CN1985436A - Pulling-free LO generation system and method - Google Patents
Pulling-free LO generation system and method Download PDFInfo
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- CN1985436A CN1985436A CNA2005800136392A CN200580013639A CN1985436A CN 1985436 A CN1985436 A CN 1985436A CN A2005800136392 A CNA2005800136392 A CN A2005800136392A CN 200580013639 A CN200580013639 A CN 200580013639A CN 1985436 A CN1985436 A CN 1985436A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B27/00—Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
- H03B2200/006—Functional aspects of oscillators
- H03B2200/007—Generation of oscillations based on harmonic frequencies, e.g. overtone oscillators
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Transceivers (AREA)
Abstract
A system and method for generating an LO signal for an RF transmitter is provided that eliminates the risk of LO-pulling. A filtering technique is employed to select the desired harmonic of a VCO signal, usually the third. The required in-phase and quadrature LO signals can be derived by means of dividers. Any harmonic relation is avoided between the transmit signal and the VCO frequency, without generation of intermediate signals close to the VCO frequency, thus circumventing pulling of the VCO.
Description
The present invention relates to the LO traction of local oscillator or single die radio-frequency (RF) transceiver.More particularly, the present invention relates at least a mode is the system and method that transceiver produces the LO signal.The most specifically, the present invention relates to produce the system and method for LO signal, wherein can not draw the VCO of the transmitter in the transceiver at least a mode.
Current radio transceiver has comprised its most of functions in single chip.So just allow high scale integrated, thereby make that using radio frequency (RF) transceiver in consumer products is that very cost is effective.But when whole RF functions were placed in the singulated dies, " LO traction " and " VCO traction " needed the problem of solution with regard to becoming chip designers.
The LO traction when getting back to the voltage controlled oscillator (VCO) of frequency synthesizer, takes place in the part coupling that sends signal.Utilization comes modulated transmit signal with the information that is sent out, thereby VCO is also modulated.Send signal (for example passing through frequency mixer) because this VCO is used to produce, therefore existence makes and sends the serious feedback control loop that reduces of quality of signals.Because the regenerative nature of VCO is even if minimum coupling all may produce serious influence to sending quality of signals.
For sending several possibilities proposition in the literature that frequency mixer produces the LO signal.The scheme of all propositions all is intended to reduce the traction of VCO, for example referring to Zolfaghari, and Alireza and Razavi, " A Low-Power 2.4 GHz Transmitter/Receiver CMOS IC " (IEEE-JSSC of Behzad, the 38th volume, the 2nd phase, in February, 2003, the 176-183 page or leaf) and Darabi, people's such as Hooman " A 2.4-GHzCMOS Transceiver for Bluetooth " (IEEE-JSSC, the 36th volume, the 12nd phase, December calendar year 2001, the 2016-2023 page or leaf).The scheme that these proposed adopts the two-stage up conversion that sends signal or adopts the two-stage of LO signal to produce the harmonic relationships of avoiding sending between signal (or its harmonic wave) and the VCO frequency.Yet, under any situation, all have a large amount of harmonic waves, subharmonic and mixed product, and in the middle of these mixed products certain some still can cause the VCO traction.In the scheme that some proposed, need a large amount of filtering to suppress unnecessary spectrum component.
People such as Zolfaghari propose to use dual IF (IF) in described up-conversion process.Described frequency approach is selected to does not have spectrum component to overlap with VCO, thereby is that cost has been avoided described traction problems with the signal path of complexity.Another kind method is that the LO of traditional direct up-conversion transmitter of combination and replacement produces.Equally, its frequency scheme is selected such that and does not produce the coincidence frequency spectrum.But the solution that people such as Darabi propose need be carried out filtering to mixer output signal before signal is exaggerated.If do not have filter application before further amplifying, then mixer output signal will be 800MHz square wave rather than required 2400MHz signal.This is to be caused by the harmonic relationships between two frequency mixer input signals.Therefore, this method requires more accurate filtering.The method that people such as Darabi propose is shown in Figure 1, and it comprises the local oscillator with required 2400MHz frequency 100 that is used to produce output signal LOI 107 and LOQ 108.Local oscillator 100 comprises VCO circuit 101, buffer 109, frequency divider 102 and two frequency mixers 105,106, this frequency divider 102 is used to produce 800MHz homophase LO component I 103 and quadrature component Q 104 signals, and the frequency of described signal is half of output of this VCO.VCO circuit 101 produces the 1600MHz signal, this signal is provided to divider circuit 102 by buffer 109 subsequently, and this divider circuit 102 produces in-phase signal I 103 and the orthogonal signalling Q 104 with 800MHz frequency (half of the output frequency of VCO 101 in other words).
