WO2008012883A1

WO2008012883A1 - Wireless communication device

Info

Publication number: WO2008012883A1
Application number: PCT/JP2006/314803
Authority: WO
Inventors: Katsuhiro Sakai; Shinji Ueda; Takashi Enoki
Original assignee: Panasonic Corporation
Priority date: 2006-07-26
Filing date: 2006-07-26
Publication date: 2008-01-31

Abstract

A wireless communication device having a simple circuit construction, free of deterioration of distortion due to reduction of the power supply voltage, and having a Doherty amplifier. When the voltage of a first cell (104) is normal, power supply voltage reduction detecting means (107) does not send a signal indicating the voltage reduction to power supply voltage supply path changing means (108). With this, the power supply voltage supply path changing mean (108) changes the path to a first path bypassing constant power supply voltage supplying means (106) so as to supply the voltage of the first cell (104) to a carrier amplifier (102). When the voltage of the first cell (104) lowers below a voltage threshold, the power supply voltage reduction detecting means (107) sends the signal indicating the voltage reduction to the power supply voltage supply path changing mean (108). With this, the power supply voltage supply path changing means (108) changes the path of the first cell (104) to a second one, and supplies power of a constant voltage to the carrier amplifier (102) by using the constant power supply voltage supplying means (106).

Description

Specification

Wireless communication device

Technical field

TECHNICAL FIELD [0001] The present invention relates to a wireless communication apparatus including a Doherty amplifier using a battery as a power source.

Background art

In recent years, multi-carrier schemes that are resistant to multipath and fading are attracting attention as communication schemes capable of realizing high-speed wireless transmission. In such a multi-carrier scheme, transmission signals superimposed on a plurality of carriers (carrier waves) are added on the time axis, resulting in high peak power in the multi-carrier signal. Therefore, a Doherty amplifier is known as a power amplifier that can amplify even a multicarrier signal having such a high peak power with high efficiency (see, for example, Non-Patent Document 1).

FIG. 1 is a schematic configuration diagram of a commonly known Dono / Tee amplifier. As shown in FIG. 1, the Doherty amplifier includes two amplifiers, a carrier amplifier 1 and a peak amplifier 2, and a λΖ4 transmission line A, Β, and C force. Note that the characteristic impedance of λ Ζ4 transmission line Α is Z, the characteristic impedance of λ Z4 transmission line B is Z, and λ /

0 0

4 The characteristic impedance of transmission line C is Ζ. Of the two amplifiers, only the carrier amplifier 1 operates in the low power region and the carrier amplifier 1 and the peak amplifier 2 operate in the high power region. ) Is bias controlled by a bias circuit (not shown).

[0004] Next, an operation in which the Dono / Tee amplifier shown in FIG. 1 performs high-efficiency amplification will be described. Figure

2 is an equivalent circuit when the Dono and tee amplifier shown in FIG. 1 operates in the low power region, and FIG. 3 shows the Dono and tee amplifier shown in FIG. 1 in the high power region. This is an equivalent circuit. In other words, the equivalent circuit diagrams in Figs. 2 and 3 connect impedance Ζ as load 3.

0 Indicates the impedance when viewing the load 3 side from each node when connected.

[0005] As shown in FIG.

0 is λ され directly connected to load 3

4Converted to impedance Ζ Ζ2 by transmission line C. Also, the output power is a predetermined level.

0

Since the peak amplifier 2 is OFF at low power lower than the bell, the peak amplifier 2 The output impedance of is open. Therefore, the impedance when the load 3 side is viewed from the λ Z4 transmission line A becomes Z Z2 as it is. Sarako, this impedance Z / 2 is characteristic

0 0

Impedance is transformed by impedance λ Ζ4 transmission line 、, and from carrier amplifier 1

0

The impedance when looking at the load 3 side is 2Z.

