CN101273537A - Circuit and method for selectable high/low side injection in an intermediate frequency transceiver - Google Patents
Circuit and method for selectable high/low side injection in an intermediate frequency transceiver Download PDFInfo
- Publication number
- CN101273537A CN101273537A CNA2006800242451A CN200680024245A CN101273537A CN 101273537 A CN101273537 A CN 101273537A CN A2006800242451 A CNA2006800242451 A CN A2006800242451A CN 200680024245 A CN200680024245 A CN 200680024245A CN 101273537 A CN101273537 A CN 101273537A
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- circuit
- transceiver
- receiver circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Superheterodyne Receivers (AREA)
Abstract
A method of communication between a first transceiver having a first local oscillator set at a first frequency and a second transceiver having a second local oscillator set at a second frequency disclosed. The method includes transmitting a first signal at a first frequency from the first transceiver to the second transceiver, transmitting a second signal at the second frequency from the second transceiver to the first transceiver, and receiving the second signal at the first transceiver. The method further includes maintaining the first local oscillator at the first frequency and the second local oscillator at the second frequency during the transmitting of the first signal, during the receiving of the first signal, during the transmitting of the second signal, and during the receiving of the second signal.
Description
The cross reference of related application
The application advocates the U.S. Provisional Application No.60/696 that on June 30th, 2005 submitted, 229 priority.U.S. Provisional Application No.60/696,229 full content is incorporated into this by reference.
Technical field
Relate generally to electronic circuit of the present invention more specifically, relates to the circuit that is used for radio communication.
Background technology
In radio receiver, () system for example, 2.4GHz Industrial Scientific Medical (ISM) frequency band, selectivity is the important techniques requirement for adopting a plurality of channels.Selectivity is (not expect, when other signals Fu) exist, receive expectation channel frequency (expectation, ability Fd) having the channel frequency do not expected.This is similar to a certain dialogue that a personal reception is taken place in the room of houseful dialogue.
By using band pass filter (BPF) to realize the method for a kind of inhibition Fu (and only " listening to " Fd), BPF only allow Fd by it to be used for the further processing of radio circuit.Design may be very difficult and/or expensive at the BPF of input RF frequency (being 2.4GHz in the case).
For example, the 1MHz if channel frequency is separated by, then the BPF bandwidth must be approximately 1Mhz to suppress other channels.For radio frequency (RF) BPF (2.4GHz/1MHz) this will to need Q be 2400, yet for the BPF of the intermediate frequency with 10MHz (10MHz/1MHz) (IF), Q only is 10.Design Q is that 2400 BPF may be a difficulty and expensive, therefore needs to create IF and carries out filtering at IF.
In the transceiver of many low IF, transmitter is operated in and the identical frequency of local oscillator (LO), yet receiver is not like this.When contrasting with transmitter LO, receiver LO must move the frequency increment that equates with the IF frequency.Suppose only to exist a local oscillator, then this needs the phase-locked loop (PLL) of frequency synthesizer to lock again.
Conventional art in the radio design uses frequency mixer to carry out frequency inverted (promptly, two frequencies (F1, F2) be multiply by mutually obtain and frequently and difference frequency (Fout)=M*F1+/-N*F2 (wherein M or N=1,2,3 ...)=F1+F2, F1-F2,2*F1+/-F2,2*F2+/-F1,3*F1+/-2*F2, or the like).
A kind of simple scenario is that wherein the user wishes input rf signal (F for example
RF=2.402GHz) be converted to IF (for example 1MHz).By with F
RFWith local oscillator frequencies (LO) F
LOAbove-mentioned conversion is finished in=2.401GHz mixing.It should be noted that F
RFAt F
LO" on " 1MHz.Now observe F
RF=2.400GHz (LO " under " 1MHz) difference frequency that also produces 1MHz (is actually-1MHz, is described to when frequency spectrum is anti-phase+1MHz).Therefore, for F
LOFor 2.401GHz and IF are the situation of 1Mhz, 2.400GHz is F
RF" mirror image (image) " (F of=2.402GHz
Image).
