JP5545189B2 - Amplifier and communication device - Google Patents

Description

The present invention relates to a high-frequency power amplifier used in a communication device or the like and a communication device using the same.

In general, as shown in FIG. 11, when the amplifier is operated near the saturation region, high efficiency can be obtained. However, the amplifier used in the communication apparatus has a large offset back-off in order to avoid the influence of distortion caused by the nonlinearity of the amplifier, and the efficiency is low.
As an amplifier that operates with high efficiency while maintaining linearity, conventionally, a first path having a carrier amplifier and a second path having a peak amplifier are connected in parallel between an input terminal and an output terminal, and the carrier amplifier and the output terminal are connected in parallel. An impedance conversion line having an electrical length that is an odd multiple of a quarter wavelength of the input signal is provided between the input terminal and a phase compensation circuit that cancels the phase difference caused by the impedance conversion line between the input terminal and the peak amplifier. There is a Doherty amplifier (see, for example, Patent Document 1).

JP 2005-303771 A

In such a Doherty amplifier, when the frequency of the input signal increases, the distance between the output terminal of the carrier amplifier and the output terminal of the peak amplifier becomes longer than the wavelength of the input signal, and the efficiency of the amplifier deteriorates.

The present invention has been made to solve such a problem, and an object of the present invention is to obtain an amplifier capable of high-efficiency operation even when a signal to be amplified is a signal in a high frequency band.

An amplifier according to the present invention includes a first input terminal that inputs a signal, an output terminal that outputs a signal, a first transistor and a first output unit, and is connected between the input terminal and the output terminal. A carrier amplifier and a first line having an electrical length of approximately one quarter wavelength of the signal or approximately three quarter wavelengths of the signal and having one end connected in series to the first output of the first carrier amplifier; A second line having an electrical length corresponding to a phase difference due to the first line and connected in parallel with the first carrier amplifier at the input end, a second transistor and a second output unit; A first peak amplifier connected in series between the first line and the output end and having the other end of the first line connected to the second output unit, the first carrier amplifier and the first peak The amplifier is arranged so that the first output section and the second output section face each other, and the first transistor and the first output section are arranged. The second transistor is characterized in that the angular difference between the output direction vector of the signal to be transmitted is arranged to be 180 deg.

In addition, an amplifier according to the present invention includes an input end for inputting a signal, an output end for outputting a signal, a first transistor and a first output section, and is connected between the input end and the output end. A first peak amplifier and a first amplifier having an electrical length of approximately one quarter wavelength of the signal or approximately three quarter wavelengths of the signal and having one end connected in series to the first output of the first peak amplifier. A line, a second line having an electrical length corresponding to a phase difference due to the first line and connected in parallel with the first peak amplifier at the input end, a second transistor, and a second output unit A first carrier amplifier connected in series between a second line and the output end, and having a second output section connected to the other end of the first line. The first carrier amplifier is arranged so that the first output unit and the second output unit face each other, and the first transistor Data and second transistors, is characterized in that the angular difference between the output direction vector of the signal to be transmitted is arranged to be 180 deg.

In addition, a communication device according to the present invention includes a digital processing unit that digitally processes a signal, a converter that converts the frequency of the signal processed by the digital processing unit, an amplifier that amplifies the signal frequency-converted by the converter, and an amplifier A filter unit that removes the noise component of the signal amplified by the antenna, and an antenna unit that outputs the signal from which the noise component has been removed by the filter unit, and this amplifier inputs the signal frequency-converted by the converter An input terminal, an output terminal for outputting a signal, a first unit amplifier having a first transistor and a first output unit and connected between the input terminal and the output terminal, and approximately a quarter of the signal; Corresponds to the phase difference between the first line having the electrical length of approximately three-quarters of the wavelength or signal and one end connected in series to the first output of the first unit amplifier. A second line connected to the input terminal in parallel with the first unit amplifier, a second transistor and a second output unit, and between the second line and the output terminal. A second unit amplifier connected in series and having the other end of the first line connected to the second output unit. The first unit amplifier and the second unit amplifier include the first output unit and the second unit amplifier. The second output unit is arranged so as to be opposed to each other, and the first transistor and the second transistor are arranged so that an angle difference of an output direction vector of a signal to be transmitted is 180 deg. .

