JP3115050B2 - Mobile communication equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication device such as a cordless telephone or a car telephone for performing bidirectional communication using a plurality of frequency bands.

[0002]

2. Description of the Related Art In a conventional mobile communication device for performing bidirectional communication, for example, as described in Japanese Patent Application Laid-Open No. 61-220528, a voltage-controlled oscillator for transmission and reception, a phase locked loop (hereinafter, PLL). [Phase Locked Loop]) was used to reduce the size and cost of the circuit.

[0003]

However, in the above-mentioned mobile communication device, bidirectional communication can be performed only by using one frequency band. Therefore, in order to perform bidirectional communication using a plurality of frequency bands, a plurality of transmission / reception circuits are required, so that the number of components increases, the circuit scale increases,
There was a problem that it became large.

An object of the present invention is to solve the above-mentioned problems of the prior art, and at least the plurality of frequency bands are the lowest frequency band and approximately N of the lowest frequency band (N = 2, 4, 8, 16, 16).
…) A small mobile communication device capable of performing two-way communication using the plurality of frequency bands and having a small number of components when configured with a double frequency band. It is in.

[0005]

In order to achieve the above object, according to the present invention, at least the plurality of frequency bands include a lowest frequency band and an approximate N of the lowest frequency band (N = 2,4,4).
..) Times the frequency band, the voltage-controlled oscillator and the PLL circuit modulate the baseband signal into a high-frequency modulation signal of each of the plurality of frequency bands. In this case, the high frequency modulation signals of the respective frequency bands among the plurality of frequency bands are commonly used when demodulating them into baseband signals.

[0006]

The frequency of the oscillation signal output from the voltage controlled oscillator is changed according to the frequency band of the high frequency modulation signal, or M (M = 2, 4, 8, 16,
…) Frequency division or K (K = 2, 4, 8,
16,...), And is given to the modulator or demodulator. As a result, the voltage controlled oscillator and the PLL circuit can be shared when modulating the baseband signal to the high frequency modulation signal of each frequency band among the plurality of frequency bands, respectively. Can be shared when demodulating the high-frequency modulated signals of the respective frequency bands into baseband signals. Therefore, according to the present invention, it is possible to perform bidirectional communication using transmission / reception signals in a plurality of frequency bands, and it is possible to reduce the size and cost by reducing the number of components.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, 101 is a first transmitting / receiving antenna, 102 is a second transmitting / receiving antenna, 103 is a duplexer filter, 104 is a high-frequency amplifier, 105 is a first switching circuit, and 106 is a first switching circuit. Bandpass filter, 10
7 is a second band-pass filter, 108 is a first mixing circuit, 109 is a first 1/2 frequency dividing circuit, 110 is a first 1
/ 4 frequency dividing circuit, 111 is a second switching circuit, 112 is a first switching circuit.
, A voltage-controlled oscillator 113, a first PLL circuit, 114
Is the first isolator, 115 is the second isolator,
116 is a first high-frequency power amplifier, 117 is a second high-frequency power amplifier, 118 is a third band-pass filter,
119 is a fourth band-pass filter, 120 is a third switching circuit, 121 is a second mixing circuit, and 122 is a second half.
A frequency divider; 123, a second quarter frequency divider; 124, a fourth switching circuit; 125, a second voltage controlled oscillator;
Is a second PLL circuit, 127 is an intermediate frequency signal processing unit,
28 is a first baseband signal processing circuit, 129 is a switching signal generator, 130 is a second baseband signal processing circuit, 131 is a phase / amplitude correction data output unit, 132 is a speaker, etc., 133 is an operation unit, 134 Is a microphone or the like.

The operation of the mobile communication device for performing bidirectional communication using transmission / reception signals of a plurality of frequency bands shown in FIG. 1 will be described. In the present embodiment, a first high-frequency modulation signal in a first frequency band is transmitted and received via a first antenna 101, and is approximately twice as large as the first frequency band via a second antenna 102. A second high-frequency modulated signal in a second high-frequency band is transmitted and received. At this time, whether to transmit or receive the first or second high-frequency modulated signal is set by the operation unit 133. This setting information is supplied to the switching signal generator 129.
Through the first switching circuit 105 and the second switching circuit
Switching circuit 109, third switching circuit 120, fourth switching circuit 124, first PLL circuit 113, second PL
It is applied to the L circuit 126 and controls the above circuits.

