CN100411312C - Radio-frequency receiver and radio frequency receiving method - Google Patents
Radio-frequency receiver and radio frequency receiving method Download PDFInfo
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- CN100411312C CN100411312C CNB2005100819131A CN200510081913A CN100411312C CN 100411312 C CN100411312 C CN 100411312C CN B2005100819131 A CNB2005100819131 A CN B2005100819131A CN 200510081913 A CN200510081913 A CN 200510081913A CN 100411312 C CN100411312 C CN 100411312C
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Abstract
The radio frequency receiver includes a unit for descending frequency, a harmonic filtration unit, a first ascending frequency unit, and a second ascending frequency unit. Receiving a signal in radio frequency, the unit for descending frequency lowers the radio frequency to first frequency so as to generate first in-phase signal and first orthogonal signal. Being coupled to the descending unit, the harmonic filtration unit carried out killer amplification for the received first in-phase and orthogonal signals so as to generate second in-phase and orthogonal signals. Being coupled to the harmonic filtration unit, the first ascending frequency unit raises the received second in-phase and orthogonal signals to a second frequency so as to generate third in-phase and orthogonal signals. Being coupled to the first ascending frequency unit, the second ascending frequency unit raises third in-phase and orthogonal signals to a third frequency so as to generate an intermediate frequency signal.
Description
Technical field
The present invention relates to a kind of radio-frequency (RF) transceiver, particularly a kind of frequency reducing and raising frequency circuit integrated is to simplify the radio frequency receiver of hardware designs.
Background technology
Fig. 1 a is the Organization Chart of existing reflector.The fundamental frequency digital signal of handling by digital signal processor 110, be divided into homophase (I) and the parallel processing of quadrature (Q) two-way, convert the fundamental frequency analog signal to via digital/analog converter 102, then by low pass filter 104 filter away high frequency noise compositions, stay fundamental frequency signal, before entering modulation, carry out power integration by variable gain amplifier 106.Afterwards, frequency mixer 108 is modulated by 130 pairs of these fundamental frequency analog signals of source oscillation signal, with this fundamental frequency analog signal raising frequency to radiofrequency signal.The last amplitude limit amplification of carrying out radiofrequency signal again with limiting amplifier 140 with the image frequency signal that radio-frequency filter 150 filterings modulation back produces, with power amplifier 160 amplifying powers, is launched from antenna 120.
Fig. 1 b is the Organization Chart of existing homostrobe device (homodyne receiver).The signal receiving course is opposite with emission process haply.After antenna 120 received RF signals, filter radiofrequency signal noise in addition through radio-frequency filter 150.Then pass through low noise amplifier 114 amplifying signals again, carry out demodulation with frequency mixer 108.This frequency mixer 108 is fundamental frequency signal according to the oscillator signal that source oscillation signal 130 produces with the direct frequency reducing of radiofrequency signal, is divided into homophase and quadrature two-way, parallel processing.Low pass filter 104 is with the image frequency composition filtering in this fundamental frequency signal, stay the fundamental frequency composition, then adjust amplitude, be converted to the fundamental frequency digital signal, export digital signal processor 110 at last to for subsequent applications by analog/digital converter 112 by variable gain amplifier 106.Homodyne (ZIF) framework is called direct converting structure (DirectConversion) again, can directly radiofrequency signal be reduced to fundamental frequency signal, relatively is not easy to take place the problem that image frequency is disturbed.But the image frequency composition is directly dropped to fundamental frequency, forms direct current offset (DC Offset), influences the signal of follow-up digital signal processor 110.Solution is eliminated the loop except using skew, also can use the Low Medium Frequency framework (VLIF) that is widely known by the people instead.