According to the present invention, an input terminal for inputting a signal, an output terminal for outputting a signal, a first carrier having a first transistor and a first output unit and connected between the input terminal and the output terminal. An amplifier and a first line having an electrical length of approximately one quarter wavelength of the signal or approximately three quarter wavelengths of the signal and having one end connected in series to the first output of the first carrier amplifier; A second line having an electrical length corresponding to the phase difference of the first line and connected in parallel with the first carrier amplifier at the input end; a second transistor; and a second output unit. A first peak amplifier connected in series between the line and the output end and having the other end of the first line connected to the second output unit, the first carrier amplifier and the first peak unit The amplifier is arranged so that the first output unit and the second output unit are opposed to each other, and the first transistor and the The second transistor is arranged so that the angular difference of the output direction vector of the signal to be transmitted is 180 deg, so that an amplifier capable of high-efficiency operation can be obtained even if the signal to be amplified is a high frequency band signal. Can do.

In addition, according to the present invention, the first input terminal having the input terminal for inputting the signal, the output terminal for outputting the signal, the first transistor and the first output unit, and connected between the input terminal and the output terminal. And a first line having an electrical length of approximately one quarter wavelength of the signal or approximately three quarter wavelengths of the signal and having one end connected in series to the first output section of the first peak amplifier A second line having an electrical length corresponding to a phase difference due to the first line and connected in parallel with the first peak amplifier at the input end, a second transistor and a second output unit. A first carrier amplifier connected in series between the two lines and the output end, and connected to the second output section at the other end of the first line. The carrier amplifier is arranged so that the first output portion and the second output portion face each other, and the first transistor and the first output portion are arranged. The second transistor is arranged so that the angular difference of the output direction vector of the signal to be transmitted is 180 deg, thereby obtaining an amplifier capable of high-efficiency operation even if the signal to be amplified is a high frequency band signal. be able to.

According to the present invention, the digital processing unit that digitally processes the signal, the converter that converts the frequency of the signal processed by the digital processing unit, the amplifier that amplifies the signal frequency-converted by the converter, and the amplifier that amplifies the signal A filter unit that removes a noise component of the received signal, and an antenna unit that outputs a signal from which the noise component has been removed by the filter unit, and the amplifier has an input terminal for inputting the signal frequency-converted by the converter An output terminal for outputting a signal, a first unit amplifier having a first transistor and a first output unit and connected between the input terminal and the output terminal, An electrical length corresponding to a phase difference between a first line having an electrical length of approximately three-quarters of a signal and having one end connected in series to the first output of the first unit amplifier. The A second line connected in parallel with the first unit amplifier at the input end, a second transistor and a second output unit, and connected in series between the second line and the output end; A second unit amplifier in which the other end of the first line is connected to the two output units, the first output unit and the second output unit are arranged to face each other, and the first unit amplifier and The second unit amplifier is arranged so that the first output unit and the second output unit are opposed to each other, and the first transistor and the second transistor have an angular difference of 180 degrees in the output direction vector of the signal to be transmitted. With this arrangement, it is possible to obtain a communication apparatus capable of amplifying a signal with high efficiency even when the digitally processed signal is converted into a high frequency band signal and then amplified and output.

