CN102570983A - Harmonic attenuation method and circuit - Google Patents
Harmonic attenuation method and circuit Download PDFInfo
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- CN102570983A CN102570983A CN2012100070217A CN201210007021A CN102570983A CN 102570983 A CN102570983 A CN 102570983A CN 2012100070217 A CN2012100070217 A CN 2012100070217A CN 201210007021 A CN201210007021 A CN 201210007021A CN 102570983 A CN102570983 A CN 102570983A
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Abstract
The embodiment of the invention discloses a harmonic attenuation method and a circuit. The method and the circuit are used for solving the problem of interference of different-order harmonics during a down-conversion process. The method provided by the embodiment of the invention comprises the steps: respectively inputting a same radio-frequency signal to a first active link and at least one path of second active link of a harmonic attenuation circuit; performing adjustment and phase shift on the radio-frequency signal inputted to the first active link by a first phase shifter, and then performing the down-conversion on the radio-frequency signal and a local oscillating signal inputted to a first down-converter; performing adjustment and phase shift on the radio-frequency signal inputted to the second active link by a second phase shifter, and then performing the down-conversion on the radio-frequency signal and the local oscillating signal inputted to a second down-converter; and lastly, adding the radio-frequency signals of all active links by an adder of the harmonic attenuation circuit, thereby efficiently attenuating the different-order harmonics.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of harmonic suppressing method and circuit.
Background technology
In the down-conversion of converter technique; Low-converter is with the signal mixing of radiofrequency signal that receives and local oscillator generation; Utilize local oscillation signal periodically to control its internal circuit conducting and disconnection, make the input radio frequency signal, the radio-frequency input signals that obtains being interrupted at output through behind the low-converter.If radio-frequency input signals is U
RF(t)=V
RFCos (W
RFT), wherein, V
RFExpression radiofrequency signal amplitude, W
RFThe expression radio frequency signal frequency.Along with the positive and negative switching of low-converter switching signal, obtain the conducting and the disconnection of input signal at output, the output signal is equivalent to the product of the switching signal of radio-frequency input signals and square wave, suc as formula (1):
(1)：U
out(t)＝U
RF(t)sgn(t)
Wherein, sgn (t) representes switching signal, switching signal is carried out Fourier expansion get formula (2):
(2)：sgn(t)＝(4/π)【sin(W
LOt)+1/3sin(3W
LOt)+1/5sin(5W
LOt+------】
Wherein, W
LOThe expression local frequency, formula (2) substitution formula (1) can be exported signal and do, suc as formula (3):
(3)：U
out(t)＝V
RFcos(W
RFt)(4/π)【sin(W
LOt)+1/3sin(3W
LOt)+1/5sin(5W
LOt+------】
The product of radio-frequency input signals and local oscillation signal is a desired signal in the formula (3), is expressed as formula (4):
(4)：U(t)＝(4/π)V
RFcos(W
RFt)sin(W
LOt)
Can know from above analysis, work as U
RFWhen (t) being broadband signal, U
RFThe interference signal that can comprise upper frequency (t), the odd harmonic component in the switching signal will produce the down-conversion interference signal.And from formula (2) but the shake amplitude of three order harmonicses and five order harmonicses of signal of knowledge capital be respectively first-harmonic-4.77dB and-6.99dB; The amplitude of seven rank and nine order harmonicses is respectively-8.45dB and-9.54dB; If on the frequency range of corresponding upper frequency interference signal is arranged, then useful signal is produced and disturb.
At present, the research that the local oscillator harmonic wave suppresses mainly is to set about from the structural level of low-converter, has related to a kind of harmonic wave and has suppressed structure frequency mixer (HRM, Harmonic Rejection Mixers).In HRM, harmonic wave inhibition structure that adopts the transconductance linearity technology and the harmonic rejection mixing structure of adding compensating circuit etc. are arranged.Its basic structure is made up of three strip mixing links exactly, and every chain route amplifier and frequency mixer are formed.The radiofrequency signal of input is amplified different coefficients through amplifier and is arrived frequency mixer; The amplification coefficient ratio of three strip mixing links is that 45 ° local oscillator phase place is carried out mixing for
each frequency mixer uses phase difference; Be respectively 0 °, 45 ° and 90 ° like phase place, last again the output signal of each sub-mixers superposeed.