Fig. 1 c is the Organization Chart of existing Low Medium Frequency receiver.Different with Fig. 1 b is in the demodulating process of frequency mixer 108, to be not that radiofrequency signal is reduced to fundamental frequency, but to reduce to a low-frequency range near fundamental frequency.Usually 1/4th places of this low frequency meeting selector channel width (channel spacing) for example are 150KHz to the PHS system.Resulting low frequency signal is again with band pass filter 105 filtering image frequency noises, and staying this low frequency is main composition.Compared to existing super-heterodyne architecture or homodyne framework, the Low Medium Frequency framework has high degree of integration, has avoided the problem of direct current offset, can be applicable to general narrowband communication system, for example GSM.In addition, the signal strength signal intensity of Low Medium Frequency framework can be higher than the homodyne framework.
Yet,, make homodyne or Low Medium Frequency framework can't be applied in the system that needs intermediate-freuqncy signal, for example PHS because radiofrequency signal is directly reduced to fundamental frequency or low frequency at the signal receiving course.Though and the exportable intermediate-freuqncy signal of super-heterodyne architecture is complicated because of the real work of surface acoustic wave (SAW) filter, can't be incorporated in the one chip.Therefore for various advantages all can be had both, the framework with conformability is untapped.
Summary of the invention
One of embodiments of the invention provide a radio frequency receiver, comprise a frequency reducing unit, a harmonic filtration unit, one first raising frequency unit, and one second raising frequency unit.This frequency reducing unit receives a radiofrequency signal, and with frequency down to a first frequency of this radiofrequency signal, produces one first in-phase signal and one first orthogonal signalling.This harmonic filtration unit couples this frequency reducing unit, receives this first in-phase signal and these first orthogonal signalling, and this first in-phase signal and these first orthogonal signalling are carried out the amplitude limit amplification, produces one second in-phase signal and one second orthogonal signalling.This first raising frequency unit couples this harmonic filtration unit, receives this second in-phase signal and these second orthogonal signalling, and with frequency raising frequency to a second frequency of this second in-phase signal and these second orthogonal signalling, produces one the 3rd in-phase signal and the 3rd orthogonal signalling.This second raising frequency unit couples this first raising frequency unit, receives the 3rd in-phase signal and the 3rd orthogonal signalling, and with frequency raising frequency to the 3rd frequency of the 3rd in-phase signal and the 3rd orthogonal signalling, produces an intermediate-freuqncy signal after the addition.
This radio frequency receiver further comprises an area oscillation device, comprises a derived reference signal, a phase-locked loop, one first frequency divider and one second frequency divider.This derived reference signal provides a reference signal.This phase-locked loop couples this derived reference signal, produces one first sinusoidal signal and one first cosine signal according to this reference signal, has a first frequency.This first frequency divider couples this derived reference signal, according to this reference signal, in the mode that numeral is tabled look-up, produces one second sinusoidal signal and one second cosine signal, has a second frequency.This second frequency divider couples this derived reference signal, produces one the 3rd sinusoidal signal and one the 3rd cosine signal according to this reference signal, has one the 3rd frequency.The rate of this reference signal is 19.2MHz frequently, and this first frequency is 1.75GHz, and this second frequency is 1.05MHz, and the 3rd frequency is 9.6MHz.
Another embodiment of the present invention provides a radio frequency receiving method, comprises the following step.At first receive a radiofrequency signal, and, produce one first in-phase signal and one first orthogonal signalling frequency down to a first frequency of this radiofrequency signal.Then this first in-phase signal and these first orthogonal signalling are carried out the amplitude limit amplification, produce one second in-phase signal and one second orthogonal signalling.At last, frequency raising frequency to a second frequency with this second in-phase signal and these second orthogonal signalling produces one the 3rd in-phase signal and the 3rd orthogonal signalling.With frequency raising frequency to the 3rd frequency of the 3rd in-phase signal and the 3rd orthogonal signalling, produce an intermediate-freuqncy signal after the addition.
Description of drawings
Fig. 1 a is the Organization Chart of existing direct raising frequency reflector;
Fig. 1 b is the Organization Chart of existing homostrobe device;
Fig. 1 c is the Organization Chart of existing Low Medium Frequency receiver;
Fig. 2 is the receiver architecture figure of one of embodiment of the invention;
Fig. 3 is the area oscillation device of one of embodiment of the invention;
Fig. 4 is the radio-frequency system of one of embodiment of the invention; And
Fig. 5 is the flow chart of radio frequency receiving method of the present invention.
