JP4457514B2 - Wireless communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless communication device including a mobile phone, a PHS phone, and a portable information terminal having a wireless communication function, and more particularly to a wireless communication device in which components constituting a front end unit are modularized.
[0002]
[Prior art]
A conventional example will be described below.
[0003]
(1): Definition of terms The terms used in this specification are explained as follows.
[0004]
a: PA (Power Amplifier) is a power amplifier.
[0005]
b: APC (Auto Power Control) circuit is a circuit for performing PA auto power control.
[0006]
c: A wireless communication device is a device including a mobile phone, a PHS phone, a portable information terminal having a wireless communication function, and the like.
[0007]
d: DAC (Digital to Analog Converter) is a digital / analog converter for converting a digital signal into an analog signal.
[0008]
e: ADC (Analog to Digital Converter) is an analog / digital converter that converts an analog signal into a digital signal.
[0009]
f: PC is a personal computer.
[0010]
g: DSP (Digital Signal Processor) is a microprocessor dedicated to digital signal processing.
[0011]
h: VCO (Voltage-Controlled Oscillator) is a voltage controlled oscillator.
[0012]
i: LNA (Low Noise Amplifier) is a low noise amplifier.
[0013]
j: RF (Radio Frequency) means high frequency, and “RF circuit part” means high frequency circuit part.
[0014]
k: GSM (The Global System For Mobiles) is the name of a European standard digital cellular phone system. GSM uses TDMA / TDD that multiplexes 8 channels. In addition, the GSM, use a frequency 900MH _Z "GSM900", use the frequency 1.8GH _Z "GSM1800", use the frequency 1.9GH _Z there is a "GSM1900".
[0015]
l: DCS (Digital Cellular System) is a type of communication system used in automobiles, mobile phone systems, and the like.
[0016]
m: LPF (Low Pass Filter) is a low-pass filter.
[0017]
(2): Description of Conventional Example by Specific Example Conventionally, a GSM mobile phone enters a predetermined output level while measuring the output from the inspection terminal in order to adjust the output power variation in the inspection process. Thus, the APC voltage was changed to find an appropriate value. Then, the adjustment is performed by storing a digital value corresponding to the APC voltage value in a memory.
[0018]
In "Power Class4" in the cellular phone of the GSM900 and DCS1800 dual-mode, GSM900 15 power levels, carried out with the 16 power level adjustment in DCS1800, until 890MH _Z in GSM900, the frequency correction from 170MH _Z to 1785MH _Z in DCS1800 It was.
[0019]
[Problems to be solved by the invention]
The conventional apparatus as described above has the following problems.
[0020]
Normally, the adjustment on the production line cannot be performed at all frequencies and power levels. Conventionally, at least the center channel power level adjustment and frequency correction at one power level are performed based on actual data at the time of development. It was.
[0021]
The reason for the need for the adjustment is that the APC generated by the variation of each component and the matching deviation due to the load variation after the connection of each component and the conversion from the digital value (DAC value) on which the APC voltage is based into the analog signal. This is because it is necessary to adjust the voltage variation. However, even if the power level adjustment time could be shortened from the actual data, the adjustment could not be eliminated.
[0022]
The present invention solves such a conventional problem, modularizes front end parts including PA, and ships a product whose output has been adjusted in the module state by the module supplier in PA output adjustment, An object of the present invention is to make it possible to reduce the main board design time, the inspection time, and the cost reduction by eliminating the PA output adjustment time in the final assembly operator of the wireless communication apparatus.
[0023]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows.
[0024]
(1): In a wireless communication device, at least a power amplifier for power amplification, an APC circuit that controls the power amplifier, a detection circuit that detects the output of the power amplifier, and amplifies by the power amplifier A directional coupler that demultiplexes the received signal, a low-pass filter that removes high-frequency components of the signal output from the directional coupler, an antenna switch that switches between transmission and reception, a diplexer, and a SAW filter that restricts the received signal A module obtained by modularizing a component including a power level adjusting step of acquiring characteristics of an antenna output in a module state and an APC voltage value that is an output voltage of an APC terminal, and each of the power levels The power level adjustment data consisting of the APC voltage value is attached to the module and shipped. Characterized in that that.
