JP2003018027A - Transmission power controller and wireless apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission power controller than can detect transmission power over a wider range of dynamic range. SOLUTION: A detection section 216 detects a transmission power quantity of a wireless signal via path 1. A feedback path changeover control section 219 selects a path 2, when the power is a threshold value or below. The detection section 216 detects the amplified transmission power via the path 2. Thus, the transmission power controller can ensure a wider detection range of the dynamic range than the performance of the detection section 216.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control device and a wireless device for a wireless device required to have a wide power control range.

[0002]

2. Description of the Related Art A commonly used radio transmitter, especially a digital mobile phone system, has a function of controlling transmission power of a base station according to a distance between a base station and a mobile station. As a conventional technique, for example, Japanese Patent Laid-Open No. 9-277
There is a transmission power control method as described in JP-A-23. In this conventional technique, a part of the transmission power is taken out for power control, and the output voltage obtained through the output detection unit is converted into A / D.
The data is read into the microcomputer via the converter and compared with the preset reference value. Based on the comparison result, the table data stored in the ROM is used to call the data with the specified transmission power, and the variable gain amplification is performed via the D / A converter. Change the control voltage of the part. As a result, the control error can be reduced while minimizing the circuit scale between the output detection unit of the transmission power and the power control unit, and stable transmission power control is possible.

[0003]

In a wireless communication system including a base station and a mobile station such as a CDMA wireless transmission system, each base station is required to establish a stable communication state and maintain communication quality. By controlling the transmission power so as to optimize the mutual cell range, the terminals accommodated in each cell are moved to the control of neighboring base stations. This transmission power control requires the following three controls. Control to gradually increase the power from the transmission stopped state to the maximum power at the speed at which the terminal can handoff at the time of transmission start, such as when a new cell is placed or when cell operation is temporarily stopped due to maintenance etc. Control is hereinafter referred to as Blooming), and at the start of this transmission, the power is gradually reduced from the maximum power to a transmission stopped state at a speed at which the terminal can handoff (hereinafter, this control is referred to as Wilting). At the time of communication, a control for adjusting the transmission power in order to correct the shift between the upstream / downstream handoff boundaries (hereinafter, this control is referred to as blessing) is required. In order to sufficiently fulfill these control functions, a transmission power control device having a wide dynamic range capable of controlling the transmission power from the transmission stopped state to the maximum transmission power state is required.

In the prior art, the control error is reduced and the stable transmission power control is enabled while minimizing the circuit scale of the transmission power output detection unit and the power control unit. The dynamic range is limited within the dynamic range held by the detection unit, which is disadvantageous in realizing transmission power control over a wide dynamic range.

SUMMARY OF THE INVENTION An object of the present invention is to realize a transmission power control device and a wireless device which can detect the transmission power over a wider dynamic range in order to solve the above problems.

[0006]

To solve the above problems, the present invention provides a transmission power control apparatus for controlling the power of a transmission signal, in which the transmission signal is fed back to detect the amount of power of the transmission signal. A detection unit and a gain adjustment unit that adjusts the gain of the transmission signal according to the amount of power detected by the detection unit, wherein the detection unit has a plurality of detection sensitivities in the detection of the amount of power, In the transmission power control device that controls the power of the transmission signal that selects the detection sensitivity according to the detected power amount, the power amount of the transmission signal is detected by feeding back the transmission signal and detecting the voltage value of the transmission signal. And a gain adjustment unit that adjusts the gain of the transmission signal according to the amount of power detected by the detection unit. The detection unit includes a detection range of the amount of power for the transmission signal. Comprising a plurality of different paths means. Since it has multiple detection sensitivities with different detection sensitivities of electric energy,
A wide dynamic range detection range can be secured.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a radio base station in mobile communication. In FIG. 1, the wireless base station is a wireless device, and mainly includes a control unit 101, a wireless transmitter 102, a wireless receiver 103, a duplexer 104, and an antenna 105. The radio transmitter 102 transmits a downlink radio signal to the terminal. The wireless receiver 103 receives an uplink signal from the terminal. The duplexer 104 is the wireless transmitter 10
2 and the signal of the radio receiver 103 are shared by one antenna. The antenna 105 transmits and receives wireless signals to and from the terminal. The control unit 101 uses the wireless transmitter 1
02 and the wireless receiver 103, and also controls the interface with the wired network.

