CN101860373B - Circuit and method for eliminating interference for receptor - Google Patents
Circuit and method for eliminating interference for receptor Download PDFInfo
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- CN101860373B CN101860373B CN 200910134917 CN200910134917A CN101860373B CN 101860373 B CN101860373 B CN 101860373B CN 200910134917 CN200910134917 CN 200910134917 CN 200910134917 A CN200910134917 A CN 200910134917A CN 101860373 B CN101860373 B CN 101860373B
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Abstract
The invention discloses a circuit and a method for eliminating interference for a receptor. The circuit and the method can be used for reducing the strength of an adjoint interference signal and an image signal greatly at the front end of a wireless communication system receptor. The circuit for eliminating the interference comprises a down converter for transloading an input signal at a direct current frequency to generate a down converting signal; a first path circuit for processing the down converting signal to generate a first output signal, wherein the first output signal comprises a transmission signal and the interference signal; a second patch circuit for processing the down converting signal to generate a second output signal, wherein the second output signal only comprises the interference signal; and a mixer for mixing the first output signal and the second output signal to generate an output signal.
Description
Technical field
The present invention relates to a kind of interference cancellation circuit, espespecially a kind of interference cancellation circuit and the method that can implement to an input signal interference elimination.The front end that this input signal ties up to a radio communication system receiver is received, and it comprises a signal transmission and at least one interference signal of following.When this input signal follow interference signal to be better than this signal transmission the time, will make low noise amplifier (Low Noise Amplifier; LNA) become saturated, thereby destroy this signal transmission.
Background technology
For describing correlation technique of the present invention, the annexation between the LNA of a typical radio receiver and other parts is first in this explanation.Please refer to Fig. 1 a, it is the framework of a typical radio receiver.As shown in Figure 1a, this typical radio receiver comprises low noise amplifier 101, a power detecting device 102, a mixer 103, a local oscillator 104, a mixer 105, a mixer 106, a quadrature phase local oscillator 107, a composite filter 108 of a gain adjustable, amplifier 109, an automatic gain controller 110 and an analog-digital converter 111 of a gain adjustable at least.
Because amplifier 109, automatic gain controller 110 and the analog-digital converter 111 of this mixer 103, local oscillator 104, mixer 105, mixer 106, quadrature phase local oscillator 107, composite filter 108, gain adjustable all belongs to known skill and non-emphasis of the present invention, therefore not in this elaboration.
The low noise amplifier 101 of this gain adjustable is to amplify an input signal, and this input signal comprises a signal transmission and interference signal that some are possible.This power detecting device 102 is coupled to the low noise amplifier 101 of this gain adjustable, in order to adjust the gain of the low noise amplifier 101 of this gain adjustable according to the power of this input signal.If this input signal contains interference signal, it is better than this signal transmission usually, and this power detecting device 102 can detect a larger power and then send a signal with the gain of the low noise amplifier 101 that reduces this gain adjustable, and is saturated in order to prevent.Yet the gain reduction of the low noise amplifier 101 of this gain adjustable can make noise figure increase.The noise tolerance of typical radio receiver is usually limited, will the account for noise figure quota of other parts of receiver of the noise figure that the low noise amplifier 101 of this gain adjustable increases.So the noise figure of needing badly low noise amplifier reduces to move out the noise figure space for other component configuration of receiver.
Known in order to remove may interference signal solution insert a surface acoustic wave filter (SAW filter) before tying up to low noise amplifier.Please refer to Fig. 2, it is the calcspar of a known input signal interference cancellation techniques.As shown in Figure 2, this known techniques has low noise amplifier 202, a power detecting device 203 and a mixer 204 of a surface acoustic wave filter 201, a gain adjustable.
This surface acoustic wave filter 201 is in order to these interference signals of filtering.Yet the employing of this surface acoustic wave filter 201 can occupy extra board area, increase extra cost of parts, and the insertion loss of surface acoustic wave filter can cause noise figure deteriorated.
Known another arranges one second path in order to the solution system of removing interference signal, and it has a band stop filter to keep these interference signals, and then its output is subtracted each other with the output of low noise amplifier again.Please refer to Fig. 3, it illustrates another known interference cancellation techniques---the calcspar of feedforward (feed-forward) technology.As shown in Figure 3, this feed-forward technique has a low noise amplifier 301, a radio frequency band stop filter 302, a subtracter 303 and an amplifier 304.
