CN201191826Y - Multi-mode mobile communication terminal and radio frequency receiver unit thereof - Google Patents
Multi-mode mobile communication terminal and radio frequency receiver unit thereof Download PDFInfo
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- CN201191826Y CN201191826Y CNU2008200460575U CN200820046057U CN201191826Y CN 201191826 Y CN201191826 Y CN 201191826Y CN U2008200460575 U CNU2008200460575 U CN U2008200460575U CN 200820046057 U CN200820046057 U CN 200820046057U CN 201191826 Y CN201191826 Y CN 201191826Y
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- communication terminal
- mobile communication
- receiving
- multimode mobile
- receiving filter
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Abstract
The utility model discloses a multimode mobile communication terminal and a radio frequency receiving circuit of the multimode mobile communication terminal, wherein the disturbance of a radio frequency emission signal of a transmitting end of one communication module to a receiving signal of the other radio frequency emission signal can be greatly attenuated through arranging corresponding band-pass filters and matching circuits with shapes like doors on an receiving end of each communication module of the multimode mobile communication terminal, pass band fluctuation of the receiving signal of a receiver can be lowered, and the flatness of the receiver in the whole pass band and the pass band group delay property of the receiver are improved, thereby improving the communication quality of the multimode mobile communication terminal.
Description
Technical field
The utility model relates to moving communicating field, relates in particular to a kind of multimode mobile communication terminal and radio-frequency (RF) receiving circuit thereof.
Background technology
At moving communicating field, in numerous standards and network coexisted today, can be applied at least two communication systems, be applicable to that the double-mode communication terminal of at least two kinds of communication patterns can provide smooth excessiveness for the differentiation of each communication system of coexistence.The user who uses double-mode communication terminal not only can be easily adopt different system all over the world between roam, and according to the speech quality and the charging way of different system switch at any time better, more cheap network.We can say that double-mode communication terminal combines all advantages of two kinds of network technologies, therefore have very big market prospects.
Occurred some multimode mobile communication terminals now on the market, for example, Fig. 1 shows a kind of existing pair of standby communication terminal.It includes two basic communication modules, wherein, these two communication modules can adopt identical communication pattern (as, be all GSM), also can adopt different communication pattern (for GSM, another one is DCS as one of them).Two modules standbies simultaneously and communicating.Wherein, communications status can comprise the transmitting-receiving note, connect make a phone call, transfer of data and enjoy the active state that other value-added services etc. take network.When the standby simultaneously of two kinds of patterns, the working frequency range of the two kinds of mode signals distance of being separated by no matter, because single mode communication terminal and subsidiary communications module card are positioned at same housing, and the dual-mode antenna of two-mode works simultaneously, therefore all is difficult to avoid two kinds of radio frequency cross between the mode signal to disturb.To be example among this Fig. 1, the radio frequency cross of above-mentioned two kinds of mode signals is disturbed the following three kinds of situations that mainly comprise:
(1) first communication module when emission (during the work of first transmitter), the transmitting of first communication module to the interference of the received signal of second communication module;
(2) second communication module when emission (during the work of second transmitter), the transmitting of second communication module to the interference of the received signal of first communication module;
(3) one of them communication module is in emission, reception and idle condition, the interference that spurious emissions signal (spurious emissions) receives another communication module;
From the above, transmitting of one of them communication module may produce interference to the received signal of another communication module.Particularly when two communication modules are the GSM pattern, when this portable terminal under holding state, can produce the phase mutual interference between two GSM networks.Promptly the radiating circuit of a GSM network produces another GSM network receiving circuit and disturbs, we claim this interference to be " two G disturb mutually ", thisly disturb more seriously mutually, make its receiving sensitivity the decline of 10 several dB generally all be arranged, be difficult to satisfy the two requirements to be networked of country compared with single standby.
In existing technology, two kinds of approach of main employing reduce two GSM and disturb mutually, approach one: two cover radio circuit uses two antennas, and two antennas are placed on the two ends of mobile phone respectively, reduces the effects of disturbing mutually between the two cover networks by the isolation that increases antenna.Approach two: two receiving filters of connecting between two GSM receivers and switch simultaneously, reduce interference by filter to the inhibitory action of out of band signal.
