phase place and the unmatched correction of amplitude.Wherein, homophase test signal BBIt can pass through the adjustment of such first correcting circuit 211 and second correcting circuit 311 and produce adjusted homophase test signal BBIt '; In addition; Homophase test signal BBIt produces adjusted quadrature test signal BBQt ' mutually through the adjustment of the 3rd correcting circuit 312 with orthogonal test signals BBQt addition; Then can produce one second homophase analog signal Ana_I2, one second quadrature phase analog signal Ana_Q2 at low pass filter 243,244 respectively through the path in the telecommunication circuit 240; Carry out mixing through frequency mixer 245,246 and local oscillated signal LoIt, LoQt respectively again; Both produce one second through adder 247 totallings and add and signal S2, and detecting unit 220 then elder generation adds with signal S2 second and carries out self-mixing, to produce one second measured signal S2 '.And detecting unit 220 can be according to the second measured signal S2 ' in frequency (f
M1+ f
M2) the corresponding frequency spectrum composition in place; Produce one second performance number; Correction parameter adjustment unit 230 then carries out the one second and the 3rd correction parameter adjustment operation; It upgrades the present second correction parameter Para_2 and present the 3rd correction parameter Para_3 according to second performance number in each operation, wherein in each the second and the 3rd correction parameter adjustment is operated, and person one of among correction parameter adjustment unit 230 present second correction parameter Para_2 of renewal and present the 3rd correction parameter Para_3.In other words, correction parameter adjustment unit 230 upgrades present second correction parameter Para_2 and present the 3rd correction parameter Para_3 in turn.And when one second specified conditions reached, correction parameter adjustment unit 230 finished to carry out this second and the 3rd correction parameter adjustment operation; Otherwise correction parameter adjustment unit 230 carries out this second and the 3rd correction parameter adjustment operation repeatedly.Wherein, these second specified conditions are corresponding to the execution number of times of this second and the 3rd correction parameter adjustment operation, or the present size of this second performance number.Method flow about present embodiment has been summarized in Fig. 6 and since wherein the details of step similar in appearance to the flow chart of Fig. 4, so do not give unnecessary details in addition at this.
Generally speaking, the present invention have several radio-frequency components through input test signal to telecommunication circuit, to observe its influence of effect that do not match to the output signal of telecommunication circuit.And again through adjusting the mode of correction parameter repeatedly; Be twice near the variable power of observing the output signal relevant the fundamental frequency with the time with the image frequency composition; Find out best correction parameter, all/incoherent inphase/orthogonal phase paths relevant with fundamental frequency do not match in the telecommunication circuit to eliminate.
The above is merely the present invention's embodiment, and all equalizations of doing according to claims of the present invention change and modify, and all should belong to the present invention's covering scope.
Claims (22)
1. in-phase signal and orthogonal signalling of proofreading and correct in the telecommunication circuit method of (In-phase/Quadrature phase mismatch, I/Q mismatch) that do not match comprises:
One first test signal and one second test signal that include corresponding to a first frequency composition are provided, and be an in-phase signal one of in wherein said first test signal, second test signal, and another are orthogonal signalling;
Proofread and correct said first test signal according to present first correction parameter, to produce one first adjustment back test signal, wherein said present first correction parameter is corresponding to time of delay; And
Carry out one first correction parameter adjustment operation:
Provide one first to add and signal, said first add with signal through respectively with basis
One first homophase analog signal that the said first adjustment back test signal is produced and the one first quadrature phase analog signal that is produced according to said second test signal; Carry out a mixing operation with a same-phase local oscillated signal and a quadrature phase local oscillated signal, and the result of the said mixing operation of addition produces; And
Add with signal said first and to carry out a self-mixing (self-mixing) operation to produce one first measured signal; And upgrade said present first correction parameter in pairing one first performance number of one first CF according to said first measured signal;
When one first specified conditions reach, finish said first correction parameter adjustment operation; Otherwise, repeat said first correction parameter adjustment operation, till said first specified conditions are satisfied.
2. method according to claim 1, the step of wherein upgrading said present first correction parameter comprises:
In one first adjustment mode and one second adjustment mode, select one and adjust said present first correction parameter.
3. method according to claim 2; The wherein said first adjustment mode include with said present first correction parameter add one first the adjustment parameter, and the said second adjustment mode include with said present first correction parameter deduct one second the adjustment parameter.
4. method according to claim 3, the wherein said first adjustment parameter has different sizes in different first correction parameter adjustment operations, and the said second adjustment parameter has different sizes in different first correction parameter adjustment operations.
