A communication device for receiving communication signals in multiple frequency bands (options) and method for receiving signals from a variety of bands

 

The invention relates to communication devices. The technical result is to minimize signal loss. The method and apparatus allow the communication device to operate in multiple bands without the need to have a mixer (C) (234) for each band. For example, in the two-way radio telephone GSM/DCS 1800 frequency input of the local oscillator (LO) for both bands, GSM and DCS, served With (234) through the use of combining filters (f) (222, 246). Thus satisfied the requirements for duplex mode and approval at the input (234) and minimized signal loss. The outputs of the combining, summarizing f GSM and DCS duplex connected to the input (234). Provided coordination of the input impedance (234) for the received signals in each band. Provided by the agreement at the exit (234) for matching impedance IF f (260), providing a low impedance to the input RF frequency. Also described three-way radiotelephone. 3 S. and 4 C.p. f-crystals, 5 Il.

The technical field to which the invention relates the Present invention in General relates to communication devices and, in particular, to method of reception of communication signals and device for its implementation.

Description of the prior art tee network, providing service on a special frequency band, to provide communication services to its users had to provide a link to a special band. For example, network operators, providing communication in the GSM system (global (European) system for mobile communication) in the frequency band of 900 MHz, had to rely on the DCS (data transmission System) with a frequency band of 1800 MHz. Accordingly, communication devices such as cell phones, must be able to communicate at both frequencies, or even to rely on a third system, such as PCS 1900 (Personal Communication Services). The requirement to operate at two or more frequencies creates a number of problems. For example, if the receiver should include separate blocks for the reception of signals in each band, then increase the size and cost of devices.

Accordingly there is a need for a method and device for receiving communication signals on multiple bands with a minimum increase in the number of its elements.

A brief description of the drawings Fig.1 is a block diagram of a communication device according to the present invention.

Fig. 2 is a block diagram of the receiver 127 in Fig.1 according to the present invention.

Fig.3 - nativename variant implementation of the present invention.

Fig. 5 is a diagram of the mixer 234 according to the alternative implementation of the present invention.

Detailed description of the invention the Method and apparatus provide a communication device for operation in multiple frequency bands, such as 900 MHz GSM 1800 MHz DCS and 1900 MHz PCS, without the need to have the mixer for each band. In the two-way radio telephone GSM/DCS 1800, for example, the frequency of the input local oscillator (LO) for band GSM and DCS band are fed to the mixer through the use of combining filters. Thus satisfied the requirements for duplex mode and approval at the input of the mixer and minimized signal loss. In combining filters RX/LO, one for each of the bands (GSM and DCS), provided input ports RX and LO and common output port RX/LO. General output ports uniting filter RX/LO GSM and unifying filter RX/LO DCS duplex connected to the input of the mixer. Due to the fact that the requirements of the duplex between the frequencies of the input RX and LO are satisfied with combining filters, such circuit design reduces the number of duplex lines to the mixer from six to two to two-way communication devices and from ten to four for three-way communication devices. So the signals in each band, as well as providing RF (radio frequency) band-stop filter at the IF (intermediate) frequency. Finally, the output circuit of the mixer provides a low impedance at RF input frequency, as well as matching to the input of the IF filter.

Refer now to Fig.1, which shows a block diagram of the device of the radio communication, such as cellular phone, which includes the present invention. In a preferred embodiment, ASIC (specialized integrated circuit) HR generator 101, such as, for example, CMOS (CMOS) ASIC supplied by Motorola, Inc., and the microprocessor 103, such as a microprocessor NS, also supplied by Motorola, Inc., combined to generate the necessary communication Protocol for operating in a cellular system. The microprocessor 103 uses the memory 104 containing RAM (RAM) 105, EEPROM (electrically trireme programmable read-only memory), and ROM (ROM) 109, preferably mounted in the same housing 111, to perform the steps necessary to generate the Protocol and to perform other functions on the device radio communications, such as displaying information on the display 113, the receiving information from the keyboard 115, receiving information input/output through connector 116 according to the present invention, control of the frequency synthesizer 125 ilenia. ASIC 101 processes the audio signal transmitted by audioshell 119 from the microphone 117 and the speaker 121.

The transceiver processes the RF signals. In particular, the transmitter 123 transmits via the antenna 129 using carrier frequencies generated by the frequency synthesizer 125. Information received by the antenna of the communication device 129, arrives at the receiver 127, which demodulates the symbols using the carrier frequency from the frequency synthesizer 125. The communication device may not necessarily contain the message receiver and the storage device 130 that includes a means of digital signal processing. The message receiver and the storage device may represent, for example, a digital defendant or the receiver personal call (pager).

