JPH059019U - Output adjustment device for auto power control circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] An output adjustment device for an auto power control circuit in a wireless device, which does not require adjustment by hardware, and can reduce the number of hardware parts to reduce the mounting space, which is advantageous for downsizing. In addition, the adjustment / setting is easy, and it is possible to prevent the adjustment from becoming impossible due to the variations in the transmission power amplification circuit and the APC detection circuit. [Structure] The transmission power amplifier circuit 1 is feedback-controlled by a difference voltage between its output and a predetermined reference voltage.
The data processing device 7 changes the transmission output data for generating the reference voltage by inputting a command from the input device 11. The output can be adjusted by storing transmission output data when the output reaches a predetermined set value as information corresponding to the set value.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an output adjusting device for adjusting an antenna output in an automatic transmission output control circuit (referred to as an auto power control circuit or an APC circuit) used in a mobile phone and other wireless devices.

[0002]

[Prior Art]

 Conventionally, in this kind of APC circuit, mainly the initial adjustment of the transmission output is performed in the configuration as shown in FIG. Hereinafter, description will be given with reference to FIG. The output of the transmission power amplifier circuit 1 to which a transmission signal having a constant input is given is supplied to the antenna via the output line 2. An APC detection circuit 4 is connected to the output line 2, and the APC detection circuit 4 detects electric power proportional to the antenna output. This detection output is used as one input signal of the error amplifying circuit 5 via the variable resistor VR1, and the other input signal of this error amplifying circuit 5 is the voltage dividing circuit 20 to which a plurality of variable resistors VR2 are connected. These reference voltages are given. This error amplification circuit 5 applies feedback control to the transmission power amplification circuit 1 through the control circuit 6 according to the difference voltage of the input voltage. As a result, the antenna output power is controlled to a predetermined value. Then, in this circuit, the variable resistance VR1 sets the MAX (maximum) power level, and the variable resistance VR2 sets the MIN (minimum) power level.

[0003]

[Problems to be solved by the device]

 However, such a conventional output adjustment circuit requires adjustment by hardware and requires a lot of mounting space due to the large number of parts, which is not suitable for downsizing of equipment. Further, since it is necessary to adjust the variable resistor VR1 with the reference voltage at the MAX power level and the variable resistor VR2 with the reference voltage at the MIN power level, mutual adjustment becomes troublesome and the transmission power amplifier circuit 1 When the fluctuation of the APC detection circuit 4 is large, the variable resistors VR1 and VR2 may not be able to adjust. The present invention solves the above-mentioned problems, does not require adjustment by hardware, reduces the number of hardware components, reduces the mounting space, is advantageous for downsizing, and is easy to adjust and set. Therefore, it is an object of the present invention to provide an output adjustment device for an auto power control circuit, which does not prevent adjustment due to variations in the transmission power amplification circuit and the APC detection circuit.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an output adjustment device for an automatic power control circuit that supplies the output of a transmission power amplifier circuit to an antenna and controls the antenna output to a predetermined value. Detecting circuit, a control circuit for feedback-controlling the transmission power amplification circuit by the difference voltage between the detection output and a predetermined reference voltage, and transmission output data for generating the reference voltage. The data processing means, the D / A converter which converts the transmission output data into analog data and uses it as the reference voltage, and the input means which inputs an operation command to the data processing means. Is a means for changing the transmission output data based on a command from the input means, and an antenna output is changed by changing the transmission output data. Upon reaching a predetermined setting value, in which a storage means for storing transmission power data of that time as information corresponding to the set value.

[0005]

[Action]

 According to the above configuration, the output of the transmission power amplification circuit is detected by the detection circuit, and the control circuit feedback-controls the transmission power amplification circuit by the difference voltage between this detection output and a predetermined reference voltage. The data processing means outputs transmission output data for generating the reference voltage. By inputting an operation command from the input means to the data processing means, the data processing means changes the transmission output data based on it, and changes the transmission output data to change the antenna output. In adjusting the output, the transmission output data when the antenna output reaches a predetermined set value is stored as information corresponding to the set value. By storing the information in this way, a predetermined antenna output can be obtained by calling this information thereafter.