The reference numeral explanation:
100 radiofrequency launchers, 101 homostrobe devices
102 digital/analog converters, 103 Low Medium Frequency receivers
104 low pass filters, 105 band pass filters
106 variable gain amplifiers, 108 frequency mixers
110 digital signal processors, 112 analog/digital converters
114 low noise amplifiers, 120 antennas
130 source oscillation signals, 140 limiting amplifiers
150 radio-frequency filters, 160 power amplifiers
200 radio frequency receivers, 202 frequency reducing unit
206 first raising frequency unit, 204 harmonic filtration unit
208 second raising frequency unit, 210 low noise amplifiers
212a-212b frequency mixer 214a-214b variable gain amplifier
216 multiphase filter 222a-222b limiting amplifiers
224 first multiphase filter 232a-232d frequency mixers
234a-234b adder 236 second multiphase filters
242a-242b frequency mixer 244 adders
246 band pass filters, 248 second limiting amplifiers
300 area oscillation devices, 302 phase-locked loops
304 derived reference signals, 306 first frequency dividers
308 second frequency dividers 310 remove two circuit
316 numerals, 326 digital/analog converters of tabling look-up
318 duty cycle correction unit 328 remove two circuit
The 320-330 amplifier
Embodiment
Fig. 2 is the receiver architecture figure of one of embodiment of the invention.In radio frequency receiver 200, comprise frequency reducing unit 202,204, the first raising frequency unit 206, harmonic filtration unit and the second raising frequency unit 208.Be input as radiofrequency signal RF, be output as intermediate-freuqncy signal IF.Low Medium Frequency is at first reduced to radiofrequency signal RF in this frequency reducing unit 202, produces the first in-phase signal I
1With the first orthogonal signalling Q
1In the present embodiment, this Low Medium Frequency is 150KHz.This first raising frequency unit 206 is with this first in-phase signal I
1With the first orthogonal signalling Q
1Raising frequency to one first intermediate frequency produces the 3rd in-phase signal I
3With the 3rd orthogonal signalling Q
3This first intermediate frequency is 1.2MHz in the present embodiment.This second raising frequency unit 208 is more further with the 3rd in-phase signal I
3With the 3rd orthogonal signalling Q
3Raising frequency is to intermediate-freuqncy signal IF.The frequency of this intermediate-freuqncy signal IF is 10.8MHz in the present embodiment.This harmonic filtration unit 204 is in order to the filtering first in-phase signal I
1With the first orthogonal signalling Q
1In the harmonic wave composition, avoid the first in-phase signal I
1With the first orthogonal signalling Q
1In the harmonic wave composition got on by the first raising frequency unit, 206 raising frequencies.These 202, the first raising frequency unit 206, frequency reducing unit and the second raising frequency unit 208 respectively need the local oscillation signal source of respective frequencies in order to carry out frequency reducing and raising frequency.Wherein this frequency reducing unit 202 receives one first sinusoidal signal sin ω
1T and one first cosine signal cos ω
1T carries out mixing and produces a mixing results this radiofrequency signal, and this mixing results is carried out power amplification and the filtering of image frequency composition, and obtains this first in-phase signal I
1With these first orthogonal signalling Q
1For instance, for the PHS system, radiofrequency signal RF is 1.9GHz, in order to produce the first in-phase signal I that frequency is 150KHz
1With the first orthogonal signalling Q
1, with this first sinusoidal signal sin ω
1The t and the first cosine signal cos ω
1The frequency setting of t is 1.75GHz, avoids the adjacent interference band frequently of PHS communication protocol standard by this.Then after the mixing frequency reducing via frequency mixer 212a and frequency mixer 212b, can produce the first in-phase signal I of 150KHz
1With the first orthogonal signalling Q
1In frequency reducing unit 202, variable gain amplifier 214a and 214b and multiphase filter 216 (polyphase filter) are existing assemblies, purpose is the image frequency signal that produces in the filtering demodulating process, and promptly so-called image frequency suppresses (Image Rejection).