This HRM can suppress three order harmonicses and five order harmonicses, but can not effectively suppress seven order harmonicses and nine order harmonicses, and from the analysis to formula (2), the interference that seven order harmonicses and nine order harmonicses bring is can not be uncared-for, thereby has limited the serviceability of RHM.
Summary of the invention
To above-mentioned defective, the embodiment of the invention provides a kind of harmonic suppressing method and circuit, in downconversion process, receives the problem of Harmonic Interference in order to solve radiofrequency signal, and can suppress different order harmonic waves neatly as required.
A kind of harmonic suppressing method comprises:
First active link and at least one road second active link that radiofrequency signal difference input harmonics are suppressed circuit; Said first active link comprises first phase shifter and first low-converter, and said second active link comprises second phase shifter, second low-converter and switch;
The radiofrequency signal of importing said first active link is through said first phase shifter adjustment phase shift, and the radiofrequency signal of importing said second active link is through said second phase shifter adjustment phase shift;
Said first phase shifter of process is adjusted said first low-converter of dephased radiofrequency signal process and is carried out the radiofrequency signal after down-conversion obtains first down-conversion with the local oscillation signal of importing said first low-converter, and the local oscillation signal of adjusting dephased radiofrequency signal said second low-converter of process and said second low-converter of input through said second phase shifter carries out the radiofrequency signal after down-conversion obtains second down-conversion;
The adder of radiofrequency signal after the radiofrequency signal after first down-conversion and second down-conversion all being imported said harmonic wave inhibition circuit superposes.
A kind of harmonic wave suppresses circuit, comprises adder 210, first active link 220 and at least one road second active link 230;
Said first active link 220 comprises first phase shifter 221 and first low-converter 222; The input of said first phase shifter 221 is connected with the input source of radiofrequency signal; The output of said first phase shifter 221 is connected with the first input end of said first low-converter 222; Second input of said first low-converter 222 is connected with the input source of local oscillation signal, and the output of said first low-converter 222 is connected with the first input end of said adder 210;
Said second active link 230 comprises second phase shifter 231, second low-converter 232 and switch 233; The input of said second phase shifter 231 is connected with the input source of said radiofrequency signal; The output of said second phase shifter 231 is connected with the first input end of said second low-converter 232; Second input of said second low-converter 232 is connected with the input source of local oscillation signal; The output of said second low-converter 232 is connected with an end of said switch 233, and the other end of said switch 233 is connected with second input of said adder 210.
Can find out that from above technical scheme the embodiment of the invention has the following advantages:
Harmonic wave among the present invention suppresses circuit and comprises adder, one tunnel first active link and at least one road second active link; First active link comprises first phase shifter and first low-converter; Radiofrequency signal is imported first active link through the phase shift of said first phase shifter adjustment radiofrequency signal; Carry out down-conversion through said first low-converter and the local oscillation signal of importing said first low-converter, again the local oscillation signal after the down-conversion is imported said adder; Simultaneously; Second active link comprises second phase shifter, second low-converter and switch; Radiofrequency signal is imported the phase shift through said second phase shifter adjustment radiofrequency signal of said second active link, after carry out down-conversion through the local oscillation signal of said second low-converter and said second low-converter of input, the radiofrequency signal after the down-conversion is imported said adder through said switch; Said adder receives the radiofrequency signal of the input of first active link and second active link; Reach inhibition harmonic wave purpose thereby carry out the radiofrequency signal stack then, and the second working chain way is selected by user flexibility, thereby can suppresses different order harmonic waves.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention; To do to introduce simply to the accompanying drawing of required use in the embodiment of the invention below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The basic flow sheet of a kind of harmonic suppressing method that Fig. 1 provides for the embodiment of the invention;
A kind of harmonic wave that Fig. 2 provides for the embodiment of the invention suppresses the basic block diagram of circuit;
A kind of harmonic wave that Fig. 3 provides for the embodiment of the invention suppresses the work structuring figure of circuit;
The basic block diagram of a kind of local oscillation signal maker that Fig. 4 provides for the embodiment of the invention;
The work structuring figure of a kind of local oscillation signal maker that Fig. 5 provides for the embodiment of the invention.