The operation when transmitting and receiving the second high-frequency modulated signal via the second antenna 102 will be described. First, the operation at the time of reception will be described. Second antenna 10
The second high-frequency modulation signal such as a quadrature-modulated voice signal and data signal input from the second switching circuit 105 is amplified by the high-frequency amplifier 104 via the duplexer filter 103 and is switched from the second switching circuit 105 by the switching signal. After the signal band is selected by the second band-pass filter 107, the signal band is input to the first mixing circuit 108.

On the other hand, from the first voltage controlled oscillator 112 controlled by the first PLL circuit 113, the frequency of the second high-frequency modulated signal is twice the frequency to be frequency-converted into the first intermediate frequency signal. An oscillation signal having a frequency is output, and the switching signal is output through the second switching circuit 111 according to the switching signal.
The signal is input to the first 分 frequency dividing circuit 109, where the two signals are different in phase by π / 2, and then input to the first mixing circuit 108.

As a result, two signals orthogonal to each other in the first intermediate frequency signal band are output from the first mixing circuit 108 and demodulated by the first baseband signal processing circuit 128 of the intermediate frequency signal processing section 127. After being done, speaker 1
The signal is output as an audio signal, a data signal, etc.

Next, the operation at the time of transmission will be described. A voice signal, a data signal, and the like input through a microphone or the like 134 are output to the second baseband signal processing circuit 13.
Due to 0, it is input to the second mixing circuit 121 as two orthogonal signals of the second intermediate frequency signal band.

On the other hand, from the second voltage controlled oscillator 125 controlled by the second PLL circuit 126, the frequency of the second intermediate frequency signal is twice as high as the frequency to be converted into the second high frequency modulated signal. An oscillation signal having a frequency is output, and the switching signal is output through the fourth switching circuit 124 according to the switching signal.
The signal is input to the second 分 frequency divider circuit 122, where the two signals differ in phase by π / 2, and then input to the second mixing circuit 121.

In the second mixing circuit 121, focusing only on the frequency relationship, the following signal processing is performed. That is, the second baseband signal processing circuit 130
, Two signals of sinφt and cosφt are input to the second half-frequency divider 122
Receives two signals, sinωt and cosωt, and outputs
Cos (ω-φ) t of two signals sinωt × sinφt → cos (ω−φ) t− cos (ω + φ) t cosωt × cosφt → cos (ω−φ) t + cos (ω + φ) t One of the composite signals sin (ω + φ) t of the two signals sinωt × cosφt → sin (ω + φ) t + sin (ω−φ) t cosωt × sinφt → sin (ω + φ) t−sin (ω−φ) t Is output.

That is, when the sum frequency component of the input signal is output as the second high-frequency modulation signal from the second mixing circuit 121, the unnecessary wave which is the difference frequency component of the input signal is canceled. When the difference frequency component of the input signal is output as the second high-frequency modulation signal,
Unwanted waves, which are the sum frequency components of the input signal, are canceled.

However, the unnecessary wave signals synthesized as described above are canceled out and attenuated because the unnecessary baseband signal input from the second baseband signal processing circuit 130 and the second 分 frequency dividing circuit 122 are respectively used. The amplitudes of the two signals are equal, and
This is when the phase difference is exactly π / 2. Therefore, the amplitudes of the two signals are equal and the phase difference is exactly π
The phase / amplitude correction data is input from the phase / amplitude correction data output unit 131 to the second mixing circuit 121 so that the amount of attenuation of the unnecessary wave signal is increased.

The second output from the second mixing circuit 121
After the signal band is selected from the third switching circuit 120 by the fourth band-pass filter 119 by the switching signal, the second high-frequency power amplifier 117 and the second high-frequency power amplifier 117
Isolator 115 and duplexer filter 103
Is output from the second antenna 102 via

Next, the first antenna 101
The operation at the time of transmitting and receiving the high frequency modulation signal will be described. First, the operation at the time of reception will be described. A first high-frequency modulated signal such as a quadrature-modulated voice signal and a data signal input from the first antenna 101 is amplified by a high-frequency amplifier 104 via a duplexer filter 103, and switched to a second high-frequency amplifier by a switching signal. After a signal band is selected by the first band-pass filter 106 from the switching circuit 105, the signal band is input to the first mixing circuit 108.