The wireless device that employing is used for the frequency mixer of frequency inverted is subjected to the interference of its image frequency easily.Conventional art such as using the image cancellation frequency mixer can be avoided this interference.For IF is 2MHz and F
LOBe the situation of 2.401GHz (not changing), F
RF=2.403GHz and F
Image=2.339GHz.It shall yet further be noted that according to which RF signal and have the frequency of wishing reception, F
RFAnd F
ImageThe role interchangeable.Alternately, a wireless device can use the zero-IF receivers that does not have mirror image.
Shown in Figure 1 this locks the example of the conventional requirement of PLL again, and wherein Fig. 1 is the block diagram of the method that communicates between two transceivers that are illustrated in according to conventional art.
With reference to figure 1, in the left side of dotted line the operation of first transceiver is shown, and the operation of second transceiver is shown on the right side of dotted line.First and second transceivers all only comprise single LO.The transmitter of first and second transceivers is always launched on the frequency of their corresponding LO.
At first, first transceiver is launched (upper left corner of Fig. 1 is to the upper right corner) at 2402MHz to second transceiver.The receiver of second transceiver is set at 2402MHz and receives, yet in order to carry out mixing operation received signal is down-converted to 1MHz IF, the LO of second transceiver is set to 2403MHz.
The expection of first transceiver receives following affirmation from second transceiver, and promptly the signal from the emission of first transceiver is received.Because first transceiver is expected at 2403MHz from the second transceiver received signal, so first and second transceivers all must change their LO frequencies separately at first transceiver after the emission of second transceiver.
That is to say that second transceiver must change to 2402MHz to launch to first transceiver from 2403MHz with the frequency of its LO.Similarly, in order to carry out mixing operation being down-converted to 1MHz IF from the signal that second transceiver receives, first transceiver must change to 2403MHz from 2402MHz with the frequency of its LO.
According to aforesaid conventional art, when sending data burst (data burst), the two LO frequency of first transceiver and second transceiver must take place at least once to change at every turn.Yet changing the LO frequency may need a large amount of time, because PLL can not be set to new frequency immediately.Usually, PLL needs some times just can be stabilized on the new LO frequency.When each change of LO frequency, lock PLL again and mean some stand-by period (latency) in the data delivery.Again lock PLL and also mean required extra time, must be powered longer time quantum for each data set first and second transceiver, this negatively has influence on current drain and battery life.
Another traditional solution is to have two independently LO, and a LO is used for receiving, and a LO is used for emission.Yet this traditional solution needs more power consumption and chip area, and these are not expected yet.In addition, exist because of the difficult design due to the reciprocation possible between two oscillators (" passing (pulling) ").
Expectation has PLL locking time and lower current drain faster.The more lower powered PLL of expectation in battery powered application, and, also expect locking time faster when when lacking burst form emission/reception data (wherein long low-power free time and/or PLL are the major part that is used to send/receive the time of packet locking time).
Embodiments of the invention are devoted to solve these and other shortcoming of correlation technique.
Description of drawings
Fig. 1 is the block diagram that is illustrated in according to the method for communicating between two transceivers of conventional art.
Fig. 2 is the diagrammatic sketch that illustrates according to the method for selecting high/low end injection of some embodiment of the present invention.
Fig. 3 further illustrates the improved flow chart of describing among Fig. 2 of selecting the method for high/low end injection.
Fig. 4 is the block diagram that illustrates according to the receiver circuit of some embodiment of the present invention.
Fig. 5 is the block diagram that illustrates according to the receiver circuit of some embodiment of the present invention.
Fig. 6 is the circuit diagram that the inverter selected that is applicable to embodiments of the invention is shown.
Embodiment
In following paragraph, some embodiment according to the present invention is described in and has realized quick conversion (fast turn around), the improved Method and circuits of selecting high/low end to inject in the low IF transceiver.Embodiments of the invention improve on the basis of conventional art by utilizing the image frequency of receiver.
