JP3055589B2 - Wireless telephone equipment - Google Patents

Abstract

PURPOSE:To provide a radio telephone equipment enabled to be used as a cordless telephone by wirelessly connecting it to a cordless telephone master set and used as a cellular telephone by wirelessly connecting it to a cellular telephone base station in a field. CONSTITUTION:A PLL circuit constituted of the 1st and 2nd frequency dividing means for dividing the frequency of an output signal from a reference signal oscillation means, a switching means for inputting outputs from respective frequency dividing means and selectively outputting either one of the inputs, a voltage control oscillator(VCO), a variable frequency dividing means for dividing the frequency of an outputs from the VCO, a phase comparing means for comparing the phase of an output signal from the switching means with that of an output signal from the variable frequency dividing means, and a loop filter for inputting the output of the phase comparing means and outputting the input as a control voltage signal for the VCO is used for a frequency synthesizer 34 and a switch is switched by a control means 44 to operate a cellular transmitting means 31 or a cordless transmitting means 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a wireless telephone device, and more particularly to a wireless telephone device which can be used as a cordless telephone near a home by wirelessly connecting to a home cordless telephone base unit.
The present invention relates to a wireless telephone device that can be used outdoors as a cellular telephone by wirelessly connecting to a cellular telephone base station.

[0002]

2. Description of the Related Art In recent years, a cellular telephone apparatus which can make a telephone call anytime, anywhere, and a cordless telephone using a radio instead of a cord between a telephone body and a handset have been used.

Conventionally, in a cordless telephone, a base unit is connected to a wired telephone line, and the base unit and the slave unit communicate with each other using radio waves. The user can use the cordless telephone handset to make and receive calls around the base station installed in the home (generally within a radius of several hundred meters). Since a call using a cordless telephone uses a subscriber's telephone line, the call charge is the same as a general wired telephone charge.

[0004] Cellular telephones use a cell as a region (Ce).
11), and a cellular telephone base station is arranged in each cell, and a user can use a cellular mobile device in any cell to surround the base station (generally, several to several tens). (within the range of km). Since this cellular telephone call is performed by a cellular base station and a cellular switching device, the telephone charge is much higher than that of a general wired telephone.

For this reason, a cellular cordless telephone has been developed which can perform both a cellular call and a cordless telephone, and always automatically operates as a cordless telephone when the telephone is within the communication range of the corresponding cordless telephone base unit. For example, it is described in JP-A-3-1621.

Hereinafter, this type of conventional cellular cordless telephone will be described with reference to the drawings. A conventional cellular cordless telephone 341 described in JP-A-3-1621 shown in FIG.
Speaker 343, microcomputer 344, display means 345, key input means 346, cordless antenna 3
51, cellular antenna 352, cordless receiver 36
1. Cordless transmitter 362, audio circuit 363, cellular receiver 371, cellular transmitter 372, audio circuit 37
3 and an audio switch 381 and the like. Alternatively, instead of the antennas 351 and 352 as indicated by broken lines, a low-pass filter 391 and a high-pass filter 392 are used.
May be used to connect to one shared antenna 353.

[0007] A conventional cellular system comprising the above components
The relationship between the components and the operation of the cordless telephone will be described below. First, the cellular cordless telephone 341 shown in FIG. 8 has a cordless receiver 361, a cordless transmitter 362, and an audio circuit 3 near the cordless telephone base unit under the control of the microcomputer 344.
63 is the operating state, the voice switch 381 selects the cordless side (A2, B2 side), and communicates with the cordless master. At this time, the cellular receiver 371 and the cellular transmitter 3
72, the audio circuit 373 enters a non-operation state. The operating frequency of the cordless telephone at this time is 46 (down) / 49 (up) MHz assigned to this band in the United States.

On the other hand, when the user moves away from the vicinity of the cordless telephone base station and goes out of the calling range of the base station, the microcomputer 344 controls the cellular receiver 371,
The cellular transmitter 372 and the audio circuit 373 are operating, and the audio switch 381 selects the cellular side (A1, B1 side) and communicates with the cellular base station. At this time, the cordless receiver 361, the cordless transmitter 362, the audio circuit 363
Becomes inactive. At this time, the frequency used by the cellular telephone is 82 in the U.S.
The frequency is 4 to 849 MHz, and the downstream is 869 to 894 MHz.

