JPH07123021A - Radio telephone set - Google Patents

Abstract

PURPOSE:To reduce an operation disabled period by monitoring a control voltage of transmission power and an oscillated reference frequency so as to display warning. CONSTITUTION:An output voltage monitor circuit 5 monitors a control voltage 401 being the output of a control voltage generating circuit 4 and outputs a fault output alarm signal 501 to a control section 8 when the level of the control voltage reaches a predetermined fault prediction level or below by which a fault state of the circuit 4 is predicted. Furthermore, an oscillating frequency monitor circuit 7 monitors a reference frequency 1101 oscillated from a crystal oscillator 11 and outputs a fault frequency alarm signal 701 to the control section 8 when the reference frequency deviates from a fault prediction frequency range being a predetermined range used to predict a fault in the oscillator 11. Then the control section 8 displays a fault occurrence advance warning onto a display device 9 to warn the user of the possibility of a fault.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless telephone, and more particularly to a wireless telephone used for mobile communication.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional radio telephone of this type has an antenna 20 and a duplexer 21 for switching between transmission and reception.
A reception circuit 22, a transmission power amplifier circuit 23, a voltage generation circuit 24 that generates a control voltage 241 that controls the output of the transmission power amplifier circuit 23, a crystal oscillator 25 that generates a reference frequency necessary for modulation and demodulation, A modulation / demodulation circuit 26, a control unit 27 that controls the entire operation, and a display 28 that displays commands from the control unit 27.

Next, the operation when this radio telephone fails will be described.

Consider, for example, the case where the transmission power amplifier circuit 23 has deteriorated its function and its output has decreased, so that the control voltage generation circuit 24 attempts to increase the output of the power amplifier circuit 23 by lowering the control voltage than usual. Power amplifier 23 to loosen the control and increase the output. Therefore, the output of the power amplification circuit 23 operates in the same manner as in the normal state although the function is deteriorated. At the time when the transmission power amplifier circuit 23 completely failed and stopped functioning, the control unit 27 ordered the display 28 to display "failure death" or the like by the operation of the built-in self-diagnosis function.

[0005]

The self-diagnosis function of the conventional radiotelephone displays a failure indication for the first time when the radiotelephone is completely out of order and has stopped functioning. There is a problem that the wireless telephone cannot be used until it is completed.

Further, in the conventional radio telephone, the transmission power amplifier circuit and the crystal oscillator for generating the reference frequency often fail.
In addition, there is a problem that the failure rate is higher than that of other components.

The object of the present invention is to solve the above-mentioned problems, and in particular, to warn the user in advance that either the power amplifier circuit or the crystal oscillator will fail, and to significantly reduce the period during which the device cannot be used. To provide a telephone.

[0008]

The wireless telephone of the present invention comprises:
In a wireless telephone operated for mobile communication, the control voltage is the transmission power while monitoring the level of the control voltage output by a control voltage generation circuit that generates a control voltage for controlling the transmission power output by the transmission power amplification circuit. Output voltage monitoring means for outputting an abnormal output alarm signal for predicting an abnormality of the output of the transmission power amplifier circuit in advance when the abnormality prediction judgment level for predicting the abnormality of is lower than or equal to the abnormality prediction determination level, Oscillation of the crystal oscillator when the reference frequency exceeds a predetermined abnormality prediction frequency fluctuation range for predicting abnormality of the oscillation frequency in advance while monitoring the fluctuation of the oscillation frequency of the crystal oscillator that generates the required reference frequency An oscillation frequency monitoring means for outputting an abnormal frequency alarm signal for predicting a frequency abnormality in advance; And a fault pre-display means for visually displaying the abnormal frequency alarm signal as failure precaution.