5. method according to claim 2, wherein in said first adjustment mode and the said second adjustment mode, select a step of adjusting said present first correction parameter to include:
During said first performance number that said first performance number when present first correction parameter adjustment operation is carried out is not more than that previous first correction parameter adjustment operation carries out, upgrade said present first performance number with the adjustment mode that is same as in said previous first correction parameter adjustment operation; And
During said first performance number when said first performance number when said present first correction parameter adjustment operation is carried out is carried out greater than previous first correction parameter adjustment operation, upgrade said present first performance number with the adjustment mode that is different from said previous first correction parameter adjustment operation.
6. method according to claim 1 wherein after said first correction parameter adjustment operation has repeated a pre-determined number, judges that then said first specified conditions reach.
7. method according to claim 1 wherein when pairing said first performance number is operated in present first correction parameter adjustment less than a predetermined value, judges that then said first specified conditions reach.
8. method according to claim 1, wherein said first CF are the twice of said first frequency.
9. method according to claim 1, wherein said first test signal, second test signal include the composition corresponding to a second frequency again respectively, and said second frequency is different from said first frequency.
10. method according to claim 9 also includes:
Proofread and correct said first test signal according to present second correction parameter and present the 3rd correction parameter; To produce said first adjustment back test signal and one second adjustment back test signal, wherein said present second correction parameter and said present the 3rd correction parameter correspond respectively to amplitude and phase place; And
Carry out the one second and the 3rd correction parameter adjustment operation:
Provide one second to add and signal; Said second adds and the one second homophase analog signal of signal through will being produced according to the said first adjustment back test signal, the second adjustment back test signal, one second quadrature analog signal mutually; Carry out a mixing operation with said same-phase local oscillated signal and said quadrature phase local oscillated signal respectively, and the result of the said mixing operation of addition produces;
Add with signal said second and to carry out self-mixing operation to produce one second measured signal; And
Upgrade said present second correction parameter and said present the 3rd correction parameter according to said second measured signal in pairing one second performance number of one second CF, wherein in said present second correction parameter and said present the 3rd correction parameter is upgraded in each the second and the 3rd correction parameter adjustment operation;
When one second specified conditions reach, finish the said second and the 3rd parameter adjustment operation; Otherwise, repeat the said second and the 3rd parameter adjustment operation.
11. method according to claim 10, wherein said second CF are said first frequency and said second frequency sum.
(the In-phase/Quadrature phase mismatch 12. in-phase signal and orthogonal signalling of proofreading and correct in the telecommunication circuit do not match; I/Q mismatch) device; One first test signal and one second test signal to the said telecommunication circuit that include corresponding to the composition of a first frequency are provided; Be an in-phase signal one of in wherein said first, second test signal, and another is orthogonal signalling, said device comprises;
One correcting unit; Receive said first test signal and said second test signal respectively; In order to proofread and correct said first test signal according to present first correction parameter, to produce one first adjustment back test signal, wherein said present first correction parameter is corresponding to time of delay;
One detecting unit; Carry out self-mixing operation to produce one first measured signal in order to add with signal to one first; And calculate said first measured signal in pairing one first performance number of one first CF; Wherein said first adds the one first homophase analog signal that will be produced according to the said first adjustment back test signal respectively by said telecommunication circuit with signal; And the one first quadrature phase analog signal that is produced according to said second test signal, carry out mixing through frequency mixer and a same-phase local oscillated signal and a quadrature phase local oscillated signal, and produce through the result of the said mixing of an adder addition; And
One correction parameter adjustment unit; Be coupled to said correcting unit and said detecting unit; In order to carry out one first correction parameter adjustment operation according to said first performance number to upgrade said present first correction parameter; Wherein when one first specified conditions reached, said correction parameter adjustment unit finished to carry out said first correction parameter adjustment operation; Otherwise said correction parameter adjustment unit repeats said first correction parameter adjustment operation.
13. said present first correction parameter is adjusted in the selection in one first adjustment mode and one second adjustment mode of device according to claim 12, wherein said correction parameter adjustment unit.
14. device according to claim 13; Wherein when said correction parameter adjustment unit selects said first to adjust mode; Said correction parameter adjustment unit adds one first adjustment parameter with said present first correction parameter; And when said correction parameter adjustment unit selected said second to adjust mode, said correction parameter adjustment unit deducted one second adjustment parameter with said present first correction parameter.
15. device according to claim 14, the wherein said first adjustment parameter has different sizes in different first correction parameter adjustment operations, and the said second adjustment parameter has different sizes in different first correction parameter adjustment operations.