Comprise one group of limiting amplifier 222a and 222b in the harmonic filtration unit 204, to the first in-phase signal I
1And the first orthogonal signalling Q
1Carry out amplitude limit and amplify, make amplitude signal unique, but do not miss phase signal.First multiphase filter 224 is then in order to this first in-phase signal I after amplitude limit is amplified
1With these first orthogonal signalling Q
1In the filtering of harmonic wave composition, then export next stage subsequently to.Because harmonic filtration unit 204 contents belong to existing standard, do not add detailed description at this.
This first raising frequency unit 206 comprises four frequency mixer 232a-232d, two adders 234 and one second multiphase filter 236.The purpose of these four frequency mixer 232-232d is to utilize suitable addition to subtract each other to cause image frequency signal to disappear mutually.Because be to utilize signal plus to cause image frequency to eliminate, but not go design at specific frequency, the image frequency that the mode that therefore this image frequency suppresses can be reached relative broad range suppresses.For with the second in-phase signal I
2With the second orthogonal signalling Q
2Raising frequency is the 3rd in-phase signal I of frequency 1.2MHz
3With the 3rd orthogonal signalling Q
3, the second cosine signal cos ω that is received
2The t and the second sinusoidal signal sin ω
2T is set to the frequency with 1.05MHz.This first frequency mixer 232a with this second with believing I
2With this second cosine signal cos ω
2The t mixing.This second frequency mixer 232b is with this second in-phase signal I
2With this second sinusoidal signal sin ω
2The t mixing.This three-mixer 232c is with these second orthogonal signalling Q
2With this second sinusoidal signal sin ω
2The t mixing.The 4th frequency mixer 232d is with these second orthogonal signalling Q
2With this second cosine signal cos ω
2The t mixing.Then first adder 234a deducts the mixing results of this first frequency mixer 232a the mixing results of this three-mixer 232c.And second adder 234b is with the mixing results of mixing results addition the 4th frequency mixer 232d of this second frequency mixer 232b.The addition result of subtracting each other result and this second adder 234b of 236 pairs of these first adders of the second last multiphase filter 234a is carried out multiphase filtering, produces the 3rd in-phase signal I
3With the 3rd orthogonal signalling Q
3
In the present embodiment, the 3rd in-phase signal I
3With the 3rd orthogonal signalling Q
3Frequency be 1.2MHz, and these second raising frequency unit, 208 receive frequencies are the 3rd cosine signal cos ω of 9.6MHz
3T and the 3rd sinusoidal signal sin ω
3T, mixing produces the intermediate-freuqncy signal IF of frequency 10.8MHz.Comprise one the 5th frequency mixer 242a in this second raising frequency unit 208, with the 3rd in-phase signal I
3With the 3rd cosine signal cos ω
3T mixing, and one the 6th frequency mixer 242b are with the 3rd in-phase signal I
3With the 3rd sinusoidal signal sin ω
3The t mixing.Then one the 3rd adder 244 is with the mixing results addition of the 5th frequency mixer 242a and the 6th frequency mixer 242b, and the addition result of 246 pairs the 3rd adders 244 of a band pass filter is carried out bandpass filtering, and staying the 3rd frequency is main composition.This second raising frequency unit 208 still comprises one second limiting amplifier 248, amplitude limit is carried out in the output of this band pass filter 246 amplify, to produce this intermediate-freuqncy signal IF.