This radio frequency band stop filter 302 is in order to this signal transmission of filtering and keeps these interference signals, and these interference signals are mixed to cancelling each other at this subtracter 303 with the contained interference signal of these low noise amplifier 301 outputs after this amplifier 304 amplifies.Yet this two path is because of the phase pushing figure difference of structure due to asymmetric, so that disturb eradicating efficacy not remarkable.Moreover high-quality radio-frequency filter is difficult to be implemented on the chip, even if be implemented on the chip, and the sensitivity that its high insertion loss that produces also can obvious deteriorated receiver.
Known another arranges one second path in order to the solution system of removing interference signal, and it has two mixers and a high pass filter only keeping these interference signals, and then subtracts each other with the output of low noise amplifier.Please refer to Fig. 4, it illustrates another known interference cancellation techniques---the calcspar of translation ring (translational-loop) technology.As shown in Figure 4, this translation loop technique has a low noise amplifier 401, a mixer 402, a high pass filter 403, a mixer 404 and a subtracter 405.
This mixer 402, high pass filter 403 and mixer 404 are associated and act as a radio frequency band stop filter with this signal transmission of filtering and keep these interference signals, export contained interference signal with this low noise amplifier 401 more afterwards and mix to cancelling each other at this subtracter 405.Yet this mixer 402 and mixer 404 can produce extra image signal, and this two path is because of the different phase pushing figure of the asymmetric tool of structure, so that disturb eradicating efficacy limited.Therefore, need a technology badly, it can be in succinct structure, cheaply under the condition, provides superior interference eradicating efficacy at the front end of wireless receiver.
Summary of the invention
Technical problem to be solved by this invention provides circuit and the method that a kind of elimination for receiver is disturbed, can be in order to significantly to reduce the intensity of following interference signal and image signal at the radio communication system receiver front end.
In order to solve above technical problem, the invention provides following technical scheme:
The invention provides a kind of circuit that disturbs of eliminating for receiver, can carry out the interference of an input signal eliminates, this input signal system is stated from a transmission carrier frequency and comprises a signal transmission and at least one interference signal, this interference cancellation circuit has: a down converter, in order to this input signal by this transmission carrier frequency reprint to direct current frequency to produce a down converting signal; One first path circuit, in order to process this down converting signal to produce one first output signal, wherein this first output signal comprises this signal transmission and these interference signals; One second path circuit, in order to process this down converting signal to produce one second output signal, wherein this second output signal comprises these interference signals but does not comprise this signal transmission; And a blender, in order to by mixing this first output signal and this second output signal to produce an output signal.
The present invention also provides a kind of method of eliminating interference, be used for a receiver, carrying out the interference of an input signal eliminates, wherein this input signal system is stated from a transmission carrier frequency and comprises a signal transmission and at least one interference signal, and the method comprises: with this input signal by this transmission carrier frequency reprint to direct current frequency to produce a down converting signal; Process this down converting signal to produce one first output signal, wherein this first output signal comprises this signal transmission and this at least one interference signal; Process this down converting signal to produce one second output signal, wherein this second output signal comprises these interference signals but does not comprise this signal transmission; Reach this first output signal of mixing and this second output signal to produce an output signal.
Circuit and method that the elimination that is used for receiver that the present invention adopts is disturbed, disturb the elimination design point to be that this first output signal comprises a signal component and an interference component, this second output signal comprises another interference component, and the interference component of this first output signal is not to equate to be exactly complementary fully with the interference component of this second output signal, and can when mixing, cancel each other, thereby can eliminate at the receiver front end of wireless communication system the interference of an input signal, this input signal comprises a signal transmission and at least one interference signal of following; Also can effectively eliminate according to a frequency translation scheme and a symmetrical dual path framework interference signal of following of a signal transmission, significantly reduce the intensity of following interference signal and image signal at the radio communication system receiver front end.
Description of drawings
Fig. 1 a is the calcspar of a typical radio receiver.
Fig. 1 b is the schematic diagram of the operation principle of a mixer.
Fig. 2 is the calcspar of a known interference cancellation techniques.
Fig. 3 is the calcspar of another known interference cancellation techniques.