According to embodiments of the invention, heterodyne receiver uses such intermediate frequency (IF), detects (demodulation) signal at this IF.In many novel integrated receivers, IF and is known as " low IF " usually from 1MHz to 3MHz sometimes because the IF frequency substantially with the channel spacing of system on the same order of magnitude.Because " low IF " is a relative term, so it should be interpreted as be applied to arbitrary specific frequency range.
As example, low IF receiver has the LO that is tuned to (in one exemplary embodiment) 2403MHz with the 1MHz IF in the 2.4GHz band device.This local oscillator is injected into frequency mixer, and this frequency mixer is exported as it with frequency and difference frequency based on LO and RF input generation.
In above-mentioned hypothetical examples, be downmixed to 1MHzIF (2403MHz-2402MHz) and detected at the input rf signal of 2.402GHz.Yet, also can be downmixed at the input rf signal of 2.404GHz-1MHz IF (2403MHz-2404MHz) and detected.This provide according to which input rf signal have expectation channel frequency Fd go up different situations to two kinds.
The situation of high-end injection is the situation of LO frequency greater than expectation RF frequency.In the case, expectation RF channel frequency Fd is 2402MHz, and the LO frequency is 2403MHz, and desired frequency Fu (or image frequency) is not 2404MHz, because if the RF input be 2404MHz then the output of frequency mixer be-1MHz (2403MHz-2404MHz).High-end injection refers to the situation of LO frequency greater than expectation RF frequency.
The situation that low side injects is the situation of LO frequency less than expectation RF frequency.In the case, expectation RF channel frequency Fd is 2404MHz, and the LO frequency is 2403MHz, and desired frequency Fu (or image frequency) is not 2402MHz.Low side injects the situation of LO frequency less than expectation RF frequency that refer to.
Fig. 2 is the diagrammatic sketch that illustrates according to the method for selecting high/low end injection of some embodiment of the present invention.Fig. 3 is the improved flow chart of selecting the method for high/low end injection that further illustrates according to some embodiment of the present invention.
With reference to figure 2, the operation of main transceiver is shown in the dotted line left side, and the operation from transceiver is shown on the dotted line right side.Advocate peace and all only comprise single LO from transceiver.Advocate peace and always launch in the frequency of their corresponding LO from the transmitter of transceiver.
In master unit, LO is set to 2402MHz, so should be set in this frequency reception from the unit.LO is set to 2403MHz from the unit, and input rf signal is down-converted to 1MHz IF then.Be arranged to the high-end mirror image of inhibition from the receiver of unit, and only receive low-side signal.With the initial RF Frequency spectrum ratio, the received spectrum of slave unit at 1MHz IF by anti-phase.Data are by anti-phase under the situation of FSK modulation, thereby make by using inverter deal with data easily.
From the unit, LO is set to 2403MHz, and master unit should be set in this frequency reception.Indicated as mentioned, the LO of master unit is set to 2402MHz, and master unit also is down-converted to 1MHz with received signal.Yet the receiver of master unit is arranged to the inhibition low-side image, because it only expects to receive high-side signal.
Therefore, as shown in Figure 2, master unit is arranged to carries out the low side injection, and is arranged to the high-end injection of execution from the unit.This and traditional solution shown in Figure 1 have formed contrast, and first and second transceivers all are arranged to and carry out high-end injection in traditional solution.Similarly, first and second transceivers are all disposed be used to carry out that low side injects also is traditional.
In order to use the method to connect, the slave unit of advocating peace is preferably consulted determining that in them which will keep its default injection state (keeping identical LO frequency), and another changes its injection way (switching to another LO frequency).In other words, one of the slave unit of will advocating peace is set and is used for the low side injection, and another setting in the slave unit of will advocating peace is used for high-end injection.
For purposes of the present invention, it is such equipment that term is advocated peace from only indicating main equipment, and it is consulted to determine that in them which will be kept default injection state and another changes its injection way and LO frequency advocating peace between the slave unit to carry out.In some cases, any change in the slave unit that do not need to advocate peace of the possibility of result of negotiation because they may be configured by rights, is promptly advocated peace and is carried out high-end injection from one of unit, and another is carried out low side and injects.
