KR19990059008A - Mobile communication terminal with home wireless telephone function - Google Patents

Abstract

The present invention is to provide convenience to the mobile communication terminal to be used as a mobile phone or a wireless telephone by the user's selection in the outdoor, the present invention is a mobile communication signal or wireless through an antenna in a general mobile communication terminal First and second duplexers for transmitting / receiving telephone signals, a wireless telephone RF filter unit for filtering an RF signal output from the low noise amplifier unit, or an upmixer signal, and an IF signal of the downmixer; A wireless telephone IF filter unit for filtering the signal of the automatic gain control unit, a power conversion unit for converting the output power of the wireless telephone RF filter unit to be transmitted to the second duplexer, and a plurality of switches are further provided. Cheap aerials indoors by using both mobile and wireless telephones in one mobile terminal Wireless telephone calls can be made using regular wired and wireless telephones without separate wired or wireless telephones, and high quality devices used in mobile communication terminals are used as they are for wired and wireless telephones. You can do it.

Description

Mobile communication terminal with home wireless telephone function

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication terminal, and more particularly, to an apparatus for providing convenience by enabling a mobile phone or a wireless telephone to be selected by a user at a mobile communication terminal used outdoors.

In general, a mobile communication system is a system that enables communication while moving through a mobile communication terminal, and includes a personal communication system (PCS) system, a digital cellular system (DCS), and a digital frequency common communication system ( DTRS, Digital Trunked Radio System) is used.

1 is a block diagram of a conventional mobile communication terminal.

As shown therein, a duplexer 1 performing transmission / reception through an antenna; A low noise amplifier (LNA) 2 for lowering the noise figure of the radio wave received by the duplexer 1; An RF filter unit 3 for filtering an RF signal output from the low noise amplifier 2; A downmixer (4) for generating an IF (Intermediate Frequency) signal by mixing the signal filtered by the RF filter unit and the signal of the synthesizer; A synthizer 5 for generating a transmit / receive RF frequency and transmitting it to the downmixer 4 and the upmixer 43; An IF filter unit 6 for filtering the IF signal of the downmixer 4; An auto gain control unit (AGC) for automatically controlling gain such that the output of the IF filter unit 6 is kept constant; A baseband analog processor (BBA, BaseBand Analog) 8 for performing baseband analog processing on the mobile communication signal received by the automatic gain control unit 7 according to the output of the synthesizer 5; An automatic gain control unit (9) for automatically controlling gain so that the output of the baseband analog processor (8) is kept constant; An RF filter unit 10 for performing bandpass filtering of the signal output from the automatic gain control unit 9; An upmixer 11 for mixing the output of the RF filter unit 10 and the frequency of the synthesizer 5 to output a phase difference value; A power amplifier 12 for amplifying and outputting the power of the signal output from the upmixer 11; It is composed of an isolator 13 to prevent the transmission distortion of the reflected wave in the power of the power amplifier 12 to transmit to the duplexer 1 without attenuation in only one direction.

The operation of the conventional mobile communication terminal configured as described above will be described in detail with reference to the accompanying drawings.

First, when receiving a signal from the mobile communication terminal, the duplexer 1 receives the signal through the antenna and sends it to the low noise amplifier 2. The low noise amplifier 2 then lowers the noise figure in the signal of the duplexer 1, filters in the RF filter unit 3 and then downmixes the down mixer 4 with the signal of the synthesizer 5. do. Filtering and automatic gain control of the downmixed signal were performed and transmitted to the baseband analog processor 8.

When transmitting a signal from the mobile communication terminal, the gain is automatically controlled by the automatic gain control unit 9 so that the output of the baseband analog processor 8 is kept constant, and the bandpass filtering is performed by the RF filter unit 10. The mixing is performed together with the output of the synthesizer 5 in the upmixer 11 to output a phase difference value. Then, the power amplifier is transmitted to the duplexer 1 through power amplification and isolation, and the duplexer 1 operates to transmit the signal through the antenna.

