WO2014147732A1

WO2014147732A1 - Amplification device

Info

Publication number: WO2014147732A1
Application number: PCT/JP2013/057761
Authority: WO
Inventors: 純貴大竹
Original assignee: 日本電気株式会社
Priority date: 2013-03-19
Filing date: 2013-03-19
Publication date: 2014-09-25

Abstract

This amplification device amplifies input signals input from an input terminal, outputs same from an output terminal, and has: a first amplifier that amplifies the input signals; a second amplifier that amplifies a peak component of the input signals; a first phase adjustment unit connected to the first amplifier output, that shifts the phase of the signals amplified by the first amplifier and outputs same, and is capable of adjusting the phase shift amount; and a second phase adjustment unit that shifts the phase of signals output from the first phase adjustment unit and signals output from the second amplifier, outputs same to the output terminal, and is capable of adjusting the phase shift amount.

Description

Amplifier

The present invention relates to an amplification device.

In recent years, there has been a demand for higher efficiency of transmission systems in television broadcasting and mobile communications. In response to such a demand, use of a Doherty amplifier that amplifies power with high efficiency has been studied (for example, see Patent Document 1 (Japanese Patent Laid-Open No. 2008-17072)).

FIG. 1 is a diagram showing a configuration of the Doherty amplifier 10.

1 includes a 90 ° hybrid coupler 11, a carrier amplifier 12, a peak amplifier 13, and

transmission lines

14 and 15. The Doherty amplifier 10 shown in FIG.

The 90 ° hybrid coupler 11 is a directional coupler that distributes an input signal (RF (Radio Frequency) signal) input to the input terminal 20 into two signals, and includes four ports 11a to 11d.

The port 11a is connected to the input terminal 20, the port 11b corresponding to the through port for the port 11a is connected to the input of the peak amplifier 13, and the port 11c corresponding to the coupling port for the port 11a is the input of the carrier amplifier 12. And a port 11 d corresponding to an isolation port for the port 11 a is connected to the absorption resistor 16.

The 90 ° hybrid coupler 11 distributes the signal input from the port 11a into two, outputs one from the port 11b, and outputs the other from the port 11c. Here, the 90 ° hybrid coupler 11 outputs a signal having a phase difference of −90 ° from the signal output from the port 11c from the port 11b.

The carrier amplifier 12 is an amplifier biased to class A or class AB, and amplifies the signal output from the port 11c.

The peak amplifier 13 is an amplifier biased in class C, and amplifies only a high-level signal (peak component) having a power value equal to or higher than a predetermined value among signals output from the port 11b.

The transmission line 14 is connected to the output of the carrier amplifier 12. The transmission line 14 has an electrical length corresponding to ¼ wavelength of the input signal, and outputs the signal output from the carrier amplifier 12 by shifting the phase by 90 °.

The signal output from the transmission line 14 and the signal output from the peak amplifier 13 are combined at a connection point 17 between the output of the transmission line 14 and the output of the peak amplifier 13. Here, the phase difference between the signal output from the port 11 c and the signal output from the port 11 b is −90 °, but the phase of the signal output from the carrier amplifier 12 is shifted by 90 ° by the transmission line 14. Thus, the phase of the signal output from the transmission line 14 matches the phase of the signal output from the peak amplifier 13.

The transmission line 15 is connected to the connection point 17 and the output terminal 30. The transmission line 15 has an electrical length corresponding to a quarter wavelength of the input signal, and the phase of the signal at the connection point 17 (the signal output from the transmission line 14 and the signal output from the peak amplifier 13) is 90. Shift the output to output terminal 30.

As described above, the carrier amplifier 12 is biased to class A or class AB and always amplifies the input signal. On the other hand, the peak amplifier 13 is biased to class C and does not amplify when the level of the input signal is low, but amplifies only when the level of the input signal is high. Therefore, the Doherty amplifier 10 can increase the saturation power while suppressing power consumption, and can amplify the power with high efficiency.

Here, if the impedance of the output load connected to the output terminal 30 is Zout, the characteristic impedance of the transmission line 15 is designed to be √ ((Zout ^ 2) / 2). Therefore, the load impedance viewed from the connection point 17 is Zout / 2.

The characteristic impedance of the transmission line 14 is designed to be Zout. Therefore, when the peak amplifier 13 is off, the load impedance viewed from the carrier amplifier 12 is Zout × 2.