Fig. 3 is the area oscillation device 300 of one of embodiment of the invention.For the PHS system, has only source oscillation signal, i.e. a 19.2MHz usually.The framework of area oscillation device 300 has been needed three kinds of different frequency oscillator signals among Fig. 2 embodiment are provided and design.One derived reference signal 304 provides a reference signal f
Ref, and phase-locked loop 302 couples this derived reference signal 304, according to this reference signal f
RefProduce oscillator signal f
OscRemove two circuit 310 through one, and one group of amplifier 320, the first sinusoidal signal sin ω just can be produced
1The t and the first cosine signal cos ω
1T is as the source oscillation signal of frequency reducing unit 202 among Fig. 2.In order to make the first in-phase signal I of 150KHz
1With the first orthogonal signalling Q
1Raising frequency is the second in-phase signal I of 1.2MHz
2With the second orthogonal signalling Q
2, the necessary second sinusoidal signal sin ω that produces 1.05MHz
2The t and the second cosine signal cos ω
2T.One first frequency divider 306 couples this derived reference signal 304, in order to according to this reference signal f
Ref,, produce this second sinusoidal signal sin ω in the mode that numeral is tabled look-up
2The t and the second cosine signal cos ω
2T.Comprise a numeral in this first frequency divider 306 and table look-up 316, receive this reference signal f
Ref, producing frequency is the digital signal of 1.05MHz.First frequency divider 306 comprises two-digit/analog converter 326 in addition, distinctly produces this second sinusoidal signal sin ω according to this digital signal
2The t and the second cosine signal cos ω
2T.In order to make the second in-phase signal I
2With the second orthogonal signalling Q
2Raising frequency is the intermediate-freuqncy signal IF of 10.8MHz, must produce the 3rd sinusoidal signal sin ω of 9.6MHz
3T and the 3rd cosine signal cos ω
3T.One second frequency divider 308 couples this derived reference signal 304, in order to frequency to be this reference signal f of 19.2MHz
RefFrequency division is 1/2nd to obtain the 3rd required sinusoidal signal sin ω
3T and the 3rd cosine signal cos ω
3T.Wherein this second frequency divider 308 comprises a duty cycle correction unit 318, earlier with this reference signal f
RefWork period (Duty Cycle) be adjusted into one to one, it is good to make the sideband of final output signal suppress (sideband rejection) effect, in order to frequency division.Following one should adjusted reference signal f except that two circuit 328
RefFrequency division is 1/2nd, produces the 3rd sinusoidal signal sin ω
3T and the 3rd cosine signal cos ω
3T.The framework of area oscillation device 300 can be saved VCO circuit on the single-chip, does not need unnecessary PLL circuit to come frequency locking, has also exempted the interference problem between a plurality of PLL.
Fig. 4 is the radio-frequency system of one of embodiment of the invention.By the described area oscillation device 300 of Fig. 3, the receiver of the described direct raising frequency reflector of Fig. 1 a and Fig. 2 can be integrated into a radio-frequency system.Receiving terminal comprises frequency reducing unit 202, and 204, the first raising frequency unit 206, harmonic filtration unit and the second raising frequency unit 208 change into intermediate-freuqncy signal IF with radiofrequency signal RF.Transmitting terminal comprises this radiofrequency launcher 100, with digital signal TX
IAnd TX
QChange into radiofrequency signal RF.And this area oscillation device 300 provides the oscillator signal of correspondence to 202, the first raising frequency unit, frequency reducing unit, 206, the second raising frequency unit 208 and these radiofrequency launchers 100.This framework is very simplified, and takes into account the advantage of Low Medium Frequency framework, can provide intermediate-freuqncy signal IF again, only needs one group of area oscillation device 300, the demand of having saved the VCO circuit simultaneously.
Fig. 5 is the flow chart of radio frequency receiving method of the present invention.In step 502, receive a radiofrequency signal RF, and, produce one first in-phase signal I frequency down to a first frequency of this radiofrequency signal RF
1With one first orthogonal signalling Q
1Wherein the frequency of this radiofrequency signal RF is 1.9GHz, this first in-phase signal I
1With the first orthogonal signalling Q
1Frequency be 150KHz.In step 504, with this first in-phase signal I
1With these first orthogonal signalling Q
1Carry out amplitude limit and amplify, produce one second in-phase signal I
2With one second orthogonal signalling Q
2In step 506, with this second in-phase signal I
2With these second orthogonal signalling Q
2Frequency raising frequency to a 1.2MHz, produce one the 3rd in-phase signal I
3With the 3rd orthogonal signalling Q
3In step 508, with the 3rd in-phase signal I
3With the 3rd orthogonal signalling Q
3Frequency raising frequency to a 9.6MHz, produce an intermediate-freuqncy signal IF.