FIG. 9 shows the configuration of a transceiver when two antennas are used in the cellular cordless telephone configured as described above. 9, 351 is a cordless antenna, 352 is a cellular antenna, 361 is a cordless receiver, 362 is a cordless transmitter, 363 is a cordless audio circuit, 371 is a cellular receiver,
Numeral 72 denotes a cellular transmitter, and numeral 373 denotes an audio circuit for cellular, which is the same as that shown in FIG.

The cordless receiver 361 includes a band-pass filter 611 and a demodulator 612, and the cordless transmitter 362 includes a band-pass filter 621 and a modulator 6.
22. Band pass filters 611, 6
The antenna 21 and the antenna 351 are coupled by a coupling circuit 364, and the antenna 351 is shared by the cordless receiver 361 and the cordless transmitter 362.

[0011] The cellular receiver 371 includes a band-pass filter 711 and a demodulator 712, and the cellular transmitter 372 includes a band-pass filter 721 and a modulator 722. Band pass filter 71
1, 712 and the antenna 352 are coupled by a coupling circuit 374, and the antenna 352 is shared by the cellular receiver 371 and the cellular transmitter 372.

[0012]

However, the above-mentioned conventional cellular cordless telephone comprises a cellular transmitter / receiver and a cordless transmitter / receiver, and each transceiver has a band-pass filter. Therefore, the scale of the device has become large, and there has been a serious problem for a radio telephone device in which it is important to be small and portable.

The present invention solves the above-mentioned problems, and can be used as a cellular telephone when in a calling area of a cellular telephone base station connected to a wired telephone line. It is an object of the present invention to provide a small, lightweight, and inexpensive wireless telephone device that can be used as a cordless telephone when the user is in a call area.

[0014]

In order to achieve the above object, a radio telephone device according to the present invention comprises a first telephone having a different frequency band.
A radio signal apparatus for switching between a radio system and a second radio system for operation, comprising:
First and second frequency dividing means for dividing the output signal of the reference signal oscillating means, and one of the signals inputted from the output of the first frequency dividing means and the output of the second frequency dividing means , A voltage controlled oscillator, a variable frequency divider for dividing the output of the voltage controlled oscillator, and a comparison between the phase of the output signal of the switch and the phase of the output signal of the variable frequency divider. A PLL synthesizer comprising: a phase comparison unit; a loop filter that receives an output of the phase comparison unit and outputs the output as a control voltage signal of the voltage controlled oscillation unit;
Reception by the first wireless system provided in the stage preceding the
A single file that passes both signals of the second wireless system
Filter, reception by the first radio system, and second radio
And a single receiving unit that performs reception by the system .

According to the present invention, the control means directly switches the frequency dividing means for dividing the frequency at the first frequency dividing ratio or the second frequency dividing ratio without using the independent switching means. It was done.

[0016]

According to the present invention, by switching the output frequency of one frequency synthesizer according to the above-described configuration, communication can be performed by switching the wireless connection between the first wireless system and the second wireless system. A lightweight and inexpensive wireless telephone device can be realized.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a cellular cordless telephone according to an embodiment of the present invention, and FIG. 2 shows a system of the entire cellular cordless telephone. First, in FIG. 2, reference numeral 1 denotes a public telecommunications network (P
STN), 2 and 3 are exchanges, 4 is a cellular telephone base station,
Reference numeral 5 denotes a cellular cordless telephone, 6 denotes a cordless telephone base unit, 7 denotes a communication range of the cordless telephone base unit 6, and 8 denotes a communication range of the cellular telephone base station 6.

In FIG. 2, a cellular cordless telephone 5 communicates with a cordless telephone base station 6 in the vicinity of a cordless telephone base station 6 (communication range 7).
Is connected to a public telecommunications network (PSTN) 1.

On the other hand, the cellular cordless telephone 5 moves away from the vicinity of the cordless telephone
When deviating from, it communicates with the cellular telephone base station 4,
The call goes through the exchange 2 to the public telecommunications network (PSTN).
Connected to 1.