Therefore, need be at the solution of LO traction problems of the prior art.The invention provides a kind of system and method that under the risk situation of not drawing VCO, produces the LO signal for transmitter.System and method of the present invention adopts filtering technique to select the required harmonic wave of VCO signal.Required homophase and quadrature LO signal can obtain by divider.System and method of the present invention has been avoided in any harmonic relationships that sends between signal and the VCO frequency, and need not to produce the M signal near the VCO frequency.Therefore, system and method for the present invention has been avoided the traction of VCO.
VCO produces sinusoidal input signal, and this signal is converted into square wave subsequently, is performed division and filtered, so that obtain to have the required harmonic wave homophase I and the quadrature Q signal of predetermined output frequency.
According to an aspect of the present invention, local oscillator is provided to produce signal under required output frequency.This local oscillator comprises: oscillating circuit, and it is configured to be lower than generation first in-phase signal and first orthogonal signalling under the first frequency of required output frequency, and first orthogonal signalling have the phase shift with respect to first in-phase signal; A pair of harmonic filter, one of them is coupled and receives first in-phase signal, and another is coupled and receives first orthogonal signalling, and this is configured to obtain each predetermined harmonic wave in the middle of these first signals to harmonic filter; First and second send frequency mixers, and it is coupled into respectively by each the described harmonic wave that obtains in the middle of described first signal and drives.
In one embodiment, obtain the required harmonic wave of square-wave input signal, and therefrom produce in-phase signal and orthogonal signalling, thus make these orthogonal signalling with respect to this in-phase signal by phase shift, described I and Q signal are used to drive and send frequency mixer.
In one embodiment, described oscillating circuit is configured to use and has high quality factor (Q) and than the LC accumulator of small size.
Required harmonic wave is triple-frequency harmonics preferably.Alternative embodiment adopts a filter to select required harmonic wave.
Fig. 1 shows the art methods that is used to avoid the LO traction;
Fig. 2 shows first preferred embodiment that produces according to pulling-free LO of the present invention;
Fig. 3 shows second preferred embodiment that produces according to pulling-free LO of the present invention;
Fig. 4 shows the 3rd preferred embodiment that produces according to pulling-free LO of the present invention;
Fig. 5 shows and will it be used the architecture of the wireless communication system of embodiments of the invention; And
Fig. 6 shows the simplified block diagram of wireless device of the communication system of Fig. 5 according to an embodiment of the invention.
It will be understood by those of skill in the art that following description is intended to explanation rather than limits the present invention.Those skilled in the art it is also understood that in the scope of purport of the present invention and appended claims can multiple modification.In current description, can omit the unnecessary details of known function and operation, in order to avoid fuzzy the present invention.
In first embodiment, produce pulling-free LO as shown in Figure 2.Operating in VCO201 under the 1600MHz provides input 212 to produce circuit 200 to IQ, this input by divider 202 divided by 2 so that produce homophase LO component I 203 and quadrature LO component Q 204, it comprises the odd harmonic of 800MHz.As shown in Figure 2, the output signal of divider 202 (preferably divided by 2) is a square wave 203,204, and it comprises these odd harmonics.In this first preferred embodiment, system and method for the present invention is applied to square wave 203,204 so that obtain the triple-frequency harmonics of these signals with filter 211, and therefore obtains in-phase signal LOI 207 and the orthogonal signalling LOQ 208 of 2400MHz.LOI 207 and LOQ 208 are used to subsequently drive and send and receiving mixer.