It is a figure which shows the structure of the communication apparatus using the Doherty amplifier which concerns on Embodiment 1 of this invention. It is a figure which shows the circuit structure of the Doherty amplifier shown in FIG. It is a figure which shows the example of arrangement | positioning of the Doherty amplifier shown in FIG. FIG. 4 is a perspective view directly below a substrate of the Doherty amplifier shown in FIG. 3. It is a figure which shows the relationship between the distance between the output part of a carrier amplifier, and the output part of a peak amplifier, and drain efficiency. It is a figure which shows another structure and arrangement example of the Doherty amplifier shown in FIG. It is a figure which shows another structure and arrangement example of the Doherty amplifier shown in FIG. It is a figure which shows the structure and example of arrangement | positioning of an inverted doherty amplifier. It is a figure which shows the example of arrangement | positioning of the Doherty amplifier which concerns on Embodiment 2 of this invention. FIG. 10 is a perspective view of the Doherty amplifier shown in FIG. It is a figure which shows the drain efficiency of the conventional Doherty amplifier.

Embodiment 1 FIG.
A Doherty amplifier 5 according to Embodiment 1 for carrying out the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating a configuration of a communication device 1 using a Doherty amplifier 5. In FIG. 1, a communication apparatus 1 includes an input interface 2 to which a signal is input, a digital circuit 3 that digitally processes the input signal, that is, a digital processing unit, a frequency converter 4 that performs frequency conversion of the digitally processed signal, A Doherty amplifier 5 that amplifies the intensity of the frequency-converted signal, an isolator 6 and a low-pass filter 7 (hereinafter referred to as LPF 7) that removes noise components of the amplified signal, that is, a filter unit, and a signal from which noise is removed And the antenna 8 to be operated.

Next, the configuration of the Doherty amplifier 5 and the configuration of the Doherty amplifier 5 will be described. As shown in FIG. 2, the Doherty amplifier 5 has two parallel circuits between an input terminal 10 and an output terminal 11, and one circuit includes a class A or class B carrier amplifier 12, that is, a first carrier amplifier. Are connected in series with the conductor line 14 having the electrical length of approximately a quarter wavelength of the input signal, that is, the first line, and the other circuit is a conductor line 15 that cancels the phase difference due to the electrical length of the conductor line 14. The second line and the class C peak amplifier 13, that is, the first peak amplifier are connected in series.

FIG. 3 is a diagram showing an arrangement of elements constituting the Doherty amplifier 5. The Doherty amplifier 5 is formed on, for example, a glass epoxy or alumina substrate 22, and the elements are connected by a conductor line of Cu or Au. In FIG. 3, a conductor line 16 is provided between the input terminal 10 and the carrier amplifier 12, and a conductor line 17 having an electrical length substantially equal to that of the conductor line 16 is provided between the conductor line 15 and the peak amplifier 13. These are provided according to the arrangement of the carrier amplifier 12 and the peak amplifier 13, and may be omitted. FIG. 3 schematically shows the arrangement, and the portions connected by solid lines are actually connected by conductor lines.

The carrier amplifier 12 and the peak amplifier 13 are collectively referred to as a unit amplifier and have substantially the same configuration. The carrier amplifier 12 includes an input matching circuit 121, a transistor 120 that operates in class A or class B, and an output matching circuit 122. The peak amplifier 13 includes an input matching circuit 131, a transistor that operates in class C, and an output matching circuit 132. ing.

A heat sink 23 for cooling the carrier amplifier 12 and the peak amplifier 13 is provided under the substrate 22 as shown in FIG. In general, the Doherty amplifier is configured so that the longitudinal direction of the plate-like fins, the transmission direction of the signal amplified by the carrier amplifier, and the transmission direction of the signal amplified by the peak amplifier are all parallel so that the cooling efficiency of the heat sink 23 is the best. It is arranged as follows. When the frequency of the input signal is 14 to 14.5 GHz, approximately a quarter wavelength of the input signal is about 2 mm. Therefore, in this embodiment, the carrier amplifier 12 and the peak amplifier 13 are the output section 124 of the carrier amplifier 12. And the output section 134 of the peak amplifier 13 are arranged on the same straight line so as to face each other. In FIG. 4, the elements and conductor lines on the substrate 22 are indicated by broken lines in order to show the relative relationship between the elements arranged on the substrate 22 and the heat sink 23.