Next, the details of the cellular cordless telephone 5 will be described with reference to FIG. In FIG.
5 is a cellular cordless telephone, 10 is an antenna, 20
Is a triplexer, 30 is a transceiver, and 40 is a control circuit. The triplexer 20 includes a first band-pass filter 21 that passes only a cellular transmission frequency band, and a second band-pass filter 2 that passes only a cordless transmission frequency band.
2. Third band-pass filter 2 that passes only the cellular telephone reception frequency band and the cordless telephone reception frequency band
3. Antenna 10 and bandpass filters 21, 22, 2
3 is constituted by a coupling circuit 24 for coupling the first and second signals.
Also, the transceiver 30 includes a cellular transmission unit 31 for transmitting a signal in a cellular transmission frequency band, a cordless transmission unit 32 for transmitting a signal in a cordless transmission frequency band, and a cellular for receiving a signal in a cellular reception frequency band and a cordless reception frequency band. A cordless receiving means 33, a frequency synthesizer 34 composed of a PLL for switching and generating a signal of a cellular transmission frequency and a cordless transmission frequency, and a switch 35 for switching and connecting the frequency synthesizer 34 to the cellular transmitting means 31 or the cordless transmitting means 32; Be composed. Further, the control circuit 40 receives a signal from the microphone 42 and
Circuit 4 that outputs a signal to the speaker 43 and outputs a signal received by the cellular / cordless receiving means 33 to the speaker 43.
1. Display means 4 for displaying transmission / reception status and operation contents
5. Key input means 46 for inputting to the apparatus, and a microcomputer 44 for controlling the entire apparatus.

In this embodiment, the cellular transmission frequency is 824 to 849 MHz, and the cellular reception frequency is 8
69-894MHz, cordless transmission frequency is 926-
928 MHz, cordless reception frequency 902-904
MHz and the channel spacing is 30 kHz for both cellular and cordless phones.

The cellular cordless telephone 5 shown in FIG.
In the vicinity of the cordless telephone base unit, under the control of the microcomputer 44, the cellular / cordless receiving means 33 operates in the cordless receiving channels 902 to 904 MHz, and the cordless transmitting means 32 operates as 926 to 928.
It operates at MHz, and the audio circuit 41 selects the cordless side and communicates with the cordless parent device. At this time, the cellular transmission means 31 becomes inactive.

On the other hand, when the cellular phone is separated from the vicinity of the cordless telephone master unit and is out of the communication range of the master unit, the cellular cordless receiving means 33 operates under the cellular reception channel 869 to 894 MHz under the control of the microcomputer 44, and the cellular transmission is performed. Means 824 to 849 MH
At z, the operation state is set, and the audio circuit 41 selects the cellular side and communicates with the cellular telephone base station. At this time, the cordless transmission means 32 is in a non-operation state.

Next, a specific configuration of the frequency synthesizer 34 in one embodiment of the present invention will be described with reference to FIG. In FIG. 3, 34A is a frequency synthesizer, 10
1 is a reference frequency oscillator, 102 is a reference frequency oscillator 10
A first counter that divides the output of 1 (division ratio L);
Reference numeral 3 denotes a second counter for dividing the output of the reference frequency oscillator 101 (division ratio M). Reference numeral 104 denotes the input of the output of the first counter 102 and the output of the second counter 103, and a cellular / cordless mode. A switch 105 that is switched according to the switching signal; a phase comparator 105 that compares the phase of the output signal of the switch 104 with the output of the variable frequency divider 107;
Reference numeral 06 denotes a low-pass filter that passes only low-frequency components of the output of the phase comparator 105, reference numeral 108 denotes a voltage-controlled oscillator (VCO) whose oscillation frequency is controlled by the output voltage of the low-pass filter 106, and reference numeral 107 denotes a voltage-controlled oscillator 108.
Is a variable frequency divider that divides the output by the frequency division ratio based on the control data.

Next, the operation of the frequency synthesizer 34A will be described. The frequency synthesizer 34A outputs a frequency of 824 to 849 MHz in the cellular mode, has a channel interval of 30 kHz, outputs a frequency of 926 to 928 MHz in the cordless mode, and has a channel interval of 25 kHz. In this embodiment, the output of the reference frequency oscillator 101 is 19.2 MHz, and the frequency deviation is +/− 3 ppm.