On the other hand, from the first voltage controlled oscillator 112 controlled by the first PLL circuit 113, the frequency of the second high-frequency modulated signal is twice the frequency to be frequency-converted to the first intermediate frequency signal. An oscillation signal having a frequency, that is, an oscillation signal having a frequency four times as high as the frequency at which the frequency of the first high-frequency modulation signal is to be frequency-converted into a first intermediate frequency signal, is output. 11
1 through a first ４ frequency divider 110,
Then, after two signals having phases different by π / 2 are input to the first mixing circuit 108.

As a result, two signals orthogonal to each other in the first intermediate frequency signal band are output from the first mixing circuit 108 and demodulated by the first baseband signal processing circuit 128 of the intermediate frequency signal processing section 127. After being done, speaker 1
The signal is output as an audio signal, a data signal, etc.

Next, the operation at the time of transmission will be described. A voice signal, a data signal, and the like input through a microphone or the like 134 are output to the second baseband signal processing circuit 13.
Due to 0, it is input to the second mixing circuit 121 as two orthogonal signals of the second intermediate frequency signal band.

On the other hand, from the second voltage controlled oscillator 125 controlled by the second PLL circuit 126, the frequency of the second intermediate frequency signal is twice the frequency to be frequency-converted into the second high frequency modulation signal. An oscillation signal having a frequency, that is, an oscillation signal having a frequency four times as high as the frequency at which the frequency of the second intermediate frequency signal is to be frequency-converted into the first high-frequency modulation signal is output. 12
4, the signal is input to the second quarter frequency dividing circuit 123,
Thus, after two signals having phases different by π / 2 are input to the second mixing circuit 121. Also in this case, the second mixing circuit 121 performs the above-described signal processing when focusing only on the frequency relationship.

The second baseband signal processing circuit 1
30 and the phase and amplitude correction data so that the two signals input from the second quarter frequency divider 123 have the same amplitude and a phase difference of exactly π / 2. From the output unit 131 to the second mixing circuit 1
21 to increase the amount of attenuation of the unnecessary wave signal.

The second output from the second mixing circuit 121
After the signal band is selected by the third band-pass filter 118 from the third switching circuit 120 according to the switching signal, the first high-frequency power amplifier 116 and the first high-frequency power amplifier 116
Isolator 114 and duplexer filter 103
Is output from the first antenna 101 via the.

As described above, according to the present embodiment, bidirectional communication using the first frequency band and the second frequency band which is approximately twice the frequency band can be performed. In this case, a first voltage-controlled oscillator 112 and a first PLL circuit 113 for performing signal processing in each frequency band
And the second voltage controlled oscillator 125 and the second PLL circuit 126 can be shared and used without changing the oscillation signal frequency band of the first voltage controlled oscillator 112 and the second voltage controlled oscillator 125. Low score,
A smaller mobile communication device is obtained.

Also, the high-frequency amplifier 104, the first mixing circuit 108, the first 分 frequency divider 109, the first ４
Frequency dividing circuit 110, first voltage controlled oscillator 112, first high frequency power amplifier 116, second high frequency power amplifier 117, second mixing circuit 121, second 1/2 frequency dividing circuit 122, secondを (gallium arsenide) FET
By using (field-effect transistors), a mobile communication device which is easy to be integrated and has excellent high-frequency characteristics can be obtained.

Further, the first mixing circuit 108 and the second mixing circuit 108
By using a GaAs FET double balance configuration for the mixing circuit 121, a circuit having good isolation characteristics between input signals can be provided.

In the above description, the two-way communication is performed using the first frequency band and the second frequency band approximately twice as large as the first frequency band. Is approximately N (N = 4, 8, 16, 32,...) Times the frequency band of the first を frequency divider 110 and the second ４ frequency divider, (N = 4, 8, 16, 32,...) It is apparent that the same effect as described above can be obtained by replacing the frequency dividing circuit.

FIG. 2 is a block diagram showing a second embodiment of the present invention. 1, reference numeral 201 denotes a first π / 2 phase shifter; 202, a second π / 2 phase shifter;
1 that perform the same operations as those described in FIG. 1 are assigned the same reference numerals as those in FIG. 1 and their description is omitted.