Since the amplifier's main heat source is a transistor, the transistor 120 in the carrier amplifier 12 and the transistor 130 in the peak amplifier 13 have an output direction vector angle difference of 180 deg. The heat sink 23 is disposed under the substrate 22 so that the longitudinal direction of the fins is parallel to these output direction vectors.
As described above, the carrier amplifier 12 and the peak amplifier 13 are arranged on the same straight line so that the output part 124 of the carrier amplifier 12 and the output part 134 of the peak amplifier 13 are opposed to each other. By arranging the heat sink 23 so that the output direction vector of the signal transmitted through 130 is parallel to the longitudinal direction of the fins of the heat sink 23, the carrier amplifier 12 and the peak amplifier 13 can be efficiently cooled by the single heat sink 23. You can also.
The conductor line 16 and the conductor line 17 are not necessarily required, and are provided to arrange the carrier amplifier 12 and the peak amplifier 13 at desired positions.

Here, the electrical length of the conductor line 14 is set to approximately a quarter wavelength of the input signal, but the length is not limited to this, and may be an odd multiple of approximately a quarter wavelength of the input signal. However, as shown in FIG. 5, the longer the distance between the unit amplifiers, the larger the line loss and the lower the drain efficiency of the Doherty amplifier 5. Therefore, the shorter line length is desirable.

For example, when the frequency of the input signal is about 14 to 14.5 GHz, a conductor line having an electrical length of a quarter wavelength is about 2 mm. Since the size of the transistors 120 and 130 is a little less than 1 cm square, the unit amplifiers cannot be arranged in parallel as in the prior art when the conductor line has an electrical length of a quarter wavelength. When the output unit 124 of the carrier amplifier 12 and the output unit 134 of the peak amplifier 130 are opposed to each other as in the present embodiment, the length of the conductor line 14 is less than or equal to the wavelength of the input signal, that is, a quarter wavelength or It becomes possible to set the electrical length to three-quarter wavelengths, and high drain efficiency can be expected. In the Doherty amplifier, the “electric length of about a quarter wavelength” and the “electric length of about a quarter wavelength” generally include an error of plus or minus a quarter wavelength.

The arrangement of the carrier amplifier 12 and the peak amplifier 13 is not limited to the arrangement on the same straight line. If the distance between the output section 124 of the carrier amplifier 12 and the output section 134 of the peak amplifier 13 can be set to a desired electrical length, for example, As shown in FIG. 6, the angle difference between the output direction vectors of the transistor 120 and the transistor 130 may be 120 deg.

FIG. 7 is a diagram showing another arrangement example of elements constituting the Doherty amplifier. In addition to the configuration shown in FIG. 3, the Doherty amplifier 5 b includes a conductor line 18 between the input terminal 10 and the conductor line 16, and a conductor line 19 between the peak amplifier 13 and the output terminal 11. The conductor line 19 is a circuit for adjusting the impedance when the operation of the peak amplifier 13 is off, and the conductor line 18 is a circuit for equalizing the line lengths of the two paths between the input terminal 10 and the output terminal 11. And has an electrical length substantially equal to that of the conductor line 19. The conductor line 19 is preferably designed so that the impedance when the operation of the peak amplifier 13 is off is increased.

Next, the operation will be described.
When a signal is input to the input interface 2 of the communication device 1, digital signal processing is performed by the digital circuit 3. The frequency of the digitally processed signal is about several MHz to several hundred MHz, and is converted into a high frequency signal of about 14 to 14.5 GHz by the frequency converter 4. The frequency-converted signal is amplified by Doherty amplifier 5, noise is removed by isolator 6 and LPF 7, and then output from antenna 8 to the outside of the communication device.
In general, a signal of several hundred MHz or higher is called a high-frequency signal, but here, a signal of about 4 GHz or higher is intended.