When the frequency synthesizer 34A is in the cellular mode, the frequency division ratio L of the first counter 102 is L =
640, and the output is 30 kHz, which is input to the switch 104. In the cellular mode, the switch 104 outputs the output signal of the first counter 102, that is, 30k.
Hz is selected and input to the phase comparator 105. On the other hand, the variable frequency divider 107 is programmed by the microcomputer 44 with control data such that the output of the voltage-controlled oscillator 108 has a desired channel frequency. Connected to the other input of the detector 105. The phase comparator 105 is connected to the 30 kHz signal output from the first counter 102 and the variable frequency divider 10.
7, and compares the phase (or frequency) with the output signal of the voltage control oscillator 7, and passes the low-pass filter 106 to control the frequency of the voltage-controlled oscillator 108. In this way, the frequency synthesizer 34A enters the synchronous state, the output of the frequency synthesizer 34A, that is, the output of the voltage controlled oscillator 108 becomes N1 · 30 kHz, and outputs the channel frequency in the cellular mode.

Next, when the frequency synthesizer 34A is in the cordless mode, the dividing ratio M of the second counter 103 is M
= 768, and the output is 25 kHz, which is input to the switch 104. In the cordless mode, the switch 104 outputs the output signal of the second counter 103, that is, 25.
kHz is selected and input to the phase comparator 105. on the other hand,
The variable frequency divider 107 is programmed by the microcomputer 44 with control data such that the output of the voltage controlled oscillator 108 has a desired channel frequency, and the frequency division output (frequency division ratio N2) of the variable frequency divider 107 is calculated by the phase comparator 105. Connected to the other input of The phase comparator 105 is connected to the 25 kHz signal output from the second counter 103 and the variable frequency divider 1.
07, and compares the phase (or frequency) with the output signal of 07, and the comparison output signal passes through the low-pass filter 106 to control the frequency of the voltage-controlled oscillator 108. Thus, the frequency synthesizer 34A enters the synchronous state, the output of the frequency synthesizer 34A, that is, the output of the voltage controlled oscillator 108 becomes N2 · 25 kHz, and outputs the channel frequency in the cordless mode.

FIG. 4 shows another specific configuration of the frequency synthesizer 34 in one embodiment of the present invention. The same components as those shown in FIG. 3 are denoted by the same reference numerals. In FIG. 4, 34B is a frequency synthesizer, 101 is a reference frequency oscillator, 102 is a first counter, 103 is a second counter, 104 is a switch, 105 is a phase comparator, 107 is a variable frequency divider, 108
Denotes a voltage controlled oscillator (VCO), which is the same as that shown in FIG. 109 is cellular /
This is a band variable low-pass filter whose cutoff frequency is switched by a cordless mode switching signal.

Next, the operation of the frequency synthesizer 34B will be described. The frequency synthesizer 34B has a frequency of 824 to 824 in the cellular mode, as shown in FIG.
The frequency of 849 MHz is output and the channel interval is 3
0kHz, 926-928MHz in cordless mode
And the channel interval is 25 kHz. The output of the reference frequency oscillator 101 is also the same as in FIG.
At 2 MHz, the frequency deviation is +/- 3 ppm.

When the frequency synthesizer 34B is in the cellular mode, the frequency division ratio L of the first counter 102 is L =
640, and the output is 30 kHz, which is input to the switch 104. In the cellular mode, the switch 104 outputs the output signal of the first counter 102, that is, 30k.
Hz is selected and input to the phase comparator 105. On the other hand, the variable frequency divider 107 is programmed by the microcomputer 44 with control data such that the output of the voltage-controlled oscillator 108 has a desired channel frequency, and the frequency-divided output (frequency-dividing ratio N1) is a phase comparator. 105 is connected to the other input. The phase comparator 105 includes a 30 kHz signal output from the first counter 102 and the variable frequency divider 107.
, And compares the phase (or frequency) with the output signal, and the comparison output signal passes through the band variable low-pass filter 109 to control the frequency of the voltage controlled oscillator 108. Here, since the cellular / cordless switching signal is in the cellular mode, the cutoff frequency of the band variable low-pass filter 109 is the first frequency. Thus, the frequency synthesizer 34B enters the synchronization state, and , Ie, the output of the voltage controlled oscillator 108 is N1 ·
It becomes 30 kHz, and outputs the channel frequency in the cellular mode.