Fig. 4 is the calcspar of another known interference cancellation techniques.
Fig. 5 is the preferred embodiment calcspar that the present invention is used to eliminate interference.
Fig. 6 is another preferred embodiment calcspar that the present invention is used to eliminate interference.
Fig. 7 is another preferred embodiment calcspar that the present invention is used to eliminate interference.
Fig. 8 is another preferred embodiment calcspar that the present invention is used to eliminate interference.
[primary clustering symbol description]
The low noise amplifier 101,202 of gain adjustable
Power detecting device 102,203
Mixer 103,105,106,204,402,404,502,504,506,602,604,606,702,704,706,803,804,806,808
Local oscillator 104,501,601,701
Quadrature phase local oscillator 107,801,802
The amplifier 109 of gain adjustable
Analog-digital converter 111
Surface acoustic wave filter 201
Low noise amplifier 301,401
Radio frequency band stop filter 302
Subtracter 303,405
High pass filter 403,605,705
Low pass filter 503,603,805
Band pass filter 505,807
All-pass filter 703
Blender 507,607,707,809,810
Embodiment
In wireless communication field, with a mixer to a signal cos (2 π f
sT) and a frequency be f
cCarrier wave cos (2 π f
cT) implement frequency inverted, its mathematical expression can be shown (the 2 π f into cos
sT) * cos (2 π f
cT)=(1/2) { cos (2 π (f
c+ f
s) t)+cos (2 π (f
c-f
s) t), that is frequency is f
sSignal can be converted to frequency be f
c-f
sSwitching signal and frequency be f
c+ f
sImage signal.Suppose that it is f that an input signal comprises a frequency
TrSignal transmission cos (2 π f
TrT) and frequency be f
IntInterference signal cos (2 π f
IntT), and this input signal by a mixer take a frequency as f
cCarrier wave cos (2 π f
cT) implement frequency inverted.Its result is shown in Fig. 1 b, and will produce frequency is f
c-f
Tr, f
c-f
Int, f
c+ f
Tr, f
c+ f
IntFour switching signals.
As described in previous correlation technique, radio-frequency filter is difficult for that high-quality is arranged on the chip of feed-forward technique, so translation ring (translational loop) technology proposes with mixer signal to be fallen first before implementing filtering and goes to a low frequency.This measure will make high-quality core plate upper filter easy to implement.Yet because mixer can produce relevant image signal, and the structure in dqm signal path is asymmetric, so that disturb the effect of eliminating not remarkable.The solution of a novelty overcomes design of filter and image signal is eliminated the thorny problem that involves so need badly.
For solving this thorny problem, the present invention at first proposes a symmetrical dual path structure.Then, the present invention sets about processing the signal spectrum in this symmetric double path, so that the signal spectrum composition of the signal spectrum composition of its first path output and its second path output is only variant at the frequency location of signal transmission.This first path keeps then this signal transmission of filtering of this second path of this signal transmission.For frequency spectrum processing is easily reached, filter should be carried out in low-frequency band.Then, after being returned to original frequency band, interference signal can be by eliminating in conjunction with the output in this two path.The aforesaid motion of the present invention means:
A) need a mixer that the input signal frequency reducing is converted to the design that direct current frequency is sentenced sharp filter, and need another mixer with the filtering signal up-conversion;
B) filter in this first path need be designed to keep this signal transmission and one group of interference signal, and the filter in this second path need be designed to keep this group interference signal and this signal transmission of filtering; And
C) image signal that produces of the mixer in this two path all is mutually symmetrical, therefore can eliminate by subtracting each other.
For reaching these targets, the present invention at first utilizes a local oscillator to produce the frequency of oscillator signal, is the carrier frequency of input signal.This oscillator signal can be coupled to these mixers to carry out frequency reducing and up-conversion.Adopt this frequency of oscillation can produce two advantages, at first, can be in the easy high quality filter that realizes of low-frequency band design, secondly, two same frequencys subtract each other the direct current frequency position that produces can derive less image signal.