Referring to FIG. 2, the operation in the case of performing bidirectional communication using the first frequency band and the second frequency band which is approximately twice the frequency band will be described. At the time of reception,
The first voltage-controlled oscillator 112 controlled by the first PLL circuit 113 outputs an oscillation signal having a frequency to be converted from the frequency of the second high-frequency modulation signal to the first intermediate frequency signal. 2 when receiving the high-frequency modulated signal, the switching signal
The signal is input to the first π / 2 phase shifter 201, where the two signals differ in phase by π / 2, and then input to the first mixing circuit 108.

At the time of receiving the first high-frequency modulated signal,
In response to the switching signal, the first
１ ／ frequency dividing circuit 109, where the phase is π
After becoming two signals different by / 2, they are input to the first mixing circuit 108.

On the other hand, at the time of transmission, the second voltage controlled oscillator 125 controlled by the second PLL circuit 126
Outputs an oscillation signal having a frequency for which the frequency of the second intermediate frequency signal is to be frequency-converted into a second high-frequency modulation signal. When the second high-frequency modulation signal is transmitted, the fourth switching circuit 124 , And is input to a second π / 2 phase shifter 202, where two signals having phases different by π / 2 are input to a second mixing circuit 121.

When transmitting the first high-frequency modulated signal,
In response to the switching signal via the fourth switching circuit 124, the second
Is input to the 分 frequency divider circuit 122, where the phase is π
After becoming two signals that differ by / 2, they are input to the second mixing circuit 121.

According to this embodiment, in addition to the same effects as in FIG. 1, the oscillation signal frequency band from the first voltage-controlled oscillator 112 and the second voltage-controlled oscillator 125 and the first 1 /
1 can be used as the operating frequency band of the ２ frequency dividing circuit 109 and the second 分 frequency dividing circuit 122, so that the oscillation characteristics and the frequency dividing operation characteristics can be further improved. A good mobile communication device can be obtained.

In the above description, the two-way communication is performed using the first frequency band and the second frequency band approximately twice as large as the first frequency band. Is approximately N (N = 4, 8, 16, 32,...) Times the frequency band of the first half frequency dividing circuit 109 and the second 1/2 frequency dividing circuit 122. It is apparent that the same effect as described above can be obtained by replacing the 2N (N = 2, 4, 8, 16,...) Frequency dividing circuit.

FIG. 3 is a block diagram showing a third embodiment of the present invention. In the figure, reference numeral 301 denotes a first doubler, 302 denotes a first quadrupler, 303 denotes a second quadrupler, 304 denotes a second quadrupler, and others as shown in FIG. Those performing the same operations as those described above are given the same numbers as those in FIG. 1, and the description thereof is omitted.

Referring to FIG. 3, a description will be given of the operation when bidirectional communication is performed using the first frequency band and the second frequency band which is approximately twice the frequency band. At the time of reception,
The first voltage-controlled oscillator 112 controlled by the first PLL circuit 113 outputs an oscillation signal having a frequency for converting the frequency of the first high-frequency modulation signal into a first intermediate frequency signal. At the time of receiving the high-frequency modulation signal of 2, the switching signal is input to the first doubler 301 via the second switching circuit 111 and doubled. Then, it is input to the first １ ／ frequency dividing circuit 109, where
After being converted into two signals having phases different by π / 2, the signals are input to the first mixing circuit 108.

When the first high-frequency modulated signal is received,
The switching signal is input to the first quadruple multiplier 302 via the second switching circuit 111 and multiplied by four. And
The signal is input to the first 分 frequency dividing circuit 109, where the two signals are different in phase by π / 2, and then input to the first mixing circuit 108.

On the other hand, at the time of transmission, the second voltage controlled oscillator 125 controlled by the second PLL circuit 126
Outputs an oscillation signal having a frequency at which the frequency of the second intermediate frequency signal is to be frequency-converted into the first high-frequency modulation signal. When the second high-frequency modulation signal is transmitted, the fourth switching circuit 124 Through the second doubler 30
3 and is multiplied by 2. And the second half
The signal is input to the frequency dividing circuit 122, where the two signals differ in phase by π / 2, and then input to the second mixing circuit 121.

When transmitting the first high-frequency modulated signal,
In response to the switching signal, the signal is input to the second quadrupler 304 via the fourth switching circuit 124 and is quadrupled. And
The signal is input to the second 分 frequency divider circuit 122, where the two signals differ in phase by π / 2, and then input to the second mixing circuit 121.

