CN101150328B - Transceiving system and compound filter - Google Patents
Transceiving system and compound filter Download PDFInfo
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- CN101150328B CN101150328B CN2007101535028A CN200710153502A CN101150328B CN 101150328 B CN101150328 B CN 101150328B CN 2007101535028 A CN2007101535028 A CN 2007101535028A CN 200710153502 A CN200710153502 A CN 200710153502A CN 101150328 B CN101150328 B CN 101150328B
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- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
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- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H2011/0494—Complex filters
Abstract
A transceiving system utilizing a shared filter module is provided. The shared filter module is selectively filtering signals in a first band in a first mode and a second band in a second mode. The first mode is a receiver mode whereas the second mode is a transmission mode. The shared filter module comprises a compound filter comprising two low pass filters and a coupling controller to manage input and output wiring of the low pass filters. When the coupling controller is enabled in the first mode, the compound filter acts as a bandpass filter. When the coupling controller is disabled, the compound filter acts as two independent low pass filters.
Description
Technical field
The invention relates to the shared formula filter (shared filter) that is applied in the receive-transmit system (transceiving system), in particular to a kind of filter framework that can flexibly switch on different filtering bandwidths.
Background technology
In communication system, Filter Design has been played the part of very important role.Desirable receiver channel filter can by promote signal to noise ratio (Signal to Noise Ratio SNR) reduces signal distortion, gets rid of outer disturb (the out-of-band interference) of band, and with the bandwidth constraints of noise in ideal range.It is satisfactory to both parties that yet the process that reduces signal distortion and the process of reducing noise interference are difficult to, so often must yield to reality during designing filter.
Fig. 1 is the receive-transmit system (transceiving system) 100 of prior art.When receiving mode, low noise amplifier (LNA) 102 receives and the interior feed signals RFIN of amplification radio frequency, then frequency mixer 104I and 104Q produce homophase and quadrature mixing results #Iin and #Qin respectively, and carry out low-pass filtering by low pass filter (LPF) 106I and 106Q.The filtering that is produced RXI and RXQ is as a result then delivered to analog to digital converter (ADC) (not shown) and is carried out follow-up processing.Relative, when transfer mode, send baseband signal TXI and TXQ outside and be input to low pass filter 110I and 110Q respectively, raising frequency is then carried out in the filtering that produces #IOUT and #QOUT as a result in up-converter mixer 112I and 112Q, and variable gain amplifier 114 to these raising frequencies result gain adjust after, carry out power amplification and become the wireless transmission of feed signals RFOUT confession radio frequency outside by power amplifier 116.
At low pass filter 106I, 106Q, among 110I and the 110Q, most important parameter is exactly a filter bandwidth.In general communication system, low pass filter 110I and 110Q need have than 106Q and the also wide bandwidth of 106Q, and still, the filter of different bandwidth parameter is made in the receive-transmit system can produce some redundancies.So causing no small expending on chip area and the cost, is a kind of adverse factors for the 3C Product that major part requires light and power saving.In view of this, in order to reduce the repetitive component in the receive-transmit system, the improvement of filter framework has urgent necessity.
Summary of the invention
The invention provides a kind of method of more effectively utilizing repetitive component, and reduce the cost of system.
The invention provides a kind of receive-transmit system, but feed signals is sent data in obtaining in the demodulation radio frequency, and will to send data-modulated outside be the outer feed signals of radio frequency.It comprises shares the formula filtration module, optionally works in first pattern and second pattern of the signal that is used for filtering first bandwidth and second bandwidth respectively.Demodulation module can be in first pattern with radio frequency in feed signals rectification and produce first demodulation result, and first demodulation result is sent to shares the formula filtration module and filter, produce first filter result of first bandwidth.First baseband module can send data in producing with the first filter result digitlization in first pattern.Second baseband module can will be sent digital simulationization outside in second pattern, produce and send baseband signal outside, and will send baseband signal outside and deliver to and share the formula filtration module and filter, and produce second filter result of second bandwidth.Radio-frequency module can be modulated second filter result in second pattern, produces the outer feed signals of radio frequency.