Embodiment
The accompanying drawing that will combine the embodiment of the invention below carries out clear, intactly description to the technical scheme in the embodiment of the invention, and obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention provides a kind of harmonic suppressing method; Through same radiofrequency signal difference input harmonics being suppressed first active link and second active link of circuit; By the phase shift of first phase shifter adjustment radiofrequency signal, the local oscillation signal of first low-converter of back and input first active link carries out down-conversion in first active link, and the radiofrequency signal of importing second active link is through second phase shifter adjustment phase shift; Down-conversion is carried out with the local oscillation signal of importing second active link in the back; The adder that harmonic wave suppresses circuit receives the radiofrequency signal of first active link and the input of second active link, and carries out the stack of radiofrequency signal, thereby suppresses different order harmonic waves flexibly; In addition; The embodiment of the invention also provides a kind of harmonic wave to suppress circuit and relevant device, sees also Fig. 1～Fig. 5, will be elaborated to the embodiment of the invention below:
Embodiment one
See also Fig. 1, the basic flow sheet of a kind of harmonic suppressing method that Fig. 1 provides for the embodiment of the invention.The angle that will suppress circuit below from harmonic wave is described the embodiment of the invention in detail, and as shown in Figure 1, the method comprising the steps of:
110, first active link and at least one road second active link that radiofrequency signal difference input harmonics are suppressed circuit;
Radiofrequency signal can receive the interference of harmonic wave when down-conversion, select to suppress circuit through harmonic wave and suppress harmonic wave.Suppress in the circuit at this harmonic wave; Comprise adder, first active link and at least one road second active link; First active link is the groundwork link; And first active link comprises first phase shifter and first low-converter, and second active link comprises second phase shifter and second low-converter, also comprises a switch.The different order harmonic waves that suppress are as required imported first active link and second active link respectively with radiofrequency signal, and wherein, the working chain way of second active link is confirmed according to the work at present frequency by the user.
120, the radiofrequency signal of said first active link of input is through said first phase shifter adjustment phase shift, and the radiofrequency signal of importing said second active link is through said second phase shifter adjustment phase shift;
Phase shifter adjustment radiofrequency signal phase shift through each active link; Wherein, The phase shift of phase shifter can simply be controlled through circuit voltage; And make that the phase shift of phase shifter of each road active link is different, after the radiofrequency signal that the user receives is imported first active link and second active link along separate routes, through obtaining the radiofrequency signal of different phase shifts behind the phase shifter on each road respectively.
130, adjust dephased radiofrequency signal through said first phase shifter and carry out the radiofrequency signal after down-conversion obtains first down-conversion, adjust dephased radiofrequency signal through said second phase shifter and carry out the radiofrequency signal after down-conversion obtains second down-conversion through the local oscillation signal of said second low-converter and said second low-converter of input through the local oscillation signal of said first low-converter and said first low-converter of input;
After the radiofrequency signal of each road active link was adjusted phase shift by phase shifter, the local oscillation signal of importing low-converter and low-converter again carried out down-conversion.
140, the radiofrequency signal after the radiofrequency signal after first down-conversion and second down-conversion all being imported the adder that said harmonic wave suppresses circuit superposes.
Adder receives the different radiofrequency signal of down-converted component of each road active link input, and carries out the radiofrequency signal stack, thereby reaches the purpose that suppresses harmonic wave.
In the embodiment of the invention; Through radiofrequency signal being imported first active link and at least one road second active link; Carry out down-conversion with the local oscillation signal of importing first low-converter after first phase shifter adjustment phase shift through first active link; The local oscillation signal that same radiofrequency signal is imported after second phase shifter adjustment phase shift of second active link with input second low-converter carries out down-conversion; The equal input summer of radiofrequency signal through after the down-conversion carries out the stack of radiofrequency signal, thereby suppresses different order harmonic waves.
Wherein, First active link is represented during work need not suppress harmonic wave as the groundwork link, so do not do phase shift through the radiofrequency signal of first active link; The phase shift of first phase shifter is 0 °, and the phase shift of importing the local oscillation signal of first low-converter also is 0 °.