The carrier amplifier 12 and the peak amplifier 13 are designed to operate with high efficiency when the load impedance viewed from the connection point 17 and the load impedance viewed from the carrier amplifier 12 are the values described above.

JP 2008-17072 A

In the Doherty amplifier 10 shown in FIG. 1, when the frequency of the input signal is changed, the electrical length of the

transmission lines

14 and 15 is not equal to ¼ wavelength of the input signal. When the electrical lengths of the

transmission lines

14 and 15 are not equal to ¼ wavelength of the input signal, the load impedance value described above deviates from the value at which the carrier amplifier 12 and the peak amplifier 13 operate with high efficiency, and the Doherty amplifier. 10 efficiency will fall.

An object of the present invention is to provide an amplifying apparatus that can efficiently amplify a signal regardless of the frequency of an input signal.

In order to achieve the above object, the amplification device of the present invention provides
An amplification device that amplifies an input signal input to an input terminal and outputs the amplified signal from an output terminal,
A first amplifier for amplifying the input signal;
A second amplifier for amplifying a peak component of the input signal;
A first phase adjustment unit connected to the output of the first amplifier, shifting and outputting the phase of the signal amplified by the first amplifier, and capable of adjusting the amount of phase shift;
A second phase adjustment capable of shifting the phase of the signal output from the first phase adjustment unit and the signal output from the second amplifier to output to the output terminal and adjusting the phase shift amount Part.

According to the present invention, the signal can be efficiently amplified regardless of the frequency of the input signal.

It is a block diagram which shows the structure of a related amplification apparatus. It is a block diagram which shows the structure of the amplifier of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the amplifier of the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the amplifier of the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the amplifier of the 4th Embodiment of this invention. It is a block diagram which shows the structure of the amplifier of the 5th Embodiment of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 2 is a block diagram showing a configuration of the amplifying apparatus 100 according to the first embodiment of the present invention.

2 includes a 90 ° hybrid coupler 110, a carrier amplifier 120, a peak amplifier 130, a first phase adjustment unit 140, and a second phase adjustment unit 150.

The 90 ° hybrid coupler 110 is a directional coupler that distributes an input signal (RF signal) input to the input terminal 20 into two signals, and includes four ports 110a to 110d.

The port 110a is connected to the input terminal 20, the port 110b corresponding to the through port of the port 110a is connected to the input of the

peak amplifier

130, and 110c corresponding to the coupling port of the port 110a is connected to the input of the carrier amplifier 120. 110d corresponding to the isolation port of the port 110a is connected to the absorption resistor 160.

The 90 ° hybrid coupler 110 distributes the signal input from the port 110a into two, outputs one from the port 110b, and outputs the other from the port 110c. Here, the 90 ° hybrid coupler 11 outputs a signal whose phase difference from the signal output from the port 110c is −90 ° from the port 110b.

The carrier amplifier 120 is an amplifier biased to class A or class AB, and amplifies the signal output from the port 110c.

The peak amplifier 130 is an amplifier biased in class C, and amplifies only a signal component (peak component) whose power value is a high level equal to or higher than a predetermined value among signals output from the port 110b.

The first phase adjustment unit 140 shifts the phase of the signal output from the carrier amplifier 120 by 90 ° (a quarter wavelength of the input signal) and outputs the result.

The signal output from the first phase adjustment unit 140 and the signal output from the peak amplifier 130 are synthesized at the connection point 170 between the output of the first phase adjustment unit 140 and the output of the peak amplifier 130. Here, the phase difference between the signal output from the port 110c and the signal output from the port 110b is −90 °, but the phase of the signal output from the carrier amplifier 120 by the first phase adjustment unit 140 is 90 °. By shifting the angle, the phase of the signal output from the first phase adjustment unit 140 matches the phase of the signal output from the peak amplifier 130.

The second phase adjustment unit 150 is connected to the connection point 170, shifts the phase of the signal at the connection point 170 by 90 ° (one quarter wavelength of the input signal), and outputs it to the output terminal 30.

Next, the configuration of the first phase adjustment unit 140 and the second phase adjustment unit 150 will be described.

First, the configuration of the first phase adjustment unit 140 will be described.

The first phase adjustment unit 140 includes a 90 ° hybrid coupler 141 and

variable capacitors

142 and 143. The 90 ° hybrid coupler 141 is an example of a first 90 ° hybrid coupler, the variable capacitor 142 is an example of a first variable capacitor, and the variable capacitor 143 is an example of a second variable capacitor. It is.