Here, the operation of the Doherty amplifier 5 will be described with reference to FIG.
When a signal having a small amplitude is input from the input terminal 10 (hereinafter referred to as “small signal”), the signal is amplified by the carrier amplifier 12 biased to class A or class B, propagates through the conductor line 14 and is output to the output terminal 10. Is output from. At this time, since the peak amplifier 13 biased to class C does not operate, the drive power of the Doherty amplifier 5 is only required for the carrier amplifier 12, and high-efficiency operation is possible.
Note that a signal having a small amplitude means a signal that is equal to or lower than the input power at which output power reduced by 6 dB with respect to the saturation power of the Doherty amplifier is obtained.

On the other hand, when a signal having a large amplitude is input from the input terminal 10 (hereinafter referred to as “large signal”), the carrier amplifier 12 does not operate, only the peak amplifier 13 biased to class C operates, The signal amplified by the amplifier 13 is output from the output terminal 10. At this time, the drive power of the Doherty amplifier 5 is only required for the peak amplifier 13, and high-efficiency operation is possible.
A signal having a large amplitude refers to a signal that is equal to or higher than the input power at which output power that is 6 dB lower than the saturation power of the Doherty amplifier is obtained.

Although the Doherty amplifier 5 has been described here, an amplifier operating in class A or class B may be used. The configuration of such an amplifier operating in class A or class B is the same as that of the Doherty amplifier, except that both the carrier amplifier 12 and the peak amplifier 13 operate at the time of a small signal.

Further, instead of the Doherty amplifier 5, an inverted Doherty amplifier 50 as shown in FIG. The inverted Doherty amplifier 50 is obtained by replacing the arrangement of the carrier amplifier 12 and the peak amplifier 13 of the Doherty amplifier, and operates in the same manner as the Doherty amplifier 5.

According to the present embodiment, the output of the carrier amplifier 12 is set so that the distance between the output unit 124 of the carrier amplifier 12 and the output unit 134 of the peak amplifier 13 becomes an electrical length of a quarter wavelength or a quarter wavelength. Since the section 124 and the output section 134 of the peak amplifier 13 are opposed to each other and connected by the conductor line 14, the line loss on the output end side is suppressed, and high-efficiency operation is possible even if the input signal is a high frequency band signal. Can be obtained. Further, with this configuration, the frequency band in which the Doherty amplifier 5 operates can be widened.
Further, the carrier amplifier 12 and the peak amplifier 13 are set so that the angle difference between the output direction vector of the signal transmitted through the transistor 120 in the carrier amplifier 12 and the output direction vector of the signal transmitted through the transistor 130 in the peak amplifier 13 is 180 deg. The arrangement facilitates production. Furthermore, by arranging the heat sink 23 so that these output direction vectors are parallel to the longitudinal direction of the fins of the heat sink 23, both the carrier amplifier 12 and the peak amplifier 13 can be efficiently cooled by one heat sink. .
The communication device including the Doherty amplifier 5 can operate with high efficiency even when a high frequency signal of about 14 to 14.5 GHz is amplified.

Embodiment 2. FIG.
In the first embodiment, the Doherty amplifier in which the output unit 124 of the carrier amplifier 12 and the output unit 134 of the peak amplifier 13 are arranged to face each other and the communication apparatus using the Doherty amplifier have been described. In the second embodiment, the carrier amplifier 12 and the peak amplifier 13 have a multi-stage structure, and the input part of the carrier amplifier closest to the input terminal and the input part of the peak amplifier are arranged to face each other.

FIG. 9 is a diagram showing a configuration and an arrangement example of the Doherty amplifier 5c in the present embodiment. In addition to the configuration of FIG. 7, a second carrier amplifier 20 is provided between the conductor line 18 and the conductor line 16, and a second peak amplifier 21 is provided between the conductor line 15 and the conductor line 17.