In this first embodiment, suppose that the Q factor of LC accumulator is 10, and the 800MHz fundametal compoment has been suppressed 28dB.Since the signal level of triple-frequency harmonics than the low 9.5dB of 800MHz fundametal compoment (fourier coefficient of square wave: 1,1/3,1/5,1/7...), so the LO signal of the 2400MHz of gained comprises-the 800MHz spurious signal of 20dBc.In first embodiment, this superfluous signal is removed by antenna filter after mixing.
In order to realize that in transmit path good mirror image suppresses, the amplitude that described I and Q signal must have accurate quadrature and equate.First embodiment comprises the filter amplifier that at least one realizes this coupling.Preferably, heterogeneous (LC) filter satisfies described coupling demand.
In a second embodiment, produce pulling-free LO as shown in Figure 3, thereby avoided the coupling demand of the strictness among first embodiment.The VCO 201 that operates under the 1600MHz provides input 312 to produce circuit 300 to IQ, thereby in a second embodiment, carries out triple-frequency harmonics filtering 211 prior to described divider (preferably divided by 2 202).Orthogonality relation between described I and the Q signal determines that by divider 202 it has guaranteed accurate quadrature now.(amplification) version through slicing to described VCO signal is directly carried out triple-frequency harmonics filtering 211, thereby described in a second embodiment LC accumulator is tuned to 4800MHz.This higher frequency allows higher accumulator Q factor, and as an additional advantage, it has littler area.In addition, in this second embodiment, only need a LC accumulator, thereby further saved area.
Because divided by 2 202 regeneration speciality, described input sinusoidal signal is converted into square wave, therefore to filtered harmonic signal or optional to the extra amplification of required I and Q LO signal.Only before described filtering, need to amplify (or slicing), so that produce 1600MHz signal with enough harmonic signal compositions.The output spectrum of this harmonic filter still comprises residual 1600MHz component, but this signal has been suppressed 6dB extraly by divider 202.Therefore, superfluous signal component under the 1600MHz that described LO frequency spectrum is comprised is compared less than 26dBc with the LO under the 2400MHz, wherein still suppose Q=10 (because " symmetrization " effect of divider 202, also exist-26dBc spectrum component) at the 3200MHz place.In a second embodiment, described redundant frequency spectrum is by antenna filter or be positioned at one of them filtration of the filter (all not shown) that sends chain.
In the 3rd embodiment, as shown in Figure 4, the regeneration attribute divided by 2413 is used to produce the triple frequency harmonic filter 211 of 1600MHz square wave to be input to second embodiment.In the 3rd embodiment, pulling-free LO is produced by the VCO 201 that is tuned to 3200MHz, it allows the higher Q and the more small size of LC accumulator, and this 3200MHz signal is imported into IQ and produces circuit 400, wherein this 3200MHz signal at first is performed division, and the 1600MHz square wave of gained is imported into the circuit substantially the same with second embodiment.The output spectrum of I 407 and Q 408 signals is suitable with Q 308 signals with the I 307 of second embodiment, and it comprises the residual spectral components of comparing low at least 26dB with required 2400MHz signal at 1600MHz and 3200MHz place.The frequency spectrum of described 1600MHz and 3200MHz is further suppressed by the antenna filter (not shown).
In optional embodiment, before the divider 202 in the middle of first to the 3rd embodiment each is being used further filtering, so that suppress the 1600MHz fundamental signal.This further filtering can be finished by following any mode: between divider output and filter input,, add the second level even third level filtering with the AC coupling of the corner frequency of for example 4GHz, and the notch filter of using 1600MHz.Because the signal division produces the sideband of symmetry, therefore carry out filtering divided by 2 prior to last.The advantage of the 3rd embodiment is, only just there be (signal and VCO signal itself 100% that should be noted that this 3200MHz is relevant, so " DC traction " (being phase shift) only may take place) last in the signal component of traction VCO after divided by 2.