The 90 ° hybrid coupler 141 is a directional coupler having a characteristic impedance of Zout, where the impedance of the output load connected to the output terminal 30 is Zout, and includes four ports 141a to 141a as first to fourth ports. 141d.

The port 141a is connected to the output of the carrier amplifier 120, the port 141b corresponding to the through port for the port 141a is connected to one end of the variable capacitor 142, and the port 141c corresponding to the coupling port for the port 141a is the variable capacitor. A port 141 d connected to one end of the capacitor 143 and corresponding to an isolation port for the port 141 a is connected to the connection point 170.

The variable capacitor 142 has one end connected to the port 141b and the other end grounded.

The variable capacitor 143 has one end connected to the port 141c and the other end grounded.

The capacity of the

variable capacitors

142 and 143 can be changed.

Here, for example, if the capacitances of the

variable capacitors

142 and 143 are set to 0F, the impedance of the

variable capacitors

142 and 143 appears to be open, so that the signal input from the port 141a is reflected at the

ports

141b and 141c. Is totally reflected at 0 ° and output from the port 141d. For example, if the capacitances of the

variable capacitors

142 and 143 are sufficiently increased, the impedances of the

variable capacitors

142 and 143 appear to be 0Ω, so that the signal input from the port 141a is reflected at the

ports

141b and 141c. Is totally reflected at 180 ° and output from the port 141d.

In this way, by changing the capacitance of the

variable capacitors

142 and 143, the phase shift amount of the signal input from the port 141a, passing through the 90 ° hybrid coupler 141, and output from the port 141d is adjusted. be able to. Hereinafter, the phase shift amount by the 90 ° hybrid coupler is referred to as a passing phase.

In the first phase adjustment unit 140, the phase of the signal input to the port 141a is shifted by 90 ° (a quarter wavelength of the input signal) and output from the port 141d, that is, a 90 ° hybrid coupler. The capacitances of the

variable capacitors

142 and 143 are adjusted according to the frequency of the input signal input to the input terminal 20 so that the passing phase of 141 is 90 °.

Next, the configuration of the second phase adjustment unit 150 will be described.

The second phase adjustment unit 150 includes a 90 ° hybrid coupler 151 and

variable capacitors

152 and 153. The 90 ° hybrid coupler 151 is an example of a second 90 ° hybrid coupler, the variable capacitor 152 is an example of a third variable capacitor, and the variable capacitor 153 is an example of a fourth variable capacitor. It is.

The 90 ° hybrid coupler 151 is a directional coupler having a characteristic impedance of √ ((Zout ^ 2) / 2), where Zout is the impedance of the output load connected to the output terminal 30. The four ports 151a to 151d are provided.

The port 151a is connected to the connection point 170, the port 151b corresponding to the through port for the port 151a is connected to one end of the variable capacitor 152, and the port 151c corresponding to the coupling port for the port 151a is connected to the variable capacitor 153. The port 151d is connected to the output terminal 30 and corresponds to an isolation port for the port 151a.

The variable capacitor 152 has one end connected to the port 151b and the other end grounded.

The variable capacitor 153 has one end connected to the port 151c and the other end grounded.

The capacity of the

variable capacitors

152 and 153 can be changed.

Here, for example, if the capacitances of the

variable capacitors

152 and 153 are 0F, the impedance of the

variable capacitors

152 and 153 appears to be open, so that the signal input from the port 151a is reflected at the

ports

151b and 151c. Is totally reflected at 0 ° and output from the port 151d. For example, if the capacitances of the

variable capacitors

152 and 153 are sufficiently increased, the impedance of the

variable capacitors

152 and 153 appears to be 0Ω, so that the signal input from the port 151a is reflected at the

ports

151b and 151c. Is totally reflected at 180 ° and output from the port 151d.

In this way, by changing the capacitance of the

variable capacitors

152 and 153, the phase of the signal that is input from the port 151a, passes through the 90 ° hybrid coupler 151, and is output from the port 151d can be adjusted. .

In the second phase adjustment unit 150, the phase of the signal input to the port 151a is shifted by 90 ° (a quarter wavelength of the input signal) and output from the port 151d, that is, the 90 ° hybrid coupler 151. The capacitances of the

variable capacitors

152 and 153 are adjusted in accordance with the frequency of the input signal input to the input terminal 20 so that the passing phase is 90 °.