0

On the other hand, when the output power is higher than a predetermined level, the peak amplifier 2 is turned on and the peak amplifier 2 supplies power to the load 3 as shown in FIG. At this time, since the impedance on the input side of λ Ζ4 transmission line C is Ζ Ζ2, λ Ζ4 transmission line

0

In the roadside force, the impedance when looking at the load 3 side and the impedance when looking at the load 3 side from the peak amplifier 2 are both Z. Also, the impedance when looking at the load 3 side from λ / 4 transmission line Α

Since the characteristic impedance Z of 0 0 and λ Z4 transmission line A are equal, load from carrier amplifier 1

0

The impedance when looking at the 3 side is also Z.

0

[0007] From the above, the load impedance of the carrier amplifier 1 is 2Z during low power operation.

0, which means that it becomes z when operating at high power. In other words, when operating at low power

0

Thus, the impedance of the carrier amplifier 1 viewed from the load 3 side is high impedance, and when operating at high power, the impedance of the carrier amplifier 1 viewed from the load 3 side is low impedance. Therefore, when the load impedance is 2Z (that is, low power

0

The carrier amplifier 1 is designed so that the saturation power is reduced but the efficiency is high, and the saturation power is increased when the load impedance is Z (that is, during high power operation).

0

If the carrier amplifier 1 is designed, the Dono and Tee amplifiers can realize highly efficient power amplification over a wide dynamic range.

However, there is a problem that the Doherty amplifier generates distortion at the same time that the Doherty amplifier performs high-efficiency power amplification. As for the force, strain and efficiency generally have a trade-off relationship. Therefore, various techniques for increasing efficiency while suppressing distortion degradation in a Doherty amplifier have been disclosed. For example, by suppressing the power supply voltage applied to each of two amplifiers connected in parallel (that is, a carrier amplifier and a peak amplifier), distortion degradation is suppressed and high-efficiency operation is realized. In other words, in a situation where the distortion level is acceptable, the efficiency is increased by lowering the power supply voltage, and in a situation where the distortion level is not acceptable, the power supply voltage is increased, so that (For example, refer to Patent Document 1).

[0009] Further, a technique for controlling distortion input and realizing high-efficiency operation by controlling both the input level of the RF signal and the power supply voltage is also known for the Doherty amplifier. In other words, when the input level of the RF signal is below the threshold and the distortion level is acceptable, the efficiency is increased by lowering the power supply voltage, and when the input level of the RF signal is above the threshold and the distortion level is not acceptable. Therefore, distortion degradation is suppressed by raising the power supply voltage (see, for example, Patent Document 2).

Non-Patent Document 1: W.H.Doherty, "A New High Efficiency Power Amplifier for Modulated Waves," Proc. IRE, vol.24, no.9, Sept. 1936, ppl 163— 1182

Patent Document 1: Special Table 2001-520828

Patent Document 2: JP 2001-518731

Disclosure of the invention

Problems to be solved by the invention

[0010] However, since the power source mounted on the portable terminal or the like is generally a secondary battery such as a lithium ion battery, the electromotive force decreases with time. Therefore, if the usage time of the portable terminal becomes longer, the power supply voltage of the Dono / Tee amplifier built into the portable terminal will decrease, and as a result, the distortion characteristics of the Dono / Tee amplifier will deteriorate. The linearity of the output power will deteriorate. In other words, even if high-efficiency power amplification is obtained over a wide dynamic range by the Doherty amplifier, distortion is degraded due to a decrease in the power supply voltage caused by the secondary battery, and output power with good linearity cannot be obtained. End up.

The present invention has been made in view of such circumstances, and provides a wireless communication apparatus including a Doherty amplifier that can prevent distortion deterioration due to a decrease in power supply voltage with a simple circuit configuration. Objective.