Next, when the frequency synthesizer 34B is in the cordless mode, the frequency division ratio M of the second counter 103 is M
= 768, and the output is 25 kHz, which is input to the switch 104. In the cordless mode, the switch 104 outputs the output signal of the second counter 103, that is, 2
5 kHz is selected and input to the phase comparator 105. On the other hand, the variable frequency divider 107 is programmed by the microcomputer 44 with control data such that the output of the voltage-controlled oscillator 108 has a desired channel frequency, and the frequency-divided output (frequency-dividing ratio N2) is determined by the phase comparator. 105 is connected to the other input. The phase comparator 105 compares the phase (or frequency) between the 25 kHz signal output from the second counter 103 and the output signal from the variable frequency divider 107,
The comparison output signal passes through the band variable low-pass filter 109 and controls the frequency of the voltage controlled oscillator 108. Here, since the cellular / cordless switching signal is in the cordless mode, the cutoff frequency of the band variable low-pass filter 109 is the second frequency, the frequency synthesizer 34B enters a synchronous state, and the frequency synthesizer 34
The output of B, that is, the output of the voltage controlled oscillator 108 is N2 · 25
kHz, and outputs the channel frequency in the cordless mode.

FIG. 5 shows a specific configuration example of the band variable low-pass filter 109 used in the frequency synthesizer 34B shown in FIG. In FIG. 5, 201, 202, 2
03 is a resistor having a resistance value of R1, R2, and R3, 204 is a capacitor having a capacitance of C, and 205 is a switch that is turned on and off by a cellular / cordless mode switching signal. The equivalent circuit of the band variable low-pass filter 109 is a lag-lead filter shown in FIG. Now, when the switch 205 in FIG. 5 is turned on, the resistance value r1 of the resistor 211 = R1 · R2 / (R
1 + R2), the resistance value r2 of the resistor 212 = R3, the capacitance value c of the capacitor 213 = C, and the cutoff frequency is f1
= 1 / 2π · c · r1 = (R1 + R2) / (2π · C ·
R1 · R2). Next, when the switch 205 in FIG. 5 is turned off, the resistance value r1 of the resistor 211 in the equivalent circuit in FIG.
R2, resistance value r2 of resistor 212 = R3, capacitor 21
3 has a capacitance value c = C, and its cutoff frequency is f2 = 1 /
2π · c · r1 = 1 / (2π · C · R2). Thus, the band variable low-pass filter 109 can switch between the two cutoff frequencies f1 and f2 (f1 <f2).

FIG. 7 shows still another specific configuration of the frequency synthesizer 34 in one embodiment of the present invention.
Components similar to those in FIG. 4 are denoted by similar reference numerals. In FIG. 7, 34C is a frequency synthesizer, 10C.
1 is a reference frequency oscillator, 102 is a first counter, 10
Reference numeral 3 denotes a second counter, 104 denotes a switch, 105 denotes a phase comparator, 107 denotes a variable frequency divider, and 109 denotes a variable band low-pass filter, which are the same as those shown in FIG. Reference numeral 110 denotes a band variable voltage controlled oscillator whose oscillation frequency is switched by a cellular / cordless mode switching signal.

Next, the operation of the frequency synthesizer 34C will be described. The frequency synthesizer 34C has 824 to 824 in the cellular mode, as shown in FIG.
The frequency of 849 MHz is output and the channel interval is 3
0kHz, 926-928MHz in cordless mode
And the channel interval is 25 kHz. The output of the reference frequency oscillator 101 is also the same as in FIG.
At 2 MHz, the frequency deviation is +/- 3 ppm.