About the design of filter in this two path, its gain answers its phase deviation of interference signal that keeps in identical and this two path to approach as far as possible.As is generally known, in the design of filter field, the phase response of low pass filter, band pass filter, high pass filter and all-pass filter is not identical, therefore the correlation filter passband in this two path should be according to the possible frequency location adjustment of interference signal, so that the phase deviation of interference signal in this two path approaches as far as possible.General wave filter technology such as Butterworth (Butterworth) filter can be in order to realize this design.
Moreover its pattern of signal path of the present invention can be the combination of single-ended mode or differential mode or single-ended mode and differential mode.The aforesaid concept of the present invention can produce many versions through modification.Specification of the present invention will disclose some preferred embodiments.
Please refer to Fig. 5, it is for a preferred embodiment calcspar of interference cancellation circuit of the present invention.As shown in Figure 5, this calcspar comprises a local oscillator 501, a mixer 502, a low pass filter 503, a mixer 504, a band pass filter 505, a mixer 506 and a blender 507.
In this embodiment, this local oscillator 501 is to produce an oscillator signal, and its frequency is the carrier frequency of an input signal.This input signal comprises a signal transmission and at least one interference signal.The signal path of this local oscillator 501 is differential mode, and its kenel is single-phase.
This mixer 502 is in order under the control of this oscillator signal, produces according to this input signal to be stated from one first of direct current frequency position and to turn frequently signal, and is stated from one second of direct current frequency position and turns frequently signal.
This low pass filter 503 is a second order Butterworth LPF, first turns frequently signal in order to process this, to keep one first filtering signal.The passband frequency range system of this filter is adjusted according to the possible position of interference signal and image signal, and signal is retained in one first path and interference signal is retained in one first path so that this first filtering signal comprises.For example, if comprising one, this input signal is stated from 900MH
ZSignal transmission and be stated from 1000MH
ZInterference signal, then after the processing of this mixer 502, will have four outputs, it is stated from respectively direct current frequency, 100MH
Z, 1800MH
ZAnd 1900MH
ZIn this situation, the passband of this low pass filter 503 can be designed to be stated from this signal transmission of direct current frequency and be stated from 100MH in order to reservation
ZThis interference signal.
This mixer 504 is in order under the control of this oscillator signal, produces one first output signal that is stated from this first carrier frequency according to this first filtering signal.This first output signal comprises a plurality of the first path interference signals, and is proportional to one first output signal of this signal transmission.
This band pass filter 505 is a second order Butterworth band pass filter, second turns signal frequently is stated from this second carrier frequency with reservation one second filtering signal in order to process this.The passband frequency range system of this filter is adjusted according to the passband frequency range of this low pass filter 503, retain interference signal so that this second filtering signal comprises one second path, wherein the spectrum distribution of interference signal is retained close to the spectrum distribution of this first path retention interference signal in this second path.For example, because having kept, this low pass filter 503 is stated from 100MH
ZInterference signal, be stated from 100MH therefore this band pass filter 505 should only keep
ZInterference signal, and its passband should be adjusted to make and is stated from 100MH
ZAmplitude and the phase place of this two interference signal approximately equal.
This mixer 506 is in order under the control of this oscillator signal, produces one second output signal according to this second filtering signal.This second output signal comprises the interference signal in this second path, and its spectrum distribution of interference signal in this second path is similar to the tool person of interference signal institute in this first path.
This blender 507 is with so that this second output signal and this first output signal subtract each other to produce an output signal, and wherein this output signal is proportional to this first output signal.
Please refer to Fig. 6, it is for another preferred embodiment calcspar of interference cancellation circuit of the present invention.As shown in Figure 6, this calcspar comprises a local oscillator 601, a mixer 602, a low pass filter 603, a mixer 604, a high pass filter 605, a mixer 606 and a blender 607.
In this embodiment, this local oscillator 601 is to produce an oscillator signal, and its frequency is the carrier frequency of an input signal.This input signal comprises a signal transmission and at least one interference signal.The signal path of this local oscillator 601 is differential mode.
This mixer 602 is in order under the control of this oscillator signal, produces according to this input signal to be stated from one first of direct current frequency position and to turn frequently signal, and is stated from one second of direct current frequency position and turns frequently signal.