A kind of composite type filter that another execution mode discloses wherein comprises in-phase input end, orthogonal input, in-phase output end, and quadrature output.The input of homophase low pass filter is coupled to in-phase input end, and its output is coupled to in-phase output end.The input of quadrature low pass filter is coupled to orthogonal input, and its output is coupled to the quadrature output.The composite type filter comprises the coupling access status that the distribution controller can be used to switch inphase/orthogonal/I/O end in addition.In receiving mode, the distribution controller is couple to the quadrature output with in-phase input end, and in-phase output end is couple to orthogonal input, homophase low pass filter and quadrature low pass filter are coupled mutually and forms band pass filter.And in transfer mode, the distribution controller cuts out, thereby homophase low pass filter and quadrature low pass filter are isolated mutually, works alone separately.
In another execution mode of composite type filter, a plurality of filter units are connected and are formed hierarchic structure, and each filter unit comprises the homophase low pass filter, quadrature low pass filter, the first distribution controller and the second distribution controller.In the series connection of filter unit, first output of last homophase low pass filter connects the first input end of next homophase low pass filter, and second output of last quadrature low pass filter connects second input of next quadrature low pass filter.The first input end of the most previous homophase low pass filter is exactly an in-phase input end, and second input of the most previous quadrature low pass filter is exactly an orthogonal input.First output of last homophase low pass filter is exactly an in-phase output end, and second output of last quadrature low pass filter is exactly the quadrature output.During work, in receiving mode, the first and second distribution controllers all are activated, thereby make the composite type filter become band pass filter.And in transfer mode, the first and second distribution controllers all are closed, thereby homophase low pass filter and quadrature low pass filter are isolated mutually, work alone separately.
Further, the another execution mode of composite type filter also is to connect with a plurality of filter units to form hierarchic structure, and comprising first operational amplifier, each filter unit is serially connected on the homophase passage, and second operational amplifier be serially connected on the orthogonal channel, comprise pair of differential input and pair of differential output respectively.The first distribution controller is controlled the coupling access status of the negative output terminal of the negative input end of first operational amplifier and second operational amplifier, and the second distribution controller is controlled the coupling access status of the positive output end of the positive input terminal of first operational amplifier and second operational amplifier.The 3rd distribution controller is controlled the coupling access status of the negative input end of the positive output end of first operational amplifier and second operational amplifier.The 4th distribution controller is controlled the coupling access status of the positive input terminal of the negative output terminal of first operational amplifier and second operational amplifier.In receiving mode, the first, second, third and the 4th distribution controller all is activated, thereby makes the composite type filter become band pass filter.In transfer mode, the first, second, third and the 4th distribution controller all is closed, thereby makes the composite type filter become two independently low pass filters.
Receive-transmit system provided by the invention and composite type filter have reduced repetitive component, make production cost reduce.
Description of drawings
Fig. 1 is the structural representation of the receive-transmit system of prior art.
Fig. 2 is the structural representation of an execution mode of receive-transmit system of the present invention, comprises to share the formula filtration module simultaneously for transmitting and receive use.
Fig. 3 is a structural representation of sharing first execution mode of formula filtration module among Fig. 2.
Fig. 4 is a structural representation of sharing second execution mode of formula filtration module among Fig. 2.
Fig. 5 is the structural representation of another execution mode of composite type filter among Fig. 4.
Fig. 6 is the structural representation of the execution mode of filter unit among Fig. 5.
Embodiment
Following execution mode specific description realizes the present invention as how preferable mode.Execution mode is only for the general mode of using of explanation, but not is used for limit scope of the present invention.Actual range is as the criterion so that claim is listed.
Fig. 2 is the structural representation of an execution mode of receive-transmit system 200 of the present invention, and receive-transmit system 200 comprises shared formula filtration module 210 and comes for Data Receiving and the common use of transmission.The low pass filter 106I that is different from prior art among Fig. 1,106Q, 110I and 110Q, the shared formula filtration module 210 of present embodiment can use jointly for transmission and receiving mode.Comprised the low noise amplifier 102 identical in the demodulation module 202, frequency mixer 104I and 104Q with Fig. 1 function.When receiving mode, feed signals (inbound RF signal) RFIN in demodulation module 202 received RFs, and mixing results #Iin that produces and #Qin are sent to shared formula filtration module 210 respectively.Then share the 210 output filtering of formula filtration module as a result RXI and RXQ to baseband module 220 for further processing.More particularly, can comprise variable gain amplifier 222I and 222Q in the baseband module 220, to filtering RXI and the RXQ adjustment that gains respectively as a result.And analog to digital converter (ADC) 224I and 224Q are respectively coupled to variable gain amplifier 222I and 222Q, are used for producing accordingly numerical data DI and DQ.In transmitter portion, comprised digital to analog converter (DAC) 232I and 232Q in the baseband module 230, numerical data DI and DQ can be converted to and send baseband signal TXI and TXQ outside.When receive-transmit system 200 works in transfer mode, baseband module 230 will be sent baseband signal TXI and TXQ outside and be sent to and share formula filtration module 210, and #Iout and #Qout modulate to radio-frequency module 204 as a result to make its output filtering.Comprise up-converter mixer 112I identical and 112Q in the radio-frequency module 204 with Fig. 1, variable gain amplifier 114 and power amplifier 116 are finished raising frequency mixing and power amplification supervisor therein and are produced outer feed signals (the outbound RF signal) RFOUT of the radio frequency that can supply emission.The detailed execution mode of sharing formula filtration module 210 will disclose in following explanation.