When the frequency synthesizer 34C is in the cellular mode, the frequency division ratio L of the first counter 102 is L =
640, and the output is 30 kHz, which is input to the switch 104. The switch 104 outputs the output signal of the first counter 102 in the cellular mode, that is, 30 kHz.
z is selected and input to the phase comparator 105. On the other hand, the variable frequency divider 107 is programmed by the microcomputer 44 with control data such that the output of the band variable voltage controlled oscillator 110 becomes a desired channel frequency, and the frequency division output (frequency division ratio N1) is Connected to the other input of phase comparator 105. The phase comparator 105 compares the phase (or frequency) of the 30 kHz signal output from the first counter 102 with the output signal of the variable frequency divider 107, and outputs the comparison output signal as the band variable low-pass filter 109.
, The frequency of the band variable voltage controlled oscillator 110 is controlled. Since the cellular / cordless mode switching signal is in the cellular mode, the cutoff frequency of the band variable low-pass filter 109 is the first frequency, and the oscillation frequency band of the band variable voltage controlled oscillator 110 is 824 to 84.
8 MHz is selected. Thus, the frequency synthesizer 34C enters the synchronization state, and the frequency synthesizer 34C
The output of C, that is, the output of the voltage controlled oscillator 108 is N1 · 30
kHz, and outputs the channel frequency in the cellular mode.

Next, when the frequency synthesizer 34C is in the cordless mode, the frequency division ratio M of the second counter 103 is M
= 768, and the output is 25 kHz, which is input to the switch 104. The switch 104 outputs the output signal of the second counter 103 in the cordless mode, that is, 25.
kHz is selected and input to the phase comparator 105. on the other hand,
The variable frequency divider 107 is programmed by the microcomputer 44 with control data such that the output of the band variable voltage controlled oscillator 108 becomes a desired channel frequency, and the frequency division output (frequency division ratio N2) is determined by the phase comparator. 105 is connected to the other input. Phase comparator 105
Compares the phase (or frequency) between the 25 kHz signal output from the second counter 103 and the output signal from the variable frequency divider 107, and the comparison output signal passes through the band variable low-pass filter 109 and passes through the band variable voltage controlled oscillator. 110 frequency control is performed. Here, since the cellular / cordless mode switching signal is in the cordless mode, the cutoff frequency of the band variable low-pass filter 109 is the second frequency,
The oscillation frequency band of the band variable voltage controlled oscillator 110 is 9
26 to 928 MHz is selected. In this way, the frequency synthesizer 34C enters the synchronization state, and the output of the frequency synthesizer 34C, that is, the voltage controlled oscillator (VCO) 11
The output of 0 is N2 · 25 kHz, and outputs the channel frequency in the cordless mode.

As the band variable voltage controlled oscillator 110 for switching between two frequency bands used in the frequency synthesizer 34C shown in FIG. 7, the one shown in US Pat. No. 4,748,425, "VCO rangeshift and modulation device" may be used. good.

The frequency synthesizers 34A, 34A,
34B and 34C, the switch 104
Is switched between the first counter 102 and the second counter 103.
3 are configured as one counter capable of dividing at different first and second division ratios.
May be directly switched by the microcomputer 44.

[0039]

According to the present invention, one frequency synth
First wireless system and second wireless system by sizer
Can be switched, and the receiver is made a single unit.
Since the filter provided is also used, the size of the wireless telephone device can be reduced.
Can be done.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a wireless telephone device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a system configuration of a cellular telephone and a cordless telephone according to one embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a frequency synthesizer according to one embodiment of the present invention.

FIG. 4 is a block diagram showing another configuration of the frequency synthesizer in one embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a band variable low-pass filter according to one embodiment of the present invention.

FIG. 6 is a circuit diagram showing an equivalent circuit of a variable band low-pass filter according to one embodiment of the present invention.

FIG. 7 is a block diagram showing still another configuration of the frequency synthesizer in one embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a wireless telephone device in a conventional example.