(2): The power level adjustment step is characterized in that the adjustment is performed using an inspection connector formed on the module and connected to an antenna end of a mobile phone.
[0025]
(3) : In the wireless communication device of (1), the APC voltage value at each power level is recorded and supplied as a set with the module.
[0026]
(4) : In the wireless communication device according to (1), the adjustment data of each component is recorded in a three-dimensional barcode and supplied as an attachment to the module.
[0027]
(5) : In the wireless communication device of (4) , the adjustment data of each component is approximated and supplied.
[0028]
(Function)
In the wireless communication apparatus, at least components including a power amplifier, an APC circuit, a detection circuit, a directional coupler (coupler), a low-pass filter, an antenna switch, a diplexer, and a SAW filter that constitute a front end unit are modularized. .
[0029]
In the wireless communication device, the APC voltage value at each power level is recorded and supplied as a set with the module, or the adjustment data of each component is recorded in a three-dimensional barcode and attached to the module. Or supply the adjustment data of each component in an approximate expression.
[0030]
In this way, the parts including the PA of the front end portion of the wireless communication device are modularized, and the module supplier ships the output adjusted in the module state. The output adjustment time can be eliminated. In addition, the main board design time, inspection time, and cost can be reduced.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, an example of a mobile phone will be described.
[0032]
§1: Description of mobile phone FIG. 1 shows a block diagram of a mobile phone, and FIG. 2 shows a partially enlarged view of the block diagram of FIG. This mobile phone is an example applied to a GSM / DCS dual mode mobile phone.
[0033]
As shown in FIGS. 1 and 2, the mobile phone includes a diplexer 2, an antenna switch 3, an LPF 4, a coupler (Coupler: directional coupler) 5, a PA 8, an APC circuit (a circuit including a comparator 7 and a resistor R), Detection circuit (circuit including detection diode 6), VCO 9, LPF 14, SAW filter 11, LNA 12, band pass filter 13, RFIC (integrated circuit of high frequency section), converter 21, DSP 22, memory 23, IF-SAW filter (intermediate frequency) Band SAW filter), LC filter, PLL circuit, VCO and other components are provided.
[0034]
This mobile phone adopts GSM / DCS dual mode. Among the above parts, the part including the coupler 5, PA8, VCO14, the part including SAW filter 11, LNA12, bandpass filter 13, etc. Portions and the like are duplicated to form a dual mode circuit configuration.
[0035]
Further, the converter 21 is provided with a DAC 27, an ADC 28, and the like, and the DSP 22 is provided with a processor 25 and the like. Further, the RFIC is provided with components necessary for a high-frequency unit such as an IF-VCO (intermediate frequency band VCO), a frequency divider, and a phase detector.
[0036]
The memory 23 is used as a baseband memory, and stores programs (baseband programs) used by the processor 25 of the DSP 22, various data (setting data for the DAC 27), and the like.
[0037]
Among the above components, at least the front-end PA8 for high-frequency power amplification, the APC circuit for controlling the gain of the PA8, the detection circuit for detecting the output of the PA8, and the signal amplified by the PA8 are demultiplexed. A coupler (directional coupler) 5, an LPF 4 that removes a high frequency component of the signal output from the coupler 5, an antenna switch 3 that switches between transmission and reception, a diplexer 2, and a SAW filter 11 that limits the band of the received signal. Parts are modularized. The modularization may be a single module including the VCO 9 and the LPF 14 in addition to the components.
[0038]
In the circuit having the above-described configuration, the power level control calls a digital value corresponding to the APC voltage required by the processor 25 of the DSP 22 from the memory 23, sends it to the DAC 27, and sets it as a DAC value (digital data). The DAC 27 converts the DAC value into an analog DC voltage and sends it to the comparator 7 as an APC voltage.
