CN1179071A

Movatterモバイル変換

Info

Publication number: CN1179071A
Application number: CN97117369A
Authority: CN
Inventors: J·波尔丁
Original assignee: Nokia Mobile Phones Ltd
Current assignee: Nokia Oyj
Priority date: 1996-08-07
Filing date: 1997-08-06
Publication date: 1998-04-15

Abstract

A multi-mode radiotelephone includes at least one antenna for transmitting and receiving RF signals within at least two frequency bands. The radiotelephone also includes a first receiver having an input coupled to the antenna for amplifying and down-converting RF signals within a first frequency band and a second receiver having an input coupled to the antenna for amplifying and down-converting RF signals within a second frequency band. The radiotelephone further includes a first transmitter having an output coupled to the antenna for up-converting and amplifying RF signals within the first frequency band and a second transmitter having an output coupled to the antenna for up-converting and amplifying RF signals within the second frequency band.

Description

Adopt the double frequency-band travelling carriage of cross-coupled reflector and acceptor circuit

The present invention relates generally to radio telephone, more specifically to dual-band radios words or the travelling carriage that can in cellular network, work.

Now the demand of so-called dual-mode terminal or platform was gathered with day and increase.In the U.S., have at least a system to support the dual-mode operation at present, i.e. digital TDMA and simulation FM (IS-136).Along with GSM, PCS and the application more and more widely of DECT system, need and support two kinds of operator schemes such as GSM and PCS, or the travelling carriage of GSM and DECT.Just developing 3-G (Generation Three mobile communication system) at present, as UMTS (among the ETSI) or FPLMTS (among the CCIR), these systems are closely similar, also need certain dual-mode operation.

When the dual-mode communication system is discussed, there are several different modes to define " dual-mode ".The pattern that may switch between these patterns can be an analog/digital, or low/high carrier wave bit rate, or frequency division/time division duplex (FDD/TDD) or switch to another frequency band from a frequency band simply.The dual-mode travelling carriage also can have the various combinations (for example, analog/digital and frequency band 1/ frequency band 2) of these parameters.In present patent application, most interested parameter is that dual-mode and/or frequency band change.

In many travelling carriages, constitute radio frequency (RF) circuit of reflector and receiver with some discrete semiconductor devices.Yet when the needs multiband, the problem that mobile phone manufacturer runs into is electronic component, particularly radio circuit will be put in the bag or box of conventional small size.Volume for fear of hand-held travelling carriage increases, and preferably adopts some integrated components.

Adopting integrated RF circuit is the technology a kind of commonly used of saving the space, can reduce the volume of hand-held travelling carriage simultaneously and reduce power consumption.Yet, when identical integrated circuit is used for analog-and digital-mode transfer, because crosstalking in the integrated circuit just produced problem.When adopting the multiband structure, this cross-interference issue is very complicated.Though also can there be identical problem in the above main cross-interference issue in the integrated circuit of having discussed in adopting thick film or film blended RF circuit.

Interested frequency band can be got very and opens (for example 800MHz and 1900MHz), also can lean on very closely, even overlapping.In addition, in interested frequency band, or for the dual-mode that is used for conventional AMPS, on two kinds of different frequencies, transmit and receive simultaneously.This is a situation about bothering most, because the quality of speech that crosstalking between reflector and the acceptor circuit will make travelling carriage and signaling descends.

Therefore, first purpose of the present invention provides a kind of improved dual-band radios words, and it adopts integrated circuit to realize transmitting and receiving function.

Another object of the present invention provides a kind of improved double frequency-band travelling carriage, and it adopts the cross-coupled signal path that transmits and receives by integrated circuit.

The travelling carriage that constitutes according to embodiments of the invention has solved above-mentioned problem with other, has reached purpose of the present invention.

A kind of multiplex's pattern radio telephone comprises at least one antenna, is used for transmitting and receiving at least two frequency bands the RF signal.This radio telephone also comprises first receiver, and its input and antenna are coupled, and is used for amplifying the RF signal and second receiver with down-conversion first frequency band, and its input and antenna are coupled, and is used for amplifying the RF signal with down-conversion second frequency band.This radio telephone also comprises first reflector, and its output and antenna are coupled, and is used for amplifying the RF signal and second reflector with up-conversion first frequency band, and its output and antenna are coupled, and is used for amplifying the RF signal with up-conversion second frequency band.

According to the present invention, first receiver and second reflector place in the first circuit bag (being interconnection), and second receiver and first reflector place in the second circuit bag, also are interconnections.The first and second circuit bags can be integrated circuits, also can be hybrid circuits.

