JPH05160770A - Portable telephone system - Google Patents

Abstract

PURPOSE:To provide a portable telephone system in which a power amplifier of a power amplification booster is operated in a suitable state when the portable telephone set is connected to the power amplification booster so as to implement the transmission of multistage changeover with the same standard as that of an automobile telephone set. CONSTITUTION:A reference voltage generator 24 of a portable telephone set A generates a reference voltage suitable for a command level of a transmission output from a base station. A voltage comparator 26 compares the reference voltage with a detection output of power amplifiers 17 and a power controller 20 controls the power amplifiers 17. A voltage comparator 12 compares a reference voltage of a reference voltage generator 10 switched to be in the connection state with a detection output of a power amplifier 3 in the portable telephone set A. A power controller 6 controls the power amplifier 3 based on a control output so as to be lower by several levels than the command level of the transmission output thereby optimizing the operation of the power amplifier 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone device in which a portable telephone (small radio device) is connected to a power amplification booster and multistage switching transmission of the same standard as an automobile telephone can be performed.

[0002]

2. Description of the Related Art FIG. 3 is a schematic block diagram showing a conventional portable telephone device.

In FIG. 3, A is a mobile phone and B is a power amplification booster. Describing the mobile phone A, 101 is a control device for controlling the whole, 102 is a front part of the transmitter, and an instruction from the base station or the control device 1
01 Multi-channel switching by original judgment, sending one of them, data signal for connection, voice signal for call,
It is modulated by other signals. Reference numeral 103 denotes a power amplifier that is excited by the output of the transmitter front-end portion 102 and sends an amplified output, 104 is an antenna switch, 105 is an antenna,
A power controller 106 controls the power amplifier 103, and is connected to a rechargeable battery (not shown) through a terminal 107. Reference numeral 108 is a directional coupler that extracts a part of the traveling wave component of the transmission output, 109 is a detector that detects the traveling wave component extracted by the directional coupler 108, 110 is a reference voltage generator, and the transmission output The reference voltage instructed by the control signal 111 is generated, and the generation level is changed by the connection information signal 112. Reference numeral 113 denotes a voltage comparator, which detects the detection output sent from the detector 109 and the reference voltage generator 11
The reference voltage sent from 0 is compared, and the power controller 106 is driven based on the result. 114 is an output terminal of the transmission output, 115 is an output terminal of the transmission output control signal 111,
Reference numeral 116 is an input terminal for the connection information signal 112.

Explaining the power amplification booster B,
A power amplifier 117 is connected to the output terminal 114 of the mobile phone A by the input terminal 118, is excited by the output from the mobile phone A, and outputs an amplified output. 119
Is an antenna, and 120 is a power controller for controlling the power amplifier 117, which is connected to a vehicle battery (not shown) through a terminal 121. 122 is a directional coupler that extracts a part of the traveling wave component of the transmission output, 123 is a detector that detects the traveling wave component extracted by the directional coupler 122,
Reference numeral 124 is a reference voltage generator, which is connected to the output terminal 115 of the mobile phone A by an input terminal 125 and generates a reference voltage instructed by the transmission output control signal 111. 1
Reference numeral 26 is a voltage comparator, which compares the detection output sent from the detector 123 with the reference voltage sent from the reference voltage generator 124, and drives the power controller 120 based on the result. 127 is a mobile phone A through an input terminal 128
This is the ground connected to the output terminal 116 of.

The operation of the above arrangement will be described below. First, the operation of using the mobile phone A alone will be described.

The power amplifier 103 is a front stage 102 of the transmitter.
Is excited by the output of the directional coupler 10
8. Send to the antenna 105 via the antenna switching unit 104. This causes the antenna 105 to transmit. During this time, a part of the traveling wave component is extracted from the amplified output of the power amplifier 103 by the directional coupler 108, detected by the detector 109, and sent to the voltage comparator 113. On the other hand, the transmission output control signal 111 transmitted from the base station is the control device 1
01 is sent to the reference voltage generator 110. The reference voltage generator 110 generates a reference voltage corresponding to the transmission output control signal 111 and sends it to the voltage comparator 113. The voltage comparator 113 compares the reference voltage with the detection output, and sends the difference voltage to the power controller 106. Power controller 10
Reference numeral 6 controls the supply voltage of the power amplifier 103 so that the detection output input to the voltage comparator 113 is balanced with the reference voltage.

Next, the portable telephone A is replaced with the power amplification booster B.
The operation of connecting to and using will be described.