Means for solving the problem

The wireless communication apparatus of the present invention includes a carrier amplifier that performs power amplification in all power regions and a peak amplifier that performs power amplification in a high power region higher than a predetermined power in parallel. A wireless communication apparatus including an amplifier is configured to include constant power supply voltage supply means for supplying a constant power supply voltage to the carrier amplifier. The invention's effect

[0013] According to the Doherty amplifier applied to the radio communication apparatus of the present invention, by providing the constant power supply voltage supply means for supplying a constant power supply voltage only to the carrier amplifier, distortion degradation in the Doherty amplifier is reduced. And good linearity can be maintained. Further, since distortion deterioration can be suppressed, the Doherty amplifier can be used up to the limit of the rated specification, and the knock-off with respect to the rating of the Doherty amplifier can be reduced. As a result, since the devices constituting the Doherty amplifier can be reduced in capacity, it is possible to improve the specification efficiency (specification) of the radio communication apparatus.

[0014] Further, when a DC-DC converter is used as a constant power supply voltage supply means for supplying a constant voltage to the carrier amplifier, for example, the DC-DC converter does not supply power to the peak amplifier. The load current can be reduced. As a result, the circuit scale and element capacity of the DC-DC converter can be reduced. In addition, when a secondary battery is used as a power source, the life of the secondary battery can be increased. Brief Description of Drawings

[0015] [FIG. 1] Schematic configuration diagram of commonly known Dono and Tee amplifiers

[Fig. 2] Equivalent circuit when Doherty amplifier shown in Fig. 1 operates in the low power region [Fig. 3] Equivalent circuit when Doherty amplifier shown in Fig. 1 operates in the high power region 圆 4] Power supply voltage in Doherty amplifier Characteristic diagram showing the relationship of distortion deterioration due to lowering

FIG. 5 is a basic circuit diagram of a radio communication apparatus according to Embodiment 1 of the present invention.

FIG. 6 is a basic circuit diagram of a radio communication apparatus according to Embodiment 2 of the present invention.

FIG. 7 is a basic circuit diagram of a radio communication apparatus according to Embodiment 3 of the present invention.

FIG. 8 is a basic circuit diagram of a radio communication apparatus according to Embodiment 4 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The Dono and Tee amplifiers applied to the wireless communication apparatus of the present invention pay attention to the fact that the distortion deteriorates when the power supply voltage of the carrier amplifier decreases almost without being affected by the decrease of the power supply voltage of the peak amplifier. Thus, there is provided a constant power supply means for keeping the power supply voltage of only the carrier amplifier constant. This makes it high over a wide dynamic range. In addition to maintaining efficiency, it is possible to realize a Dono, Tee amplifier, and a wireless communication apparatus equipped with the Doherty amplifier having good linearity by preventing deterioration of distortion.

[0017] Next, some specific embodiments of Dono and Tee amplifiers applied to the wireless communication apparatus of the present invention will be described in detail. Note that in the drawings used in the following embodiments, the same components are denoted by the same reference numerals, and redundant description will be omitted as much as possible.

The inventors have found from experimental results that, in the carrier amplifier and the peak amplifier constituting the Doherty amplifier, the distortion of the Dono and Tee amplifiers deteriorates when the power supply voltage of the carrier amplifier decreases. Hereinafter, in order to facilitate understanding of the present invention, it will be described that the distortion characteristics of the Doherty amplifier depend on the power supply voltage of the carrier amplifier.

FIG. 4 is a characteristic diagram showing the relationship of distortion degradation due to a drop in power supply voltage in the Doherty amplifier, where the horizontal axis shows output power and the vertical axis shows distortion. In other words, as shown in the solid line in FIG. 4, the distortion characteristics of the Donoty amplifier (a), the Doherty amplifier gradually increases in distortion as the output power increases, and exceeds a predetermined output power. The distortion suddenly increases.

Here, the distortion characteristic (b) shown by the broken line when the power supply voltage of only the peak amplifier is lowered is almost the same as the distortion characteristic (a) of the Dono and Tee amplifiers. However, the distortion characteristics when the power supply voltage of the carrier amplifier alone is lowered, as shown by the broken line (c), are greatly deteriorated. In other words, as shown in the distortion characteristic (c) when the power supply voltage of only the carrier amplifier is lowered, the distortion increases rapidly even when the output power is relatively small. The distortion characteristics when the power supply voltage of both the peak amplifier and the carrier amplifier are lowered are shown by the broken line (d). It is almost the same as (c). In other words, since most of the output power is amplified by the carrier amplifier, it can be said that the distortion characteristics of the carrier amplifier are almost equal to the distortion characteristics of the Doherty amplifier. As described above, when the power supply voltage of the carrier amplifier is lowered, the distortion of the Doherty amplifier is greatly deteriorated.