This low pass filter 603 is a second order Butterworth LPF, first turns frequently signal to keep one first filtering signal in order to process this.The passband frequency range system of this filter is adjusted according to the possible position of interference signal and image signal, and signal is retained in one first path and interference signal is retained in one first path so that this first filtering signal comprises.For example, if comprising one, this input signal is stated from 900MH
ZSignal transmission and be stated from 1000MH
ZInterference signal, then after the processing of this mixer 602, will have four outputs, it is stated from respectively direct current frequency, 100MH
Z, 1800MH
ZAnd 1900MH
ZIn this situation, the passband of this low pass filter 603 can be designed to keep this four outputs.
This mixer 604 is in order under the control of this oscillator signal, produces one first output signal that is stated from this first carrier frequency according to this first filtering signal.This first output signal comprises a plurality of the first path interference signals, and is proportional to one first output signal of this signal transmission.
This high pass filter 605 is a second order butterworth high pass filter, second turns signal frequently is stated from this second carrier frequency with reservation one second filtering signal in order to process this.The passband frequency range system of this high pass filter 605 is adjusted according to the passband frequency range of this low pass filter 603, retain interference signal so that this second filtering signal comprises one second path, wherein the spectrum distribution of interference signal is retained close to the spectrum distribution of this first path retention interference signal in this second path.For example, because this low pass filter 603 has kept this four outputs, therefore this high pass filter 605 should a filtering be stated from this signal transmission of direct current frequency, and its passband should be adjusted to make and is stated from 100MH
ZInterference signal and be stated from 1800MH
Z, 1900MH
ZIts amplitude of image signal and phase place approximate this low pass filter 603 its corresponding output tool persons of institute.
This mixer 606 is in order under the control of this oscillator signal, produces one second output signal according to this second filtering signal.This second output signal comprises the interference signal in this second path, and its spectrum distribution of interference signal in this second path is similar to the tool person of interference signal institute in this first path.
This blender 607 is with so that this second output signal and this first output signal subtract each other to produce an output signal, and wherein this output signal is proportional to this first output signal.
Please refer to Fig. 7, it is for another preferred embodiment calcspar of interference cancellation circuit of the present invention.As shown in Figure 7, this calcspar comprises a local oscillator 701, a mixer 702, an all-pass filter 703, a mixer 704, a high pass filter 705, a mixer 706 and a blender 707.
In this embodiment, this local oscillator 701 is to produce an oscillator signal, and its frequency is the carrier frequency of an input signal.This input signal comprises a signal transmission and at least one interference signal.The signal path of this local oscillator 701 is differential mode, and its kenel is single-phase.
This mixer 702 is in order under the control of this oscillator signal, produces according to this input signal to be stated from one first of direct current frequency position and to turn frequently signal, and is stated from one second of direct current frequency position and turns frequently signal.
This all-pass filter 703 is a second order Butterworth all-pass filter, first turns frequently signal to keep one first filtering signal in order to process this.This first filtering signal comprises one first path and retains signal and one first path retention interference signal.
This mixer 704 is in order under the control of this oscillator signal, produces one first output signal that is stated from this first carrier frequency according to this first filtering signal.This first output signal comprises a plurality of the first path interference signals, and is proportional to one first output signal of this signal transmission.
This high pass filter 705 is a second order butterworth high pass filter, second turns signal frequently is stated from this second carrier frequency with reservation one second filtering signal in order to process this.The passband frequency range system of this high pass filter 705 is adjusted according to the possible frequency location of these interference signals and image signal, retain interference signal so that this second filtering signal comprises one second path, wherein the spectrum distribution of interference signal is retained close to the spectrum distribution of this first path retention interference signal in this second path.For example, if comprising one, this input signal is stated from 900MH
ZSignal transmission and be stated from 1000MH
ZInterference signal, then after the processing of this mixer 702, will have four outputs, it is stated from respectively direct current frequency, 100MH
Z, 1800MH
ZAnd 1900MH
ZBecause this all-pass filter 703 has kept this four outputs, therefore this high pass filter 705 should a filtering be stated from this signal transmission of direct current frequency, and its passband frequency range should be adjusted to make and is stated from 100MH
ZInterference signal and be stated from 1800MH
Z, 1900MH
ZIts amplitude of image signal and phase place approximate this all-pass filter 703 its corresponding output tool persons of institute.
This mixer 706 is in order under the control of this oscillator signal, produces one second output signal according to this second filtering signal.This second output signal comprises a plurality of the second path interference signals, and these the second path its spectrum distribution of interference signal are similar to a plurality of the first tool persons of path interference signal institute.