As optimal way; In second active link, the phase shift of second phase shifter of i road second active link is i*180 °/m, simultaneously; The phase shift of the local oscillation signal of second low-converter also is i*180 °/m; M is the active link sum of first active link and second active link, and simultaneously, m is confirmed by the frequency range of the radiofrequency signal that needs detect.Can find out from i*180 °/m, comprise that the phase shift difference of phase shifter of any adjacent two-way active link of first active link is 180 °/m, and the phase shift difference of local oscillation signal of importing the low-converter of any adjacent two-way is 180 °/m.
Embodiment two
As shown in Figure 2, the embodiment of the invention also provides a kind of harmonic wave to suppress circuit, and this circuit comprises adder 210, the first active links 220 and at least one road second active link 230;
Said first active link 220 comprises first phase shifter 221 and first low-converter 222; The input of said first phase shifter 221 is connected with the input source of radiofrequency signal; The output of said first phase shifter 221 is connected with the first input end of said first low-converter 222; Second input of said first low-converter 222 is connected with the input source of local oscillation signal, and the output of said first low-converter 222 is connected with the first input end of said adder 210;
Said second active link 230 comprises second phase shifter 231, second low-converter 232 and switch 233; The input of said second phase shifter 231 is connected with the input source of said radiofrequency signal; The output of said second phase shifter 231 is connected with the first input end of said second low-converter 232; Second input of said second low-converter 232 is connected with the input source of local oscillation signal; The output of said second low-converter 232 is connected with an end of said switch 233, and the other end of said switch 233 is connected with second input of said adder 210.
The frequency range of the radiofrequency signal that the user can detect as required need to confirm the active link sum of setting; It is the active link sum of first active link and second active link in the embodiment of the invention; If the broadband of the radiofrequency signal that the user receives is B, its upper frequency limit is f
uUnder be limited to f
i, calculate the order m that the maximum odd harmonics that in down-conversion, possibly receive is disturbed
r, the active link sum of definite maximum possible that needs.The order m that maximum odd harmonics is disturbed
rBe lower frequency limit f
iThe time the maximum odd harmonics that receives disturb corresponding order, for being not more than f
u/ f
iMaximum odd number, possible active link sum m is m=(m
r+ 1)/2.Wherein, first active link 220 remains m-1 road second active link 230 as the groundwork link.
As optimal way, first active link is as the groundwork link, and the phase shift of first phase shifter 221 is 0 ° with the phase shift of the local oscillation signal of input first low-converter.In second active link; The phase shift of second phase shifter on i road is i*180 °/m; Simultaneously; The phase shift of local oscillation signal of importing second low-converter on i road is i*180 °/m; The phase shift difference of second phase shifter of adjacent two-way second active link is 180 °/m; The phase shift difference of local oscillation signal of importing second low-converter of adjacent two-way second active link is 180 °/m, and the phase shift difference of second phase shifter of first phase shifter of first active link and the first via second active link is 180 °/m, and the phase shift difference of local oscillation signal and the local oscillation signal of second low-converter of the input first via second active link of importing first low-converter of first active link is 180 °/m.
According to work at present efficient, can confirm harmonic wave when the inferior maximum order that need suppress, thus definite working chain way that needs second active link of connection.If work at present frequency f
o(f
i＜f
c＜f
u), the order j that sets the current needed largest inhibition odd harmonic of user is for being not more than f
o/ f
iMaximum odd number, then active link adds up to n, n=(i+1)/2 and n≤m comprise (n-1) road second active link and one tunnel first active link that needs are communicated with.Wherein, the phase shift of first phase shifter of first active link is 0 °, and the phase shift of the local oscillation signal of first low-converter is 0 °.The phase shift of second phase shifter of i road second active link in second active link of n-1 road is i*180 °/n; And the phase shift of local oscillation signal of being imported second low-converter of i road second active link by the local oscillation signal maker is i*180 °/n; The phase shift difference of the phase shifter of any adjacent two-way active link in the active link of n road is 180 °/n, and the phase shift difference of the low-converter of any adjacent two-way active link is 180 °/n.