In alternate embodiment of the present invention, can omit negotiations process fully.For example, made an equipment carry out high-end injection and another equipment when carrying out low side and injecting by pre-configured, this situation can occur when send two equipment that must use in pairs and this two equipment from manufactory.The example of two such equipment for example can be Wireless Keyboard and USB adapter (dongle).
In a preferred embodiment of the invention, because any unit can be a master unit or from the unit, so each equipment can both switch between the high-end and low side pattern of injecting.According to described embodiments of the invention, improved solution make advocate peace in the slave unit LO frequency in each equipment all can the two maintains same frequency for receiving mode and emission mode.
Fig. 3 further illustrates the improved flow chart of describing among Fig. 2 of selecting the method for high/low end injection.The flow chart of Fig. 3 illustrates some exemplary process in this method, and also all processing in this method needn't be shown.In addition, the exemplary process of all shown in Fig. 3 might not be that to put into practice embodiments of the invention necessary.That is to say that inventive aspect can be present in few to an exemplary processing shown in Figure 3.
With reference to figure 3,,, consult at main transceiver with between the transceiver handling 310 according to some embodiment of the present invention.Handle 310 through consultation and be used for determining advocating peace and which of transceiver will keep its default injection state (keeping identical LO frequency), and from transceiver another of advocating peace changes its injection way (switching to another LO frequency) from.
As shown in Figure 3, be optional the handling through consultation between transceiver of advocating peace.For example, according to other embodiment, two transceivers that need to use in pairs may be made a transceiver carry out high-end injection and another transceiver execution low side injection by pre-configured.The example of two such transceivers for example can be Wireless Keyboard and USB adapter.Then do not need in such a case to consult.
Handling 320, based on the result who handles 310 through consultation, advocating peace is changed from the injection way of one of transceiver.This change causes being configured so that advocate peace from transceiver advocating peace and is arranged to high-end injection from one of transceiver, is arranged to low side from another of transceiver and injects and advocate peace.
As shown in Figure 3, it also is optional handling 320.For example, can be such situation: handle 310 result and determine to advocate peace and be configured to make to advocate peace from transceiver and be arranged to high-end injection and advocate peace and be arranged to low side from another of transceiver and inject from one of transceiver.Just needn't change main under these circumstances or from the configuration of one of transceiver.
Handling 330, autonomous transceiver takes place to the emission from transceiver.When emission, the LO of main transceiver has frequency F
LO (M)=X HZ, and have frequency F from the LO of transceiver
LO (S)=YHZ.The signal of autonomous transceiver emission is also at X HZ.If Y＞X then carries out high-end injection from transceiver.Yet, if Y＜X carries out low side from transceiver and injects.For the concrete example that provides among Fig. 2, because F
LO (M)=2402MHz and F
LO (S)=2403MHz is so carry out high-end injection by slave unit.
Handling 340, since the emission of transceiver to main transceiver takes place.Handling 330 and handle between 340, the LO of main transceiver maintains frequency F
LO (M)=X HZ, and maintain frequency F from the LO of transceiver
LO (S)=Y HZ.Since the signal of transceiver emission also at Y Hz.If X＞Y, then main transceiver is carried out high-end injection.Yet if X＜Y, main transceiver is carried out low side and is injected.For the concrete example that provides among Fig. 2, because F
LO (M)=2402MHz and F
LO (S)=2403MHz injects so carry out low side by main equipment.
Fig. 4 is the block diagram that illustrates according to the receiver circuit 400 of some embodiment of the present invention.
With reference to figure 4, receiver circuit 400 comprises the input from antenna 410 and low noise amplifier 420, and low noise amplifier has output and is coupled to the input of the input of antenna.
Fig. 5 is the block diagram that illustrates according to the circuit 500 of some embodiment of the present invention.
With reference to figure 5, receiver circuit 500 comprises the input from antenna 510 and low noise amplifier 520, and low noise amplifier has output and is coupled to the input of the input of antenna.