However, the conventional mobile communication terminal uses the 800MHz band, the home wireless telephone uses the 900MHz band, the mobile communication terminal that can be used freely in the outdoors had a disadvantage that the fee is expensive compared to the wired and wireless telephone using the aerial.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, and an object of the present invention is to provide convenience by making it possible to use a mobile phone or a wireless telephone by a user's selection in a mobile communication terminal used outdoors. The present invention provides a mobile communication terminal to which a home wireless telephone function is added.

In order to achieve the above object, a mobile communication terminal to which a home wireless telephone function is added according to the present invention is provided.

First and second duplexers for transmitting / receiving a mobile communication signal or a radio telephone signal through an antenna; A low noise amplifier for lowering a noise figure of radio waves received by the first and second duplexers; A mobile communication / wireless telephone RF filter unit for filtering an RF signal output from the low noise amplifier unit or filtering an upmixer signal; A down mixer for generating an IF signal by mixing the signal filtered by the mobile communication / wireless RF filter unit and the signal of the synthesizer; A synthesizer which generates a transmit / receive RF frequency and transmits the downmixer and the upmixer; A mobile communication / wireless telephone IF filter unit for filtering the IF signal of the downmixer or filtering the signal of the automatic gain control unit; An automatic gain controller for automatically controlling gain such that the output of the mobile communication / wireless IF filter unit or baseband analog processor is kept constant; A baseband analog processor configured to perform baseband analog processing on the mobile communication signal received from the automatic gain control unit according to the output of the synthesizer; An upmixer for mixing the output of the mobile communication / wireless IF filter unit with the frequency of the synthesizer and outputting a phase difference value; A power amplifier for power amplifying the signal of the mobile communication RF filter; An isolator which prevents transmission distortion of the reflected wave at the power of the power amplifier and transmits it to the first duplexer without attenuation; A power converter converting the output power of the radiotelephone RF filter unit and transmitting the converted power to the second duplexer; The first and second duplexers, the mobile communication / wireless telephone RF filter unit and the mobile communication / wireless telephone IF filter unit for performing the switching from the first to the ninth switch is characterized in that the technical configuration.

1 is a block diagram of a conventional mobile communication terminal,

2 is a block diagram of a mobile communication terminal to which a home wireless telephone function is added according to the present invention;

<Description of the symbols for the main parts of the drawings>

22, 23: first and second duplexer 25: low noise amplifier

27, 45: mobile communication RF filter unit 28, 48: wireless telephone RF filter unit

30: Down mixer 31: Synthesizer

33, 40: mobile communication IF filter unit 34, 41: wireless telephone IF filter unit

36, 38: auto gain control 37: baseband analog processor

43: up mixer 46: power amplifier

47: isolator 49: power conversion unit

21, 24, 26, 29, 32, 35, 39, 42, 44: first to ninth switches

Hereinafter, an embodiment according to the technical idea of the mobile communication terminal to which the home wireless telephone function of the present invention configured as described above is described in detail.

2 is a block diagram of a mobile communication terminal to which a home wireless telephone function is added according to the present invention.