Next, the configuration of the radio transmitter 101 of the base station will be described with reference to the block diagram shown in FIG. In the wireless transmitter of the wireless device in this embodiment, the power of the transmission signal is adjusted by feeding back the transmission signal, detecting the power of the transmission signal, and adjusting the amplification factor of the transmission signal according to the power value. When determining the power value of the transmission signal,
It is divided into paths, and in path 1, the voltage value of the transmission signal is obtained as it is, and in path 2, the transmission signal is amplified by a predetermined amplification factor and then the voltage value is obtained. Calculate the output power value of the transmission signal of
The power of the transmission signal is adjusted from this output power value. By dividing the path, the range of power values that can be detected (dynamic range) can be widened.

In FIG. 2, the radio transmitter 102 includes a digital signal processing unit 201 for digitally processing a transmission signal.
, A D / A converter 205 for converting a digital signal into an analog signal, and a quadrature modulator 2 for quadrature modulating the analog signal.
06, a variable gain unit 207 that adjusts the gain of the transmission signal according to the variable gain amount determined by the control signal from the digital signal processing unit 201, a power amplification unit 208 that performs power amplification, and the transmission to the antenna 105 and the return path. A directional coupler 209 that divides a signal, switch circuit sections 211 and 215 for switching two paths, a power amplification section 214 provided on the path 2, a detection section 216 that detects a voltage value of a transmission signal, and a detection section. And an A / D converter 217 for converting the converted voltage value (analog value) into a digital value.

The digital signal processing section 201 includes a detecting section 2
A power table 218 in which the characteristics of the output power value with respect to the voltage value detected in 16 are stored, a feedback path switching control unit 219 that controls switching of the two-stage switch circuit units 211 and 215, and amplification in the power amplification unit 214. Table offset 220 that stores the same attenuation value as the gain amount, BB signal unit 202 that is connected to control unit 101 and generates a transmission signal, and output power of BB signal unit 202 and detected power are compared. The output power comparing unit 222 and the variable gain amount calculating unit 223 that calculates the gain amount of the transmission signal from the comparison result.

In FIG. 2, the digital signal processing unit 20
The BB signal unit 202 in 1 generates the I signal 203 and the Q signal 204 which are two orthogonal signals with respect to the transmission signal transmitted from the control unit 101 of the base station shown in FIG. The D / A converter 205 converts these two signals into analog signals, and the quadrature modulator 206 quadrature modulates these two signals. In the next-stage variable gain unit 207, the gain is adjusted according to the variable gain amount determined by the control signal from the digital signal processing unit 201, and the quadrature-modulated transmission signal is amplified with the adjusted gain. The transmission signal is power-amplified by the power amplification unit 208, passes through the directional coupler 209, and is transmitted from the antenna 105 at the target power. In this embodiment, in order to control the power of the transmission signal, the transmission signal is fed back by the directional coupler 209. The transmitted transmission signal is returned to the switch circuit unit 211 for switching the detection path.
The detection unit 21 via the route 1 or the route 2 via the route 215.
The voltage value of the transmission signal is detected at 6, and the A / D converter 2
The voltage value detected at 17 is converted into a digital value.
Next, the power table 2 of the digital signal processing unit 201
At 18, the detected voltage value is converted into the output power value of the corresponding transmission signal.