The embodiment that more than provides has highlighted many characteristics of the present invention.Though the present invention discloses as above with preferred embodiment, so it is not in order to limiting scope of the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention, and when doing various changes and retouching.The branch section header carried according to regulation of this specification is not used in and limits that to carry in its content described scope, the especially background technology may not be the existing invention that has disclosed in addition, and invention description is also non-in order to limit technical characterictic of the present invention.Be with novelty of the present invention, progressive and protection range when look accompanying claim the person of being defined be as the criterion.
Claims (16)
1. a radio frequency receiver comprises:
One frequency reducing unit in order to receiving a radiofrequency signal, and with frequency down to a first frequency of this radiofrequency signal, produces one first in-phase signal and one first orthogonal signalling;
One harmonic filtration unit couples this frequency reducing unit, in order to receiving this first in-phase signal and these first orthogonal signalling, and this first in-phase signal and these first orthogonal signalling is carried out amplitude limit amplify, and produces one second in-phase signal and one second orthogonal signalling;
One first raising frequency unit, couple this harmonic filtration unit, in order to receiving this second in-phase signal and these second orthogonal signalling, and, produce one the 3rd in-phase signal and the 3rd orthogonal signalling with frequency raising frequency to a second frequency of this second in-phase signal and these second orthogonal signalling; And
One second raising frequency unit couples this first raising frequency unit, in order to receiving the 3rd in-phase signal and the 3rd orthogonal signalling, and with frequency raising frequency to the 3rd frequency of the 3rd in-phase signal and the 3rd orthogonal signalling, produces an intermediate-freuqncy signal.
2. radio frequency receiver as claimed in claim 1, wherein, this frequency reducing unit receives one first sinusoidal signal and one first cosine signal, this radiofrequency signal is carried out mixing and produced a mixing results, and this mixing results carried out power amplification and the filtering of image frequency composition, and obtain this first in-phase signal and these first orthogonal signalling.
3. radio frequency receiver as claimed in claim 1, wherein, this harmonic filtration unit comprises:
One limiting amplifier is in order to carry out the amplitude limit amplification to this first in-phase signal and these first orthogonal signalling; And
One first multiphase filter in order to this first in-phase signal after amplitude limit is amplified and the harmonic wave composition filtering in these first orthogonal signalling, produces this second in-phase signal and these second orthogonal signalling.
4. radio frequency receiver as claimed in claim 1, wherein, this first raising frequency unit comprises:
One first frequency mixer receives this second in-phase signal and one second cosine signal, and with this second in-phase signal and this second cosine signal mixing;
One second frequency mixer receives this second in-phase signal and one second sinusoidal signal, and with this second in-phase signal and this second sinusoidal signal mixing;
One three-mixer receives these second orthogonal signalling and this second sinusoidal signal, and with these second orthogonal signalling and this second sinusoidal signal mixing;
One the 4th frequency mixer receives these second orthogonal signalling and this second cosine signal, and with these second orthogonal signalling and this second cosine signal mixing;
One first adder deducts the mixing results of this first frequency mixer the mixing results of this three-mixer;
One second adder is with the mixing results of mixing results addition the 4th frequency mixer of this second frequency mixer; And
One second multiphase filter carries out multiphase filtering to the addition result of subtracting each other result and this second adder of this first adder, produces the 3rd in-phase signal and the 3rd orthogonal signalling.