Next, the operation of the amplification device 100 of this embodiment will be described.

The 90 ° hybrid coupler 110 distributes the input signal input to the input terminal 20 into two signals, outputs one signal from the port 110b, and outputs the other signal from the port 110c. Here, as described above, the 90 ° hybrid coupler 110 outputs a signal whose phase difference from the signal output from the port 110c is −90 ° from the port 110b.

The carrier amplifier 120 is biased to class A or class AB, and amplifies the signal output from the port 110c from a low level signal component to a high level signal component.

On the other hand, the peak amplifier 130 is biased to class C and amplifies only a high level signal component (peak component) of the signal output from the port 110b.

The first phase adjustment unit 140 shifts the phase of the signal output from the carrier amplifier 120 by the amount of the passing phase of the 90 ° hybrid coupler 141 and outputs the result.

As described above, the capacitances of the

variable capacitors

142 and 143 are adjusted so that the passing phase of the 90 ° hybrid coupler 141 is 90 °. Therefore, the first phase adjustment unit 140 shifts the phase of the signal output from the carrier amplifier 120 by 90 ° and outputs the signal.

The phase difference between the signal output from the port 110c and the signal output from the port 110b is -90 °. Therefore, the phase of the signal output from the carrier amplifier 120 by the first phase adjustment unit 140 is shifted by 90 °, so that the phase of the signal output from the carrier amplifier 120 and the output from the peak amplifier 130 at the connection point 170 are output. The phase of the received signal matches.

At the connection point 170, the signal output from the first phase adjustment unit 140 and the signal output from the peak amplifier 130 are combined.

The second phase adjustment unit 150 shifts the phase of the signal at the connection point 170 by the passing phase of the 90 ° hybrid coupler 151 and outputs it to the output terminal 30.

As described above, the capacitances of the

variable capacitors

152 and 153 are adjusted so that the passing phase of the 90 ° hybrid coupler 151 is 90 °. Therefore, the second phase adjustment unit 150 shifts the phase of the signal at the connection point 170 by 90 ° and outputs the result to the output terminal 30.

Here, a load whose impedance is Zout is connected to the output terminal 30, and the passing phase of the 90 ° hybrid coupler 151 is adjusted to 90 ° (the electrical length is adjusted to ¼ wavelength of the input signal). In this case, the impedance viewed from the connection point 170 is Zout / 2.

Also, when the peak amplifier 130 is off (when the signal is not amplified), the impedance when the peak amplifier 130 is viewed from the connection point 170 is open. At this time, if the passing phase of the 90 ° hybrid coupler 141 is adjusted to 90 ° (when the electrical length is adjusted to ¼ wavelength of the input signal), the 90 ° hybrid as viewed from the carrier amplifier 120. The impedance in anticipation of the coupler 141 is Zout × 2.

As described above, in the carrier amplifier 120 and the peak amplifier 130, the load impedance viewed from the connection point 170 is Zout / 2, and when the peak amplifier 130 is off, the load impedance viewed from the carrier amplifier 120 is Zout × 2. Is designed to operate with high efficiency. Therefore, the carrier amplifier 120 can operate with high efficiency.

On the other hand, when the peak amplifier 130 is on (when a signal is being amplified), the load impedance viewed from the connection point 170 in view of the hybrid coupler 151 is Zout / 2. Therefore, each of the carrier amplifier 120 and the peak amplifier 130 operates with a load of Zout.

Thus, according to the present embodiment, the amplifying apparatus 100 shifts and outputs the phase of the signal output from the carrier amplifier 120, and the first phase adjustment unit 140 capable of adjusting the phase shift amount; The phase of the signal at the connection point 170 between the output of the first phase adjustment unit 140 and the output of the peak amplifier 130 is shifted and output to the output terminal 30, and the second phase adjustment unit 150 capable of adjusting the phase shift amount. And having.

Therefore, regardless of the frequency of the input signal, the phase shift amounts by the first phase adjustment unit 140 and the second phase adjustment unit 150 are adjusted to be 90 ° (for 1/4 wavelength of the input signal), respectively. Therefore, the amplifying apparatus 100 can be operated with high efficiency.

(Second Embodiment)
FIG. 3 is a block diagram showing the configuration of the amplifying apparatus 200 according to the second embodiment of the present invention. In FIG. 3, the same components as those in FIG.