The power for operating the power amplification booster B is
It is supplied when the transmitter of the mobile phone A operates. When the ground 127 of the power amplification booster B is connected to the input terminal 116 of the mobile phone A through the output terminal 128, the connection information signal 112 is input to the control device 101. The control device 101 sends this connection information signal 112 to the reference voltage generator 1
10, the generation level of the reference voltage generator 110 is changed to a predetermined constant level, and the antenna switching unit 104 is switched to the output terminal 114 side, that is, the power amplification booster B side. Along with this, the power amplifier 117 of the power amplification booster B is excited by the output of the mobile phone A through the output terminal 114 and the input terminal 118, and the amplified output is transmitted through the directional coupler 122 to the antenna 1.
It sends to 19. This causes the antenna 119 to transmit. During this time, a part of the traveling wave component is extracted from the amplified outputs of the power amplifiers 103 and 117 by the directional couplers 108 and 122, detected by the detectors 109 and 123, and sent to the voltage comparators 113 and 126. On the other hand, the transmission output control signal 111 sent from the base station is sent to the reference voltage generator 110 which is switched to the power amplification booster connection operation by the control device 101, and is also sent to the reference terminal via the output terminal 115 and the input terminal 125. It is sent to the voltage generator 124.
On the side of the mobile phone A, the power amplifier 103 is controlled by the same operation as above. On the other hand, on the power amplification booster B side, the transmission output control signal 11
A reference voltage corresponding to 1 is generated and sent to the voltage comparator 126. The voltage comparator 126 compares the reference voltage with the detection output, and sends the difference voltage to the power controller 120. The power controller 120 controls the supply voltage of the power amplifier 117 so that the detection output input to the voltage comparator 126 and the reference voltage are balanced.

[0009]

However, in the configuration of the conventional example as described above, the difference between the maximum output and the minimum output of the transmission output instructed by the base station is 30 dB (1/100).
0). Therefore, the relationship between the minimum output and the excitation power for obtaining the maximum output is −20 dB (1/100), and there is a technical problem that the power amplifier 117 of the power amplification booster B operates as an attenuator. ..

The present invention solves the above-mentioned conventional problems, and when a portable telephone is connected to a power amplification booster to perform multi-stage switching transmission of the same standard as an automobile telephone, the power of the power amplification booster is increased. It is an object of the present invention to provide a mobile phone device capable of operating an amplifier in a suitable state, thus improving the power efficiency of the entire system and allowing each part to operate normally. It is a thing.

[0011]

In order to achieve the above object, the present invention provides a power amplifier excited by an output of a front stage of a transmitter and a reference voltage generator for generating a reference voltage according to an instruction of a transmission output control signal. , A voltage comparator that compares the detection output of these power amplifier outputs and a reference voltage, a mobile phone having a power controller that controls the power amplifier based on the output of this voltage comparator, and an output of the mobile phone. The power amplifier to be excited, the reference voltage generator that generates the reference voltage corresponding to the instruction of the transmission output control signal, the detection output of these power amplifier outputs and the voltage comparator that compares the reference voltage, the output of this voltage comparator. And a power amplification booster having a power controller for controlling a power amplifier excited by the output of the mobile phone. When connecting the motor, the output of the mobile phone is lower than the indicated level of the transmission output control signal is one that is configured to be switched in multiple stages.

The output of the mobile phone can be controlled as described above by controlling the reference voltage of the reference voltage generator of the mobile phone according to the information on the connection between the mobile phone and the power amplification booster.

[0013]

Therefore, according to the present invention, when the portable telephone is used alone, the output is automatically controlled by comparing the detection output of the power amplifier of the portable telephone with the reference voltage.
When the mobile phone is used by connecting it to the power amplification booster, the power amplification booster side sets the reference voltage used for comparison with the detection output of the power amplifier to a predetermined transmission output corresponding to the specified transmission output. The power amplifier is controlled so that the transmission power is controlled to be the optimum output on the mobile phone side by lowering the transmission output from the base station. The power amplifier of the power amplification booster can be operated in an optimum state without exciting the power amplifier of the power amplification booster at the level of the transmission output thus instructed or more.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram showing a portable telephone device according to an embodiment of the present invention. In FIG. 1, A is a mobile phone, and B is a power amplification booster for switching the wireless output of low power transmission in multiple stages according to an instruction from the base station and transmitting it. Describing the mobile phone A, 1 is a control device (CPU) for controlling the whole, 2 is a front part of a transmitter, and multi-channel switching is performed by an instruction from a base station or by the control device 1's own judgment. Are transmitted and modulated by a data signal for connection, a voice signal for communication, and other signals. 3 is a power amplifier that is excited by the output of the transmitter front stage 2 and sends out an amplified output, 4 is an antenna switcher, 5 is an antenna, and 6 is a power controller that controls the power amplifier 3, and is a rechargeable terminal 7 It is connected to a battery (not shown). 8 is a directional coupler for extracting a part of the traveling wave component of the transmission output, 9 is a detector for detecting the traveling wave component extracted by the directional coupler 8, 10 is a reference voltage generator, and the transmission output A reference voltage is generated according to an instruction from the control signal (a, b, c) 11. Reference numeral 12 is a voltage comparator, which compares the detection output sent from the detector 9 with the reference voltage sent from the reference voltage generator 10, and drives the power controller 6 based on the result. 13 is an output terminal for transmission output, 14
Is an output terminal of the transmission output control signal 11, and 15 is an input terminal of the connection information signal 16.