5. radio frequency receiver as claimed in claim 1, wherein, this second raising frequency unit comprises:
One the 5th frequency mixer receives the 3rd in-phase signal and one the 3rd cosine signal, and with the 3rd in-phase signal and the 3rd cosine signal mixing;
One the 6th frequency mixer receives the 3rd in-phase signal and one the 3rd sinusoidal signal, and with the 3rd in-phase signal and the 3rd sinusoidal signal mixing;
One the 3rd adder is with the mixing results addition of the 5th frequency mixer and the 6th frequency mixer;
One band pass filter carries out bandpass filtering to the addition result of the 3rd adder, and staying the 3rd frequency is main composition; And
One second limiting amplifier carries out amplitude limit to the output of this band pass filter and amplifies, and produces this intermediate-freuqncy signal.
6. radio frequency receiver as claimed in claim 1 further comprises an area oscillation device, and this area oscillation device comprises:
One derived reference signal is in order to provide a reference signal;
One phase-locked loop couples this derived reference signal, in order to produce one first sinusoidal signal and one first cosine signal according to this reference signal, has a first frequency;
One first frequency divider couples this derived reference signal, in order to according to this reference signal, in the mode that numeral is tabled look-up, produces one second sinusoidal signal and one second cosine signal, has a second frequency;
One second frequency divider couples this derived reference signal, in order to produce one the 3rd sinusoidal signal and one the 3rd cosine signal according to this reference signal, has one the 3rd frequency; Wherein
The frequency of this reference signal is 19.2MHz, and this first frequency is 1.75GHz, and this second frequency is 1.05MHz, and the 3rd frequency is 9.6MHz.
7. radio frequency receiver as claimed in claim 6, wherein, this first frequency divider comprises:
One numeral is tabled look-up, and receives this reference signal, and producing frequency is a digital signal of second frequency; And
Two-digit/analog converter distinctly is converted to this second sinusoidal signal and this second cosine signal with this digital signal.
8. radio frequency receiver as claimed in claim 6, wherein, this second frequency divider comprises:
One duty cycle correction unit receives this reference signal, and work period of this reference signal is adjusted into one to one; And
One removes two circuit, should adjusted reference signal frequency division be 1/2nd, produces the 3rd sinusoidal signal and the 3rd cosine signal.
9. a radio frequency receiving method comprises:
Receive a radiofrequency signal, and, produce one first in-phase signal and one first orthogonal signalling frequency down to a first frequency of this radiofrequency signal;
This first in-phase signal and these first orthogonal signalling are carried out the amplitude limit amplification, produce one second in-phase signal and one second orthogonal signalling;
Frequency raising frequency to a second frequency with this second in-phase signal and these second orthogonal signalling produces one the 3rd in-phase signal and the 3rd orthogonal signalling; And
Frequency raising frequency to the 3rd frequency with the 3rd in-phase signal and the 3rd orthogonal signalling produces an intermediate-freuqncy signal.
10. radio frequency receiving method as claimed in claim 9, wherein, this step that is downconverted to first frequency comprises:
Receive one first sinusoidal signal and one first cosine signal, in order to this radiofrequency signal is carried out mixing and produced a mixing results; And
This mixing results is carried out power amplification and the filtering of image frequency composition, and obtain this first in-phase signal and these first orthogonal signalling.
11. radio frequency receiving method as claimed in claim 9, wherein, the step of this first in-phase signal and these first orthogonal signalling being carried out the amplitude limit amplification comprises the harmonic wave composition filtering in this first in-phase signal and these first orthogonal signalling.
12. radio frequency receiving method as claimed in claim 9 wherein, comprises this second in-phase signal and the step of this second orthogonal signalling raising frequency to this second frequency:
With this second in-phase signal and one second cosine signal mixing, obtain one first mixing results;
With this second in-phase signal and one second sinusoidal signal mixing, obtain one second mixing results;
With these second orthogonal signalling and this second sinusoidal signal mixing, obtain one the 3rd mixing results;
With these second orthogonal signalling and this second cosine signal mixing, obtain one the 4th mixing results;
This first mixing results is deducted the 3rd mixing results, obtain one and subtract each other the result;
With this second mixing results addition the 4th mixing results, obtain an addition result; And
This is subtracted each other the result carry out multiphase filtering, produce the 3rd in-phase signal and the 3rd orthogonal signalling with this addition result.