[0021] On the other hand, since the power source mounted on the mobile terminal is generally a secondary battery such as a lithium ion battery, the power supply voltage of the carrier amplifier decreases as the usage time of the mobile terminal increases. As a result, distortion of the Doherty amplifier deteriorates and the linearity of the output power deteriorates. Therefore, the Dono / Tee amplifier according to the first embodiment of the present invention is provided with constant power supply voltage supply means for making the power supply voltage of only the carrier amplifier constant.

FIG. 5 is a basic circuit diagram of the radio communication apparatus according to Embodiment 1 of the present invention.

As shown in FIG. 5, the Doherty amplifier 101 applied to the radio communication apparatus of the present invention has a configuration in which a carrier amplifier 102 and a peak amplifier 103 are connected in parallel, and the carrier amplifier 102 includes a first amplifier Power is supplied from the battery 104 via the constant power supply voltage supply means 106, and the peak amplifier 103 is configured to be supplied with power directly from the second battery 105. Here, the first battery 104 and the second battery 105 may be the same battery. In the Doherty amplifier 101 shown in FIG. 5, the carrier amplifier 102, the peak amplifier 103, and the λΖ4 transmission line inserted into the output circuit are omitted.

In FIG. 5, the constant power supply voltage supply means 106 has a function of supplying a power supply voltage of a constant voltage to the carrier amplifier 102, and the circuit is integrated to make it one chip or high. It can be realized by a DC-DC converter with a bridge configuration and SiP (System in Package). Such DC-DC converters are widely put into practical use by circuit configurations such as switching regulators and ringing choke converters (RCC). The DC-DC converter used as the constant power supply voltage supply means 106 can output a constant voltage even when the battery voltage of the first battery 104 drops, whether it is a step-up DC-DC converter or a step-down DC-DC converter. Any constant voltage power supply may be used.

Next, in the wireless communication apparatus of FIG. 5, the operation in which the Doherty amplifier 101 can maintain high-efficiency power amplification and low distortion characteristics over a wide dynamic range will be described. In the Doherty amplifier 101, when the output power supplied to the load 110 is in the low power mode lower than the predetermined value, only the carrier amplifier 102 performs the amplification operation, and when the output power is in the high power mode higher than the predetermined value. The carrier amplifier 102 and the peak amplifier 103 perform the amplification operation, so that the low power mode power and the high efficiency power amplification are performed over a wide dynamic range up to the high power mode.

[0025] At this time, if the Dono-Tee amplifier 101 is continuously used, the power of reducing the voltage of the first battery 104 and the second battery 105 is reduced even if the voltage of the first battery 104 is reduced. Constant power supply voltage A constant voltage is always supplied to the carrier amplifier 102 by the constant voltage action of the supply means 106. On the other hand, when the voltage of the second battery 105 decreases, a voltage in a state where the battery voltage is decreased is supplied to the peak amplifier 103. Here, as described above, since the power supply voltage of the carrier amplifier 102 is held at a constant voltage, even if the power supply voltage of the peak amplifier 103 decreases, the Dono / Tee amplifier 101 has a low distortion level. Can be maintained. In other words, the Dono-Tee amplifier 101 can continue to operate while maintaining good linearity with high efficiency and low distortion over a wide dynamic range even when the battery voltage drops.

[0026] In this way, distortion degradation of the Dono and tee amplifier 101 can be suppressed over a wide power range, so that the Dono and tee amplifier 101 can be used up to the limit of the rated specification. . That is, the knock-off with respect to the rating of the Dono / Tee amplifier 101 can be reduced. As a result, it is possible to use a device with a rating specification that is one rank lower (i.e., Doherty amplifier 101), thus achieving higher efficiency and lower distortion while further reducing the cost of wireless communication equipment. It becomes possible.