Though in Fig. 4 and embodiments of the invention shown in Figure 5, comprise low noise amplifier 420,520, yet low noise amplifier does not need to exist in alternate embodiment.For example, need not to use low noise amplifier, then antenna output can be directly connected to the input that mirror image suppresses structure if can realize total system demand (for example gain, noise figure etc.).
The two is quick (agile) for the receiver circuit 400,500 of Fig. 4 and Fig. 5, at this for purposes of the present invention, term " quick " refer to the configurable receiver circuit of user to suppress the situation of low-side image or high-end mirror image.
The user can finish such configuration, because in Fig. 4 and circuit shown in Figure 5, can be at arbitrary signal of arbitrary port of frequency mixer or phase shifter by anti-phase simply, and the opposite end will be suppressed then.That is to say, by changing in frequency mixer or the phase shifter polarity of one of signal on any, can cause circuit 400,500 to suppress the RF signal on the LO and another RF signal is passed through, perhaps alternately, cause the RF signal under the circuit inhibition LO and another RF signal is passed through.In other words, configurable receiver circuit 400,500 injects to carry out high-end injection or low side.
Inverter of being controlled by external signal EXT selected 490 and 570 existence provide the agility of receiver circuit 400,500.According to the state of control signal EXT, can select inverter 490,570 to generate and the identical output of non-outside input that can select inverter, or with the non-outside identical output of importing of inverted version that can select inverter.
The position that illustrates of the inverter selected 490,570 in circuit 400,500 is exemplary.Because easier at lower frequency usually with signal inversion, so according to a preferred embodiment of the invention, after signal is down-converted to IF, in output place of any frequency mixer with signal inversion.In such situation shown in Fig. 4 and Fig. 5.
Alternately, in circuit 400, can select inverter 490 can be placed between circuit node A and the summer 480 or circuit node B and summer 480 between signal path in any position.Similarly, in circuit 500, can select inverter 570 can be placed between circuit node A and the CBPF 580 or circuit node B and CBPF 580 between signal path in any position.
Fig. 6 is the circuit diagram that the inverter selected 600 that is applicable to embodiments of the invention is shown.Particularly, the inverter selected 490 of Fig. 4 and Fig. 5 and 570 can have as selecting the structure shown in the inverter 600.
The two positions change over switch 620 that can select inverter 600 to comprise inverter 610 and control by external control signal EXT.According to the state of external control signal EXT, can select inverter 600 to be created on the signal that input IN place occurs, perhaps the inverted version of the signal that occurs at input IN place at output OUT place.
The structure of the inverter selected of Fig. 6 600 is very simple, those skilled in the art must make many other equivalent electric circuit or structures, yet these circuit or structure are carried out following equivalent function: the inverted version that input signal or input signal optionally are provided in output place that can select inverter.
In alternate embodiment of the present invention, can realize circuit 400 and 500 by using differential signal, comprise the complementary signal of actual signal and actual signal at this differential pair.Usb signal for example is a differential signal.In the case, can select the function of inverter 490 and 570 to be in response to the state of external control signal EXT, optionally switch actual signal and corresponding complementary signal.Can easily finish these operations by use differential switch or other equivalent electric circuits, yet not need these details are carried out supplemental instruction for understanding this invention.
In aforesaid embodiments of the invention, the element that illustrates of circuit 400,500 makes circuit have the ability of the signal that automatic inhibition do not expect, promptly circuit can be carried out mirror image and suppresses.
Yet in replacement circuit according to other embodiments of the invention, circuit may not comprise the execution mirror image and suppress needed element.For example, though unlikely, can expect to exist some embodiment that image frequency (noiseless) wherein do not occur.In the case, not needing to carry out mirror image suppresses.Yet, be still at least in the method that between two transceivers, communicates according to an embodiment of the invention useful because as explanation hereinbefore, it has eliminated and has changed the corresponding stand-by period of demand of LO frequency.