As shown therein, first and second duplexers 22 and 23 for transmitting / receiving a mobile communication signal or a radio telephone signal through an antenna; A low noise amplifier 25 for lowering the noise figure of the radio wave received by the first and second duplexers 22 and 23; A mobile communication / radiotelephone RF filter unit 27, 28, 45, 48 for filtering the RF signal output from the low noise amplifier 25 or the signal of the upmixer 43; A downmixer 30 for generating an IF signal by mixing the signal filtered by the mobile communication / wireless RF filter unit 27 and 28 and the signal of the synthesizer 31; A synthesizer 31 which generates a transmit / receive RF frequency and transmits it to the downmixer 30 and the upmixer 43; A mobile communication / wireless IF filter unit (33) (34) (40) (41) for filtering the IF signal of the downmixer (30) or for filtering the signal of the automatic gain control unit (38); An automatic gain control unit 37 for automatically controlling gain so that the output of the mobile communication / wireless IF filter unit 33, 34 or baseband analog processor 37 is kept constant; A baseband analog processor 37 for performing baseband analog processing on the mobile communication signal received by the auto gain control unit 36 according to the output of the synthesizer 31; An upmixer (43) for outputting a phase difference value by mixing the output of the mobile communication / wireless telephone IF filter unit (40) (41) and the frequency of the synthesizer (31); A power amplifier 46 for power amplifying the signal of the mobile communication RF filter unit 45; An isolator (47) which prevents transmission distortion of the reflected wave in the power of the power amplifier (46) and transmits it to the first duplexer (22) without attenuation; A power converter 49 for converting the output power of the radiotelephone RF filter unit 48 and transmitting the converted power to the second duplexer 23; The first and second duplexers 22, 23, and the mobile communication / wireless RF filter unit 27, 28, 45, 48 and the mobile communication / wireless IF filter unit 33, 34 And first to ninth switches 21, 24, 26, 29, 32, 35, 39, 42, and 44 that perform the switching at () (40) (41).

The operation of the mobile communication terminal to which the home wireless telephone function according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the mobile communication terminal uses the 800 MHz band, and the home wireless telephone uses the frequency of the 900 MHz band, but the difference between the two terminals is only a slight frequency band difference and an output level difference. The difference is that the mobile phone and the wireless phone can be made into one terminal by using the basic elements constituting the mobile communication terminal and adding only a few elements.

The difference in frequency band may be converted to the same IF band by using the synthesizer 31 in the mobile communication terminal as it is, and the RF filter 28 and the IF filter 34 that correspond to the band of the wireless telephone are used in the receiver of the RF terminal. ), An IF filter (41) and a power converter (49) are added to the transmitting end, and a terminal having a dual structure of a radiotelephone and a mobile communication terminal is converted to a mode as necessary, thereby combining the mobile communication terminal with the radiotelephone. You can easily configure.

Therefore, when the user wants to use the mobile communication terminal for mobile communication, the operation is as follows.

First, the first switch 21 allows an 800 MHz signal to be input to the first duplexer 22 according to a user's selection. Then, the second switch 24 transmits the mobile communication signal of the first duplexer 22 to the low noise amplifier 25 so that the low noise amplification is performed. In addition, the third switch 26 allows the low noise amplified signal from the low noise amplifier 25 to be input to the mobile communication RF filter 27 to perform filtering. Accordingly, the fourth switch 29 causes the signal of the mobile communication RF filter unit 27 to be input to the down mixer 30, and the down mixer 30 receives the signal and synthesizer filtered by the mobile communication RF filter unit 27. The signal of (31) is mixed to generate an IF signal. Thus, the fifth switch 32 inputs the signal of the downmixer 30 to the mobile communication IF filter unit 33 to perform filtering, and the sixth switch 36 of the mobile communication IF filter unit 33 The signal is input to the automatic gain control unit 36.

The received signal is transmitted after being processed by the baseband analog processor 37. That is, the seventh switch 39 transmits the transmission signal from the automatic gain control unit 38 to the mobile communication IF filter unit 40 to perform filtering, and the eighth switch 40 uses the mobile communication IF filter unit ( A path is set between 40 and the upmixer 43. Thus, the upmixer 43 outputs the phase difference value by mixing the output of the mobile communication IF filter unit 40 and the frequency of the synthesizer 31. Thus, the ninth switch 44 transmits the signal of the upmixer 43 to the mobile communication RF filter unit 45 so that filtering is performed. The filtered signal transmits the power amplifier 46 and the isolator 47 to each other. It was operated to be transmitted by the first duplexer 22 via.

On the other hand, when the user wants to use the mobile communication terminal for the wireless telephone by the user's selection is as follows.