[0027] Further, the Doherty amplifier 101 does not allow the carrier amplifier 102 and the peak amplifier 103 to operate in a balanced configuration as a class AB amplifier! /, So the constant power supply voltage supply means 106 is replaced with a carrier amplifier. If only 102 is provided, it is possible to prevent distortion deterioration, so that the rated level of the constant power supply voltage supply means 106 can be reduced. Therefore, it is possible to lower the rating of circuit elements that are constituent elements of a DC-DC converter and reduce the circuit scale, so that it is also possible to reduce the cost of wireless communication devices.

[0028] Furthermore, since the DC-DC converter only needs to supply power to one of the amplifiers (that is, the carrier amplifier 102), the load current of the DC-DC converter can be reduced. As a result, the battery ( That is, the lifetime of the first battery 104) can be extended. In other words, it is possible to extend the life of the battery used in the wireless communication device, and as a result, it is possible to further reduce the size of the wireless communication device by reducing the size of the battery.

FIG. 6 is a basic circuit diagram of the radio communication apparatus according to Embodiment 2 of the present invention. The wireless communication device of the second embodiment shown in FIG. 6 is the wireless communication device of the first embodiment shown in FIG. The difference is that power supply voltage drop detection means 107 and power supply voltage supply path switching means 108 are added. The power supply voltage drop detecting means 107 has a function of detecting whether or not the voltage of the first battery 104 has fallen below the voltage threshold. Further, the power supply voltage supply path switching means 108 bypasses the constant power supply voltage supply means 106 and connects the first battery 104 to the carrier amplifier 102 based on the detection result of the power supply voltage drop detection means 107. It has a function of switching between the path and the second path that passes the constant power supply voltage supply means 106 and connects the first battery 104 to the carrier amplifier 102.

That is, the power supply voltage supply path switching unit 108 supplies power from the first battery 104 to the carrier amplifier 102 depending on whether the voltage of the first battery 104 is in the normal range or decreases. Are switched to a first path that bypasses constant power supply means 106 and a second path that passes constant power supply means 106.

In other words, the power supply voltage drop detection means 107 is a means for detecting a voltage drop of the first battery 104, and can be realized by, for example, a DC voltage detection sensor. Further, the power supply voltage supply path switching means 108 is used when the power supply voltage drop detecting means 107 does not detect a voltage drop of the first battery 104 (that is, when the voltage of the first battery 104 is in a normal range). ), The path is switched so that the path of the first battery 104 becomes the first path bypassing the constant power supply voltage supply means 106, and the power supply voltage drop detection means 107 detects the voltage drop of the first battery 104 (That is, when the voltage of the first battery 104 drops below a predetermined level), the path of the first battery 104 becomes a second path that passes through the constant power supply voltage supply means 106. Perform path switching. Such a power supply voltage supply path switching means 108 can be realized by, for example, a semiconductor switch that is turned ON / OFF by a signal from the power supply voltage drop detection means 107.

Next, the operation of the wireless communication apparatus in the second embodiment shown in FIG. 6 will be described within a range that does not overlap with the first embodiment. In the wireless communication device of the first embodiment shown in FIG. 5, the constant power supply voltage supply means 106 is always used. However, in the wireless communication device of the second embodiment shown in FIG. Whether or not the constant power supply voltage supply means 106 is used is determined depending on whether or not a voltage drop of the battery 104 is detected. That is, depending on whether or not the voltage of the first battery 104 is lower than a predetermined voltage threshold, Whether to use the power supply voltage supply means 106 is determined.

[0033] That is, when the voltage of the first battery 104 is in the normal range, the power supply voltage drop detection means 107 does not send a battery voltage drop signal to the power supply voltage supply path switching means 108. The path switching means 108 supplies the power to the carrier amplifier 102 by bypassing the constant power supply voltage supply means 106 with the path of the first battery 104 as the first path.