According to this embodiment, in addition to the same effects as in FIG. 1, the oscillation signal frequency band from the first voltage controlled oscillator 112 and the second voltage controlled oscillator 125 is set to 1 / 2 frequency band can be used, so that the oscillation characteristics are better,
Since only the ２ frequency divider circuit is used, a mobile communication device with a small circuit scale can be obtained.

In the above description, the two-way communication using the first frequency band and the second frequency band which is approximately twice the frequency band is performed. Is approximately N (N = 4, 8, 16, 32,...) Times the frequency band of the first frequency multiplier 302 and the second frequency multiplier 304
It is apparent that the same effect as described above can be obtained by substituting N for N (N = 8, 16, 32, 64,...).

FIG. 4 is a block diagram showing a fourth embodiment of the present invention. In the figure, the same operations as those shown in FIG. 3 are denoted by the same reference numerals as those in FIG. 3, and the description thereof will be omitted.

Referring to FIG. 4, a description will be given of the operation when bidirectional communication is performed using the first frequency band and the second frequency band which is approximately twice the frequency band. At the time of reception,
From the first voltage-controlled oscillator 112 controlled by the first PLL circuit 113, when receiving the second high-frequency modulation signal, the frequency at which the frequency of the second high-frequency modulation signal should be converted to the first intermediate frequency signal When the first high-frequency modulation signal is received, an oscillation signal having a frequency for converting the frequency of the first high-frequency modulation signal into a first intermediate frequency signal is output. The oscillating signal is input to a first doubler 301 and doubled, and then input to a first 分 frequency dividing circuit 109, where two phases having phases different by π / 2 are used. The signal is then input to the first mixing circuit 108.

On the other hand, at the time of transmission, the second voltage controlled oscillator 125 controlled by the second PLL circuit 126
When the second high-frequency modulation signal is transmitted, an oscillation signal having a frequency at which the frequency of the second intermediate frequency signal is to be converted into the second high-frequency modulation signal is output. When the first high-frequency modulation signal is transmitted, An oscillation signal having a frequency at which the frequency of the second intermediate frequency signal is to be converted into a first high frequency modulation signal is output. The oscillating signal is input to a second frequency doubler 302, and after being multiplied by two, is input to a second 分 frequency divider 122, where the phase is π / π.
The two signals differ by two, and then input to the second mixing circuit 121.

According to the present embodiment, in addition to the same effects as in FIG. 3, the frequency band of the oscillation signal from the first voltage-controlled oscillator 112 is such that the received first or second high-frequency modulated signal is , And the frequency band of the oscillation signal from the second voltage-controlled oscillator 125 is modulated into a first or second high-frequency modulation signal for transmitting the second intermediate frequency signal. Oscillation frequency bands of the first voltage-controlled oscillator 112 and the second voltage-controlled oscillator 125;
Band pass filter 106, second band pass filter 1
In the case where the tracking characteristics of 07 and the pass band of the third band pass filter 118 and the pass band of the fourth band pass filter 119 are ensured, an easy-to-use mobile communication device can be obtained.

In the above description, the two-way communication using the first frequency band and the second frequency band approximately twice as large as the first frequency band is performed. It is apparent that the same effect as described above can be obtained when the frequency band is approximately N times (N = 4, 8, 16, 32,...).

FIG. 5 is a block diagram showing a fifth embodiment of the present invention. In the figure, reference numeral 501 denotes a fifth switching circuit, and those which perform the same operations as those shown in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.

Referring to FIG. 5, the operation in the case of performing bidirectional communication using the first frequency band and the second frequency band which is approximately twice the frequency band will be described. At the time of reception,
From the first voltage controlled oscillator 112 controlled by the first PLL circuit 113, the frequency of the second high-frequency modulated signal is converted to the first intermediate frequency signal by the frequency of 2
An oscillation signal having a frequency twice that of the second switching circuit 11 is output by the switching signal via the fifth switching circuit 501.
1 is input.

On the other hand, at the time of transmission, the first voltage controlled oscillator 112 controlled by the first PLL circuit 113
Outputs an oscillation signal having a frequency twice as high as the frequency at which the frequency of the second intermediate frequency signal is to be frequency-converted into a second high-frequency modulation signal. The signal is input to the fourth switching circuit 124.