The equipment and the method for nothing traction local oscillator of the present invention can be used for wireless personal local area network (WPAN) and wireless lan (wlan), and wherein the RF transmitter comprises frequency mixer, and this frequency mixer is configured to utilize the output signal of this LO of data signal modulation.Network of the present invention be can use and GSM, bluetooth and DECT equipment further comprised.Fig. 5 shows the representative wireless network that can use various embodiments of the present invention.According to principle of the present invention, a frequency mixer is provided, this frequency mixer is configured to utilize data-signal to modulate the output signal of LO, thereby avoids the traction of LO.Should be noted that for illustrative purposes the network shown in Fig. 5 is very little.In practice, most of WLAN will comprise quantity much more be associated with ambulatory transceiver device of the present invention.
The low-power circuit of LO generator of the present invention and architecture can be applied to WPAN and WLAN, and allow to reduce the cost and the power consumption of wireless device wherein.For this reason, the present invention proposes a kind of filtering technique, this filtering technique is used for selecting the desired harmonic wave of VCO signal, and it has required homophase and the quadrature LO signal that obtains by divider.Therefore avoided sending any harmonic relationships between signal and the described VCO, and avoided producing M signal near the VCO frequency.
With reference now to Fig. 6,, each equipment among the WPAN/WLAN shown in Figure 5 can comprise the transceiver with the architecture shown in the block diagram of Fig. 6.Each equipment can comprise controller 602, foundation LO generator 603 of the present invention (200 300 400) and the receiver 604 that is coupled at least one transmitter 601.Transmitter 601 and receiver 604 are coupled to antenna 605.All said elements can be integrated on the single chip with other assemblies (for example antenna).Controller 602 can provide self-adaptive program, thereby for example make this transceiver be adapted to different modulation schemes and specific to the data rate of various communication protocols, described communication protocol comprises IEEE 802.11, bluetooth and any other agreement well known in the prior art.This controller can be programmed to described LO generator, so that select specific harmonic wave, it is not limited to triple-frequency harmonics.
Though illustrated and described the preferred embodiments of the present invention, but those skilled in the art are to be understood that, local oscillator as herein described is illustrative, under the situation that does not deviate from true scope of the present invention, can carry out multiple change and modification to described local oscillator, and can replace wherein element with equivalence element.In addition, under the situation that does not deviate from center range of the present invention, can much revise, for example, can under different output frequencies, operate described VCO so that make instruction of the present invention be adapted to particular case.Therefore, the present invention is not limited to the disclosed specific embodiment as implementing optimal mode of the present invention, but comprises all embodiment in the scope that falls into appended claims.
Claims (36)
1, a kind of pierce circuit, it is used to produce the homophase and the quadrature component of the transmission signal with required frequency, and described circuit comprises:
Oscillator, it is used to export first sinusoidal signal with first frequency; And
The IQ that comprises final divider produces circuit, described IQ produces in-phase signal component and the quadrature phase signal component that circuit is used for receiving first sinusoidal signal and therefrom derives this transmission signal, each described component has required frequency, thereby between the required frequency of this transmission signal and first frequency, there is not harmonic relationships
Wherein, avoided the traction of this oscillator.
2, pierce circuit as claimed in claim 1, wherein, described IQ produces circuit and comprises:
Be used for first sinusoidal signal is transformed into the device of first square-wave signal;
Frequency divider as described final divider, it is used for receiving first square wave and first square wave is carried out division, so that produce the first in-phase signal component and the first quadrature phase signal component of this first square wave, wherein by phase shift, and described first component comprises through carrying out the odd harmonic of first sinusoidal signal behind the division each described first component with respect to another; And
First and second filters, its from this frequency divider receive respectively, amplification and the filtering first in-phase signal component and the first quadrature phase signal component so that the predetermined harmonic wave that obtains this first in-phase signal component and the first quadrature phase signal component respectively is with respectively as the in-phase signal component and the quadrature phase signal component of this transmission signal.
3, pierce circuit as claimed in claim 2, wherein, the described device that is used to change comprises amplifier.
4, pierce circuit as claimed in claim 3, wherein, described frequency divider is the divider divided by 2, and described predetermined harmonic wave is a triple-frequency harmonics.
5, pierce circuit as claimed in claim 4, wherein, the amplitude that the described in-phase signal component of described transmission signal and quadrature phase signal component have accurate quadrature and equate.