Next, when the voltage of the first battery 104 falls below a predetermined voltage threshold, the power supply voltage drop detection means 107 transmits a battery voltage drop signal to the power supply voltage supply path switching means 108. Then, the power supply voltage supply path switching means 108 switches the path of the first battery 104 to the second path and supplies power to the carrier amplifier 102 using the constant power supply voltage supply means 106. As a result, even when the voltage of the first battery 104 falls below the voltage threshold, a constant voltage power source can be supplied to the carrier amplifier 102.

FIG. 7 is a basic circuit diagram of a radio communication apparatus according to Embodiment 3 of the present invention. The wireless communication device of the third embodiment shown in FIG. 7 is different from the wireless communication device of the first embodiment shown in FIG. 5 in that an RF input level detection means 109 and a power supply voltage supply path switching means 108 are added. Is a point. The RF input level detection means 109 has a function of detecting whether or not the power level of the RF input signal is higher than the power threshold. The power supply voltage supply path switching means 108 connects the first battery 104 to the carrier amplifier 102 by bypassing the constant power supply voltage supply means 106 based on the detection result of the RF input level detection means 109. 1 has a function of switching between a first path and a second path that connects the first battery 104 to the carrier amplifier 102 through the constant power supply voltage supply means 106.

That is, the power supply voltage supply path switching means 108 is a constant power supply voltage supply means for supplying power from the first battery 104 to the carrier amplifier 102 depending on whether the power level of the RF input signal is low or high. The first path that bypasses 106 and the second path that passes the constant power supply voltage supply means 106 are switched. That is, the power supply voltage supply path switching unit 108 determines whether or not to use the constant power supply voltage supply means 106 according to the power level of the RF input signal.

[0037] In other words, when the power level of the RF input signal does not exceed the predetermined threshold, Since the RF input level detecting means 109 does not send a signal indicating that the power level of the RF input signal has increased to the power supply voltage supply path switching means 108, the power supply voltage supply path switching means 108 is not connected to the first battery 104. The power supply is supplied to the carrier amplifier 102 by bypassing the constant power supply means 106 by using the first path as a first path. This is because when the power level of the RF input signal is low, the distortion of the RF input signal is small, so even if the voltage supplied to the carrier amplifier 102 decreases, there is almost no distortion degradation of the Doherty amplifier 101. This means that the voltage of the first battery 104 may be supplied to the carrier amplifier 102 by bypassing the voltage supply means 106.

[0038] When the power level of the RF input signal exceeds a predetermined threshold value, the RF input level detection means 109 sends a signal indicating that the power level of the RF input signal has increased to the power supply voltage supply path switching means 108. Therefore, the power supply voltage supply path switching means 108 switches the path of the first battery 104 to the second path, passes the constant power supply voltage supply means 106, and supplies power to the carrier amplifier 102. This is because when the power level of the RF input signal is high, the distortion of the RF input signal is also large. Therefore, when the voltage supplied to the carrier amplifier 102 is decreased, the distortion deterioration of the Doherty amplifier 101 is increased. This means that a constant voltage is supplied to the carrier amplifier 102 via the constant power supply voltage supply means 106.

FIG. 8 is a basic circuit diagram of the radio communication apparatus according to Embodiment 4 of the present invention. The wireless communication apparatus of the fourth embodiment shown in FIG. 8 is a combination of the wireless communication apparatus of the second embodiment shown in FIG. 6 and the wireless communication apparatus of the third embodiment shown in FIG. That is, the wireless communication apparatus according to the fourth embodiment determines whether the voltage of the first battery 104 has decreased below a predetermined voltage threshold, and whether the power level of the RF input signal has exceeded a predetermined power threshold. Accordingly, whether or not to use the constant power supply means 106 is determined. Therefore, the power supply path of the carrier amplifier 102 in the wireless communication apparatus of the fourth embodiment shown in FIG. 8 is the constant power supply voltage supply means 106, the power supply voltage drop detection means 107, the power supply voltage supply path switching means 108, and the RF The input level detecting means 109 is configured.