According to this embodiment, in addition to the same effects as in FIG. 1, the first voltage-controlled oscillator 112 and the first PLL
Since the circuit 113 can be shared during transmission and reception, a small-sized mobile communication device with a smaller number of components can be obtained.

In the embodiments shown in FIGS. 2 to 4,
As in the present embodiment, the fifth switching circuit 501 is provided, and the first voltage-controlled oscillator 112 and the first PLL circuit 11 are provided.
It is obvious that the same effect as described above can be obtained by sharing 3 during transmission and reception.

FIG. 6 is a block diagram showing a sixth embodiment of the present invention. In the figure, 601 is a third PLL circuit, 602 is a third voltage controlled oscillator, and 603 is a third π
/ 2 phase shifter, 604 is a third mixing circuit,
Those performing the same operations as those described in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof will be omitted.

In FIG. 6, the received first or second high-frequency modulated signal is frequency-converted by a second mixing circuit 108 into a baseband modulated signal of an intermediate frequency band, and is input to a third mixing circuit 604. . On the other hand, the third PLL circuit 6
An oscillation signal is output from the third voltage-controlled oscillator 602 controlled by the third π / 2 phase shifter 60.
3, where the two signals differ in phase by π / 2, and then input to the third mixing circuit 604.
Thus, the baseband modulation signal is demodulated by the oscillation signal using one frequency band output from the third voltage controlled oscillator 602.

According to the present embodiment, in addition to the same effects as in FIG. 1, when demodulating the received first or second high-frequency modulated signal, one frequency output from the third voltage-controlled oscillator 602 is output. Since only the band oscillation signal is shifted by π / 2,
An oscillation signal with a small phase error can be obtained in the demodulation signal processing, and a higher-performance mobile communication device can be obtained.

In the embodiments shown in FIGS. 2 to 5,
As in the present embodiment, the third PLL circuit 601, the third voltage controlled oscillator 602, the third π / 2 phase shifter 603, the third
It is clear that the same effect as described above can be obtained by performing the demodulation signal processing using the mixing circuit 604.

[0058]

According to the present invention, at least the plurality of frequency bands are the lowest frequency band and the approximate frequency N (N
= 2, 4, 8, 16,...) Times, a plurality of frequency bands are used by sharing the voltage controlled oscillator and the PLL circuit used for modulation and demodulation in each frequency band. It is possible to perform two-way communication and obtain a smaller mobile communication device with a small number of parts.

Further, high-frequency circuit sections such as a high-frequency amplifier, a mixing circuit, a frequency dividing circuit, a voltage-controlled oscillator and a multiplier are provided.
By using GaAs FETs, a mobile communication device which is easy to be integrated and has excellent high frequency characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a block diagram showing a third embodiment of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a sixth embodiment of the present invention.

[Explanation of symbols]

101: first transmitting / receiving antenna, 102: second transmitting / receiving antenna, 103: duplexer filter, 104:
High frequency amplifier, 105: first switching circuit, 106: first
107: a second band-pass filter, 108: a first mixing circuit, 109: a first 分 frequency divider, 110: a first 回路 frequency divider, 111: a second
Switching circuit, 112... First voltage controlled oscillator, 113.
First PLL circuit, 114... First isolator, 11
5 second isolator, 116 first high frequency power amplifier, 117 second high frequency power amplifier, 118
Third band-pass filter, 119: fourth band-pass filter, 120: third switching circuit, 121: second mixing circuit, 122: second 1/2 frequency dividing circuit, 123: second 1
/ 4 frequency dividing circuit, 124: fourth switching circuit, 125: second
, The voltage-controlled oscillator 126, the second PLL circuit, 127
... intermediate frequency signal processing unit, 128 ... first baseband signal processing circuit, 129 ... switching signal generator, 130 ... second baseband signal processing circuit, 131 ... phase / amplitude correction data output unit, 132 ... speaker, etc. 133 ... operation unit,
134: microphone and the like.