FIG. 9 is a block diagram showing a configuration of a transceiver in a wireless telephone device in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Public telecommunication network (PSTN) 2 Switching station 3 Switching station 4 Cellular telephone base station 5 Cellular / cordless telephone 6 Cordless telephone base station 7 Cordless communication range 8 Cellular communication range 10 Antenna 20 Triplexer 30 Transceiver 40 Control circuit 21 First circuit 22 band-pass filter 22 second band-pass filter 23 third band-pass filter 24 coupling circuit 31 cellular transmission means 32 cordless transmission means 33 cellular / cordless reception means 34 frequency synthesizer (PLL) 35 switch 41 audio circuit 42 microphone 43 speaker 44 microcomputer 45 display means 46 key input means 101 reference frequency oscillator 102 first counter 103 second counter 104 switch 105 phase comparator 106 low-pass filter 107 possible Variable frequency divider 108 Voltage controlled oscillator (VCO) 109 Variable band low-pass filter 110 Variable band voltage controlled oscillator

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/38-1/58 H04B 7/26 H04M 1/00 H04Q 7/00-7/38

Claims (7)

(57) [Claims] 1. A wireless telephone device which operates by switching between a first wireless system and a second wireless system having different frequency bands, wherein a reference signal oscillating means and a frequency divider for dividing an output signal of the reference signal oscillating means are provided. First and second frequency dividing means, switching means for receiving an output of the first frequency dividing means and an output of the second frequency dividing means and selecting and outputting one of the signals, and voltage controlled oscillation Means, variable frequency dividing means for dividing the output of the voltage controlled oscillator, phase comparing means for comparing the phase of the output signal of the switching means with the output signal of the variable frequency dividing means, and the phase comparing means A PLL filter having a loop filter for inputting the output of the first and outputting it as a control voltage signal of the voltage controlled oscillating means.
In a wireless telephone device that switches to the second wireless system or the second wireless system and performs wireless communication, a first wireless system provided in a preceding stage of the receiving unit.
Signal of both the receiving and the second wireless system
With a single filter, the reception by the first radio system and the second radio system
And a single receiving unit for performing a receiving operation . 2. A radio telephone apparatus which operates by switching between a first radio system and a second radio system having different frequency bands, wherein a reference signal oscillating means and an output signal of the reference signal oscillating means are supplied to a first or a second radio system. Frequency dividing means for dividing by a frequency dividing ratio of 2, voltage controlled oscillating means, variable frequency dividing means for dividing the output of said voltage controlled oscillating means, output signal of said frequency dividing means and said variable frequency dividing A PLL synthesizer comprising: a phase comparison unit that compares a phase with an output signal of the unit; and a loop filter that receives an output of the phase comparison unit and outputs the output as a control voltage signal of the voltage controlled oscillation unit.
A radiotelephone apparatus for switching between the first frequency division ratio and the second frequency division ratio of the frequency division means to switch to the first radio system or the second radio system and perform radio communication.
Te, the first wireless system provided in front of the receiver
Signal of both the receiving and the second wireless system
With a single filter, the reception by the first radio system and the second radio system
And a single receiving unit for performing a receiving operation . 3. A radiotelephone apparatus which operates by switching between a first radio system and a second radio system having different frequency bands, wherein a reference signal oscillating means and a frequency divider divides an output signal of the reference signal oscillating means. First and second frequency dividing means, switching means for receiving an output of the first frequency dividing means and an output of the second frequency dividing means and selecting and outputting one of the signals, and voltage controlled oscillation Means, variable frequency dividing means for dividing the output of the voltage controlled oscillator, phase comparing means for comparing the phase of the output signal of the switching means with the output signal of the variable frequency dividing means, and the phase comparing means A PLL synthesizer having a loop filter capable of inputting an output of the voltage control oscillating means and outputting a control voltage signal of the voltage controlled oscillating means, and switching a pass band width by the control signal. Wireless electrodeposition of wireless communication is switched to the first wireless system or the second wireless system by switching the pass band width of the loop filter
A first wireless system provided in a stage preceding the receiving unit.
Signal of both the receiving and the second wireless system
With a single filter, the reception by the first radio system and the second radio system