FIG. 7 shows a specific example of table contents in the power table 218. In FIG. 7, the power table 2
The output power value 18 corresponding to the detected voltage value of the transmission signal is registered in advance. This output power value indicates the actual transmission power value from the antenna terminal 105. The power table 218 outputs the power value of the transmission signal corresponding to the voltage value detected by the detection unit 216.

Next, the operation of detecting the power of the returned transmission signal and controlling the power will be described. FIG. 4 shows a flowchart of the control operation of the return path switching control unit 219 shown in FIG. Further, FIG. 6 shows characteristics of transmission power and voltage.

The route of the returned transmission signal is switched by the feedback route switching controller 219. The feedback path switching control unit 219 switches the path according to the detected voltage value, as shown in FIG. Detector 216
Between the two-stage switch circuit parts 211 and 215 before the
The path 1 and the path 2 are provided, and the path is selected by switching the switch of the switch circuit unit. The dynamic range of the detectable signal power value is different between the path 1 and the path 2. Since the path 2 is provided with the power amplifier 214, smaller signal power can be detected. In FIG. 6, the feedback path switching control unit 219 selects the path 2 when the detected voltage value is within the dynamic range of the path 2, and selects the path 1 when a larger voltage value is detected. . Both dynamic ranges are provided with a portion overlapping with a margin in order to prevent frequent switching of routes. The voltage value on the path 2 corresponding to the minimum power value in the portion where both dynamic ranges overlap (hysteresis area) is the threshold value 2, and the voltage value on the path 1 corresponding to the maximum power value is the threshold value 1. Since the transmission power changes every moment, the detection unit 216 always detects the voltage value. The feedback path switching control unit 219 switches to the path 1 when the detected voltage value is larger than the threshold value 2 while selecting the path 2. When the voltage value detected while the path 1 is selected becomes smaller than the threshold value 1, the path 2 is switched to be selected. Further, when the path 2 is selected, in order to attenuate the power amplified by the power amplifier 214, the attenuation corresponding to the power amplified by the table offset 220 is added. For example, when the power amplification unit 214 is performing power amplification of 30 dB, the table offset 22
At 0, −30 dB is added by the adder 221.

Next, the path switching operation will be described with reference to the flowchart shown in FIG.

In FIG. 4, the voltage of the transmission signal is detected by the detector 2.
16 and is converted into a power value in the power table 218 (S401). Return path switching control unit 219
Determines the current detection path (S402), and if it is path 2, determines whether the output voltage is larger or smaller than the threshold 2 (S403). If the output voltage is larger than the threshold value 2, the path is switched to the path 1 (S404) and the table offset is set to OF.
Set to F (S405). When switched to the path 1, the transmission signal is input to the detection unit 216 without being subjected to the gain operation.

If the output voltage is less than or equal to the threshold value 2, the path 2 is maintained (S406) and the table offset is turned on (S407). By turning on the table offset, the amount of amplification in the power amplification section 214 is attenuated, and when it is off, it is not attenuated. In S402,
If the current detection path is the path 1, it is determined whether the output voltage is larger or smaller than the threshold value 1 (S408). If the output voltage is equal to or higher than the threshold value 1, the path 1 is maintained (S40
9), turn off the table offset (S41
0). If the output voltage is smaller than the threshold value 1, the path 2 is switched to (S411) and the table offset is turned on (S412). When the path 2 is selected, the transmission signal is amplified by the power amplification unit 214 to a gain within the dynamic range of the detection unit 216, and then input to the detection unit 216.

By the processing as shown in FIG. 4, the voltage level of the transmission signal can always be kept within the dynamic range of the detecting section 216, and the dynamic range of the power that can be detected is widened by providing two paths. be able to. Further, in the above flowchart, the voltage value is used as the threshold value, but the power value may be used as the threshold value.