13. radio frequency receiving method as claimed in claim 9 wherein, comprises the 3rd in-phase signal and the step of the 3rd orthogonal signalling raising frequency to the 3rd frequency:
With the 3rd in-phase signal and one the 3rd cosine signal mixing, obtain one first mixing results;
With the 3rd in-phase signal and one the 3rd sinusoidal signal mixing, obtain one second mixing results;
With this first mixing results and this second mixing results addition, obtain an addition result;
This addition result is carried out bandpass filtering, and staying the 3rd frequency is main composition; And
Result to this bandpass filtering carries out the amplitude limit amplification, produces this intermediate-freuqncy signal.
14. radio frequency receiving method as claimed in claim 9 further comprises:
One reference signal is provided;
Produce one first sinusoidal signal and one first cosine signal according to this reference signal;
According to this reference signal,, produce one second sinusoidal signal and one second cosine signal in the mode that numeral is tabled look-up;
Produce one the 3rd sinusoidal signal and one the 3rd cosine signal according to this reference signal; Wherein
The frequency of this reference signal is 19.2MHz, and this first frequency is 1.75GHz, and this second frequency is 1.05MHz, and the 3rd frequency is 9.6MHz.
15. radio frequency receiving method as claimed in claim 14, wherein, the step that produces this second sinusoidal signal and this second cosine signal comprises:
According to this reference signal, producing frequency is a digital signal of second frequency; And
With this digital signal, be converted to analog signal, obtain this second sinusoidal signal and second cosine signal.
16. radio frequency receiving method as claimed in claim 14, wherein, the step that produces the 3rd sinusoidal signal and the 3rd cosine signal comprises:
The work period of this reference signal is adjusted into one to one; And
Should adjusted reference signal frequency division be 1/2nd, produce the 3rd sinusoidal signal and the 3rd cosine signal.
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| CN102315885B (en) * | 2010-06-29 | 2014-05-07 | 原相科技股份有限公司 | Signal strength sensing device, relevant method thereof and communication system |
| CN102724679A (en) * | 2011-03-30 | 2012-10-10 | 上海太极电子科技发展有限公司 | Anti-blind-zone design method for wireless signal transmission |
| CN104734640B (en) * | 2015-03-06 | 2018-10-30 | 上海海积信息科技股份有限公司 | A kind of frequency changer circuit and receiver board |
| CN108896980B (en) * | 2018-04-09 | 2022-06-21 | 飞依诺科技股份有限公司 | Method and device for generating RF data based on IQ data |
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|---|---|---|---|---|
| CN1173083A (en) * | 1996-08-06 | 1998-02-11 | 明碁电脑股份有限公司 | Improved double change type wireless transmit-receive system |
| WO2002067413A2 (en) * | 2001-02-16 | 2002-08-29 | Analog Devices, Inc. | Transmitter and receiver circuit for radio frequency |
| CN1619970A (en) * | 2003-11-19 | 2005-05-25 | 华为技术有限公司 | Receirer and transmitter matched with said receiver |
| JP2005136830A (en) * | 2003-10-31 | 2005-05-26 | Sharp Corp | Frequency converting circuit, radio frequency receiver, and radio frequency transceiver |
-
2005
- 2005-07-06 CN CNB2005100819131A patent/CN100411312C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1173083A (en) * | 1996-08-06 | 1998-02-11 | 明碁电脑股份有限公司 | Improved double change type wireless transmit-receive system |
| WO2002067413A2 (en) * | 2001-02-16 | 2002-08-29 | Analog Devices, Inc. | Transmitter and receiver circuit for radio frequency |
| JP2005136830A (en) * | 2003-10-31 | 2005-05-26 | Sharp Corp | Frequency converting circuit, radio frequency receiver, and radio frequency transceiver |
| CN1619970A (en) * | 2003-11-19 | 2005-05-25 | 华为技术有限公司 | Receirer and transmitter matched with said receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1893285A (en) | 2007-01-10 |
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