Continuation of front page (56) References JP-A-49-131717 (JP, A) JP-A-61-253938 (JP, A) JP-A-54-133021 (JP, A) JP-A-1-69131 (JP) JP-A-58-40936 (JP, A) JP-A-3-89721 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 1/02-1/04 H04B 1/38-1/40 H04B 7/24-7/26 H04J 1/00-1/20 H04L 5/00-5/12 H04Q 7/06-7/38

Claims (2)

(57) [Claims] At the time of transmission, a baseband signal such as a voice signal or a data signal is transmitted using a first oscillating signal to transmit data in a plurality of frequency bands in order to perform bidirectional communication using a plurality of frequency bands. Modulated into a high-frequency modulation signal of a desired frequency band in, transmit the obtained high-frequency modulation signal, at the time of reception, receive a high-frequency modulation signal of a desired frequency band among the plurality of frequency bands, The obtained high frequency modulation signal is
In a mobile communication device that demodulates to a baseband signal such as a voice signal or a data signal using a second oscillation signal, at least the plurality of frequency bands are a minimum frequency band and approximately N of the minimum frequency band ( where N = 2,4,8,16,
If ...) composed of the multiple of the frequency bands, if provided with a first and a second voltage controlled oscillator to modulate each said baseband signal to high frequency modulated signals in the frequency band of each of the plurality of frequency bands In the above, the first voltage controlled oscillator is shared, and an oscillation signal output from the first voltage controlled oscillator is used as the first oscillation signal.
And / or when demodulating high-frequency modulated signals in each of the plurality of frequency bands into the baseband signal, the second voltage-controlled oscillator is shared and the second voltage-controlled oscillator is shared. using an oscillation signal outputted from the controlled oscillator as said second oscillation signal, said first and second voltage controlled oscillators, respectively, before
At least two of the highest frequency bands in the plurality of frequency bands
Outputs an oscillation signal in the same frequency band as the doubled frequency band.
Then, the baseband signal is
Approximately 1 / M of high frequency band (where M = 1, 2, 4, 8, 1
6, ...) quadrature-modulates into a high-frequency modulated signal of twice the frequency band
At this time, the oscillation signal from the first voltage controlled oscillator is set to 2M
First frequency dividing means for frequency division to obtain two orthogonal signals
And the two orthogonal signals obtained by the first frequency dividing means.
Is used as the first oscillation signal, and the baseband
Quadrature modulator for quadrature-modulating a signal into the high-frequency modulated signal
And an outline 1 of the highest frequency band in the plurality of frequency bands.
/ M times the high frequency modulation signal in the baseband
When quadrature demodulating a signal, the second voltage controlled oscillator
These oscillation signals are divided by 2M to obtain two orthogonal signals.
The second frequency dividing means and the orthogonal frequency obtained by the second frequency dividing means.
Using the two signals as the second oscillation signal,
Quadrature demodulation of the high frequency modulation signal to the baseband signal
And a quadrature demodulator that modulates the baseband signal into the high-frequency modulation signal.
The oscillation signal from the first voltage controlled oscillator
First phase shift to obtain two orthogonal signals by phase shift of π / 2
Means, or converting the high-frequency modulated signal to the baseband signal.
When performing quadrature demodulation to the signal, the second voltage controlled oscillator
Phase shift of the oscillation signal of π / 2 to obtain two orthogonal signals
And at least one of a second phase shifter and an oscillation signal from the first voltage controlled oscillator or the second
At least one of the oscillation signals from the voltage-controlled oscillator of No. 2
On the other hand, signals that differ in phase from this by π / 2 are mixed.
And a mobile communication device. 2. A two-way communication using a plurality of frequency bands.
A first oscillator and the first oscillator
The frequency of the output signal of the oscillator is divided or multiplied to form a first
And a circuit for generating a frequency signal.
Circuit, a second oscillator and an output of the second oscillator.
The frequency of the force signal is divided or multiplied to obtain the second frequency signal.
And a circuit for generating a signal for reception.
And provided in a circuit for generating a signal for this transmission,
Generate a signal shifted by π / 2 from the signal of the first frequency
And the phase-shifted signal and the signal of the first frequency.
Circuit that mixes with the signal or the circuit that generates the signal for reception.
Π / 2 phase shift from the second frequency signal.
And a circuit for generating the phase-shifted signal.
At least one of the circuits for mixing with the second frequency signal;
Or a circuit for generating the signal for transmission
At least one of circuits for generating the signal for reception
Signals that differ in phase by π / 2
And a mobile communication device.