The transmission power level obtained as a result is compared with the reference power value received from the BB signal unit 202 in the output power comparator 222 to obtain a difference, and this difference becomes the gain control amount D1. This calculated gain control amount D1
Is input to the variable gain amount calculation unit 223 and compared with the gain control amount D0 already set to obtain the target transmission power. When a difference (D1−D0) is generated in the comparison result, the gain control amount of the variable gain unit 207 is changed.
The control voltage value of the variable gain unit 207 is calculated. In the variable gain unit 207, a correction value corresponding to the difference in gain control amount is defined in advance by a function, a new gain control amount D2 is calculated from the existing gain control amount D0 according to this correction value, and the control voltage value is Desired. The calculated control voltage value is transmitted via the D / A converter 224 to the variable gain unit 207.
Is input to the variable gain unit 207 and becomes a value for controlling the gain amount in the variable gain unit 207. For example, when the detected output power value is larger than the target power value, the new gain control amount D2 is set so that the attenuation amount is larger than the existing gain control amount D0. Transmission power control is performed by these series of controls.

As described above, according to the present embodiment, it is possible to detect the transmission power with a wider dynamic range.

Next, a second embodiment will be described. Second
A block diagram of FIG. 3 shows the configuration of the embodiment.
The difference between the present embodiment and the first embodiment is that after the directional coupler 309 partially extracts the power of the transmission signal,
Up to the digital signal processing unit 301, the output detection system is independent of the two systems. Since the switching of the route by the detection route switching control unit 319 in the first embodiment is not performed by switching, there is an advantage that the work of controlling the detection circuit unit can be omitted. Accordingly, the hysteresis area 605 of the power table data in FIG. 6 can be reduced, and as a result, a wider dynamic range can be secured as compared with the first embodiment. The operation of this embodiment will be described with reference to the block diagram shown in FIG.

In FIG. 3, the digital signal processing section 30
The BB signal unit 302 in 1 generates the I signal 303 and the Q signal 304 which are two orthogonal signals with respect to the transmission signal transmitted from the control unit 101 of the base station shown in FIG. The D / A converter 305 converts the two signals into analog signals, and the quadrature modulator 306 quadrature modulates the signals. The variable gain unit 307 in the next stage adjusts the gain according to the variable gain amount determined by the control signal from the digital signal processing unit 301, and amplifies the quadrature-modulated transmission signal with the adjusted gain. The transmission signal is the power amplification unit 3
The signal is amplified in 08, passes through the directional coupler 309, and is transmitted from the antenna terminal 105 at the target power. In this embodiment, since the power of the transmission signal is controlled, the directional coupler 30 is used.
A part of the electric power of the transmission signal is extracted by 9 and then fed back.
The returned transmission signal is distributed to the path 1 and the path 2 by the distribution unit 311. In the path 1, the transmission signal is input to the detection unit 314 without being subjected to the gain operation and the voltage is detected,
The voltage detected by the A / D converter 315 is converted into a digital value. The voltage signal converted into the digital signal is input to the digital signal processing unit 301. In the power table 316 of the digital signal processing unit 301, the detected voltage value is converted into the output power value of the corresponding transmission signal. In the power table 316, the output power value corresponding to the detected voltage value of the transmission signal is registered in advance, as in the first embodiment. The power table 316 outputs the power value of the transmission signal corresponding to the voltage value detected by the detection unit 314.

On the path 2, the transmission signal is limited by the limit circuit section 317. By setting the limit level of the limit circuit unit 317 to the lower limit of the dynamic range of the detection unit 314 of the path 1 (the same as the threshold value 1 in the first embodiment), the power level of the detection signal has the detection unit 314. Path 2 is activated only if it is below the lower limit of the dynamic range. When the voltage value of the detection signal is greater than or equal to the threshold value 1, the detection signal is limited to the limit circuit unit 317.
Route 2 does not work because it cannot pass
Only will work. The transmission signal that has passed through the limiter circuit unit 317 is amplified by the power amplification unit 318 with a predetermined amplification factor. A voltage value of the amplified transmission signal is detected by the detection unit 319 and is converted into a digital signal by the A / D converter 320. The voltage signal converted into the digital signal is input to the digital signal processing unit 301. In the power table 321 of the digital signal processing unit 301, the detected voltage value is converted into the output power value of the corresponding transmission signal. In the power table 321, the output power value corresponding to the detected voltage value of the transmission signal, to which the power amplification value is added, is registered in advance. In this case, since the value obtained by attenuating the amplified power amount is already registered, the process of attenuating the power by the table offset 220 as described in the first embodiment is unnecessary.