Fig. 3 is a structural representation of sharing the execution mode of formula filtration module 210.In shared formula filtration module 210, use four selector 310I, 310Q, 320I and 320Q decide the data transfer path under the different mode, and low pass filter 302I and 302Q can use jointly for transfer mode and receiving mode.So-called directly conversion (direct conversion) reflector is called zero intermediate frequency (Zero Intermediate Frequency again, ZIF) reflector, if be applied in time division multiple access (TDMA) communication system such as wireless network (IEEE 802.11) or Bluetooth communication, its transmission and to launch employed bandwidth parameter be different.For instance, receiving terminal is needed to be the filter of 9MHz, and the transmitting terminal needs is the filter of 11MHz.Can't take place simultaneously because transmit and receive,, low pass filter 302I and 302Q are suitable for simultaneously under two kinds of patterns so available alignment unit 330 is adjusted the bandwidth of low pass filter 302I and 302Q.The method of adjusting is the time constant that changes the RC circuit among low pass filter 302I and the 302Q.There is a kind of way of prior art to provide one group of so-called capacitor group (capacitor bank) circuit, utilizes simple short circuit and open circuit mechanism to make the bandwidth of filter increase or reduce.Above-mentioned bandwidth adjustment is to reach the purpose that the bandwidth that makes filter changes by each specific in capacitor group electric capacity is switched, and concrete execution mode can be that " SHARED REICEIVER AND TRANSMITTER FILTER ", publication number are the U.S. Patent application of 2007/0040605 A1 with reference to denomination of invention.
When shared formula filtration module 210 works in receiving mode, selector 310I, 320I, switch among 310Q and the 320Q switches to node M 1 to set up path, make mixing results #Iin and #Qin be sent to low pass filter 302I and 302Q from demodulation module 202, the filtering of low pass filter 302I and 302Q RXI and RXQ as a result then is sent to baseband module 220 as the interior baseband signal of sending.On the contrary, when shared formula filtration module 210 is operated in transfer mode, selector 310I, 320I, switch among 310Q and the 320Q switches to the other end, foundation is via the path of node M 2, make that baseband module 230 produces send baseband signal TXI outside and TXQ enters low pass filter 302I respectively and 302Q carries out outputing to radio-frequency module 204 (Fig. 2) after the filtering.As described above, alignment unit 330 bandwidth parameter of adjusting low pass filter 302I and 302Q simultaneously meets the demand of each pattern.So filter is shared the formula framework can provide lot of advantages, comprises the quantity and the cost that reduce assembly.And ensuing execution mode more proposes further improvement.
Fig. 4 is the structural representation of the execution mode of a foundation shared formula filtration module 400 of the present invention, has wherein further improved shared formula filtration module 210, and low pass filter 302I and 302Q are replaced by composite type filter 410.Composite type filter 410 comprises low pass filter 402I and 402Q and distribution controller 404. Low pass filter 402I and 402Q are identical with low pass filter 302I and 302Q basically, but distribution controller 404 further provides a kind of elasticity that changes with pattern to couple function.End is gone in the output of low pass filter 402I and 402Q and output (node finI, foutI, finQ and foutQ) all joins with distribution controller 404.When shared formula filtration module 400 was operated in transfer mode, distribution controller 404 cut out.So low pass filter 402I and 402Q do not join mutually, work alone, and function is as low pass filter 302I and 302Q.Relative, when shared formula filtration module 400 was operated in receiving mode, distribution controller 404 was opened, and made node finI connected node foutQ, and node finQ connected node foutI, formed a kind of framework of cross-coupled.In fact the composite type filter 410 under this state promptly is equivalent to band pass filter.This shows that the framework that present embodiment proposed has satisfied the demand of Low Medium Frequency receiver and zero intermediate frequency reflector effectively simultaneously with cheap cost.In addition, composite type filter 410 still can satisfy various possible bandwidth demands by the time constant adjustment among 330 couples of low pass filter 402I of aforesaid alignment unit and the 402Q.The cross-coupled function of alignment unit 330 collocation distribution controllers 404 also can apply in Low Medium Frequency reflector and the zero intermediate frequency receiver conversely.So the advantage of this framework not just reduces cost, the mode of bandwidth combination also can be very flexible, and it is described not limit present embodiment.