The second carrier amplifier 20 is the carrier amplifier closest to the input terminal 10, the second peak amplifier 21 is the peak amplifier closest to the input terminal 10, and the carrier amplifier 20 and the peak amplifier 21 are input to the carrier amplifier 20. The unit 203 and the input unit 213 of the peak amplifier 21 are arranged so as to face each other on the same straight line. The transistor 200 in the carrier amplifier 20 and the transistor 210 in the peak amplifier 21 have an angle difference of 180 deg. It is arranged to become. By adopting such an arrangement, the line length between the carrier amplifier 20 and the peak amplifier 21 closest to the input terminal 10 can also be set to an electrical length of about a quarter wavelength or an electrical length of about a quarter wavelength. The line loss can be suppressed.

In addition, the output direction vector, which is a direction in which the signal transmitted through the transistor 120 and the transistor 130 is extracted, and the input direction vector, which is a direction in which the signal transmitted through the transistor 200 and the transistor 210 is extracted, are arranged to be 0 deg or 180 deg. This makes it easy to manufacture. Further, as shown in FIG. 10, by arranging the heat sink 23 so that the longitudinal direction of the plate-like fins of the heat sink 23 is parallel to the input direction vector and the output direction vector, these heat sinks 23 can be arranged with the same heat sink 23. It is also possible to cool the transistor efficiently.

Here, a case where each of the carrier amplifier and the peak amplifier has a two-stage configuration is shown, but a multistage connection of three or more stages may be used. Further, only one of them may be a multistage connection. Further, the arrangement of the peak amplifier 21 and the conductor line 15 may be reversed. Since unit amplifiers such as carrier amplifiers and peak amplifiers are connected in multiple stages and gain is accumulated, the Doherty amplifier 5c as a whole can have high gain.
By arranging the peak amplifier 21 and the conductor line 15 as shown in FIG. 9, the influence of the line loss becomes smaller than the arrangement in which these are replaced, and the amplitude of the signal input to the peak amplifier 13 in the subsequent stage is kept large. I can do it.

Since the operation is the same as that of the first embodiment, the description is omitted.
Needless to say, the Doherty amplifier 5c according to the present embodiment can also be used in a communication apparatus. The same effect can be obtained when the above configuration is used in an amplifier that operates in class A or class B or an inverted Doherty amplifier instead of the Doherty amplifier.

According to the present embodiment, in addition to the effects of the first embodiment, the gain can be increased by providing the carrier amplifier and the peak amplifier of the Doherty amplifier 5c in a multistage configuration.
Further, by arranging the carrier amplifier 20 and the peak amplifier 21 so that the input unit 203 of the carrier amplifier 20 closest to the input terminal 10 and the input unit 213 of the peak amplifier 21 face each other, the input unit 203 of the carrier amplifier 20 and the peak The line length between the input portions 213 of the amplifier 21 can also be set to approximately one quarter wavelength electrical length or approximately three quarter wavelengths, and the line loss on the input side can also be suppressed.
In addition, since the angle difference between the input direction vectors of the signals transmitted through the transistor 200 in the carrier amplifier 20 and the transistor 210 in the peak amplifier 21 is 180 degrees, the manufacture is facilitated.
Further, by arranging the heat sink 23 so that these input direction vectors and the longitudinal direction of the fins of the heat sink 23 are parallel, the carrier amplifier 20 and the peak amplifier 21 can be efficiently cooled by one heat sink 23. Further, the output direction vector of the signal transmitted through the transistor 120 in the carrier amplifier 12 closest to the output terminal 11 and the transistor 130 in the peak amplifier 13 closest to the output terminal 11 is set to 0 deg or 180 deg with the input direction vector. With the arrangement, the carrier amplifiers 12 and 20 and the peak amplifiers 13 and 21 can be efficiently cooled with a single heat sink 23.
Further, the input unit 203 of the carrier amplifier 20 closest to the input terminal 10 is opposed to the input unit 213 of the peak amplifier 21, and the output unit 124 of the carrier amplifier 12 closest to the output terminal 11 is opposed to the output unit 134 of the peak amplifier 13. As a result, the total length of the parallel circuit can be shortened compared to the case where the carrier amplifier and the peak amplifier are arranged in parallel, and a small Doherty amplifier 5c can be obtained.