In downconversion process; There is its first-harmonic of local oscillation signal of phase shift different with the phase shift of high-order odd harmonic component; The phase shift of fundametal compoment is equal to the phase shift of local oscillation signal, and the phase shift of high-order odd harmonic component is the multiple of local oscillation signal phase shift, and its multiple is the harmonic order number of times.This just can be so that among the output result of every active link, and the down-converted component phase place of local oscillation signal first-harmonic and high-order odd harmonic has nothing in common with each other and amplitude is identical.Wherein, the phase shift of the down-converted component of the radiofrequency signal of first active link output is 0 °, and the j order harmonics down-converted component of exporting in second active link of i road is:
Wherein, w
bBe the frequency of down-converted component, and the j order harmonics down-converted component of exporting in the active link of n road and be zero, that is:
Make every road down-converted component pass through the stack of adder, can realize the harmonic wave of different orders such as three rank, five rank, seven rank, satisfy the purpose that the flexible link realizes that harmonic wave suppresses.
Embodiment three
As shown in Figure 3; Below will be from the practical application scene, suppressing the circuit link of always working with harmonic wave is that n=4 illustrates, and can suppress the harmonic wave that maximum order is seven rank; Wherein, This harmonic wave suppresses circuit and comprises an adder, one tunnel first active link and three tunnel second active links, and its operation principle is following:
First active link comprises a phase shifter and a low-converter; Second active link comprises a phase shifter, a low-converter and a switch; Second active link is connected on the adder through switch; Simultaneously, suppress different order harmonic waves, comprising through switch disconnection or the closure of controlling in second active link:
A1, in the time need not suppressing harmonic wave, switch SW 1, SW2, SW3 all break off, and have only the first active link work;
A2, when suppressing three order harmonicses, switch SW 2, SW3 break off, SW1 is closed, the first active link work and the first via second active link work;
A3, when suppressing three rank and five order harmonicses, switch SW 1, SW2 are closed, SW3 breaks off, first active link and the second active link work of first and second road;
A4, when suppressing three rank, five rank and seven rank, switch SW 1, SW2, SW3 are all closed, all working link is all worked.
Wherein, the phase shift of the phase shifter of active link is respectively 0 °, 45 °, 90 ° and 135 °, and the phase shift of the local oscillation signal of outside local oscillation signal maker input low-converter is 0 °, 45 °, 90 ° and 135 °.
In above-mentioned A4, can suppress three order harmonicses, five order harmonicses and seven order harmonicses simultaneously, at this moment, the phase shift of three order harmonics down-converted component is: 0 ° ,-90 ° ,-180 ° and-270 °; The phase shift of five order harmonics down-converted component is: 0 ° ,-180 °, 0 ° and-180 °; The phase shift of seven order harmonics down-converted component is: 0 ° ,-270 ° ,-180 ° and-90 °.Radiofrequency signal after the process down-conversion of four road active links through the adder stack, can realize suppressing the purpose of three order harmonicses, five order harmonicses and seven order harmonicses.
Embodiment four
As shown in Figure 4; The embodiment of the invention also provides a kind of local oscillation signal maker; Be used for to the harmonic wave inhibition circuit of the embodiment of the invention local oscillation signal being provided, this local oscillation signal maker comprises clock 410, the first local oscillation signal generation unit and at least one second local oscillation signal generation unit;
The said first local oscillation signal generation unit comprises first d type flip flop 421, second d type flip flop 422 and first switch 423; The triggering signal pin of said first d type flip flop 421 is first output of local oscillation signal; The same-phase output pin of said first d type flip flop 421 is connected with the triggering signal of said second d type flip flop 422; The triggering signal pin of said second d type flip flop 422 is second output of local oscillation signal; The same-phase pin of said second d type flip flop 422 is connected with an end of said first switch 423, and the other end of said first switch 423 is connected with the triggering signal pin of said first d type flip flop 421;
The said second local oscillation signal production unit comprises first d type flip flop 431, tail trigger 432 and switch 433; The triggering signal pin of said first d type flip flop 431 is connected with the same-phase output pin of second trigger 422 of the said first local oscillation signal generation unit; The same-phase output pin of said first d type flip flop 431 is connected with the triggering signal pin of said tail d type flip flop 432; The same-phase output pin of said tail d type flip flop 432 is connected with an end of said switch 433, and another end of said switch 433 is connected with the triggering signal pin of first d type flip flop 421 of the said first local oscillation signal generation unit;
The clock signal pin of said first d type flip flop 421, said second d type flip flop 422, said first d type flip flop 431 and said tail d type flip flop 432 all is connected with said clock 410.