Fig. 5 is the structural representation of another execution mode of composite type filter 410 among Fig. 4, employing be a species stage framework (1adder structure), comprise a plurality of filter units 510 and be cascaded.Comprise low pass filter 402I and 402Q in each filter unit 510, and distribution controller 404.The input and output node of low pass filter 402I is respectively P1 and P2, and the input and output node of low pass filter 402Q is respectively P3 and P4.The first distribution controller 502 and the second distribution controller 504 have been comprised on distribution controller 404 is concrete, wherein the first distribution controller 502 is responsible for the conducting state between switching node P1 and the P4, and the conducting state that the second distribution controller 504 is responsible between switching node P2 and the P3.When receive-transmit system 200 works in receiving mode, the first distribution controller 502 and the second distribution controller 504 are opened simultaneously, with its corresponding node conducting of being responsible for, thereby make filter unit 510 change band pass filter into, and whole receive-transmit system 200 structurally just become a Low Medium Frequency receiver.Relative, when receive-transmit system 200 was operated in transfer mode, the first distribution controller 502 and the second distribution controller 504 all were closed.At this moment, can find to be unified into to low pass filter 402I structures all the node foutI low pass filter on one three rank by node FinI.Similarly, also constitute another independently third-order low-pass filter by node finQ to low pass filter 402Q all the foutQ.Thus, receive-transmit system 200 just becomes a direct conversion transmitter.If be applied on the Bluetooth communication, low pass filter 402I and low pass filter 402Q can be designed to the work at centre frequency 1.6MHz, have the bandwidth of 1.5MHz.Though Fig. 5 does not show alignment unit 330, present embodiment still can adopt this alignment unit 330 flexibly to adjust time constant among low pass filter 402I and the 402Q, makes bandwidth meet various possible demands.
Fig. 6 is the structural representation of the embodiment of filter unit 510 among Fig. 5.Low pass filter 402I described in Fig. 5 and 402Q form by operational amplifier 602I and 602Q collocation RC circuit (not shown), are serially connected in separately on homophase passage or the orthogonal channel.The input and output side of operational amplifier 602I and 602Q all is differential right, and corresponding input, output are expressed as P1+, P1-, P2+, P2-, P3+, P3-, P4+ and P4-.When a plurality of operational amplifier 602I formed the ladder framework, the P2+ of previous operational amplifier 602I and P2-coupled P1+ and the P1-of next operational amplifier 602I accordingly.Four distribution controller 502a, 502b, 502c and 502d control the coupling access status of homophase passage and orthogonal channel accordingly.Each distribution controller comprises resistance and switch, as shown in the figure, and resistance R a, Rb, Rc and Rd, and switch SW 1, SW2, SW3 and SW4.Distribution controller 502a is responsible for administering the coupling access status between P1-and the P4+, and distribution controller 502b is responsible for P1+ to P4-, and distribution controller 504a is responsible for P2-to P3-, and distribution controller 504b is responsible for P2+ to P3+.All switches in the present embodiment are unlocked simultaneously or cut out.When these switch opens, filter unit 510 forms band pass filter, and its bandwidth is determined by the RC time constant.On the contrary, when all switches cut out, operational amplifier 602I and 602Q played the part of an independently low pass filter separately, also worked in the bandwidth by the decision of RC time constant.Resistance R a, Rb, Rc and Rd are according to applied scope and the value of elasticity selection, the system of not limiting in the present invention.
Though the present invention with the better embodiment explanation as above is understandable that the not necessarily so qualification of scope of the present invention.Relative, any is that conspicuous improvement is all in covering scope of the present invention based on same spirit or those skilled in the art.