16. device according to claim 13, wherein:
During said first performance number that said first performance number when said correction parameter adjustment unit carries out present first correction parameter adjustment operation is not more than said correction parameter adjustment unit when carrying out previous first correction parameter adjustment operation, the adjustment mode when said correction parameter adjustment unit carries out to be same as said previous first correction parameter adjustment operation is upgraded said present first performance number; And
During said first performance number when said first performance number when said correction parameter adjustment unit carries out said present first correction parameter adjustment operation is carried out said previous first correction parameter adjustment operation greater than said correction parameter adjustment unit, the adjustment mode when said correction parameter adjustment unit carries out to be different from said previous first correction parameter adjustment operation is upgraded said present first performance number.
17. device according to claim 12, wherein if said correction parameter adjustment unit has repeated said first correction parameter adjustment operation reach a pre-determined number after, then said correction parameter adjustment unit judges that said first specified conditions reach.
18. device according to claim 12; Wherein said first performance number when if said correction parameter adjustment unit carries out present first correction parameter adjustment operation less than a predetermined value, then said correction parameter adjustment unit judges that said first specified conditions reach.
19. device according to claim 12, wherein said first CF are the twice of said first frequency.
20. device according to claim 12, said first, second test signal that wherein said device provided also includes the composition corresponding to a second frequency respectively, and said second frequency is different from said first frequency.
21. device according to claim 20; Wherein said correcting unit is also proofreaied and correct said first test signal according to present second correction parameter and present the 3rd correction parameter; To produce the said first adjustment back test signal; And produce one second adjustment back test signal; Wherein said present second correction parameter and said present the 3rd correction parameter correspond respectively to amplitude and phase place; And said telecommunication circuit is through producing one second homophase analog signal and one second quadrature analog signal mutually according to the said first adjustment back test signal, the second adjustment back test signal respectively; And with the said second homophase analog signal and said second quadrature mutually analog signal come to carry out a mixing operation through frequency mixer respectively with a same-phase local oscillated signal, a quadrature phase local oscillated signal, and the result of the said mixing operation of addition produces one second and adds and signal; Said detecting unit carries out self-mixing operation producing one second measured signal in order to add with signal said second, and calculates said second measured signal in pairing one second performance number of one second CF; Said correction parameter adjustment unit is in order to carry out the one second and the 3rd correction parameter adjustment operation; It upgrades said present second correction parameter and said present the 3rd correction parameter according to said second performance number; Wherein in each the second and the 3rd correction parameter adjustment operation; Said correction parameter adjustment unit upgrades in said present second correction parameter and said present the 3rd correction parameter; And when one second specified conditions reached, said correction parameter adjustment unit no longer carried out the said second and the 3rd parameter adjustment operation; Otherwise said correction parameter adjustment unit repeats the said second and the 3rd parameter adjustment operation.
22. device according to claim 21, wherein said second CF are said first frequency and said second frequency sum.
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| CN106330796A (en) * | 2015-07-01 | 2017-01-11 | 晨星半导体股份有限公司 | Mismatching compensation device and method, and mismatching detection device |
| CN110868227A (en) * | 2018-08-28 | 2020-03-06 | 瑞昱半导体股份有限公司 | Transmission circuit capable of measuring image rejection ratio of transmission end |
| CN113179138A (en) * | 2020-01-09 | 2021-07-27 | 瑞昱半导体股份有限公司 | Transceiver and transceiver calibration method |
| TWI819181B (en) * | 2020-01-06 | 2023-10-21 | 瑞昱半導體股份有限公司 | Transceiver and transceiver calibration method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105187338A (en) * | 2014-05-30 | 2015-12-23 | 瑞昱半导体股份有限公司 | Communication system correction method and device |
| CN105187338B (en) * | 2014-05-30 | 2019-03-01 | 瑞昱半导体股份有限公司 | Communication system bearing calibration and means for correcting |
| CN106330796A (en) * | 2015-07-01 | 2017-01-11 | 晨星半导体股份有限公司 | Mismatching compensation device and method, and mismatching detection device |
| CN110868227A (en) * | 2018-08-28 | 2020-03-06 | 瑞昱半导体股份有限公司 | Transmission circuit capable of measuring image rejection ratio of transmission end |
| TWI819181B (en) * | 2020-01-06 | 2023-10-21 | 瑞昱半導體股份有限公司 | Transceiver and transceiver calibration method |
| CN113179138A (en) * | 2020-01-09 | 2021-07-27 | 瑞昱半导体股份有限公司 | Transceiver and transceiver calibration method |
| CN113179138B (en) * | 2020-01-09 | 2023-02-24 | 瑞昱半导体股份有限公司 | Transceiver and transceiver calibration method |
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