6, pierce circuit as claimed in claim 5, wherein, each in the middle of described first and second filters comprises LC accumulator and heterogeneous (LC) filter.
7, pierce circuit as claimed in claim 6, wherein, described first frequency is 1600MHz, described required frequency is 2400MHz, and the Q factor of described LC accumulator equals 10.
8, pierce circuit as claimed in claim 7, wherein, described IQ produces circuit and comprises that further the first-harmonic filter is to suppress the fundamental signal of 1600MHz, described first-harmonic filter is suitable for being coupled to described IQ and produces circuit before described final divider, so that receive the input signal of this final divider, and alternatively offering this final divider through the signal that suppresses as input signal.
9, pierce circuit as claimed in claim 8, wherein, described first-harmonic filter is to select from the group that is made of 1600MHz notch filter, the 3rd filter and third and fourth filter.
10, pierce circuit as claimed in claim 1, wherein, described IQ produces circuit and comprises:
Be used for first sinusoidal signal is transformed into the device of first square wave;
Filter, it is used for this first square wave of reception, amplification and filtering, so that the predetermined harmonic wave that obtains this first square wave is with as second sinusoidal signal with second frequency.
Frequency divider, it receives this second sinusoidal signal and it is carried out division as described final divider, and therefrom produces the described in-phase signal component and the quadrature phase signal component of described transmission signal respectively.
11, pierce circuit as claimed in claim 10, wherein, the described device that is used to change comprises amplifier.
12, pierce circuit as claimed in claim 11, wherein, described frequency divider is the divider divided by 2, and described predetermined harmonic wave is a triple-frequency harmonics.
13, pierce circuit as claimed in claim 12, wherein:
First frequency is 1600MHz;
Second frequency is 4800MHz;
Required frequency is 2400MHz; And
First filter further comprises the LC accumulator that its Q factor equals 10, and described LC accumulator is tuned to 4800MHz.
14, pierce circuit as claimed in claim 13, wherein, described IQ produces circuit and comprises that further the first-harmonic filter is to suppress the fundamental signal of 1600MHz, described first-harmonic filter is suitable for being coupled to described IQ and produces circuit before described final divider, so that receive the input signal of this final divider, and alternatively offering this final divider through the signal that suppresses as input signal.
15, oscillating circuit as claimed in claim 14, wherein, described first-harmonic filter is to select from the group that is made of 1600MHz notch filter, second filter and the second and the 3rd filter.
16, pierce circuit as claimed in claim 1, wherein, described IQ produces circuit and comprises:
First frequency divider, it is used for receiving first square wave, it is carried out division and this first square wave is transformed into first sinusoidal signal;
Filter, it is used for this first square wave of reception, amplification and filtering, so that the predetermined harmonic wave that obtains this first square wave is with as second sinusoidal signal with second frequency; And
Second frequency divider, it receives this second sinusoidal signal and it is carried out division as described final divider, so that therefrom produce the described in-phase signal component and the quadrature phase component of described transmission signal respectively.
17, pierce circuit as claimed in claim 16, wherein, described first and second frequency dividers are the divider divided by 2, and described predetermined harmonic wave is a triple-frequency harmonics.
18, pierce circuit as claimed in claim 17, wherein:
First frequency is 3200MHz;
First square wave has the frequency of 1600MHz;
Second frequency is 4800MHz;
Required frequency is 2400MHz; And
Described filter comprises that further its Q factor is greater than 10 LC accumulator.
19, pierce circuit as claimed in claim 18, wherein, described IQ produces circuit and comprises that further the first-harmonic filter is to suppress the fundamental signal of 1600MHz, described first-harmonic filter is suitable for being coupled to described IQ and produces circuit before described final divider, so that receive the input signal of this final divider, and alternatively offering this final divider through the 1600MHz component that suppresses as input signal.
20, oscillating circuit as claimed in claim 19, wherein, described first-harmonic filter is to select from the group that constitutes by 1600MHz notch filter, second filter, the second and the 3rd filter and with the AC coupling of the corner frequency of 4GHz, and described AC coupling also is suitable for being coupled to described IQ and produces circuit before first filter.