And a single receiving unit for performing a receiving operation . 4. A radiotelephone apparatus which operates by switching between a first radio system and a second radio system having different frequency bands, wherein a reference signal oscillating means and an output signal of the reference signal oscillating means are supplied to a first or a second radio system. Frequency dividing means for dividing by a frequency dividing ratio of 2, voltage controlled oscillating means, variable frequency dividing means for dividing the output of said voltage controlled oscillating means, output signal of said frequency dividing means and said variable frequency dividing A phase comparing means for comparing the phase with an output signal of the means, a loop capable of inputting an output of the phase comparing means and outputting it as a control voltage signal of the voltage controlled oscillating means, and switching a pass bandwidth by the control signal A PLL synthesizer having a filter, and switching the frequency division ratio of the frequency dividing means and the pass bandwidth of the loop filter by switching the first radio system or the second radio system. Wireless phones that wireless communication is switched to the
In the device, a first wireless system provided in a stage preceding the receiving unit is provided.
Signal of both the receiving and the second wireless system
With a single filter, the reception by the first radio system and the second radio system
And a single receiving unit for performing a receiving operation . 5. A radiotelephone apparatus which operates by switching between a first radio system and a second radio system having different frequency bands, wherein a reference signal oscillating means and a frequency divider for dividing an output signal of the reference signal oscillating means are provided. First and second frequency dividing means, switching means for inputting an output of the first frequency dividing means and an output of the second frequency dividing means and selecting and outputting one of the signals; Voltage-controlled oscillation means for performing an oscillation operation by switching between an oscillation frequency band and a second oscillation frequency band; variable frequency-dividing means for dividing the output of the voltage-controlled oscillation means; Phase comparing means for comparing the phase with the output signal of the circulating means; input of the output of the phase comparing means to output as a control voltage signal of the voltage controlled oscillating means; P having a such loop filter
An LL synthesizer for switching between the switching means, the pass band width of the loop filter, and the oscillation frequency band of the voltage controlled oscillation means to switch to the first wireless system or the second wireless system for wireless communication. A wireless telephone device, comprising: a single filter provided at a stage preceding the receiving unit, for passing signals of both a first wireless system and a second wireless system; and receiving a signal by the first wireless system. And a single receiving unit for receiving by the second wireless system. 6. A radiotelephone apparatus which operates by switching between a first radio system and a second radio system having different frequency bands, wherein a reference signal oscillating means and an output signal of said reference signal oscillating means are supplied to the first or second radio system. Frequency dividing means for dividing the frequency by a dividing ratio of 2; voltage-controlled oscillating means for performing an oscillating operation by switching between a first oscillation frequency band and a second oscillation frequency band; Variable frequency dividing means, a phase comparing means for comparing phases of an output signal of the frequency dividing means and an output signal of the variable frequency dividing means, and an input of the output of the phase comparing means, the voltage controlled oscillating means Having a loop filter that outputs a control voltage signal of
A synthesizer for switching to the first wireless system or the second wireless system by switching a frequency division ratio of the frequency dividing means, a pass bandwidth of the loop filter, and an oscillation frequency band of the voltage controlled oscillation means. In a wireless telephone device for communication, a first wireless system provided in a stage preceding the receiving unit is used.
Signal of both the receiving and the second wireless system
With a single filter, the reception by the first radio system and the second radio system
And a single receiving unit for performing a receiving operation . 7. A first band-pass filter for passing only a cellular transmission frequency band, a second band-pass filter for passing only a cordless transmission frequency band, and passing only a cellular reception frequency band and a cordless reception frequency band. A third band-pass filter, a coupling circuit for coupling the antenna to each of the band-pass filters, a cellular transmission unit for transmitting a signal in a cellular transmission frequency band, and a cordless transmission unit for transmitting a signal in a cordless transmission frequency band. A cellular / cordless receiving means for receiving signals in a cellular reception frequency band and a cordless reception frequency band, a frequency synthesizer comprising a PLL for switching and generating a signal between a cellular transmission frequency and a cordless transmission frequency, the frequency synthesizer and the cellular transmission Means or cordless A switch for switching and connecting to the communication means, a signal from a microphone, an output of a signal to the frequency synthesizer, and an audio circuit for outputting a signal received by the cellular / cordless reception means to a speaker; Display means for displaying operation details, key input means for inputting to the device,
In a wireless telephone device including a microcomputer for controlling the entire device , a first wireless system provided at a stage preceding the receiving unit is provided.
Signal of both the receiving and the second wireless system
With a single filter, the reception by the first radio system and the second radio system
And a single receiving unit that performs
Wireless telephone device.