The amplifying apparatus 200 of the present embodiment is different from the amplifying apparatus 100 of the first embodiment in that the 90 ° hybrid coupler 110 is deleted and a third phase adjustment unit 210 is added.

The third phase adjustment unit 210 shifts the phase of the input signal input to the input terminal 20 by 90 ° (a quarter wavelength of the input signal) and outputs the result to the peak amplifier 130.

The third phase adjustment unit 210 includes a 90 ° hybrid coupler 211 and variable capacitance capacitors 212 and 213. The 90 ° hybrid coupler 211 is an example of a third 90 ° hybrid coupler, the variable capacitor 212 is an example of a fifth variable capacitor, and the variable capacitor 213 is an example of a sixth variable capacitor. It is.

The 90 ° hybrid coupler 211 is a directional coupler having a characteristic impedance of Zout, and includes four ports 211a to 211d corresponding to the ninth to twelfth ports.

The port 211a is connected to the input terminal 20, the port 211b corresponding to the through port for the port 211a is connected to one end of the variable capacitor 212, and the port 211c corresponding to the coupling port for the port 211a is the variable capacitor 213. And a port 211d corresponding to an isolation port for the port 211a is connected to an input of the peak amplifier 130.

The variable capacitor 212 has one end connected to the port 211b and the other end grounded.

The variable capacitor 213 has one end connected to the port 211c and the other end grounded.

The capacity of the variable capacitors 212 and 213 can be changed.

Here, for example, when the capacitances of the variable capacitors 212 and 213 are set to 0F, the impedance of the variable capacitors 212 and 213 appears to be open, so that the signal input from the port 211a is reflected at the

ports

211b and 211c. Is totally reflected at 0 ° and output from the port 211d. For example, if the capacitances of the variable capacitors 212 and 213 are sufficiently increased, the impedances of the variable capacitors 212 and 213 appear to be 0Ω, so that the signal input from the port 211a is reflected at the

ports

211b and 211c. Is totally reflected at 180 ° and output from the port 211d.

Thus, by changing the capacitance of the variable capacitors 212 and 213, the phase shift amount of the signal that is input from the port 211a, passes through the 90 ° hybrid coupler 211, and is output from the port 211d is adjusted. be able to.

In the 90 ° hybrid coupler 211, the phase of the signal input to the port 211a is shifted by 90 ° (one quarter wavelength of the input signal) and output from the port 211d. The capacitances of the variable capacitors 212 and 213 are adjusted according to the frequency of the input signal input to the input terminal 20 so that the passing phase becomes 90 °.

Next, the operation of the amplifying apparatus 200 of this embodiment will be described.

In this embodiment, the input signal input to the input terminal 20 is input to the carrier amplifier 120 and the 90 ° hybrid coupler 211.

The 90 ° hybrid coupler 211 shifts the phase of the signal input to the port 211a and outputs it from the port 211d. Here, as described above, since the passing phase of the 90 ° hybrid coupler 211 is adjusted to be 90 °, the hybrid coupler 211 shifts the phase of the input signal by 90 ° and inputs it to the peak amplifier 130. .

Therefore, also in the amplifying apparatus 200 of the present embodiment, as in the amplifying apparatus 100 of the first embodiment, the phase difference between the signal input to the carrier amplifier 120 and the signal input to the peak amplifier 130 is −90 °. It becomes.

In addition, since the following operation | movement is the same as that of the electric power apparatus 100 of 1st Embodiment, description is abbreviate | omitted.

As described above, according to the present embodiment, the amplifying apparatus 200 includes the third phase adjusting unit 210 that shifts the phase of the input signal and inputs the phase of the input signal to the peak amplifier 130 so that the phase shift amount can be adjusted.

Therefore, regardless of the frequency of the input signal, the phase shift amount by the third phase adjustment unit 210 is adjusted to 90 ° (for ¼ wavelength of the input signal), so that it is input to the carrier amplifier 120. And the phase difference between the signal input to the peak amplifier 130 can be kept constant (−90 °).

(Third embodiment)
FIG. 4 is a block diagram showing a configuration of an amplifying apparatus 300 according to the third embodiment of the present invention. In FIG. 4, the same components as those in FIG.