The radio telephone according to the present invention has a structure in which the level of the transmission power output from the transmission power amplifier circuit is reduced or increased in accordance with the control voltage output from the control voltage generation circuit. .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

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

In this embodiment, an antenna 1 for transmitting and receiving,
The duplexer 2, the reception circuit 10, the transmission power amplification circuit 3, the voltage generation circuit 4 that generates the control voltage 401 that controls the output of the transmission power amplification circuit 3, and the control voltage 401 that the control voltage generation circuit 4 outputs are An output voltage monitoring circuit 5 for monitoring, a modulation / demodulation circuit 6, a crystal oscillator 11 for generating a reference frequency 1101 necessary for modulation / demodulation, an oscillation frequency monitoring circuit 7 for monitoring the reference frequency 1101 generated by the crystal oscillator 11,
It is provided with a display 9 for displaying a preliminary warning of a failure and a control section 8 for instructing display on the display 9 together with control of the entire operation, the control voltage generating circuit 4 serving as an output voltage monitoring means, and the oscillation frequency monitoring circuit 7 serving as an oscillation frequency. The monitoring means, and the controller 8 and the display 9 constitute failure advance display means.

Normally, during transmission of a radio telephone, the transmission power amplifier circuit 3 receives the control voltage 401 output from the control voltage generation circuit 4, and outputs the transmission power controlled according to the voltage value. When the power amplifying circuit 3 deteriorates in function and cannot output sufficient transmission power, the control voltage generating circuit 4 supplies a control voltage lower than the steady state to the power amplifying circuit 3 in order to maintain the output of the required transmission power. To do.

The output voltage monitoring circuit 5 monitors the control voltage 401 output from the control voltage generation circuit 4, and the control voltage 401 is below a predetermined abnormality prediction level at which an abnormal state of the transmission power amplification circuit 4 can be predicted. When it becomes, the abnormal output alarm signal 501 is output to the control unit 8.

In many cases, the frequency used inside the circuit of the radio telephone uses the oscillation frequency of the crystal oscillator 11 as a source. However, this crystal oscillator 1
No. 1 is likely to cause a failure in which the oscillation frequency shifts or oscillation stops.

The oscillation frequency monitoring circuit 7 includes a crystal oscillator 11
The oscillating reference frequency 1101 is monitored, and when the reference frequency 1101 exceeds the abnormality prediction frequency fluctuation range of a predetermined range for predicting the abnormality of the crystal oscillator, the abnormal frequency alarm signal 701 is output to the control unit 8. Upon receiving the abnormal output alarm signal 501 or the abnormal frequency alarm signal 701, the control unit 8
A failure advance warning is displayed on the display 9 to warn the user beforehand that there is a risk of failure.

In this way, it is possible to preliminarily warn of an abnormality in the transmission output and an abnormality in the reference frequency, and it is possible to greatly reduce the period during which the wireless telephone cannot be used.

[0018]

As described above, according to the present invention, the control voltage for controlling the transmission power and the oscillating fundamental frequency are monitored and the advance warning is displayed to display the advance warning. On the other hand, since the user can be warned before a failure occurs, the period during which the wireless telephone cannot be used can be significantly shortened, and the failure rate of the wireless telephone can be significantly reduced. .

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional wireless telephone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 antenna 2 duplexer 3 transmission power amplification circuit 4 control voltage generation circuit 5 output voltage monitoring circuit 6 modulation / demodulation circuit 7 output frequency monitoring circuit 8 control unit 9 display 10 receiving circuit 11 crystal oscillator

Claims (2)

[Claims] 1. In a wireless telephone operated for mobile communication, the control is performed while monitoring the level of the control voltage output from a control voltage generation circuit that generates a control voltage for controlling the transmission power output from the transmission power amplification circuit. Output voltage monitoring means for outputting an abnormal output alarm signal for predicting an abnormality in the output of the transmission power amplifier circuit in advance when a voltage becomes equal to or lower than an abnormality prediction determination level for predicting an abnormality in the transmission power in advance; When the reference frequency exceeds a predetermined abnormality prediction frequency fluctuation range for predicting abnormality of the oscillation frequency in advance while monitoring the fluctuation of the oscillation frequency of the crystal oscillator that generates the reference frequency necessary for modulation and demodulation of the wireless telephone Oscillation frequency monitoring means for outputting an abnormal frequency alarm signal for predicting abnormal oscillation frequency of the crystal oscillator in advance, and the abnormal output alarm And a fault advance display means for visually displaying the signal and the abnormal frequency alarm signal as a fault advance advance warning. 2. The level of the transmission power output from the transmission power amplifier circuit decreases or increases in response to the control voltage output from the control voltage generation circuit being large or small. Wireless phone.