Claims (17)
1. receive-transmit system, but feed signals is sent data with in obtaining in the demodulation radio frequency, and will to send data-modulated outside be the outer feed signals of radio frequency, it is characterized in that this receive-transmit system comprises:
Share the formula filtration module, optionally work in first pattern and second pattern of the signal that is used for filtering first bandwidth and second bandwidth respectively, wherein, above-mentioned first bandwidth is different with above-mentioned second bandwidth;
Demodulation module, be coupled to above-mentioned shared formula filtration module, feed signals demodulation in being used in above-mentioned first pattern above-mentioned radio frequency and produce first demodulation result, and above-mentioned first demodulation result is sent to above-mentioned shared formula filtration module filters, to produce first filter result of above-mentioned first bandwidth;
First baseband module is coupled to above-mentioned shared formula filtration module, is used in above-mentioned first pattern the above-mentioned first filter result digitlization, send data to produce in above-mentioned;
Second baseband module, be coupled to above-mentioned shared formula filtration module, be used in above-mentioned second pattern the above-mentioned digital simulationization of sending outside, send baseband signal outside with generation, and the above-mentioned baseband signal of sending outside delivered to above-mentioned shared formula filtration module and filter, to produce second filter result of above-mentioned second bandwidth; And
Radio-frequency module is coupled to above-mentioned shared formula filtration module, is used in above-mentioned second pattern above-mentioned second filter result being modulated, to produce the outer feed signals of above-mentioned radio frequency.
2. receive-transmit system as claimed in claim 1 is characterized in that, above-mentioned shared formula filtration module comprises:
The composite type filter has in-phase input end, orthogonal input, in-phase output end and quadrature output;
Homophase input selector and quadrature input selector, be used for when above-mentioned first pattern, above-mentioned demodulation module being couple to above-mentioned in-phase input end and above-mentioned orthogonal input, and when above-mentioned second pattern, above-mentioned second baseband module be couple to above-mentioned in-phase input end and above-mentioned orthogonal input; And
Homophase outlet selector and quadrature outlet selector, be used for when above-mentioned first pattern, above-mentioned first baseband module being couple to above-mentioned in-phase output end and above-mentioned quadrature output, and when above-mentioned second pattern, above-mentioned radio-frequency module be couple to above-mentioned in-phase output end and above-mentioned quadrature output.
3. receive-transmit system as claimed in claim 2 is characterized in that, combinations thereof formula filter comprises:
The homophase low pass filter, its input is coupled to above-mentioned in-phase input end, and its output is coupled to above-mentioned in-phase output end;
The quadrature low pass filter, its input is coupled to above-mentioned orthogonal input, and its output is coupled to above-mentioned quadrature output;
The distribution controller is used for switching the coupling access status of above-mentioned in-phase input end, above-mentioned quadrature output, above-mentioned in-phase output end and above-mentioned orthogonal input, wherein:
In above-mentioned first pattern, above-mentioned distribution controller is couple to above-mentioned quadrature output with above-mentioned in-phase input end, and above-mentioned in-phase output end is couple to above-mentioned orthogonal input, makes combinations thereof formula filter become band pass filter; And
In above-mentioned second pattern, above-mentioned distribution controller cuts out, thereby above-mentioned homophase low pass filter and above-mentioned quadrature low pass filter are isolated mutually, works alone separately.
4. receive-transmit system as claimed in claim 3, it is characterized in that, further comprise alignment unit and be coupled to above-mentioned homophase low pass filter and above-mentioned quadrature low pass filter, adjust the capacity resistance cime constant of above-mentioned homophase low pass filter and above-mentioned quadrature low pass filter and calibrate above-mentioned first and second bandwidth.