Refer now to Fig.2, which shows a block diagram of the receiver 127 for two-way radio telephone according to the present invention. The RF signal received by the antenna 129 is applied to the circuit 201 containing the first RF unit coordination 202 and the second RF unit coordination 204. RF circuit coordination is provided to ensure appropriate matching impedance on the receiver depending on the frequency of the received signal. Then RF si. The antenna control switch allows the passage of RF signals, subject to the receipt and transfer, using auxiliary equipment connected to the communication device through the connector 210. For example, through the connector 210 according to the present invention can be connected automatically to the console, allowing the vehicle to implement in automatic mode.

Then the received RF signal is provided on line 212 on many paths. That is, for each band provides a separate path in accordance with the number of bands available in the communication device. In particular, the line 212 is connected to the transmission line 214, which transmits the RF signal to the first filter 216. The filter 216 may represent, for example, three-pole ceramic bandpass filter used as a preselection filter. The ceramic filter can be, for example, configured to allow signals from 935 to 960 MHz in-band GSM reception. Then the signal from the filter is fed to the preamplifier 218. The preamplifier 218 preferably includes a bus 220 to enable or disable operation of the preamplifier. Preferably, the tire permissions managed through the transistor to prevent promo input 224 combining filter 222, and the frequency of the LO input to the second input 226 of the transmission line 230 connected to the generator regulated voltage 228. In the first tract, for example, the composite ceramic monoblock filter is capable of receiving signals with a frequency 935-965 MHz in the GSM band and 720-745 MHz input LO. General output port 232 of the filter 222 is connected to the mixer 234 through the transmission line 236.

Line 212 is connected to the second RF path using transmission line 240, which is connected to the second filter 242. The second filter may also be a three-pole bandpass ceramic filter used, for example, as a preselection filter. The output of the filter 242 is connected to the second preamplifier 244. It is preferable that the preamplifier 244 would have a bus resolution 246 to prevent the passage of the energy transmitter and other spurious frequencies in the mixer. The preamp output 244 is connected to the third input 248 on the second integrating filter 246. Combining filter 246 receives the LO frequency at the fourth input 250 via transmitting line 256. As will be described in more detail in connection with Fig.3, the mixer 234 generates a signal of intermediate frequency (IF) output 258. IF signal, preferably with a frequency of 215 MHz, is fed to the filter 260, de shows a diagram of the mixer 234 in Fig.2. The mixer is designed to work in the two-way radio telephone, such as telephone, ability to operate in the frequency band of 1800 MHz GSM, and in the frequency band 900 MHz DCS. The input circuit of the mixer is designed for matching (impedance) 50 Ohms on all bands and to filter the output IF signal 215 MHz. Similarly to optimize performance of the mixer is made with the circuit for the filter 215 MHz broadband scheme barrier strip LC filter for filtering the input RF signals (for each band). In particular, combining output signals of the filters are fed to the induction coil 302 mixer 234. The induction coil is connected to the capacitor 304 to ground and the base 310 of the transistor 308. The induction coil 302 and capacitor 304 together with the capacitor 306 and the induction coil 312 are selected in such a way as to provide RF coordination at the input of the mixer. That is, the values of their parameters are selected to provide impedance (impedance) 50 Ohm to accept each strip, for example, 900 MHz and 1800 MHz. Although within the scope of the present invention can use other values, it is preferable that the induction coil 302 would be in what would have capacitance of about 2 pF, and the induction coil 312 would have an inductance of the order of 5.6 NH.

The collector 314 of transistor 308 is connected to the transmission line 318, which is connected to ground through a capacitor 320. The collector is also connected to capacitor 322, which is connected to the induction coil 324, which is connected with the earth, and to the filter 260. And finally, the induction coil 326 is included between the collector 314 and resistor 332 connected to the induction coil 312. The capacitor 322 and the induction coil 326 is selected in such a way as to provide impedance matching for the IF filter 260. To optimize the functioning of the mixer settings of the strip line 318 and capacitor 320 are adjusted so as to achieve a scheme barrage LC filter for filtering the RF input signal. In particular, parameter values are chosen in order to provide a low impedance at the output to prevent the passage of RF signals in the filter 260 and provide input filter 260 net IF signal. For two-way radio telephone, the receiving RF signals with frequencies of 900 MHz and 1800 MHz, the strip line 318 preferably should have a width of about 20 mils (508 μm) and a length of about 350 mils (8990 μm), which provides an inductance of about 3 NH. Condens the inductance of the order of 27 NH.

Finally, the mixer is designed to provide an IF matching at the input of the filter 260. The induction coil 326 and capacitor 322 preferably be chosen in such a way as to provide a low impedance at the IF frequency of the mixer. For IF frequencies 215 MHz the capacitance of the capacitor is of the order of 33 pF, while the inductance of the induction coil 326 is about 27 NH. Similarly creates a barrier IF a filter to prevent passage of the intermediate frequency back to the transistor 308. In particular, the capacitor 334 connected between the induction coil 312 and the earth, creates a barrier filter for the IF signal. For IF frequencies 215 MHz inductance of the induction coil 312 is about 5.6 NH, and the capacitance of the capacitor 334 is about 68 pF.