21, a kind of being used to produces the in-phase signal component I of transmission signal and the method for quadrature phase signal component Q, and wherein each component has identical required frequency, and this method may further comprise the steps:
Has first sinusoidal signal of first frequency by oscillator output; And
From first sinusoidal signal, derive in-phase signal component I and the quadrature phase signal component Q that this sends signal, each described component with respect to another by phase shift, each described component has required frequency, thereby between the required frequency of this transmission signal and first frequency, there is not harmonic relationships, thereby avoids the traction of this oscillator.
22, method as claimed in claim 21, wherein, described derivation step further may further comprise the steps:
First sinusoidal signal is transformed into first square wave;
With this first square wave divided by 2 so that obtain the first homophase square-wave component and the first quadrature phase square-wave component, thus make each described first component have with respect to another phase shift and comprise through the odd of carrying out this first frequency behind division ripple all;
Each described first component is amplified (slicing), so that obtain second in-phase signal and second quadrature phase signal; And
Second in-phase signal and second quadrature phase signal are carried out filtering, so that the predetermined harmonic wave that obtains this second in-phase signal and second quadrature phase signal is with respectively as described I and Q signal.
23, method as claimed in claim 22, wherein, described switch process comprises described first sinusoidal signal is amplified (slicing).
24, method as claimed in claim 23, wherein, described predetermined harmonic wave is a triple-frequency harmonics.
25, method as claimed in claim 24, wherein, the amplitude that described I and Q signal have accurate quadrature and equate.
26, method as claimed in claim 25, wherein, described required frequency is 2400MHz, described first frequency is 1600MHz.
27, method as claimed in claim 21, wherein, described derivation step further may further comprise the steps:
Described first sinusoidal signal is transformed into first square wave;
This first square wave is amplified (slicing) to first frequency;
Square wave after this amplification is carried out filtering, so that the predetermined harmonic wave that obtains the square wave after this amplification is with as second sine wave with second frequency; And
With this second sine wave divided by 2, so that obtain described I and Q with required frequency.
28, method as claimed in claim 27, wherein, described switch process comprises described first sinusoidal signal is amplified (slicing).
29, method as claimed in claim 28, wherein, described predetermined harmonic wave is a second harmonic.
30, method as claimed in claim 29, wherein, described first frequency is 1600MHz, and the 3rd frequency is 4800MHz, and required frequency is 2400MHz.
31, method as claimed in claim 30 further may further comprise the steps:
Before described division steps, carry out filter step, so that suppress to be included in 1600MHz fundamental signal wherein to described second sinusoidal signal.
32, method as claimed in claim 21, wherein, described derivation step further may further comprise the steps:
With first sinusoidal signal divided by 2, so that obtain first square wave;
This first square wave is carried out filtering and amplification, so that the predetermined harmonic wave that obtains this first square wave is with as second sinusoidal signal with second frequency; And
With this second sinusoidal signal divided by 2, so that obtain described I and Q with required frequency.
33, method as claimed in claim 32, wherein:
First frequency is 3200MHz;
First square wave has the frequency of 1600MHz;
Second frequency is 4800MHz; And
Required frequency is 2400MHz.
34, method as claimed in claim 33 further may further comprise the steps:
Before carrying out divided by 2 step, to one of them execution filter step of described second square wave and second sinusoidal signal, so that inhibition is included in 1600MHz fundamental signal wherein to described second sine wave.
35, a kind of transceiver comprises:
The local oscillation generator, it comprises the oscillator that is used to export first signal with first preset frequency and comprises that the IQ of divider produces circuit, this divider is used for receiving described sinusoidal signal and therefrom derives homophase square wave and the quadrature square-wave component that sends signal, and wherein each square-wave component has predetermined transmission frequency; And
Controller, its be used to programme first preset frequency of this oscillator and predetermined transmission frequency of this divider so that should be scheduled to not have harmonic relationships between the transmission frequency and first preset frequency, have wherein been avoided the traction of this oscillator.