In most preferred embodiment of the present invention, radio telephone also comprises first local oscillator that is used for first frequency band, second local oscillator that is used for second frequency band, and switching device shifter, this device can with or the output of first local oscillator, perhaps with the first and second circuit bags that are outputted to of second local oscillator.

This radio telephone also comprises first duplexer, is used for first receiver and first reflector and antenna are coupled, and second duplexer, is used for second receiver and second reflector and antenna are coupled.

The present invention also provides switch, is used for working power is offered first receiver and second receiver only one selectively, also is used for working power is offered first reflector and second reflector only one selectively.

By below in conjunction with accompanying drawing to the detailed description that the present invention did, it is very clear that above-mentioned feature of the present invention and further feature all will become, wherein:

Fig. 1 is the block diagram according to travelling carriage of the present invention;

Fig. 2 is the stereogram of travelling carriage shown in Figure 1, and this figure also represents cellular communications system, and travelling carriage is by wireless RF link and cellular communications system is two-way is coupled; And

Fig. 3 is the schematic diagram of reflector according to an embodiment of the invention and acceptor circuit.

Below with reference to Fig. 1 and Fig. 2, describe to be applicable to wireless user terminal of the present invention or travellingcarriage 10, for example dual-mode cellular radio telephone or personal communication equipment, but be not limited thereto.Dual-mode travelling carriage 10 comprisesantenna 12, is used for transmitting and frombase station 30 received signals to base station 30.Base station 30 is parts of cellular network, and cellular network is made up of the BMI32 that comprises mobile switching centre (MSC) 34.When travellingcarriage 10 was registered in network, MSC 34 realizations were connected with the landline trunk line.Dual-mode travelling carriage 10 utilizes for example different modulation types (for example PI/4-DQPSK and FM) can set up radio communication with different frequency bands (for example 800MHz AMPS or TDMA and 1900 PCS).Digital TDMA, digital CDMA, hybrid TDMA/CDMA and duplex analog FM travelling carriage are all within the scope of the present invention.

Travelling carriage 10 can comprise dual-mode modulator (MOD) 14a, reflector 14, receiver 16 and demodulator (DEMOD) 16a.Controller 18 provides signal to reflector 14 and receiver 16 respectively, and from reflector 14 and receiver 16 received signals.But these signals comprise the data according to the signaling information of the broadcasting Interface Standard of applicable cellular system and user speech and/or user's generation.

User interface comprises conventional earphone orloud speaker 17,conventional microphone 19, anddisplay 20, and user input apparatus generally are keyboards, these all link to each other with controller 18.Keyboard 22 comprise the numerical key (0-9) of the routine that is used to operate travellingcarriage 10 and relevant key (#,^*) 22a, and other key 22b.Theseother key 22b can comprise and for example sends key, various menu rollings and soft key, and PWR key.

Travellingcarriage 10 also comprises various memories, and the concentrated area is represented with memory 24, wherein is stored in many contents of travelling carriage operating period controller 18 uses etc.For example, memory 24 various cellular system parameter values of storage and digital distribution modules (NAM).The operation sequence of control controller 18 operations also is stored in (generally in the ROM device) in the memory 24.Memory 24 can also be stored the data that comprise user message, and this was receiving fromBMI 32 before user's display message.Travellingcarriage 10 also comprisesbattery 26, and this battery provides electric energy to the required various circuit of operation travelling carriage.

It should be understood that travellingcarriage 10 can be vehicle-mounted and hand-held device.It will also be appreciated that travellingcarriage 10 can operate under one or more broadcasting Interface Standards, as modulation type and access type.For example, travelling carriage can be operated under any standard of the many standards that comprise IS-91, IS-136, GSM, DECT, PCS, UMTS, FPLMTS and IS-95.According to the present invention, travelling carriage also can be used for the AMPS (NAMPS) and the TACS of narrow-band.The invention is not restricted to the travelling carriage of any particular type or broadcast interface standard.

The circuit of reflector shown in Figure 1 14 and receiver 16 is described in more detail referring now to Fig. 3.