This blender 707 is with so that this second output signal and this first output signal subtract each other to produce an output signal, and wherein this output signal is proportional to this first output signal.
Please refer to Fig. 8, it is for another preferred embodiment calcspar of interference cancellation circuit of the present invention.The present embodiment is except adopting quadrature phase (0 °/90 °) structure, and its principle is inherited previous several embodiment.As shown in Figure 8, this calcspar comprises a local oscillator 801, a local oscillator 802, a mixer 803, a low pass filter 804, a mixer 805, a mixer 806, a band pass filter 807, a mixer 808, a blender 809 and a blender 810.
In this embodiment, this local oscillator 801 is the first oscillator signal that produces a pair of tool quadrature phase, and its frequency is the carrier frequency of an input signal.This first oscillator signal to the tool quadrature phase comprises the oscillator signal of one 0 ° of phase places and the oscillator signal of one 90 ° of phase places.This input signal comprises a signal transmission and at least one interference signal.The signal path of this local oscillator 801 is differential mode.
This local oscillator 802 is the second oscillator signal that produces a pair of tool quadrature phase, and its frequency is the carrier frequency of an input signal.The signal path of this local oscillator 802 is differential mode.
This mixer 803 is in order under this control to the first oscillator signal of tool quadrature phase, produces first of a pair of tool quadrature phase that is stated from one second carrier frequency according to this input signal and turns frequently signal.
This mixer 804 is in order under this control to the first oscillator signal of tool quadrature phase, produces second of a pair of tool quadrature phase that is stated from this second carrier frequency according to this input signal and turns frequently signal.
This low pass filter 805 is to process this first of tool quadrature phase is turned the frequency signal to keep the first filtering signal of a pair of tool quadrature phase.This first filtering signal to the tool quadrature phase comprises the first path retention signal of a pair of tool quadrature phase and interference signal is retained in the first path of a pair of tool quadrature phase.
This mixer 806 is in order under this control to the second oscillator signal of tool quadrature phase, the first filtering signal of tool quadrature phase is produced the first output signal of a pair of tool quadrature phase that is stated from this first carrier frequency according to this.This first output signal to the tool quadrature phase comprises the first path interference signal of a pair of tool quadrature phase, and the first output signal of a pair of tool quadrature phase, and wherein this phase signal to the first output signal of tool quadrature phase is proportional to this signal transmission.
This band pass filter 807 is to process this second of tool quadrature phase is turned the frequency signal is stated from a pair of tool quadrature phase of this second carrier frequency with reservation the second filtering signal.This second filtering signal to the tool quadrature phase comprises the second path of a pair of tool quadrature phase and retains interference signal, and wherein this spectrum distribution system to second path retention interference signal of tool quadrature phase retains the spectrum distribution of interference signal according to this first path to the tool quadrature phase and determines.
This mixer 808 is in order under this control to the second oscillator signal of tool quadrature phase, produces the second output signal of a pair of tool quadrature phase according to this second filtering signal to the tool quadrature phase.This second output signal to the tool quadrature phase comprises the second path interference signal of a pair of tool quadrature phase, and this its spectrum distribution system of the second path interference signal to the tool quadrature phase determines the spectrum distribution of the first path interference signal of tool quadrature phase according to this, so that amplitude each other and phase place all can be mated.
This blender 809 and blender 810 are with so that this subtracts each other to produce the output signal of a pair of tool quadrature phase to the second output signal of tool quadrature phase and this to the first output signal of tool quadrature phase, and wherein this output signal to the tool quadrature phase is proportional to this to the first output signal of tool quadrature phase.
In the above several preferred embodiment, if its filtering signal by further anti-phase, then its blender also can utilize addition to reach disturb to eliminate.
This case those disclosed herein are preferred embodiment, such as local change or modification and come from the technological thought of this case and be easy to the person of knowing by inference by the people who has the knack of this skill, all categories that does not take off this patent.