But, be used for reducing the method that two G disturb mutually in the prior art and have following weak point:
For approach one, it is limited to the effect that reduces two G and disturb mutually to increase isolation between antennas;
For approach two, at receiving terminal two receiving filters of connecting simultaneously, can destroy group delay characteristic in the flatness of receiving terminal receiving sensitivity and the receiver band, it is better to make the GSM network receive segment sensitive degree at some, and the sensitivity of some frequency range is relatively poor; Make the multipath fading degradation simultaneously.
The utility model content
In view of this, the utility model embodiment technical problem to be solved is, a kind of multimode mobile communication terminal and radio-frequency (RF) receiving circuit thereof are provided, can improve the fluctuation of the sensitivity of the received passband in the multimode mobile communication terminal, the sensitivity that makes all receive frequency range can both be satisfied application requirements.
For solving the problems of the technologies described above, a kind of multimode mobile communication terminal of the utility model embodiment comprises at least two communication modules, and wherein at least one communication module comprises:
Antenna;
The duplexer that is connected with described antenna;
Be used to receive receiver from the radiofrequency signal of antenna;
Be used to send the transmitter of radiofrequency signal;
The baseband processing module that is connected respectively with described receiver and transmitter;
Be connected first receiving filter and second receiving filter between described duplexer and the receiver, the radiofrequency signal that is received that is used for decaying receives the outer signal of frequency range;
Be connected the ∏ type match circuit between described first receiving filter and second receiving filter.
Preferably, described ∏ type match circuit is a passive circuit.
Preferably, described first receiving filter and second receiving filter are the band pass filter corresponding to the band downlink of respective communication pattern.
Preferably, pairing two communication patterns of described two communication modules are any one or two kinds among GSM850, GSM900, PCS, DCS, PHS, CDMA2000, WCDMA, TD-SCDMA, the WiFi.
Correspondingly, a kind of multimode mobile communication terminal radio-frequency (RF) receiving circuit of the utility model embodiment comprises:
Antenna;
The duplexer that is connected with described antenna;
Be used to receive receiver from the radiofrequency signal of antenna;
The baseband processing module that is connected with described receiver;
Be connected first receiving filter and second receiving filter between described duplexer and the described receiver, the radiofrequency signal that is received that is used for decaying receives the outer signal of frequency range;
Be connected the ∏ type match circuit between described first receiving filter and second receiving filter.
Preferably, described ∏ type match circuit is a passive circuit.
Preferably, described first receiving filter and second receiving filter are the band pass filter corresponding to the band downlink of respective communication pattern.
Implement multimode mobile communication terminal and the radio-frequency (RF) receiving circuit thereof of the utility model embodiment, by in the middle of two receiving filters of each communication module of multimode mobile communication terminal, increasing ∏ type match circuit, to improve two matching relationships between the filter, can reduce the passband fluctuation of receiver received signal, improve receiver in whole passband flatness and the receiver band in the group delay characteristic, thereby the sensitivity and the multipath fading performance that make all receive frequency ranges can both satisfy application requirements.
Description of drawings
Fig. 1 is the structural representation of existing multimode mobile communication terminal;
Fig. 2 is the structural representation of existing another kind of multimode mobile communication terminal;
Fig. 3 is the structural representation of the utility model first embodiment;
Fig. 4 is the schematic diagram of an embodiment of ∏ type match circuit among Fig. 3.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described.
As shown in Figure 3, be the structural representation of first embodiment of the present utility model.Described mobile communication terminal is multi-module mobile terminal (as a dual-standby handset), it includes at least two communication modules (there is shown two), be operated in respectively under the different patterns, this two different pattern can be such as any two kinds in GSM850, GSM900, PCS, DCS, PHS, CDMA2000, WCDMA, TD-SCDMA, these patterns of WiFi, certainly these two communication modules also can be operated under the identical mode of operation, as can all being operated under the GMS pattern.Do at GSM850 with the first communication module formula below, and second communication module is operated in GSM900 and describes for example down.