Fig. 3 represents dual band transmitter/receiver (transceiver) part of travelling carriage 10.Though described below is two frequency bands, principle of the present invention can be used for the frequency band more than three or three.The signal ofantenna 12 frequency acceptance bands 1.Antenna 12 has two

antenna

12a and 12b, when the frequency band of transceiver changes, can switch this two frequency bands by switch 13.Also can adopt single all channel antenna, thus cancellation switch 13.The signal of the frequency band of accepting 1 arrives frequency band 1 low noise amplifier (LNA) 30 through frequency band 1 duplexer 15a.The output of LNA 30 offerslow pass filter 32, arrives RF down-conversion mixer 34 then.Present first local oscillator (LO1) signal throughbuffer 36 to frequency mixer 34.The input ofbuffer 36 is from LO switching device shifter 38.The output offrequency mixer 34 is first intermediate frequency (IF) signals, and this signal is sent toIF buffer 40, and the output ofIF buffer 40 offers IF low pass filter 42.Frequency mixer 34 is down-converted to an IF with the signal of the frequency band 1 of reception, and it equals the difference frequency between frequency band 1 and the LO1.Except adopting second local oscillator (LO2) frequency, second frequency band, 2receiving circuit 30a, 32a, 34a, 36a and 40a operate independently.

It should be noted that the receiving circuit of first frequency band 1 and second frequency band 2 separately places integratedcircuit bag 29a and 29b.

According to the present invention, frequency band 1 reflector up-conversion mixer 44 is arranged inintegrated circuit bag 29b, and this circuit bag comprises frequency band 2 receiving circuits.In a similar fashion, frequency band 2 reflector up-conversion mixer 44a are arranged in integrated circuit bag 29a, and this circuit bag comprises frequency band 1 receiving circuit.Like this, the circuit of frequency band 1 and frequency band 2 is considered to " interconnection ", thereby has eliminated the signal cross-talk that transmits and receives during the duplex operation between the circuit.In other words, frequency band 1 down-conversion mixer 34 is arranged in identical integrated circuit bag with frequency band 1 up-conversion mixer 44 and their relevant amplifiers, (during promptly adopting receiver and transmitter circuit simultaneously) during the duplex operation, will there be undesirable signal cross-talk between these circuit so.Identical situation also is applicable to frequency band 2 circuit.By adopting interconnection, the invention solves these problems as Fig. 3.

Continue below transmitter circuit is discussed, the emission path of frequency band 1 comprises LO1 buffer 46, and it will inject signal and deliver to up-conversion mixer 44 through the LO1 of buffering.The modulating input signal (MOD) of representing the frame 14a from Fig. 1 of voice, data and/or signaling information to obtain is sent to second input of up-conversion mixer 44.The output of up-conversion mixer 44 is sent tobuffer amplifier 48, and the output of this amplifier links to each other with the output of integrated circuit 29b.Next, the signal of the frequency band 1 through cushioning is sent to the power amplifier part of frequency band 1, and power amplifier partly compriseslow pass filter 50,buffer amplifier 52, variable gain amplifier (VGA) 54 andpower amplifier 56 and 58.The output of power amplifier is the radiation frequency f of frequency band 1_TX1, it is sent to frequency band 1 duplexer 15a, and delivers tosuitable antenna 12a and 12b.Except adopting LO2 as up-conversion mixer 44a and the employing frequency band 2duplexer 15b, the formation of frequency band 2 transmitter circuits is identical.

As shown in Figure 3,

power switch circuit

60a and 60b provide working power to frequency band 1 that places integratedcircuit 29a and 29b and frequency band 2 circuit selectively, and present embodiment is assumed to reception and radiating portion provides independent power supply terminal.Like this, the reflector of 10 pairs of current obsolete frequency bands of travelling carriage and acceptor circuit outage.

Though invention has been described in conjunction with most preferred embodiment, it should be understood that, concerning one of ordinary skill in the art, can do various modifications.For example as mentioned above, the present invention is used for the multiplex's pattern device that can operate under two or more frequency bands.In addition, the invention is not restricted to be used for transceiver integrated circuit, can also be used for the hybrid circuit bag, the integrated circuit (IC) chip of for example wherein separating is installed on the insulated substrate, and interconnects with thick film or thin film conductor.In other embodiments of the invention, circuit element can be adopted, and different types can be adopted greater or less than above number.For example, the outside of circuit bag can provide LOslow middle amplifier 36 and 46.In addition, though described hand-held above or vehicle-mounted travelling carriage, it should be understood that the present invention's can also be used for packing into dual-mode radio Phone unit of miscellaneous equipment, for example radio modem and facsimile machine, and PCMCIA module and the similar devices that is used for digital processing unit.

Though it should be understood that in conjunction with two independently local oscillation signal (LO1 and LO2) the present invention has been described, adopting can be with the single local oscillator of two frequency bands also within the scope of the invention.

Adopt Direct Conversion or directly modulation technique also within the scope of the invention, for example, before emission the RF carrier wave directly and audio frequency or signaling information mixing, thereby saved up-conversion mixer in the reflector path.In such system, also can save down-conversion mixer, make an IF identical with the IF that receives substantially like this.