5. receive-transmit system as claimed in claim 2 is characterized in that, combinations thereof formula filter is a hierarchic structure, comprise the filter unit of a plurality of series connection, and each filter unit comprises:
The homophase low pass filter has the first input end and first output;
The quadrature low pass filter has second input and second output;
The first distribution controller is couple to above-mentioned second output with above-mentioned first input end when starting;
The second distribution controller is couple to above-mentioned first output with above-mentioned second input when starting; Wherein in the filter unit of above-mentioned a plurality of series connection:
First output of last homophase low pass filter connects the first input end of next homophase low pass filter, and second output of last quadrature low pass filter connects second input of next quadrature low pass filter;
The first input end of the most previous homophase low pass filter is exactly above-mentioned in-phase input end, and second input of the most previous quadrature low pass filter is exactly above-mentioned orthogonal input;
First output of last homophase low pass filter is exactly above-mentioned in-phase output end, and second output of last quadrature low pass filter is exactly above-mentioned quadrature output;
In above-mentioned first pattern, the above-mentioned first and second distribution controllers all are activated, thereby make combinations thereof formula filter become band pass filter; And
In above-mentioned second pattern, the above-mentioned first and second distribution controllers all are closed, thereby above-mentioned homophase low pass filter and above-mentioned quadrature low pass filter are isolated mutually, work alone separately.
6. receive-transmit system as claimed in claim 2 is characterized in that, combinations thereof formula filter is a hierarchic structure, comprise the filter unit of a plurality of series connection, and each filter unit comprises:
Be serially connected with first operational amplifier on the homophase passage, and be serially connected with second operational amplifier on the orthogonal channel, respectively comprise pair of differential input and pair of differential output;
The first distribution controller is used for controlling the coupling access status of the negative output terminal of the negative input end of above-mentioned first operational amplifier and above-mentioned second operational amplifier;
The second distribution controller is used for controlling the coupling access status of the positive output end of the positive input terminal of above-mentioned first operational amplifier and above-mentioned second operational amplifier;
The 3rd distribution controller is used for controlling the coupling access status of the negative input end of the positive output end of above-mentioned first operational amplifier and above-mentioned second operational amplifier;
The 4th distribution controller is used for controlling the coupling access status of the positive input terminal of the negative output terminal of above-mentioned first operational amplifier and above-mentioned second operational amplifier; Wherein:
In above-mentioned first pattern, the above-mentioned first, second, third and the 4th distribution controller all is activated, thereby makes combinations thereof formula filter become band pass filter; And
In above-mentioned second pattern, the above-mentioned first, second, third and the 4th distribution controller all is closed, thereby makes combinations thereof formula filter become two independently low pass filters.
7. receive-transmit system as claimed in claim 6 is characterized in that:
The above-mentioned first distribution controller comprises first resistance of connecting with first switch;
The above-mentioned second distribution controller comprises second resistance of connecting with second switch;
Above-mentioned the 3rd distribution controller comprises the 3rd resistance of connecting with the 3rd switch;
Above-mentioned the 4th distribution controller comprises the 4th resistance of connecting with the 4th switch; And
In above-mentioned first pattern, the above-mentioned first, second, third and the 4th switch all is activated, and in above-mentioned second pattern, the above-mentioned first, second, third and the 4th switch all is closed.
8. receive-transmit system as claimed in claim 1 is characterized in that:
Above-mentioned first pattern is a receiving mode, and wherein above-mentioned shared formula filtration module provides the function of band pass filter, and only the signal for above-mentioned first bandwidth passes through, and makes above-mentioned receive-transmit system become the Low Medium Frequency receiver; And
Above-mentioned second pattern is a transfer mode, and wherein above-mentioned shared formula filtration module provides the function of low pass filter, and only the signal for above-mentioned second bandwidth passes through, and makes above-mentioned receive-transmit system become the zero intermediate frequency reflector.
9. receive-transmit system as claimed in claim 1 is characterized in that, above-mentioned receive-transmit system is to be applied to transfer mode and the not simultaneous TDMA communication system of receiving mode.
10. receive-transmit system as claimed in claim 1 is characterized in that above-mentioned receive-transmit system is a WLAN, bluetooth or global system for mobile communications.
11. receive-transmit system as claimed in claim 1 is characterized in that, above-mentioned demodulation module comprises:
Low noise amplifier is used for receiving the interior feed signals of above-mentioned radio frequency and it is amplified control;
First frequency mixer produces feed signals mixing in the above-mentioned radio frequency in-phase component of above-mentioned first demodulation result on the homophase passage; And
Second frequency mixer produces feed signals mixing in the above-mentioned radio frequency quadrature component of above-mentioned first demodulation result on orthogonal channel.