Claims (10)
1. a circuit of eliminating interference is used for a receiver, carries out the interference of an input signal and eliminates, and wherein this input signal system is stated from a transmission carrier frequency and comprises a signal transmission and at least one interference signal, it is characterized in that, this circuit comprises:
One down converter, in order to this input signal by this transmission carrier frequency reprint to direct current frequency to produce a down converting signal;
One first path circuit, in order to process this down converting signal to produce one first output signal, wherein this first output signal comprises this signal transmission and this at least one interference signal;
One second path circuit, in order to process this down converting signal to produce one second output signal, wherein this second output signal comprises this interference signal but does not comprise this signal transmission; And
One blender is in order to by mixing this first output signal and this second output signal to produce an output signal;
Wherein, this first path circuit comprises:
One first filter is in order to process this down converting signal to produce one first filtering signal; And
One first upconverter, in order to this first filtering signal by direct current frequency reprint to this transmission carrier frequency producing this first output signal, and wherein this second path circuit comprises:
One second filter, in order to process this down converting signal to produce one second filtering signal, wherein this second filtering signal does not contain this signal transmission; And
One second upconverter, in order to this second filtering signal by direct current frequency reprint to this transmission carrier frequency to produce this second output signal.
2. the circuit of elimination interference as claimed in claim 1 is characterized in that, it further has a local oscillator, in order to produce an oscillator signal to drive this down converter.
3. the circuit of elimination interference as claimed in claim 1 is characterized in that, it further has a local oscillator, in order to produce an oscillator signal to drive this first upconverter and this second upconverter.
4. the circuit of elimination interference as claimed in claim 1 is characterized in that, this blender is by carrying out one of subtraction or add operation, in order to mix this first output signal and this second output signal.
5. the circuit of elimination interference as claimed in claim 1 is characterized in that, this first filter is that a low pass filter and this second filter are a band pass filter.
6. the circuit of elimination interference as claimed in claim 1 is characterized in that, this first filter is that a low pass filter and this second filter are a high pass filter.
7. the circuit of elimination interference as claimed in claim 1 is characterized in that, this first filter is that an all-pass filter and this second filter are a high pass filter.
8. the circuit that disturbs of elimination as claimed in claim 1 is characterized in that, the signal mode of this down converter be single-ended mode or differential mode or single-ended mode and differential mode in conjunction with one of among the three.
9. the circuit that disturbs of elimination as claimed in claim 2 is characterized in that, the signal mode of this local oscillator be single-phase mode or quadrature phase pattern or single-phase mode and quadrature phase pattern in conjunction with one of among the three.
10. a method of eliminating interference is used for a receiver, carries out the interference of an input signal and eliminates, and wherein this input signal system is stated from a transmission carrier frequency and comprises a signal transmission and at least one interference signal, it is characterized in that, the method comprises:
With this input signal by this transmission carrier frequency reprint to direct current frequency to produce a down converting signal;
Process this down converting signal to produce one first output signal, wherein this first output signal comprises this signal transmission and this at least one interference signal;
Process this down converting signal to produce one second output signal, wherein this second output signal comprises this interference signal but does not comprise this signal transmission; And
Mix this first output signal and this second output signal to produce an output signal;
Wherein processing this down converting signal comprises with the step that produces one first output signal:
Process this down converting signal to produce one first filtering signal; And
With this first filtering signal by direct current frequency reprint to this transmission carrier frequency producing this first output signal, and wherein process this down converting signal and comprise to produce one second output signal:
Process this down converting signal to produce one second filtering signal, wherein this second filtering signal does not contain this signal transmission; And
With this second filtering signal by direct current frequency reprint to this transmission carrier frequency to produce this second output signal.
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|---|---|---|---|
| CN 200910134917 CN101860373B (en) | 2009-04-10 | 2009-04-10 | Circuit and method for eliminating interference for receptor |
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|---|---|---|---|
| CN 200910134917 CN101860373B (en) | 2009-04-10 | 2009-04-10 | Circuit and method for eliminating interference for receptor |
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| CN101860373B true CN101860373B (en) | 2013-03-06 |
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| CN102437859A (en) * | 2011-11-08 | 2012-05-02 | 天津理工大学 | Radio frequency front end anti-interference circuit of wireless communication receiver |
| CN104617970B (en) * | 2015-02-10 | 2017-02-22 | 东南大学 | Fully-integrated anti-blocking radio frequency receiving front-end architecture |
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| CN101860373A (en) | 2010-10-13 |
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