In FIG. 3, the dynamic range of the detectable voltage value is different between the path 1 and the path 2. Since the path 2 is provided with the power amplifier 318, a smaller voltage can be detected. As shown in FIG. 6, the table switching unit 322 selects the path 2 when the converted power value is within the dynamic range of the path 2, and selects the path 1 when the power larger than that is detected. select. Both dynamic ranges are provided with a portion overlapping with a margin in order to prevent frequent switching of routes. Hereinafter, the minimum value of the power value in the portion where the two dynamic ranges overlap (hysteresis area) will be referred to as threshold value 2 and the maximum value of the power value will be referred to as threshold value 1. Since the transmission power changes every moment, the detection units 314 and 319 always detect the power value. The table switching unit 322 selects the power value from the power table of the route 1 when the detected power value is larger than the threshold value 2.
Further, when the detected power value becomes smaller than the threshold value 1, the power value from the power table 321 of the route 2 is selected.

Next, the table switching processing in the table switching unit 322 will be described with reference to the flowchart shown in FIG.

In FIG. 5, the voltage of the transmission signal is detected by the detector 3.
14 and 319, and converted into electric power values in the electric power tables 316 and 321 (S501). Table switching unit 32 in digital signal processing unit 301
2 determines the currently selected power table (route) (S502), and if it is route 2, determines whether the output power is larger or smaller than the threshold 2 (S503). If the output power is larger than the threshold value 2, the output value of the power table 316 of the route 1 is selected (S504). If the output voltage is less than or equal to the threshold value 2 value, the output value of the power table 321 of the path 2 is selected (S505). If the current detection path is the path 1 in S502, it is determined whether the output voltage is larger or smaller than the threshold value 1 (S506). If the output voltage is equal to or higher than the threshold value 1, the output value of the power table 316 of the path 1 is selected (S507). If the output voltage is smaller than the threshold value 1, the output value of the power table 321 of the path 2 is selected (S508).

By the process as shown in FIG. 5, two dynamic paths are provided and processed at the same time, so that the dynamic range of detectable electric power can be widened.

The transmission power level obtained as a result is compared with the reference power value received from the BB signal section 302 in the output power comparator 323, and the difference is obtained as the gain control amount. The obtained gain control amount is input to the variable gain amount calculation section 324 and compared with the gain control amount set to obtain the target transmission power. If there is a difference in the comparison result, the gain control amount of the variable gain unit 307 is varied to calculate the control voltage value of the variable gain unit 307. The calculated control voltage value is input to the variable gain unit 307 via the D / A converter 325 and becomes a value for controlling the variable gain amount in the variable gain unit 307. Transmission power control is performed by this series of controls.

The effects of the second embodiment are as follows. One is that in the output detection circuit, by setting the path configuration for varying (amplifying) the magnitude of the signal distributed from the main signal system, a wider dynamic range than the performance possessed by the detection unit installed in the subsequent stage can be achieved. The detection range can be secured. On the other hand, by providing the paths independently, it is not necessary to switch the switches, and the stability of circuit control can be secured.

Next, a third embodiment will be described. A block diagram in the third embodiment is shown in FIG. Third
The embodiment will describe a configuration in which three paths are provided in the first embodiment. In FIG.
Elements having the same functions as those of the blocks shown in FIG. 2 are designated by the same reference numerals.