Explaining the power amplification booster B,
Reference numeral 17 is a power amplifier, which is connected to the output terminal 13 of the mobile phone A by an input terminal 18, is excited by the output from the mobile phone A, and outputs an amplified output. Reference numeral 19 is an automobile antenna, 20 is a power controller for controlling the power amplifier 17, and a battery of the automobile (not shown) is provided through a terminal 21.
It is connected to the. 22 is a directional coupler for extracting a part of the traveling wave component of the transmission output, 23 is a detector for detecting the traveling wave component extracted by the directional coupler 22, 24 is a reference voltage generator, and an input terminal A reference voltage corresponding to the level instructed by the transmission output control signal 11 is generated by being connected to the output terminal 14 of the mobile phone A by 25. Reference numeral 26 is a voltage comparator, which compares the detection output sent from the detector 23 with the reference voltage sent from the reference voltage generator 24, and drives the power controller 20 based on the result. Two
Reference numeral 7 is a ground connected to the input terminal 15 of the mobile phone A by the output terminal 28.

In the reference voltage generator 10 of the portable telephone set A, the output from the power amplifier 3 responds to the instruction level of the transmission output from the base station by the connection information signal 16 at the time of connection with the power amplification booster B. The control device 1 is configured to switch and control the reference voltage so that it can be switched in multiple stages by several ranks.

The operation of the above arrangement will be described below. First, the operation of using the mobile phone A alone will be described.

When the mobile phone A operates independently, the antenna switch 4 is switched to the antenna 5 side as shown by the dotted line. Then, the power amplifier 3 is excited by the output of the front stage 2 of the transmitter, and the amplified output is sent to the antenna 5 via the directional coupler 8 and the antenna switching device 4. This causes the antenna 5 to transmit. During this period, a part of the traveling wave component is extracted from the amplified output of the power amplifier 3 by the directional coupler 8, detected by the detector 9, and sent to the voltage comparator 12. On the other hand, the transmission output control signal 11 sent from the base station
Is sent to the reference voltage generator 10 by the control device 1. The reference voltage generator 10 generates a reference voltage corresponding to the instruction level of the transmission output control signal 11, and the voltage comparator 12
Send to. The voltage comparator 12 compares the reference voltage with the detection output, and sends the difference voltage to the power controller 6. The power controller 6 controls to increase or decrease the supply voltage of the power amplifier 3 so that the detection output input to the voltage comparator 12 is balanced with the reference voltage. When the mobile phone A is used alone, since the control device 1 notifies the base station, the base station does not instruct the maximum output of the mobile phone, and therefore the mobile phone A must be transmitted with the specified output. You can

Next, the mobile phone A is connected to the power amplification booster B.
The operation of connecting to and using will be described.

The power for operating the power amplification booster B is
It is supplied when the transmitter of the mobile phone A operates. When the ground 27 of the power amplification booster B is connected to the input terminal 15 of the mobile phone A by the output terminal 28, the control device 1
The connection information signal 16 is input to. As a result, the control device 1 causes the antenna switching unit 4 to output the output terminal 13 as shown by the solid line.
Side, that is, the power amplification booster B side, and the generation level for the transmission output control signal 11 of the reference voltage generator 10 is reduced. Further, the control device 1 notifies the base station that the mobile phone has been switched to a state in which the mobile phone output (for example, 3 W) is possible, and causes the mobile phone to operate in response to a call (note that the control device 1 notifies the base station only when the mobile phone A is operated independently, and when the mobile phone A is used by connecting to the power amplification booster B, the base station operates the mobile phone without notifying the base station. You may choose to let it.) Accordingly, the power amplifier 17 is excited by the output of the mobile phone A through the switch 4, the output terminal 13 and the input terminal 18, and the amplified output is used as the directional coupler 2.
2 to the antenna 19. This causes the antenna 19 to transmit. During this time, a part of the traveling wave component is extracted from the amplified outputs of the power amplifiers 3 and 17 by the directional couplers 8 and 22, detected by the detectors 9 and 23, and sent to the voltage comparators 12 and 26. On the other hand, when the transmission output control signal 11 is sent from the base station, the control device 1 of the mobile phone A sends this transmission output control signal 11 to the reference voltage generator 10 which has been switched to its power amplification booster connection operation. At the same time, it is sent to the reference voltage generator 24 of the power amplification booster B via the output terminal 14 and the input terminal 25. On the power amplification booster B side, the reference voltage generator 24 generates a reference voltage corresponding to the instruction level of the transmission output control signal 11,
It is sent to the voltage comparator 26. The voltage comparator 26 compares the reference voltage with the detection output from the detector 23, and sends the difference voltage to the power controller 20. The power controller 20 controls the supply voltage of the power amplifier 17 so that the detection output input to the voltage comparator 26 is balanced with the reference voltage. On the other hand, on the side of the mobile phone A, the reference voltage generator 10 generates a reference voltage which is lower than the instruction level of the transmission output control signal 11 by several ranks and sends it to the voltage comparator 12. Similarly to the above, the voltage comparator 12 compares the reference voltage with the detection output from the detector 9, and the power controller 6 controls the power amplifier 3. At this time, the reference voltage generator 10 controls the reference voltage so that the output of the mobile phone A is several ranks lower than the instruction level of the transmission output control signal 11 as described above. The power amplifier 17 of the power amplification booster B will not be excited at the command level 11 (single operation level) or higher. Then, it can be transmitted with a specified output.