36, transceiver as claimed in claim 35, wherein, described oscillator comprises voltage controlled oscillator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56679704P | 2004-04-30 | 2004-04-30 | |
| US60/566,797 | 2004-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1985436A true CN1985436A (en) | 2007-06-20 |
Family
ID=34965448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800136392A Pending CN1985436A (en) | 2004-04-30 | 2005-04-25 | Pulling-free LO generation system and method |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1745544A1 (en) |
| JP (1) | JP2007535855A (en) |
| KR (1) | KR20070004890A (en) |
| CN (1) | CN1985436A (en) |
| WO (1) | WO2005107059A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553425A (en) * | 2014-10-28 | 2016-05-04 | 联发科技股份有限公司 | Frequency tripler and local oscillator generator |
| CN105830339A (en) * | 2013-12-18 | 2016-08-03 | 瑞典爱立信有限公司 | Local oscillator signal generation |
| CN108270438A (en) * | 2017-01-03 | 2018-07-10 | 芯光飞株式会社 | Local oscillator generation system and its production method |
| CN108418591A (en) * | 2018-02-09 | 2018-08-17 | 南京中感微电子有限公司 | Radio frequency transmitter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE602006005469D1 (en) | 2005-02-14 | 2009-04-16 | Koninkl Philips Electronics Nv | RECEIVERS FOR THE SIMULTANEOUS RECEIPT OF VARIOUS STANDARDS |
| EP1867044A2 (en) * | 2005-03-08 | 2007-12-19 | Nxp B.V. | Electronic device for generating a local oscillator signal having a frequency equal to a fractional part of a fundamental frequency. |
| US8655296B2 (en) | 2007-12-18 | 2014-02-18 | Harris Corporation | Frequency synthesizer and related method for generating wideband signals |
| JP2014039143A (en) * | 2012-08-15 | 2014-02-27 | Nec Corp | Frequency converter and frequency conversion method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1001915A (en) * | 1964-03-26 | 1965-08-18 | Communications Patents Ltd | Improvements in or relating to variable frequency oscillation generators |
| JPH10505728A (en) * | 1995-06-30 | 1998-06-02 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | Tunable oscillator with harmonic output |
| JP2001230695A (en) * | 2000-02-16 | 2001-08-24 | Nec Corp | Radio equipment and frequency conversion method to be used therefor |
| FR2814606A1 (en) * | 2000-09-25 | 2002-03-29 | Koninkl Philips Electronics Nv | POLYPHASE FILTER SIGNAL SOURCE |
| JP3908591B2 (en) * | 2002-05-01 | 2007-04-25 | ソニー・エリクソン・モバイルコミュニケーションズ株式会社 | Modem and demodulator and portable radio |
-
2005
- 2005-04-25 JP JP2007510205A patent/JP2007535855A/en not_active Withdrawn
- 2005-04-25 WO PCT/IB2005/051341 patent/WO2005107059A1/en not_active Application Discontinuation
- 2005-04-25 CN CNA2005800136392A patent/CN1985436A/en active Pending
- 2005-04-25 KR KR1020067022130A patent/KR20070004890A/en not_active Application Discontinuation
- 2005-04-25 EP EP05718801A patent/EP1745544A1/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105830339A (en) * | 2013-12-18 | 2016-08-03 | 瑞典爱立信有限公司 | Local oscillator signal generation |
| CN105553425A (en) * | 2014-10-28 | 2016-05-04 | 联发科技股份有限公司 | Frequency tripler and local oscillator generator |
| CN108270438A (en) * | 2017-01-03 | 2018-07-10 | 芯光飞株式会社 | Local oscillator generation system and its production method |
| CN108270438B (en) * | 2017-01-03 | 2021-12-07 | 戴乐格半导体韩国株式会社 | Local oscillator generating system and generating method thereof |
| CN108418591A (en) * | 2018-02-09 | 2018-08-17 | 南京中感微电子有限公司 | Radio frequency transmitter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007535855A (en) | 2007-12-06 |
| KR20070004890A (en) | 2007-01-09 |
| EP1745544A1 (en) | 2007-01-24 |
| WO2005107059A1 (en) | 2005-11-10 |
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