Wherein, The total quantity of the d type flip flop of the d type flip flop of the first local oscillation signal generation unit and the second local oscillation signal generation unit can be 2m; And number of switches m; Loi is the local oscillation signal input source of the low-converter of the harmonic wave i road active link that suppresses circuit, and when promptly being the 1st trigger with first d type flip flop of the first local oscillation signal generation unit, the local oscillation signal of i d type flip flop is imported the low-converter of i road active link.In this 2m d type flip flop, a preceding m initial value puts 1, and a back m initial value puts 0, and the local oscillation signal of loi is (i-1) 180 °/m in the preceding m d type flip flop, and the frequency of clock is 2 times of local oscillation signal frequency.
Embodiment five
As shown in Figure 5, below will be from the practical application scene, when m=4, the local oscillation signal maker comprises 4 d type flip flops, 4 switches and 1 clock, and preceding 4 d type flip flop initial values put 1, and back 4 d type flip flop initial values put 0, and its operation principle is explained as follows:
B1, when needs generate the local oscillation signal of different phase shifts in 4, then switch S 1, S2, S3 break off, S4 is closed, preceding 4 d type flip flop initial values put 1, back 4 d type flip flop initial values put 0, clock frequency is 8 times of local oscillation signal frequency;
B2, when needs generate the local oscillation signal of 3 kinds of different phase shifts, then switch S 1, S2, S4 break off, S3 is closed, preceding 3 d type flip flop initial values put 1, back 3 d type flip flop initial values put 0, clock frequency is 6 back ofs the body of local oscillation signal frequency;
B3, when needs generate the local oscillation signal of 2 kinds of different phase shifts, then switch S 1, S3, S4 break off, S2 is closed, preceding 2 d type flip flop initial values put 1, back 2 d type flip flop initial values put 0, clock frequency is 4 times of local oscillation signal frequency;
B4, when needs generate the local oscillation signal of a kind of phase shift, then switch S 2, S3, S4 break off, S1 is closed, preceding 1 d type flip flop initial value puts 1, back 1 d type flip flop initial value puts 0, clock frequency is 2 times of local oscillation signal frequency.
The local oscillation signal that preceding 4 d type flip flops generate suppresses the input source of the low-converter of circuit respectively as the harmonic wave among the embodiment three; The phase shift of the local oscillation signal of the 1st d type flip flop generation is 0 °; The phase shift of the local oscillation signal of the 2nd d type flip flop generation is 45 °; The phase shift of the local oscillation signal of the 3rd d type flip flop generation is 90 °, and the phase shift of the local oscillation signal of the 4th d type flip flop generation is 135 °.
The present invention is through importing radiofrequency signal respectively one tunnel first active link and at least one road second active link; By the phase shifter adjustment phase shift of every road active link, down-conversion is carried out with the local oscillation signal of importing low-converter in the back, and the radiofrequency signal input summer after the down-conversion of every road superposes; Thereby inhibition harmonic wave; Avoid the interference of harmonic wave to radiofrequency signal, thereby and the working chain way of selected as required second active link, satisfy the requirement that suppresses different order harmonic waves; This scheme is simple and convenient, has effectively suppressed the interference of harmonic wave in the down-conversion.
More than a kind of harmonic suppressing method provided by the present invention and circuit have been carried out detailed introduction; For one of ordinary skill in the art; Thought according to the embodiment of the invention; The part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a harmonic suppressing method is characterized in that, comprising:
First active link and at least one road second active link that radiofrequency signal difference input harmonics are suppressed circuit; Said first active link comprises first phase shifter and first low-converter, and said second active link comprises second phase shifter, second low-converter and switch;
The radiofrequency signal of importing said first active link is through said first phase shifter adjustment phase shift, and the radiofrequency signal of importing said second active link is through said second phase shifter adjustment phase shift;
Said first phase shifter of process is adjusted said first low-converter of dephased radiofrequency signal process and is carried out the radiofrequency signal after down-conversion obtains first down-conversion with the local oscillation signal of importing said first low-converter, and the local oscillation signal of adjusting dephased radiofrequency signal said second low-converter of process and said second low-converter of input through said second phase shifter carries out the radiofrequency signal after down-conversion obtains second down-conversion;
The adder of radiofrequency signal after the radiofrequency signal after first down-conversion and second down-conversion all being imported said harmonic wave inhibition circuit superposes.