[0039]
The comparator 7 of the APC circuit compares the APC voltage with the detection voltage of the output of PA8 (output voltage of the detection diode 6), sends an appropriate control voltage to PA8, and obtains the desired output voltage from PA8. Thus, any desired output voltage can be obtained by changing the DAC value.
[0040]
§2: Explanation of adjustment procedure, etc. The power level of the mobile phone is adjusted as follows. First, after a module supplier (for example, a parts manufacturer) modularizes the parts constituting the front end unit, the power level is adjusted, and the adjusted modules are shipped. The manufacturer that performs the final assembly purchases the adjusted module and performs the final assembly. At this time, the power level adjustment can be eliminated from the manufacturing process. Therefore, it is possible to improve workability and reduce costs.
[0041]
By the way, when the module supplier performs the adjustment, an inspection connector 20 is provided at the end of the antenna 1 of the cellular phone and is connected to the power meter via a cable. Then, the DSP 22 is set to be in a transmission state from an external PC (personal computer).
[0042]
In this state, the processor 25 of the DSP 22 reads out data of a desired power level from the memory 23 and sets it in the DAC 27. The DAC 27 converts the set DAC value into a DC voltage (APC voltage) at the APC terminal (DAC output) and sends it to the comparator 7 of the APC circuit.
[0043]
The comparator 7 compares the detection voltage of the output power of the PA 8 (output voltage of the detection diode 6) with the APC voltage, and controls the output of the PA 8 according to the comparison result. At this time, a desired standard value is obtained by measuring the desired output power at the end of the antenna 1.
[0044]
In the case of GSM900, since 15 levels of adjustment are required, the same procedure is repeated 15 times. The DCS 1800 requires similar work. The problems that require adjustment are summarized as follows: (1). Part variation between PA8 and SAW filter 11, (2). Characteristic change due to load fluctuation after connection of each part, (3). There are three variations in the conversion voltage of the DAC 27.
[0045]
In order to solve the problems (1) and (2) above, at least modules from PA8 to SAW filter 11 are modularized (see FIG. 2) to absorb characteristic variations due to component variations and load fluctuations after connecting each component. Make a module and adjust the module state. Further, in order to solve the problem (3), the APC voltage value adjusted in the module state is stored in, for example, a recording medium and supplied to the final assembly operator of the mobile phone.
[0046]
Since the analog output of the DAC 27 with respect to the set digital value is expressed by a linear function, the APC voltage accurately adjusted from the APC voltage is measured by measuring two conversion values of the conversion from the digital value to the analog value. Voltage values can be converted to digital values.
[0047]
The module to be shipped is attached with a recording medium that stores the adjusted data. The data in that case is stored in a bar code, flexible disk (floppy disk), server hard disk device, etc. At any time, the data compared with the module number can be read out.
[0048]
§3: Description of experimental example An example of experimental data is shown in FIG. In FIG. 3, the horizontal axis indicates the output voltage V _{ap c} of the APC terminal, and the vertical axis indicates the antenna output P _out . In this case, the unit of the output voltage V _apc of the APC terminal is V. Further, the antenna output P _out is expressed in P _ower, the unit is (dBm). Furthermore, in PA8, the frequency 900MH _Z, input (P _in = 6dBm).
[0049]
In this experiment, PA8, coupler 5, LPF4, antenna switch 3, diplexer 2, SAW filter 11, detector circuit (a circuit including detector diode 6), APC circuit (comparator 7, R) are used in order to eliminate variations among components. As a result of making a module integrated with the circuit including the circuit and adjusting the output voltage, a characteristic curve shown in FIG. 3 was obtained. Adjustment took about 1 minute. The antenna output and the output voltage V _apc of the APC terminal were converted into a three-dimensional barcode and attached to the upper part of the module.
[0050]
Incidentally, according to the characteristics of Figure 3, in the frequency 900MH _Z, when the _{P out (dBm) = 5.0,} V apc (V) = 1.265, when the _{P out (dBm) = 7.0,} V _{When apc} (V) = 1.285, P _out (dBm) = 9.0, V _apc (V) = _1.300 , P _out (dBm) = 11.0, V _apc (V) = 1 .324, P _out (dBm) = 13.0, V _apc (V) = 1.345, P _out (dBm) = 21.0, V _apc (V) = 1.474, P _out ( dBm) = 25.0, V _apc (V) = 1.599, P _out (dBm) = 31.0, V _apc (V) = 2.063, P _out (dBm) = 33.0 At this time, V _apc (V) = 2.689.