FIG. 2 shows an example of the relationship between the transmission output control signal 11 and the transmission output in the mobile phone A and the relationship between the transmission output control signal 11 in the power amplification booster B and the transmission output and the excitation power. In this example, when the output Pb on the power amplification booster B side is 3 W, the excitation power Pd on the mobile phone A side becomes 192 mW, which is lower than the normal transmission output Pa, and the excitation power Pd decreases as the output gradually decreases.
At a certain level, for example, rank 4 of 77 mW or less, the excitation power Pd is constant. In this way, the relationship between the power amplifier 17 of the power amplification booster B and the mobile phone A is set to be optimum.

In the above embodiment, the excitation is variable as the output level owned by the mobile phone A.
The reference voltage is converted to the power amplification booster B by the connection information signal 16.
The excitation may be varied by setting so as to obtain the optimum operation of.

[0024]

As described above, according to the present invention, when the portable telephone is used alone, the output is automatically controlled by comparing the detection output of the power amplifier of the portable telephone with the reference voltage. When the mobile phone is used by connecting it to the power amplification booster, the power amplification booster side has a predetermined transmission output corresponding to the specified transmission output of the reference voltage used for comparison with the detection output of the power amplifier. The power amplifier is controlled so as to satisfy the following condition, and on the mobile phone side, the transmission power is controlled to be lower than the instruction level of the transmission output instructed by the base station so as to obtain the optimum output. The power amplifier of the power amplification booster can be operated in an optimum state without exciting the power amplifier of the power amplification booster at the level of the transmission output thus instructed or more. Therefore, the operating point can be set by paying attention to power efficiency, spurious radiation, distortion, etc., so that the power efficiency of the entire system can be improved and each part can be operated normally.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a mobile phone device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a transmission output of a mobile phone, a transmission output of a power amplification booster, and an excitation output with respect to a transmission output control signal in the mobile phone device.

FIG. 3 is a schematic configuration diagram showing a conventional mobile phone device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 control device 2 front part of transmitter 3 power amplifier 6 power controller 8 directional coupler 9 detector 10 reference voltage generator 11 transmission output control signal 12 voltage comparator 16 connection information signal 17 power amplifier 20 power controller 22 Directional coupler 23 Detector 24 Reference voltage generator 26 Voltage comparator A Mobile phone B Power amplification booster

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroi Yoshiho, 3-1, Tsunashima East, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd. (72) Inventor, Eiji Omori 3-17, Hommachi, Hoya No. 4

Claims (1)

[Claims] 1. A power amplifier excited by an output of a front stage of a transmitter, a reference voltage generator for generating a reference voltage according to an instruction of a transmission output control signal, and a voltage for comparing a detection output and a reference voltage of outputs of these power amplifiers. A comparator, a mobile phone having a power controller for controlling the power amplifier based on the output of the voltage comparator, a power amplifier excited by the output of the mobile phone, and a reference corresponding to an instruction of a transmission output control signal. Controls the reference voltage generator that generates the voltage, the detection output of the output of these power amplifiers and the voltage comparator that compares the reference voltage, and the power amplifier excited by the output of the mobile phone based on the output of this voltage comparator And a power amplification booster having a power controller for controlling the output of the mobile phone when the mobile phone is connected to the power amplification booster. A mobile phone device configured to be switched in multiple stages at a level lower than an instruction level of a control signal.