2. harmonic suppressing method according to claim 1 is characterized in that the phase shift difference of the phase shifter of adjacent two-way active link is 180 °/m, and the phase shift difference of local oscillation signal of importing the low-converter of adjacent two-way active link is 180 °/m.
3. harmonic suppressing method according to claim 2 is characterized in that, the value of said m is definite by the frequency range of the radiofrequency signal that needs detect, perhaps
Said m is the active link sum of said first active link and said second active link.
4. a harmonic wave suppresses circuit, it is characterized in that, comprises adder (210), first active link (220) and at least one road second active link (230);
Said first active link (220) comprises first phase shifter (221) and first low-converter (222); The input of said first phase shifter (221) is connected with the input source of radiofrequency signal; The output of said first phase shifter (221) is connected with the first input end of said first low-converter (222); Second input of said first low-converter (222) is connected with the input source of local oscillation signal, and the output of said first low-converter (222) is connected with the first input end of said adder (210);
Said second active link (230) comprises second phase shifter (231), second low-converter (232) and switch (233); The input of said second phase shifter (231) is connected with the input source of said radiofrequency signal; The output of said second phase shifter (231) is connected with the first input end of said second low-converter (232); Second input of said second low-converter (232) is connected with the input source of local oscillation signal; The output of said second low-converter (232) is connected with an end of said switch (233), and the other end of said switch (233) is connected with second input of said adder (210).
5. harmonic wave according to claim 4 suppresses circuit, it is characterized in that the phase shift difference of the phase shifter of adjacent two-way active link is that the phase shift difference of the local oscillation signal of 180 °/m and the low-converter of importing adjacent two-way active link is 180 °/m.
6. harmonic wave according to claim 5 suppresses circuit, it is characterized in that, the value of said m is definite by the frequency range of the radiofrequency signal that needs detect, perhaps
Said m is the active link sum of first active link (220) and second active link (230).
7. suppress circuit according to each described harmonic wave of claim 4～6, it is characterized in that the input source of said local oscillation signal is the local oscillation signal maker.
8. harmonic wave according to claim 7 suppresses circuit, it is characterized in that said local oscillation signal maker comprises clock, the first local oscillation signal generation unit and at least one second local oscillation signal generation unit;
The said first local oscillation signal generation unit comprises first d type flip flop, second d type flip flop and first switch; The triggering signal pin of said first d type flip flop is connected with second input of first low-converter of said first active link; The same-phase output pin of said first d type flip flop is connected with the triggering signal pin of said second d type flip flop; Said the 2nd D triggering signal pin is connected with second input of second low-converter of said second active link; The same-phase output pin of said second d type flip flop is connected with an end of said first switch, and the other end of said first switch is connected on the triggering signal pin of said first d type flip flop;
The said second local oscillation signal generation unit comprises switch, first d type flip flop and tail d type flip flop; The triggering signal pin of said first d type flip flop is connected with the same-phase output pin of second d type flip flop of the said first local oscillation signal generation unit; The same-phase output pin of said first d type flip flop is connected with the triggering signal pin of tail trigger; The same-phase output pin of said tail d type flip flop is connected with an end of said switch, and the other end of said switch is connected with the triggering signal pin of first d type flip flop of the said first local oscillation signal generation unit;
The clock signal pin of said first d type flip flop, said second d type flip flop, said first d type flip flop and said tail d type flip flop all is connected with said clock.
9. harmonic wave according to claim 8 suppresses circuit; It is characterized in that; The d type flip flop of the d type flip flop of the said first local oscillation signal generation unit and the said second local oscillation signal generation unit add up to 2m, the quantity of said switch is m, said m is a positive integer.
10. suppress circuit according to right 8 described harmonic waves; It is characterized in that; First d type flip flop with i local oscillation signal generation unit is an i d type flip flop, and the triggering signal pin of said i d type flip flop is connected with second input of the low-converter of i road active link.
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