Each communication module includes among the figure:
Be used to receive and launch the antenna of different mode radiofrequency signal, this antenna can be a plurality of, perhaps adopts integrated dual-mode/multi-mode antenna;
With the duplexer that described antenna is connected, be used to select respective antenna to launch or receive, also can be called as duplexer;
Receiver is used to receive the radiofrequency signal from antenna;
Transmitter is used to send radiofrequency signal to be sent, can comprise radio frequency amplifier and radiofrequency launcher in this transmitter, is used to amplify and launch radiofrequency signal to be sent;
The baseband processing module that is connected respectively with described receiver and transmitter;
In each communication terminal, also comprise at least two receiving filters (first receiving filter and second receiving filter) that are connected between described duplexer and the described receiver, the signal outside the working frequency range that receives from antenna that is used for decaying significantly; And being connected sending filter (not shown) between described duplexer and the described radio frequency amplifier, the outer signal of its transmit frequency band is used for decaying significantly.Need to prove that described at least two receiving filters can be the same or different.
When specific implementation, in first communication module, be connected at least two receiving filters between first duplexer and first receiver, it is a band pass filter, and the received signal that is used for decaying significantly is corresponding to the signal beyond the reception frequency range of first communication pattern.Because this first communication pattern is GSM850 in Fig. 3, its downstream frequency is 869～894MHZ, so this receiving filter is the band pass filter of 869～894MHZ.One first sending filter is set between first duplexer and first radio frequency amplifier, and this first sending filter is used for decaying significantly and sends this first communication pattern of signal and send signal beyond frequency range.Because this first communication pattern is GSM850 in Fig. 3, its upstream frequency is 824～849MHZ, so first sending filter is the band pass filter of 824～849MHZ.
In like manner, in second communication module, receiving filter is corresponding to second communication pattern (GSM900) band downlink (935～960MHZ) band pass filter; And second sending filter is corresponding to second communication pattern (GSM900) uplink band (890～915MHZ) band pass filter.
In addition, above-mentioned parts and similar of the prior art are not elaborated at this, and improvements of the present utility model are, between first receiving filter of each communication module and second receiving filter ∏ type match circuit are set.Owing to be subjected to the restriction of existing manufacturing process and technical merit, existing filter exists passband fluctuation in whole passband, this has also determined to exist passband fluctuation by the received signal after the filter, when adopting two filters (first receiving filter and second filter) when directly linking to each other, can make the passband fluctuation aggravation of received signal, directly cause receiver some frequency range receptivity in receiving frequency range better, can better meet the two requirements to be networked of country, and some frequency range receptivity deviation, and can't satisfy the two requirements to be networked of country.And in embodiment of the present utility model, by increasing ∏ type match circuit, can improve two matching relationships between the filter, can reduce the passband fluctuation of receiver received signal, improve the flatness of receiver in whole passband, thereby make the receiving sensitivity of whole reception frequency range can satisfy actual requirement, can also improve the multipath fading performance of receiver simultaneously.And the size of the value by adjusting each device of ∏ type match circuit, this method for designing can be applied in the design of different pcb boards.∏ type match circuit described in the utility model embodiment can be the ∏ type match circuit (as shown in Figure 4) by electric capacity (C1) formation of the inductance (L1, L2) of two parallel connections and a series connection, it is passive ∏ type match circuit, certainly, also can adopt the ∏ type match circuit of other types.
In other embodiment, also can only improve one of them communication module (as first communication module or second communication module), other communication modules still adopt existing structure.Can reduce transmitting of one of them communication module so to a certain extent to the interference of the received signal of another communication module.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (9)
1, a kind of multimode mobile communication terminal comprises at least two communication modules, and wherein at least one communication module comprises:
Antenna;
The duplexer that is connected with described antenna;
Be used to receive receiver from the radiofrequency signal of antenna;
Be used to send the transmitter of radiofrequency signal;
The baseband processing module that is connected respectively with described receiver and transmitter;
Be connected first receiving filter and second receiving filter between described duplexer and the receiver, the radiofrequency signal that is received that is used for decaying receives the outer signal of frequency range;
It is characterized in that, further comprise:
Be connected the ∏ type match circuit between described first receiving filter and second receiving filter.
2, multimode mobile communication terminal as claimed in claim 1 is characterized in that, described ∏ type match circuit is a passive circuit.