In alternate embodiment of the present invention, improved solution can be used with arbitrary heterodyne system, wherein distinguishes the principal and subordinate by final IF.That is to say, in receiver, can have a plurality of conversions.In addition, improved solution can arbitrary IF frequency work.As using in the present invention, term " low IF " is a relative term, should not be interpreted as being applied to arbitrary specific frequency range.
According to embodiments of the invention, one of important advantage is these embodiment when receiving mode switches to emission mode, has eliminated the needs of locking frequency synthesizer phase-locked loop (PLL) again.This has improved the stand-by period in the data delivery, and has improved battery life because equipment needn't for send/receive packet and keep connecting for a long time.
In addition, according to embodiments of the invention, switching to the low side injection way from high-end injection way is very simple thing.As mentioned above, arbitrary signal of image removing circuit inside configuration can be by anti-phase simply.
Another significant advantage is that in the transceiver that uses Low Medium Frequency (IF), embodiments of the invention allow the quick conversion from the emission mode to the receiving mode.According to embodiments of the invention, LO or frequency synthesizer maintain same frequency for transmitting and receiving, thereby make each pattern can not take place PLL locking time when changing.
Embodiments of the invention are applicable to various other processing of carrying out the processing of describing except that the present invention well, or the variant of the processing of the present invention's description, and carry out to be different from the order of describing in the present invention.According to some embodiment of the present invention, can carry out the processing of describing among the present invention by processor or other electric devices and electronic component, for example can carry out the computer-readable instruction that comprises code (code packages is contained in the medium that computer can use) and the element of computer executable instructions.
For clarity sake, from the present invention, omit many details of embodiment, and many details of the method for design and the manufacturing circuit that the present invention advocated, these details are extensively known and uncorrelated with the present invention.
Should be understood that the reference " embodiment " or " embodiment " that run through this specification mean that special characteristic, structure or the characteristic described in conjunction with the embodiments are at least one embodiment of the present invention involved.Therefore, in this two or more references " embodiment " or " embodiment " or " alternate embodiment " of emphasizing and should be understood that many places appearance in this specification, be not all must be with reference to identical embodiment.In addition, specific feature, structure or characteristic suitably can be combined among one or more embodiment of the present invention.
Similarly, should understand in the aforementioned description to exemplary embodiment of the present invention, in order to oversimplify the present invention who helps to understand one or more different inventive aspects, a plurality of features of the present invention are combined in its single embodiment, diagrammatic sketch or the description sometimes.Yet method of the present invention should not be interpreted as reflecting such intention, i.e. the invention of being advocated need be than the more feature of clearly putting down in writing in each claim of feature.
More properly, claims reflected as following, and inventive aspect is present in all features feature still less than single aforementioned disclosed embodiment.Therefore, incorporate the claim after the embodiment into this embodiment clearly at this, each claim is as indivedual embodiment of the present invention and independence.
Claims (20)
1. receiver circuit comprises:
Local oscillator (LO) is used for generating first signal at first circuit node of described receiver circuit, and described first signal has the LO frequency;
First frequency mixer, be used to receive secondary signal from the second circuit node origin of described receiver circuit, be used to receive the 3rd signal from described first circuit node origin, and be used to generate the output of first frequency mixer, described secondary signal has the radio frequency (RF) of expectation;
Second frequency mixer is used to receive described secondary signal, is used to receive the 4th signal from described first circuit node origin, and is used to generate the output of second frequency mixer;
Converter circuit is used to receive the 5th signal from described first frequency mixer output origin, is used to receive the 6th signal from described second frequency mixer output origin, and is used to generate intermediate frequency (IF) signal; And
Be placed in the inverter selected of a certain position of the described receiver circuit of from following group, selecting, form by following position for described group: be coupling in the primary importance between described first circuit node and described first frequency mixer, be coupling in the second place between described first circuit node and described second frequency mixer, be coupling in the 3rd position between described second circuit node and described first frequency mixer, be coupling in the 4th position between described second circuit node and described second frequency mixer, be coupling in the 5th position between described first frequency mixer output and the described converter circuit, and be coupling in the 6th position between described second frequency mixer output and the described converter circuit.