[0051]
Further, as a result of incorporating this module into a GSM cellular phone, converting the recorded APC voltage into a digital value, and incorporating it into the memory 23, the required output power can be obtained without adjusting the output in the cellular phone. It was.
[0052]
As a method of incorporating the APC voltage to baseband software stored in memory 23, replacing the antenna output (output power) P _out, the relationship of APC voltage value V _apc (characteristic curve shown in FIG. 3) to the approximate expression calculation Thus, the APC voltage could be obtained.
[0053]
Similarly, for the frequency, the output is adjusted in the same manner, the APC voltage is recorded, the module is incorporated into the GSM mobile phone, the recorded APC voltage is converted into a digital value, and the result is written in the memory 23. The need is gone. Similarly, an approximate expression could be substituted.
[0054]
【The invention's effect】
As described above, the present invention has the following effects.
[0055]
In the wireless communication apparatus, at least components including a power amplifier, an APC circuit, a detection circuit, a directional coupler (coupler), a low-pass filter, an antenna switch, a diplexer, and a SAW filter that constitute the front end unit are modularized.
[0056]
Also, in the wireless communication device, the APC voltage value at each power level is recorded and supplied as a set with the module, or the adjustment data of each component is recorded in a three-dimensional barcode and attached to the module. Or supply the adjustment data of each component in an approximate expression.
[0057]
In this way, the parts including the power amplifier of the front end part of the wireless communication device are modularized, and the module supplier ships the output adjusted in the state of the module, so in the final assembly operator of the mobile phone, Power amplifier output adjustment time can be eliminated. In addition, the main board design time, inspection time, and cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram of a mobile phone according to an embodiment of the present invention.
FIG. 2 is a partially enlarged view of the block diagram of FIG. 1;
FIG. 3 is an example of experimental data in the embodiment of the present invention.
[Explanation of symbols]
1 Antenna 2 Diplexer 3 Antenna switch 4 LPF
5 Coupler 6 Detection Diode 7 Comparator 8 PA (Power Amplifier)
9 VCO (Voltage Controlled Oscillator)
11 SAW filter 12 LNA (low noise amplifier)
13 BPF (band pass filter)
14 LPF (low pass filter)
20 Inspection Connector 21 Converter 22 DSP (Digital Signal Processor)
23 memory (baseband memory)
25 Processor 27 DAC (digital / analog converter)
28 ADC (Analog / Digital Converter)
PC personal computer

Claims (5)

In a wireless communication device,
At least a power amplifier for power amplification that constitutes the front end unit, an APC circuit that controls the power amplifier, a detection circuit that detects the output of the power amplifier, and a directionality that demultiplexes the signal amplified by the power amplifier This is a module in which components including a coupler, a low-pass filter that removes the high-frequency component of the signal output from the directional coupler, an antenna switch that switches between transmission and reception, a diplexer, and a SAW filter that limits the received signal are modularized. And
The module includes a power level adjustment step of obtaining characteristics of the antenna output in the module state and the APC voltage value that is the output voltage of the APC terminal, and the power level adjustment including the APC voltage value at each power level. A wireless communication apparatus, wherein data is attached to the module before shipment . 2. The wireless communication apparatus according to claim 1, wherein the power level adjustment step performs adjustment using an inspection connector formed in the module and connected to an antenna end of a mobile phone. The wireless communication apparatus according to claim 1, wherein an APC voltage value at each power level is recorded and supplied as a set with the module. 2. The wireless communication apparatus according to claim 1, wherein the adjustment data of each component is recorded in a three-dimensional bar code and supplied as an attachment to the module. 5. The wireless communication apparatus according to claim 4, wherein the adjustment data of each component is supplied after being approximated.

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