That is, power supply voltage drop detection means 107 detects that the voltage of first battery 104 has fallen below a predetermined voltage threshold value, and RF input level detection means 109 detects the power of the RF input signal. When it is detected that the power level exceeds a predetermined power threshold, the power supply voltage supply path switching means 108 switches the path of the first battery 104 to the second path passing through the constant power supply voltage supply means 106. This is because distortion deterioration is likely to occur when the power level of the RF input signal is high and the voltage of the first battery 104 is low. In such a state, the first battery 104 supplies a constant power supply voltage supply means. This means that a constant voltage is supplied to the carrier amplifier 102 via 106. In addition, when the power level of the RF input signal is low, distortion degradation is unlikely to occur even if the voltage of the first battery 104 is low. This means that the power supply voltage may be supplied to

Industrial applicability

According to the wireless communication device of the present invention, the Dono and Tee amplifiers can be made highly efficient and low distortion with a simple circuit configuration, and therefore can be effectively used for mobile communication terminals such as portable terminals. Is possible.

Claims

The scope of the claims

[1] A wireless communication device including a Doherty amplifier in which a carrier amplifier that performs power amplification in all power regions and a peak amplifier that performs power amplification in a high power region higher than a predetermined power are configured in parallel. And

A wireless communication apparatus comprising a constant power supply voltage supply means for supplying a constant power supply voltage to the carrier amplifier.

[2] power supply voltage drop detecting means for detecting whether or not the power supply voltage has fallen below a voltage threshold;

Based on the detection result of the power supply voltage drop detection means, the constant power supply voltage supply means is bypassed through the first path for supplying the power supply voltage to the carrier amplifier and the constant power supply voltage supply means is passed. 2. The wireless communication apparatus according to claim 1, further comprising power supply voltage supply path switching means for switching to a second path for supplying the power supply voltage to the carrier amplifier.

[3] The power supply voltage supply path switching means switches to the second path when the power supply voltage detected by the power supply voltage drop detection means is lower than the voltage threshold, and the power supply detected by the power supply voltage drop detection means 3. The wireless communication apparatus according to claim 2, wherein when the voltage is higher than the voltage threshold, switching to the first path is performed.

[4] RF input level detection means for detecting whether the power level of the RF input signal is higher than the power threshold;

Based on the detection result of the RF input level detection means, a first path for supplying the power supply voltage to the carrier amplifier bypassing the constant power supply voltage supply means and the constant power supply voltage supply means are passed. 2. The wireless communication apparatus according to claim 1, further comprising power supply voltage supply path switching means for switching to a second path for supplying the power supply voltage to the carrier amplifier.

[5] The power supply voltage supply path switching means switches to the second path when the power level of the RF input signal detected by the RF input level detection means is higher than the power threshold, and the RF input level detection means 5. The wireless communication apparatus according to claim 4, wherein when the detected power level of the RF input signal is lower than the power threshold, switching to the first path is performed.

[6] A power supply voltage drop detecting means for detecting whether or not the power supply voltage has fallen below a voltage threshold;

RF input level detection means for detecting whether the power level of the RF input signal is higher than the power threshold;

Based on the detection result of the power supply voltage drop detection means and the detection result of the RF input level detection means, a first path for supplying the power supply voltage to the carrier amplifier by bypassing the constant power supply voltage supply means; 2. The wireless communication apparatus according to claim 1, further comprising power supply voltage supply path switching means for switching to a second path for supplying the power supply voltage to the carrier amplifier through the constant power supply voltage supply means.

[7] When the power level of the RF input signal detected by the RF input level detection means is higher than the power threshold, the power supply voltage supply path switching means detects the level of the power supply voltage detected by the power supply voltage drop detection means. Accordingly, switching to the second path and switching to the first path are appropriately performed, and when the power level of the RF input signal detected by the RF input level detection means is lower than the power threshold, 7. The wireless communication device according to claim 6, wherein switching to the first path is performed regardless of the power supply voltage detected by the power supply voltage drop detection means.