3, multimode mobile communication terminal as claimed in claim 2 is characterized in that, described ∏ type match circuit is made of the inductance of two parallel connections and the electric capacity of a series connection.
As each described multimode mobile communication terminal of claim 1 to 3, it is characterized in that 4, described first receiving filter and second receiving filter are the band pass filter corresponding to the band downlink of respective communication pattern.
5, multimode mobile communication terminal as claimed in claim 4, it is characterized in that pairing two communication patterns of described two communication modules are any one or two kinds among GSM850, GSM900, PCS, DCS, PHS, CDMA2000, WCDMA, TD-SCDMA, the WiFi.
6, a kind of multimode mobile communication terminal radio-frequency (RF) receiving circuit comprises:
Antenna;
The duplexer that is connected with described antenna;
Be used to receive receiver from the radiofrequency signal of antenna;
The baseband processing module that is connected with described receiver;
Be connected first receiving filter and second receiving filter between described duplexer and the described receiver, the radiofrequency signal that is received that is used for decaying receives the outer signal of frequency range;
It is characterized in that, further comprise:
Be connected the ∏ type match circuit between described first receiving filter and second receiving filter.
7, multimode mobile communication terminal radio-frequency (RF) receiving circuit as claimed in claim 6 is characterized in that, described ∏ type match circuit is a passive circuit.
8, multimode mobile communication terminal radio-frequency (RF) receiving circuit as claimed in claim 7 is characterized in that, described ∏ type match circuit is made of the inductance of two parallel connections and the electric capacity of a series connection.
As each described multimode mobile communication terminal radio-frequency (RF) receiving circuit of claim 6 to 8, it is characterized in that 9, described first receiving filter and second receiving filter are the band pass filter corresponding to the band downlink of respective communication pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200460575U CN201191826Y (en) | 2008-04-07 | 2008-04-07 | Multi-mode mobile communication terminal and radio frequency receiver unit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200460575U CN201191826Y (en) | 2008-04-07 | 2008-04-07 | Multi-mode mobile communication terminal and radio frequency receiver unit thereof |
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| CN201191826Y true CN201191826Y (en) | 2009-02-04 |
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| CNU2008200460575U Expired - Lifetime CN201191826Y (en) | 2008-04-07 | 2008-04-07 | Multi-mode mobile communication terminal and radio frequency receiver unit thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010148615A1 (en) * | 2009-06-24 | 2010-12-29 | 中兴通讯股份有限公司 | Implementing method for matching frequency bands of mobile terminals, mobile terminal, and mainboard thereof |
| CN102215278A (en) * | 2010-07-30 | 2011-10-12 | 惠州Tcl移动通信有限公司 | Mobile terminal integrating two antennae into a whole and antenna control device thereof |
| CN102394665A (en) * | 2011-06-28 | 2012-03-28 | 中兴通讯股份有限公司 | Radio frequency transceiver system and mobile terminal |
| CN107465444A (en) * | 2012-08-02 | 2017-12-12 | 英特尔德国有限责任公司 | The method that acceptor circuit and such acceptor circuit perform |
-
2008
- 2008-04-07 CN CNU2008200460575U patent/CN201191826Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010148615A1 (en) * | 2009-06-24 | 2010-12-29 | 中兴通讯股份有限公司 | Implementing method for matching frequency bands of mobile terminals, mobile terminal, and mainboard thereof |
| CN102215278A (en) * | 2010-07-30 | 2011-10-12 | 惠州Tcl移动通信有限公司 | Mobile terminal integrating two antennae into a whole and antenna control device thereof |
| CN102394665A (en) * | 2011-06-28 | 2012-03-28 | 中兴通讯股份有限公司 | Radio frequency transceiver system and mobile terminal |
| CN107465444A (en) * | 2012-08-02 | 2017-12-12 | 英特尔德国有限责任公司 | The method that acceptor circuit and such acceptor circuit perform |
| CN107465444B (en) * | 2012-08-02 | 2021-07-06 | 苹果公司 | Receiver circuit and method performed by such a receiver circuit |
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| GR01 | Patent grant | ||
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Granted publication date: 20090204 |
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| CX01 | Expiry of patent term |