12. receive-transmit system as claimed in claim 1 is characterized in that, above-mentioned first baseband module comprises:
First variable gain amplifier is used for the adjustment that gains of in-phase component to above-mentioned first filter result;
First analog to digital converter is coupled to the output of above-mentioned first variable gain amplifier, is used for producing the in-phase component of sending data in above-mentioned;
Second variable gain amplifier is used for the adjustment that gains of quadrature component to above-mentioned first filter result; And
Second analog to digital converter is coupled to the output of above-mentioned second variable gain amplifier, is used for producing the quadrature component of sending data in above-mentioned.
13. receive-transmit system as claimed in claim 1 is characterized in that:
The above-mentioned data of sending outside comprise in-phase component and quadrature component; And
Above-mentioned second baseband module comprises:
First digital to analog converter is used for converting the above-mentioned in-phase component of sending data outside to the above-mentioned in-phase component of sending baseband signal outside; And
Second digital to analog converter is used for converting the above-mentioned quadrature component of sending data outside to the above-mentioned quadrature component of sending baseband signal outside.
14. receive-transmit system as claimed in claim 1 is characterized in that, above-mentioned radio-frequency module comprises:
First upconverter is used for in-phase component raising frequency with above-mentioned second filter result;
Second upconverter is used for quadrature component raising frequency with above-mentioned second filter result;
Variable gain amplifier is coupled to above-mentioned first and second upconverter, to the raising frequency result of above-mentioned first and second upconverter adjustment that gains, to produce the outer feed signals of above-mentioned radio frequency; And
Power amplifier is used for the outer feed signals of above-mentioned radio frequency is carried out power amplification with external emission.
15. a composite type filter is applied to receive-transmit system, comprises:
In-phase input end, orthogonal input, in-phase output end, and quadrature output;
The homophase low pass filter, its input is coupled to above-mentioned in-phase input end, and its output is coupled to above-mentioned in-phase output end;
The quadrature low pass filter, its input is coupled to above-mentioned orthogonal input, and its output is coupled to above-mentioned quadrature output;
The distribution controller optionally is coupled to above-mentioned in-phase input end, above-mentioned quadrature output, above-mentioned in-phase output end and above-mentioned orthogonal input, wherein:
In receiving mode, above-mentioned distribution controller is couple to above-mentioned quadrature output with above-mentioned in-phase input end, and above-mentioned in-phase output end is couple to above-mentioned orthogonal input, make above-mentioned homophase low pass filter and above-mentioned quadrature low pass filter couple the formation band pass filter mutually; And
In transfer mode, above-mentioned distribution controller cuts out, thereby above-mentioned homophase low pass filter and above-mentioned quadrature low pass filter are isolated mutually, works alone separately.
16. a composite type filter is applied to receive-transmit system, it is characterized in that, this composite type filter comprises:
In-phase input end, orthogonal input, in-phase output end, and quadrature output;
A plurality of filter units are connected and are formed hierarchic structure, and each filter unit comprises:
The homophase low pass filter has the first input end and first output;
The quadrature low pass filter has second input and second output;
The first distribution controller is couple to above-mentioned second output with above-mentioned first input end when starting;
The second distribution controller is couple to above-mentioned first output with above-mentioned second input when starting; Wherein:
In the filter unit of above-mentioned a plurality of series connection:
First output of last homophase low pass filter connects the first input end of next homophase low pass filter, and second output of last quadrature low pass filter connects second input of next quadrature low pass filter;
The first input end of the most previous homophase low pass filter is exactly above-mentioned in-phase input end, and second input of the most previous quadrature low pass filter is exactly above-mentioned orthogonal input;
First output of last homophase low pass filter is exactly above-mentioned in-phase output end, and second output of last quadrature low pass filter is exactly above-mentioned quadrature output;
In receiving mode, the above-mentioned first and second distribution controllers all are activated, thereby make combinations thereof formula filter become band pass filter; And
In transfer mode, the above-mentioned first and second distribution controllers all are closed, thereby above-mentioned homophase low pass filter and above-mentioned quadrature low pass filter are isolated mutually, work alone separately.