2. receiver circuit as claimed in claim 1, the described a certain position of selecting inverter to be placed in the described receiver circuit of from the group of forming by described the 5th position and described the 6th position, selecting.
3. receiver circuit as claimed in claim 1, wherein said receiver circuit is quick.
4. receiver circuit as claimed in claim 3, the described inverter of selecting is used in response to external control signal, and the inverted version that the described input of selecting inverter or described input optionally are provided is as output.
5. receiver circuit as claimed in claim 4, the described inverter of selecting is used in response to described external control signal, and described receiver circuit is placed high-end injection way or low side injection way.
6. circuit as claimed in claim 5, wherein said receiver circuit are arranged to the image frequency that suppresses described expected frequency.
7. receiver circuit as claimed in claim 4 is selected described converter circuit from the group of being made of summer and complex bandpass filters.
8. receiver circuit comprises:
First signal path between first input of the output of local oscillator and first frequency mixer, described LO is used to generate the signal with LO frequency;
Secondary signal path between first input of the output of described LO and second frequency mixer;
The 3rd signal path between second input of first circuit node and described first frequency mixer, described first circuit node is used for dividing the input signal with expectation radio frequency (RF) signal;
The 4th signal path between second input of described first circuit node and described second frequency mixer;
At the output of described first frequency mixer and the 5th signal path between the converter circuit;
At the output of described second frequency mixer and the 6th signal path between the described converter circuit, described converter circuit is used for generating intermediate frequency (IF) output based on the input that arrives by described the 5th signal path and described the 6th signal path; And
Can select inverter, be arranged to described receiver circuit agility is provided, the described selection in the signal path that inverter is placed in and selects from following group is made up of described the first, second, third, fourth, the 5th and the 6th signal path for described group.
9. receiver circuit as claimed in claim 8, the described inverter of selecting is arranged to signal inversion by sending along the signal path selected from following group, between high-end injection way and low side injection way, switch described receiver circuit, form by described the first, second, third, fourth, the 5th and the 6th signal path for described group.
10. receiver circuit as claimed in claim 9, the described selection in the signal path that inverter is placed in and selects from the group of being made up of described the 5th signal path and described the 6th signal path.
11. receiver circuit as claimed in claim 9, described receiver circuit are arranged to the image frequency that suppresses described expectation RF signal.
12. receiver circuit as claimed in claim 9, the described inverter of selecting is arranged in response to external control signal, makes the signal inversion that sends along described signal path.
13. receiver circuit as claimed in claim 8 is selected described converter circuit from the group of being made of summer and complex bandpass filters.
14. one kind at first transceiver with first local oscillator that is set in first frequency with have the method that communicates between second transceiver of second local oscillator that is set in second frequency, described method comprises:
Launch first signal from described first transceiver to described second transceiver, described first signal has described first frequency;
To described first transceiver emission secondary signal, described secondary signal has described second frequency from described second transceiver;
Receive described secondary signal at described first transceiver; And
During the emission of described first signal, reception period at described first signal, during the emission of described secondary signal, and at the reception period of described secondary signal, described first local oscillator is maintained described first frequency, and described second local oscillator is maintained described second frequency.
15. method as claimed in claim 14, also comprise, before described first signal of emission, between described first transceiver and described second transceiver, hold consultation to determine that in described first and second transceivers which will maintain in the configuration of carrying out first injection way, and in described first and second transceivers which will change to the configuration of carrying out second injection way, and described second injection way is opposite with described first injection way.
16. method as claimed in claim 15, one of wherein said first and second injection way are high-end injection way, another pattern in wherein said first and second injection way is the low side injection way, and wherein said secondary signal is used as the confirmation of receipt emission of described first signal.
17. method as claimed in claim 15 also comprises one of described first and second transceivers are changed to the described configuration of carrying out described second injection way.
18. method as claimed in claim 17 wherein changes to one of described first and second transceivers the described configuration of carrying out described second injection way and comprises that to make the internal signal of one of described first and second transceivers anti-phase.