Though above invention has been described in conjunction with most preferred embodiment, it should be understood that under the prerequisite that does not depart from the scope of the present invention with spirit, one of ordinary skill in the art can be done the modification on various forms and the details.

Claims

1. multiplex's pattern radio telephone comprises:

At least one antenna is used for transmitting and receiving the RF signal at least two frequency bands;

First receiver, its input and described at least one antenna are coupled, and are used for amplifying the RF signal with down-conversion first frequency band;

Second receiver, its input and described at least one antenna are coupled, and are used for amplifying the RF signal with down-conversion second frequency band;

First reflector, its output and described at least one antenna are coupled, and are used for amplifying the RF signal with up-conversion first frequency band;

Second reflector, its output and described at least one antenna are coupled, and are used for amplifying the RF signal with up-conversion second frequency band; Wherein

Described first receiver and described second reflector place in the first circuit bag, and described second receiver and described first reflector place in the second circuit bag.

2. multiplex's pattern radio telephone as claimed in claim 1, the wherein said first and second circuit bags are integrated circuit bags.

3. multiplex's pattern radio telephone as claimed in claim 1, the wherein said first and second circuit bags are the hybrid circuit bags that adopt at least a thick film or film interconnection.

4. multiplex's pattern radio telephone as claimed in claim 1 further comprises:

First local oscillator that is used for first frequency band;

Second local oscillator that is used for second frequency band; And

Switching device shifter, this device can with or the output of first local oscillator, perhaps with the first and second circuit bags that are outputted to of second local oscillator.

5. multiplex's pattern radio telephone as claimed in claim 1 further comprises:

First duplexer is used for described first receiver and described first reflector and described at least one antenna are coupled; And

Second duplexer is used for described second receiver and described second reflector and described at least one antenna are coupled.

6. multiplex's pattern radio telephone as claimed in claim 1 further comprises:

First switching device is used for working power is offered described first receiver and described second receiver only one selectively; And

The second switch device is used for working power is offered described first reflector and described second reflector only one selectively.

7. dual-mode travelling carriage comprises:

First local oscillator (LO1) that is used for first frequency band (frequency band 1);

Second local oscillator (LO2) that is used for second frequency band (frequency band 2);

First receiver, its input and described at least one antenna are coupled, be used for amplifying RF signal with down-conversion first frequency band, make it to be converted to first intermediate frequency (IF1) of frequency band 1, first receiver switchably links to each other with the output of (LO1), so that output IF1 makes it to become the difference frequency between the frequency of frequency band 1 and the frequency (LO1);

Second receiver, its input and described at least one antenna are coupled, be used for amplifying RF signal with down-conversion second frequency band, make it to be converted to first intermediate frequency (IF2) of frequency band 2, second receiver switchably links to each other with the output of (LO2), so that output IF2 makes it to become the difference frequency between the frequency of frequency band 2 and the frequency (LO2);

First reflector, its output and described at least one antenna are coupled, and are used for the RF signal of up-conversion and amplification first frequency band, make it to be converted to the tranmitting frequency (f of frequency band 1_TX1), first reflector switchably links to each other with the output of (LO1), so that output (f_TX1), make it to be positioned at the center of the frequency of (LO1); And

Second reflector, its output and described at least one antenna are coupled, and are used for the RF signal of up-conversion and amplification second frequency band, make it to be converted to the tranmitting frequency (f of frequency band 2_TX2), second reflector switchably links to each other with the output of (LO2), so that output (f_TX2), make it to be positioned at the center of the frequency of (LO2); Wherein

Described first receiver and described second reflector place in first integrated circuit, and described second receiver and described first reflector place in second integrated circuit.

8. dual-mode travelling carriage as claimed in claim 7 further comprises:

9. dual-mode travelling carriage as claimed in claim 7 further comprises:

10. dual-mode travelling carriage comprises:

First receiver, its input and described at least one antenna are coupled, and are used for amplifying the RF signal of first frequency band, and first intermediate frequency (IF1) of output band 1;

Second receiver, its input and described at least one antenna are coupled, and are used for amplifying the RF signal of second frequency band, and first intermediate frequency (IF2) of output band 2;

First reflector, its output and described at least one antenna are coupled, and are used for amplification RF signal, and the tranmitting frequency (f of output band 1_TX1); And

Second reflector, its output and described at least one antenna are coupled, and are used for amplification RF signal, and the tranmitting frequency (f of output band 2_TX2); Wherein

At least a portion of described first receiver and described second reflector places in first integrated circuit, and at least a portion of described second receiver and described first reflector places in second integrated circuit.