In FIG. 8, power amplifiers 814 and 816 are provided.
And a different amplification factor, and thus a different dynamic range of the voltage detected by each path. For example,
The amplification factor of the power amplification unit 814 is set to 30 dB, and the amplification factor of the power amplification unit 816 is set to 45 dB. The path of the returned transmission signal is switched by the feedback path switching control unit 821. The feedback path switching control unit 821, according to the detected voltage value, the switch circuit units 811, 817 in the previous stage.
The route is selected by switching the switch. The feedback path switching control unit 821 selects the path 3 when the detected voltage value is within the dynamic range of the path 3, and selects the path 2 when within the dynamic range of the path 2, and the path 1 If it is within the dynamic range of, route 1 is selected. The dynamic range of each route is set so that the route does not switch frequently.
Similar to the first embodiment, a portion overlapping with the margin may be provided. When the route 2 or the route 3 is selected, the power amplification unit 814 or 816 is selected.
In order to attenuate the power-amplified amount in step A, the attenuation amount corresponding to the power amplified in table offset 820 is added. For example, when the path 2 is selected and the power amplification unit 814 is performing power amplification of 30 dB, the table offset 822 is −30 dB.
Are added by the adder 823. Further, when the path 3 is selected and the power amplification section 816 is performing the power amplification of 45 dB, −45 dB is added by the adder 823 at the table offset 822. Other operations are similar to those of the first embodiment.

According to the present embodiment, the route can be made into three systems, and the detectable power range can be made wider.

Next, a fourth embodiment will be described with reference to the block diagram shown in FIG. In the fourth embodiment,
A configuration in the case where three routes are provided in the second embodiment will be described. In FIG. 9, elements having the same functions as those of the blocks shown in FIG. 3 are designated by the same reference numerals.

In FIG. 9, power amplifiers 318 and 924 are provided.
And a different amplification factor, and thus a different dynamic range of the voltage detected by each path. For example,
The amplification factor of the power amplification unit 918 is set to 30 dB, and the amplification factor of the power amplification unit 924 is set to 45 dB. The returned transmission signal is distributed to the path 1, the path 2, and the path 3 by the distributor 911. On the path 3, the transmission signal is transmitted to the limit circuit unit 9
The limiter is applied at 23. By setting the limit level of the limit circuit unit 923 to the lower limit of the dynamic range of the detection unit 319 of the route 2, the route 3 operates only when the power level of the detection signal is less than or equal to the lower limit of the dynamic range of the detection unit 319. To do. Limiter circuit unit 923
The transmission signal that has passed through is amplified by the power amplification unit 924 at a predetermined amplification factor. A voltage value of the amplified transmission signal is detected by the detection unit 925, and is converted into a digital signal by the A / D converter 926. The voltage signal converted into the digital signal is input to the digital signal processing unit 901. In the power table 927 of the digital signal processing unit 901, the detected voltage value is converted into the output power value of the corresponding transmission signal. Power table 927
The output power value corresponding to the detected voltage value of the transmission signal, to which the power amplification value is added, is registered in advance. The table switching unit 928 determines that the converted power value is the value of the route 3
If it is within the dynamic range of, the path 3 is selected, if it is within the dynamic range of the path 2, path 2 is selected, and if larger power is detected, path 1 is selected. Other operations are the same as those in the second embodiment.

According to the present embodiment, the route can be made into three systems, and the detectable power range can be made wider. Further, by providing the paths independently, it is not necessary to switch the switches, and the stability of circuit control can be secured.

Based on the above embodiment, there may be four or more routes. As shown in each of the above-described embodiments, the power range to be detected can be widened by receiving a plurality of paths.

[0038]

According to the present invention, it is possible to realize a transmission power control device capable of detecting transmission power over a wider dynamic range.

[Brief description of drawings]

FIG. 1 is a block diagram of a wireless base station

FIG. 2 is a block configuration diagram of a transmission power control circuit according to the first embodiment of the present invention.