19. method as claimed in claim 15 comprises that also described first transceiver of configuration is to suppress the mirror image of described second frequency.
20. method as claimed in claim 19 comprises that also described second transceiver of configuration is to suppress the mirror image of described first frequency.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US69622905P | 2005-06-30 | 2005-06-30 | |
| US60/696,229 | 2005-06-30 | ||
| US11/427,712 | 2006-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101273537A true CN101273537A (en) | 2008-09-24 |
Family
ID=40006445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800242451A Pending CN101273537A (en) | 2005-06-30 | 2006-06-30 | Circuit and method for selectable high/low side injection in an intermediate frequency transceiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101273537A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103329004A (en) * | 2011-01-21 | 2013-09-25 | 飞思卡尔半导体公司 | Phased-array receiver, radar system and vehicle |
| CN104247275A (en) * | 2012-04-25 | 2014-12-24 | 高通股份有限公司 | Combining multiple desired signals into a single baseband signal |
-
2006
- 2006-06-30 CN CNA2006800242451A patent/CN101273537A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103329004A (en) * | 2011-01-21 | 2013-09-25 | 飞思卡尔半导体公司 | Phased-array receiver, radar system and vehicle |
| US9411039B2 (en) | 2011-01-21 | 2016-08-09 | Freescale Semiconductor, Inc. | Phased-array receiver, radar system and vehicle |
| CN104247275A (en) * | 2012-04-25 | 2014-12-24 | 高通股份有限公司 | Combining multiple desired signals into a single baseband signal |
| US9673842B2 (en) | 2012-04-25 | 2017-06-06 | Qualcomm Incorporated | Combining multiple desired signals into a single baseband signal |
| CN104247275B (en) * | 2012-04-25 | 2017-11-24 | 高通股份有限公司 | Multiple desired signals are combined into the transceiver and method of single baseband signal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5825813A (en) | Transceiver signal processor for digital cordless communication apparatus | |
| FI117841B (en) | An arrangement for transmitting and receiving a radio frequency signal in two frequency bands | |
| JPH1032520A (en) | Transmitter-receiver sending/receiving radio frequency signal for two frequency bands | |
| JP2009260978A (en) | Method and apparatus for downconverting transmitted signals using plurality of modulation formats to common intermediate frequency range | |
| KR20080104306A (en) | Rf-to-baseband receiver architecture | |
| WO2008050940A2 (en) | Wireless transceiver system for supporting dual mode | |
| JP5345858B2 (en) | Device for receiving and / or transmitting radio frequency signals with noise reduction | |
| CN101371461B (en) | Receiving device, and electronic equipment using the device | |
| CN103427852B (en) | Radio-frequency front-end | |
| US7805113B2 (en) | Circuit and method for selectable high/low side injection in an intermediate frequency transceiver | |
| WO2007125793A1 (en) | Receiving apparatus and electronic device using same | |
| CN101273537A (en) | Circuit and method for selectable high/low side injection in an intermediate frequency transceiver | |
| KR20100129542A (en) | Multi frequency band receiver | |
| CN111835379A (en) | Radio frequency transceiver and radio frequency transceiving system | |
| JPH11289273A (en) | Radio transceiver | |
| JP5172752B2 (en) | RF tag reader circuit | |
| WO2023097508A1 (en) | Phase-locked loop, radio frequency transceiver, and communication device | |
| KR20100066717A (en) | Muti-mode local oscillator aand method for oscillating | |
| JP2005514850A (en) | Transceiver with multi-state direct digital synthesizer driven by phase locked loop | |
| KR100728922B1 (en) | ?×? type ???? transceiver | |
| JP2006186718A (en) | Radio receiving device, radio transmitting and receiving device, and mobile terminal device | |
| KR100557176B1 (en) | Remote of cordless phone compatible with walkie-talkie | |
| CN219372427U (en) | Transceiver and communication device | |
| CN114598351B (en) | Transceiver circuit and system | |
| WO2001071934A1 (en) | Communication system with frequency modulation and with a single local oscillator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080924 |