DESCRIPTION OF SYMBOLS 1 Communication apparatus 2 Input interface 3 Digital circuit 4 Frequency converter 5, 5a-5c Doherty amplifier 6 Isolator 7 Low pass filter (LPF)
8 Antenna 10 Input terminal 11 Output terminal 12, 20 Carrier amplifier 13, 21 Peak amplifier 14-19 Conductor line

Claims (6)

An input terminal for inputting a signal;
An output terminal for outputting the signal;
A first carrier amplifier having a first transistor and a first output and connected between the input end and the output end;
A first line having an electrical length of approximately one quarter wavelength of the signal or approximately three quarter wavelengths of the signal and having one end connected in series to the first output of the first carrier amplifier; ,
A second line having an electrical length corresponding to a phase difference due to the first line and connected in parallel with the first carrier amplifier between the input end and the output end;
A second transistor having a second transistor and a second output unit, connected in series between the second line and the output end, and having the other end of the first line connected to the second output unit. 1 peak amplifier, and
The first carrier amplifier and the first peak amplifier are arranged so that the first output unit and the second output unit are opposed to each other,
The amplifier, wherein the first transistor and the second transistor are arranged so that an angle difference between output direction vectors of the signal to be transmitted is 180 deg. An input terminal for inputting a signal;
An output terminal for outputting the signal;
A first peak amplifier having a first transistor and a first output and connected between the input end and the output end;
A first line having an electrical length of approximately one quarter wavelength of the signal or approximately three quarter wavelengths of the signal and having one end connected in series to the first output of the first peak amplifier; ,
A second line having an electrical length corresponding to a phase difference due to the first line and connected in parallel with the first peak amplifier at the input end;
A second transistor having a second transistor and a second output unit, connected in series between the second line and the output end, and having the other end of the first line connected to the second output unit. 1 carrier amplifier,
The first peak amplifier and the first carrier amplifier are arranged so that the first output unit and the second output unit are opposed to each other,
The amplifier, wherein the first transistor and the second transistor are arranged so that an angle difference between output direction vectors of the signal to be transmitted is 180 deg. A second carrier amplifier having a third transistor and a first input section and connected in series between the input end and the first carrier amplifier;
2. A second peak amplifier having a fourth transistor and a second input section, and connected in series between the input terminal and the first peak amplifier. The amplifier according to claim 2. The second carrier amplifier and the second peak amplifier are arranged so that the first input section and the second input section face each other,
4. The amplifier according to claim 3, wherein the third transistor and the fourth transistor are arranged so that an angle difference of an input direction vector of a signal to be transmitted is 180 deg. A heat sink is provided which has fins in the longitudinal direction parallel to the output direction vector of the signal transmitted through the first and second transistors and is provided below the first and second transistors. The amplifier according to claim 1 or 2. A digital processing unit for digitally processing the signal;
A converter that converts the frequency of the signal processed by the digital processing unit;
An amplifier for amplifying the signal frequency-converted by the converter;
A filter unit for removing noise components of the signal amplified by the amplifier;
An antenna unit that outputs the signal from which noise components have been removed by the filter unit;
Have
The amplifier is
An input terminal for inputting the signal frequency-converted by the converter;
An output terminal for outputting the signal;
A first unit amplifier having a first transistor and a first output section and connected between the input end and the output end;
A first line having an electrical length of approximately one quarter wavelength of the signal or approximately three quarter wavelengths of the signal and having one end connected in series to the first output section of the first unit amplifier; ,
A second line having an electrical length corresponding to a phase difference due to the first line and connected in parallel with the first unit amplifier at the input end;
A second transistor having a second transistor and a second output unit, connected in series between the second line and the output end, and having the other end of the first line connected to the second output unit. Two unit amplifiers;
With
The first unit amplifier and the second unit amplifier are arranged so that the first output unit and the second output unit face each other, and the first transistor and the second transistor transmit The communication apparatus is arranged so that an angle difference between output direction vectors of the signals is 180 deg.

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