17. a composite type filter is applied to receive-transmit system, it is characterized in that, this composite type filter comprises:
In-phase input end, orthogonal input, in-phase output end, and quadrature output;
A plurality of filter units are connected and are formed hierarchic structure, and each filter unit comprises:
Be serially connected in first operational amplifier on the homophase passage, and be serially connected in second operational amplifier on the orthogonal channel, respectively comprise pair of differential input and pair of differential output;
The first distribution controller is used for controlling the coupling access status of the negative output terminal of the negative input end of above-mentioned first operational amplifier and above-mentioned second operational amplifier;
The second distribution controller is used for controlling the coupling access status of the positive output end of the positive input terminal of above-mentioned first operational amplifier and above-mentioned second operational amplifier;
The 3rd distribution controller is used for controlling the coupling access status of the negative input end of the positive output end of above-mentioned first operational amplifier and above-mentioned second operational amplifier;
The 4th distribution controller is used for controlling the coupling access status of the positive input terminal of the negative output terminal of above-mentioned first operational amplifier and above-mentioned second operational amplifier; Wherein:
In receiving mode, the above-mentioned first, second, third and the 4th distribution controller all is activated, thereby makes combinations thereof formula filter become band pass filter; And
In transfer mode, the above-mentioned first, second, third and the 4th distribution controller all is closed, thereby makes combinations thereof formula filter become two independently low pass filters.
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| US82622206P | 2006-09-20 | 2006-09-20 | |
| US60/826,222 | 2006-09-20 |
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| CN101867350B (en) * | 2009-04-17 | 2013-08-21 | 杭州中科微电子有限公司 | Zero-intermediate-frequency/low-intermediate-frequency configurable variable gain amplifier |
| JP2012239016A (en) * | 2011-05-11 | 2012-12-06 | Lapis Semiconductor Co Ltd | Receiver control and control method for multiplex filter |
| CN103684330A (en) * | 2012-09-18 | 2014-03-26 | 北京中电华大电子设计有限责任公司 | Medium frequency filter simultaneously applied to wireless receiver and transmitter |
| CN108092642A (en) * | 2017-12-18 | 2018-05-29 | 南京中感微电子有限公司 | A kind of multiplexing mode filter |
| CN110768693B (en) * | 2018-07-26 | 2022-01-07 | 瑞昱半导体股份有限公司 | Dual-mode wireless transceiver |
| CN111669148B (en) * | 2020-06-19 | 2023-03-14 | 中国电子科技集团公司第二十六研究所 | Tunable bandpass filter, apparatus and method |
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| CN1328723A (en) * | 1998-11-26 | 2001-12-26 | 诺基亚移动电话有限公司 | Method and arrangement for transmitting and receiving RF signals through various radio interfaces of communication systems |
| CN1677882A (en) * | 2004-04-02 | 2005-10-05 | 大唐移动通信设备有限公司 | Message machine of receiving-transmitting time-division duplex wireless communication system |
| CN1759583A (en) * | 2003-03-12 | 2006-04-12 | 皇家飞利浦电子股份有限公司 | Transceiver with I/Q mismatch compensation scheme |
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| GB2272605B (en) * | 1992-11-11 | 1996-11-27 | Nokia Mobile Phones Uk | Radio frequency circuit for a time division multiple access system |
| US5331222A (en) * | 1993-04-29 | 1994-07-19 | University Of Maryland | Cochlear filter bank with switched-capacitor circuits |
| JPH0865108A (en) * | 1994-06-15 | 1996-03-08 | Tokai Univ | Switched capacitor filter |
| US6728517B2 (en) * | 2002-04-22 | 2004-04-27 | Cognio, Inc. | Multiple-input multiple-output radio transceiver |
| TWI364175B (en) * | 2003-08-28 | 2012-05-11 | Gct Semiconductor Inc | System and method for filtering signals in a transceiver |
| US7463864B2 (en) * | 2004-04-09 | 2008-12-09 | Broadcom Corporation | Modified dual band direct conversion architecture that allows extensive digital calibration |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1328723A (en) * | 1998-11-26 | 2001-12-26 | 诺基亚移动电话有限公司 | Method and arrangement for transmitting and receiving RF signals through various radio interfaces of communication systems |
| CN1759583A (en) * | 2003-03-12 | 2006-04-12 | 皇家飞利浦电子股份有限公司 | Transceiver with I/Q mismatch compensation scheme |
| CN1677882A (en) * | 2004-04-02 | 2005-10-05 | 大唐移动通信设备有限公司 | Message machine of receiving-transmitting time-division duplex wireless communication system |
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| TWI348269B (en) | 2011-09-01 |
| CN101150328A (en) | 2008-03-26 |
| DE102007045102B4 (en) | 2016-02-04 |
| TW200816627A (en) | 2008-04-01 |
| DE102007045102A1 (en) | 2008-08-07 |
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