FIG. 3 is a block configuration diagram of a transmission power control circuit according to a second embodiment of the present invention.

FIG. 4 is a flowchart of an operation according to the first embodiment of the present invention.

FIG. 5 is a flowchart of an operation according to the second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing the characteristics of the detected power of the detection unit and the output voltage when the power detection circuit is switched.

FIG. 7 is an explanatory diagram of a power table.

FIG. 8 is a block configuration diagram of a transmission power control circuit according to a third embodiment of the present invention.

FIG. 9 is a block configuration diagram of a transmission power control circuit according to a fourth embodiment of the present invention.

[Explanation of symbols]

101: control unit 102: wireless transmitter 103: wireless receiver 104: shared unit 105: antennas 201, 301, 901: digital signal processing unit 202, 302: BB signal unit 203, 303: BB signal (I) 204, 304 : BB signal (Q) 205, 224, 305, 325: D / A converters 206, 306: Quadrature modulation units 207, 307: Variable gain units 208, 308: Power amplification units 209, 309: Directional couplers 211, 215 , 811, 817: switch circuit sections 212, 312, 812: path 1 213, 313, 813: path 2 815, 914: path 3 214, 318, 814, 816, 924: power amplification sections 216, 314, 319, 925 : Detectors 217, 315, 320, 926: A / D converters 218, 316, 321, 820, 9 7,922,9
27: power tables 219, 821: feedback path switching control units 220, 822: table offsets 221, 823: table offset addition units 222, 323: output power comparison units 223, 324: variable gain amount calculation units 317, 923: limit circuits Units 322 and 928: Table switching unit 601: Detection power-output voltage characteristic of detection unit alone 602: Dynamic range of detection unit alone 603: Dynamic range of path 2 604: Dynamic range of path 1 605: Path 1 and path 2 Hysteresis area when switching.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5J100 JA01 KA05 LA09 LA10 LA11                       QA01 SA01                 5K060 BB07 CC04 CC11 DD04 HH05                       HH06 HH31 HH32 HH39 JJ23                       KK01 LL01 LL14 LL24 PP05                 5K067 AA21 BB04 EE02 EE10 GG08                       GG09

Claims (5)

[Claims] 1. A transmission power control device for controlling the power of a transmission signal, wherein a detector for feeding back the transmission signal to detect the amount of power of the transmission signal, and the transmission according to the amount of power detected by the detector. A gain adjusting unit that adjusts the gain of a signal, wherein the detection unit has a plurality of detection sensitivities in the detection of the power amount, and selects the detection sensitivity according to the detected power amount. Transmission power control device. 2. The transmission power control device according to claim 1, wherein the detection section outputs a path of the transmission signal, a path for amplifying the power of the transmission signal, and a transmission signal from the two paths. And a switching unit that switches between the two routes according to the amount of power detected by the detection unit. 3. The transmission power control device according to claim 1, wherein the detection unit detects the power amount of the transmission signal and an amplification unit that power-amplifies the transmission signal to detect the power amount. A transmission power control device comprising: a detection unit; and a selection unit that selects one of the power amounts according to the power amounts detected by the detection unit and the amplification detection unit. 4. The transmission power control device according to claim 1, wherein the plurality of detection sensitivities have portions where detection ranges of the power amounts partially overlap. 5. A radio apparatus comprising a transmitter for transmitting a radio signal and a receiver for receiving the radio signal, wherein the transmitter feeds back the radio signal to be transmitted and detects the transmission power amount of the radio signal. First detecting means, a second detecting means for amplifying the wireless signal to be transmitted to detect the amount of transmission power of the wireless signal, and an amount of transmission power detected by the first and second detecting means. A radio having a control means for selecting any one of the transmission power amounts according to a predetermined rule, and a gain adjustment means for performing gain adjustment of the radio signal to be transmitted according to the selected transmission power amount. apparatus.