In the three-band phone to receive signals from a third communication system may provide additional RF path. For example, the communication device can be adapted also to receive signals PCS 1900 MHz. In particular, in Fig. 4 line 212 can be connected to the third RF stage through transmission lines 451 and 414, which is connected to the filter 416. Filter 416, for example, may be a three-pole bandpass ceramic filter,s RF signals at frequencies 1930-1990 MHz band receive PCS 1900. Then the filtered signal is transmitted to the preamplifier 418. Preferably, the preamplifier 418 would include bus resolution 420 to allow or prevent the operation of the preamplifier. Preferably, the tire permissions managed through the transistor to prevent the passage of the energy transmitter and other spurious signals at the mixer. The preamp output 418 is connected to the fifth input on uniting the filter 422 and the input frequency LO is supplied to the sixth input 426 through transmission lines 430 and 452 connected to the generator regulated voltage 228. The combined output 432 filter 422 is connected to the mixer 234 through transmission lines 436 and 453. Although the present invention shows three steps, if necessary, you can use additional step in accordance with the number of available networks.

Please refer to Fig.5, which shows the mixer 234 in Fig.4. The mixer is designed to operate in the three-band phone at 900 MHz GSM 1800 MHz DCS 1800 MHz PCS. The input to the mixer is designed to harmonize with 50 Ohms on all three frequency bands and to filter the output IF signal 215 MHz. Similarly to optimize the functioning of the mixer output circuit smesi LC filter for filtering the input RF signals (for all three bands). The remaining parts of Fig. 4 and 5 is identical to Fig. 2 and 3, and therefore the functional content of these parts here will not recur.

Although the invention has been described and illustrated in the above description and drawings, it is understood that this description is provided only as an example and that the experts can offer there are many changes and modifications without going beyond being and scope of the invention. For example here described specific radiotelephone system having a specific receiver passband. However, this invention applies to other systems, such as EGSM. Although the present invention finds particular application in portable cellular radiotelephones, the invention can be used in any portable devices, including pagers, electronic organizers, or computers. This invention should be limited only by the following claims.

Claims

1. A communication device for receiving communication signals in many radio frequency (RF) bands containing the antenna circuit for receiving these communications signals in a specified set of RF bands in which the antenna circuit is connected to at least two paths for Priego many bands, first combining filter having a first input connected to the first path, for receiving communication signals in a first RF band, and a second input for receiving a fixed frequency generator, and combining the first filter has an output for generating an output signal that is connected to the mixer to generate a signal of intermediate frequency, a second path connected to the antenna circuit, for receiving communication signals in a second RF band specified multiple RF bands, the second combining filter having a first input connected to the second path, for receiving communication signals in a second RF band, and a second input for receiving a fixed frequency generator, and the second combining filter has an output for generating an output signal that is connected to the mixer to generate a signal of intermediate frequency, and a mixer connected to the outputs of the first and second combining filters.

2. The communication device under item 1, wherein the first path includes a first filter for transmission of communication signals when the communication signals are in the first RF band.

3. The communication device under item 2, wherein the first path includes a first amplifier, connected to receive the elk.

4. The communication device under item 1, wherein the second path includes a second filter for transmission of communication signals when the communication signals are in the second RF band.

5. The communication device under item 4, wherein the second path further contains a second amplifier for receiving the second enabling signal to unlock the second path when the communication signals are in the second RF band.

6. A communication device for receiving communication signals in multiple RF bands containing the antenna circuit for receiving communication signals in multiple RF bands in which the antenna circuit is connected to at least two paths for receiving RF bands, the first path connected to the antenna circuit containing a first amplifier for receiving communication signals in a first RF band, and the first amplifier connected to receive the first enabling signal to unlock the first path when the communication signals are in the first RF band, combining the first filter having a first input connected to the first path, for receiving communication signals in a first RF band, and a second input for receiving a fixed frequency generator, and combining the first filter has an output for generating an output signal, which poseiden is e, containing the second amplifier, for receiving communication signals in a second RF band, and a second amplifier connected for receiving the second enabling signal to unlock the second path when the communication signals are in the second RF band, the second combining filter having a first input connected to the second path, for receiving communication signals in a second RF band, and a second input for receiving a fixed frequency generator, and the second combining filter has an output for generating an output signal that is connected to the mixer to generate a signal of intermediate frequency, and a mixer connected to the outputs of the first and second combining filters.

7. Method for receiving communication signals from multiple RF RF bands, which sum up the communication signals in a first RF band to the first input of the first combining filter down a fixed frequency oscillator to the second input of the first combining filter, generate an output signal of the first combining filter down communication signals in a second RF band to the first input of the second combining filter down a fixed frequency oscillator to the second input of the second combining filter, generate vyhoda filters.

 

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