The amplifying apparatus 300 of the present embodiment is different from the amplifying apparatus 200 of the second embodiment in that the

variable capacitors

142, 143, 152, 153, 212, and 213 are deleted, and the variable capacitance diodes 301, 302, The difference is that 303, 304, 305, and 306 are added.

The variable capacitance diode 301 has one end connected to the port 141b of the 90 ° hybrid coupler 141 and the other end grounded. The variable capacitance diode 301 is an example of a first variable capacitance element.

The variable capacitance diode 302 has one end connected to the port 141c of the 90 ° hybrid coupler 141 and the other end grounded. The variable capacitance diode 302 is an example of a second variable capacitance element.

The variable capacitance diode 303 has one end connected to the port 151b of the 90 ° hybrid coupler 151 and the other end grounded. The variable capacitance diode 303 is an example of a third variable capacitance element.

The variable capacitance diode 304 has one end connected to the port 151c of the 90 ° hybrid coupler 151 and the other end grounded. The variable capacitance diode 304 is an example of a fourth variable capacitance element.

The variable capacitance diode 305 has one end connected to the port 211b of the 90 ° hybrid coupler 211 and the other end grounded. The variable capacitance diode 305 is an example of a fifth variable capacitance element.

The variable capacitance diode 306 has one end connected to the port 211c of the 90 ° hybrid coupler 211 and the other end grounded. The variable capacitance diode 306 is an example of a sixth variable capacitance element.

That is, in the amplifying apparatus 300 of the present embodiment, the variable capacitor in the amplifying apparatus 200 of the second embodiment is replaced with a variable capacity diode.

As described above, even when a variable capacitor is used as the variable capacitor, the first phase adjustment unit 140, the second phase adjustment unit 150, and the third phase adjustment can be performed by changing the capacitance of the variable capacitance capacitor. The phase shift amount by the unit 210 can be adjusted to 90 °, and the amplifying apparatus 300 can be operated with high efficiency.

Although the present embodiment has been described using an example in which the variable capacitor in the amplification device 200 of the second embodiment is replaced with a variable diode, the present invention is not limited to this, and the first embodiment is not limited thereto. The

variable capacitors

142, 143, 152, and 153 in the amplifying device may be replaced with variable capacitors.

In the second and third embodiments, the first phase adjustment unit 140 and the third phase adjustment unit 210 have been described using an example in which the passing phase is 90 °. However, the present invention is not limited to this. is not. The impedance viewed from the carrier amplifier 120 becomes Zout / 2 every 180 °. Therefore, the passing phase of the first phase adjustment unit 140 and the third phase adjustment unit 210 may be 90 ° + 180 ° × n (n is an integer of 0 or more).

(Fourth embodiment)
FIG. 5 is a block diagram showing a configuration of an amplifying apparatus 400 according to the fourth embodiment of the present invention. In FIG. 5, the same components as those in FIG.

The amplifying apparatus 400 of the present embodiment is different from the amplifying apparatus 100 of the first embodiment in that the

variable capacitors

142, 143, 152, and 153 are deleted, and

transmission lines

401, 402, 403, and 404 are added. The point is different.

The transmission line 401 is a transmission line having a characteristic impedance of Zout, one end is connected to the port 141b of the 90 ° hybrid coupler 141, and the other end is open.

The transmission line 402 is a transmission line having a characteristic impedance of Zout, one end is connected to the port 141c of the 90 ° hybrid coupler 141, and the other end is open.

The transmission line 403 is a transmission line having a characteristic impedance √ ((Zout ^ 2) / 2), one end is connected to the port 151b of the 90 ° hybrid coupler 151, and the other end is open.

The transmission line 404 is a transmission line having a characteristic impedance √ ((Zout ^ 2) / 2), one end is connected to the port 151c of the 90 ° hybrid coupler 151, and the other end is opened.

As described above, the transmission lines 401 to 404 have one end connected to the 90 ° hybrid coupler and the other end opened, and operate as an open stub.

That is, in the amplifying apparatus 400 of the present embodiment, the variable capacitor in the amplifying apparatus 100 of the first embodiment is replaced with a transmission line that is an open stub.

Here, the lengths of the transmission lines 401 to 404 in this embodiment can be adjusted.

In the first phase adjustment unit 140, for example, if the length of the

transmission lines

401 and 402 is 0, the signal input from the port 141a is totally reflected at the reflection phase of 0 ° at the port 141b and the port 141c. Output from port 141d. For example, if the lengths of the

transmission lines

401 and 402 are ¼ wavelength of the wavelength of the input signal, the signal input from the port 141a has a reflection phase of 180 ° at the port 141b and the port 141c. The light is totally reflected and output from the port 141d.