First, the first switch 21 allows a 900 MHz signal to be input to the second duplexer 23 according to a user's selection. Then, the second switch 24 transmits the mobile communication signal of the second duplexer 23 to the low noise amplifier 25 so that the low noise amplification is performed. The third switch 26 causes the low noise amplified signal from the low noise amplifier 25 to be input to the radiotelephone RF filter 28 so that filtering is performed. Accordingly, the fourth switch 29 causes the signal of the radiotelephone RF filter unit 28 to be input to the down mixer 30, and the down mixer 30 receives the signal and the synthesizer filtered by the radiotelephone RF filter unit 28. The signal of (31) is mixed to generate an IF signal. Thus, the fifth switch 32 inputs the signal of the downmixer 30 to the radiotelephone IF filter unit 34 to perform filtering, and the sixth switch 36 of the radiotelephone IF filter unit 34. The signal is input to the automatic gain control unit 36.

The received signal is transmitted after being processed by the baseband analog processor 37. That is, the seventh switch 39 transmits the transmission signal from the automatic gain control unit 38 to the radiotelephone IF filter unit 41 to perform filtering, and the eighth switch 40 is a radiotelephone IF filter unit ( A path is set between 41 and the upmixer 43. Thus, the upmixer 43 outputs a phase difference value by mixing the output of the radiotelephone IF filter unit 41 and the frequency of the synthesizer 31. Thus, the ninth switch 44 transmits the signal of the upmixer 43 to the radiotelephone RF filter unit 48, converts the power from the power conversion unit 49, and then transmits the signal to the second duplexer 23. The two duplexers 23 operate to transmit a 900 MHz signal of a radio telephone received from the power converter 49 through an antenna.

As described above, the present invention enables the mobile communication terminal used outdoors to be used as a mobile phone or a wireless telephone by a user's selection.

As described above, the mobile communication terminal to which the home wireless telephone function according to the present invention is added is a single mobile communication terminal that is not restricted by a place and uses both methods of a mobile communication and a wireless telephone and thus has a low price indoors. Wireless telephone calls can be made by public air without using separate wired or wireless telephones. You can make high-quality telephone calls by using high-quality devices used in mobile communication terminals as they are. There is a guaranteeable effect.

Claims (1)

In the mobile communication terminal, First and second duplexers 22 and 23 for transmitting / receiving a mobile communication signal or a radiotelephone signal through an antenna; A low noise amplifier 25 for lowering the noise figure of the radio wave received by the first and second duplexers 22 and 23; A mobile communication / radiotelephone RF filter unit 27, 28, 45, 48 for filtering the RF signal output from the low noise amplifier 25 or the signal of the upmixer 43; A downmixer 30 for generating an IF signal by mixing the signal filtered by the mobile communication / wireless RF filter unit 27 and 28 and the signal of the synthesizer 31; A synthesizer 31 which generates a transmit / receive RF frequency and transmits it to the downmixer 30 and the upmixer 43; A mobile communication / wireless IF filter unit (33) (34) (40) (41) for filtering the IF signal of the downmixer (30) or for filtering the signal of the automatic gain control unit (38); An automatic gain control unit 37 for automatically controlling gain so that the output of the mobile communication / wireless IF filter unit 33, 34 or baseband analog processor 37 is kept constant; A baseband analog processor 37 for performing baseband analog processing on the mobile communication signal received by the auto gain control unit 36 according to the output of the synthesizer 31; An upmixer (43) for outputting a phase difference value by mixing the output of the mobile communication / wireless telephone IF filter unit (40) (41) and the frequency of the synthesizer (31); A power amplifier 46 for power amplifying the signal of the mobile communication RF filter unit 45; An isolator (47) which prevents transmission distortion of the reflected wave in the power of the power amplifier (46) and transmits it to the first duplexer (22) without attenuation; A power converter 49 for converting the output power of the radiotelephone RF filter unit 48 and transmitting the converted power to the second duplexer 23; The first and second duplexers 22, 23, and the mobile communication / wireless RF filter unit 27, 28, 45, 48 and the mobile communication / wireless IF filter unit 33, 34 And first to ninth switches 21, 24, 26, 29, 32, 35, 39, 42, and 44 which perform switching in the 40, 41. A mobile communication terminal with a home wireless telephone function.