[0006]

【Example】

 The configuration and operation of one embodiment of the present invention will be described with reference to the drawings. The auto power control circuit (hereinafter referred to as the APC circuit) of this embodiment is mounted on a mobile phone or the like. A transmission signal having a constant input is applied to the transmission power amplifier circuit 1, where the power is amplified and supplied to the antenna via the output line 2. An APC detection circuit 4 is connected to the output line 2. The APC detection circuit 4 detects electric power proportional to the antenna output. The error amplification circuit 5 amplifies a difference voltage between the above-mentioned detected output voltage and a predetermined reference voltage described later, and feeds back the transmission power amplification circuit 1 through the control circuit 6. As a result, the antenna output power is controlled to a predetermined value.

The APC circuit has a data processing device 7 (hereinafter referred to as a CPU) such as a microcomputer, and the CPU 7 outputs transmission output data which is a digital signal, and the D / A converter 8 analogizes the transmission output data. Convert it to data and use it as the reference voltage. Further, the CPU 7 is provided with an input device 11 such as a keyboard for inputting operation commands and a storage device (memory) 12 for storing information. The CPU 7 has a functional configuration that changes the transmission output data based on a command from the input device 11, and can change the antenna output by changing the transmission output data. A memory built in the CPU 7 may be used as the storage device 12.

When initializing the output adjustment, the UP key and the DOWN key of the input device 11 are operated to give a command to the CPU 7, and the antenna output at that time is measured. The transmission output data when this reaches a predetermined set value is stored in the storage device 12 as information corresponding to the set value. This storage operation is performed by operating the ENT key of the input device 11. This adjustment procedure will be specifically described. Now, when setting the power level in 6 steps, for example, if "6" is the MAX (maximum) power and "1" is the MIN (minimum) power, operate the UP key and DOWN key of the input device 11, The transmission output data is sent from the CPU 7 to the D / A converter 8 and adjusted so that the antenna output has the MAX power of "6". When the set value is reached, the ENT key is pressed to store the data at that time in the storage device 12. By performing this operation in sequence "5", "4", ... "1", the output adjustment setting is completed.

[0009]

[Effect of the device]

 As described above, according to the present invention, a command is given to the data processing means from the input means to change the transmission output data, thereby changing the antenna output and storing the data when it reaches a predetermined set value. Since it is possible to adjust the output by doing so, it is not necessary to adjust hardware such as variable resistance as in the past, and since there are few hardware parts, the mounting space is reduced, which is advantageous for downsizing. .. Also, the adjustment work becomes easy. Furthermore, it is possible to prevent the adjustment from becoming impossible due to variations in the transmission power amplifier circuit and the APC detection circuit.

[Brief description of drawings]

FIG. 1 is a block diagram of an auto power control circuit according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional auto power control circuit.

[Explanation of symbols]

 1 Transmission Power Amplifier Circuit 4 APC Detection Circuit 5 Error Amplifier Circuit 6 Control Circuit 7 Data Processing Device (CPU) 8 D / A Converter 11 Input Device (Keyboard) 12 Storage Device (Memory)

Claims (1)

[Claims for utility model registration] 1. An automatic power control circuit for feeding the output of a transmission power amplification circuit to an antenna and controlling the output of the antenna to a predetermined value. Detection of detecting the output of the transmission power amplification circuit. A circuit, a control circuit for feedback-controlling the transmission power amplification circuit with a differential voltage between the detected output and a predetermined reference voltage, data processing means for outputting transmission output data for generating the reference voltage, A D / A converter that converts the transmission output data into analog data and uses this as the reference voltage, and an input unit that inputs an operation command to the data processing unit are provided, and the data processing unit outputs the data from the input unit. A means for changing the transmission output data based on a command, and a change in the transmission output data changes the antenna output When reaching the output adjusting device of the automatic power control circuit, characterized in that it has a storage means for storing transmission power data of that time as information corresponding to the set value.