Thus, by changing the lengths of the

transmission lines

401 and 402, the phase shift amount of the signal that is input from the port 141a, passes through the 90 ° hybrid coupler 141, and is output from the port 141d is adjusted. be able to.

In the first phase adjustment unit 140, the phase of the signal input to the port 141a is shifted by 90 ° (for ¼ wavelength of the input signal) and output from the port 141d, that is, the 90 ° hybrid coupler 141. The lengths of the

transmission lines

401 and 402 are adjusted according to the frequency of the input signal input to the input terminal 20 so that the transmission phase of the transmission line becomes 90 °.

In the second phase adjustment unit 150, for example, if the lengths of the

transmission lines

403 and 404 are set to 0, the signal input from the port 151a is totally reflected at the reflection phase of 0 ° at the port 151b and the port 151c. And output from the port 151d. For example, if the lengths of the

transmission lines

403 and 404 are ¼ wavelength of the wavelength of the input signal, the signal input from the port 151a has a reflection phase of 180 ° at the port 151b and the port 151c. The light is totally reflected and output from the port 151d.

Thus, by changing the lengths of the

transmission lines

403 and 404, the phase shift amount of the signal input from the port 151a, passing through the 90 ° hybrid coupler 151, and output from the port 151d is adjusted. be able to.

In the second phase adjustment unit 150, the phase of the signal input to the port 151a is shifted by 90 ° (a quarter wavelength of the input signal) and output from the port 151d, that is, the 90 ° hybrid coupler 151. The lengths of the

transmission lines

403 and 404 are adjusted according to the frequency of the input signal input to the input terminal 20 so that the transmission phase of the transmission line becomes 90 °.

In addition, for example, the transmission line is composed of a plurality of microstrip lines and a plurality of switches connecting them, and the length of the transmission line can be adjusted by controlling on / off of each of the plurality of switches. it can.

Next, the operation of the amplification device 400 of this embodiment will be described. Note that a description of operations similar to those of the amplification device 100 of the first embodiment is omitted.

When a signal is output from the carrier amplifier 120, the first phase adjustment unit 140 shifts the phase of the signal by the passing phase of the 90 ° hybrid coupler 141 and outputs the signal.

As described above, the lengths of the

transmission lines

401 and 402 are adjusted so that the passing phase of the 90 ° hybrid coupler 141 is 90 °. Therefore, the first phase adjustment unit 140 shifts the phase of the signal output from the carrier amplifier 120 by 90 ° and outputs the signal.

As described above, the lengths of the

transmission lines

403 and 404 are adjusted so that the passing phase of the 90 ° hybrid coupler 151 is 90 °. Therefore, the second phase adjustment unit 150 shifts the phase of the signal at the connection point 170 by 90 ° and outputs the result to the output terminal 30.

Here, an output load having an impedance of Zout is connected to the output terminal 30, and the passing phase of the 90 ° hybrid coupler 151 is adjusted to 90 ° (the electrical length is adjusted to ¼ wavelength of the input signal). ), The impedance viewed from the connection point 170 is Zout / 2.

Also, when the peak amplifier 130 is off (no signal is amplified), the impedance when the peak amplifier 130 is viewed from the connection point 170 is open. At this time, if the passing phase of the 90 ° hybrid coupler 141 is adjusted to 90 ° (when the electrical length is adjusted to ¼ wavelength of the input signal), the 90 ° hybrid as viewed from the carrier amplifier 120. The impedance in anticipation of the coupler 141 is Zout × 2.

On the other hand, when the peak amplifier 130 is on (amplifies the signal), the load impedance viewed from the connection point 170 in consideration of the hybrid coupler 151 is Zout / 2. Therefore, each of the carrier amplifier 120 and the peak amplifier 130 operates with a load of Zout.

Thus, in the amplifying apparatus 400 according to the present embodiment, the variable capacitor in the amplifying apparatus 100 according to the first embodiment is replaced with a transmission line (open stub) whose length can be changed.

As described above, even when a transmission line whose length can be changed is used instead of the variable capacitance element, the first phase adjustment unit 140 and the second phase adjustment can be performed by changing the length of the transmission line. By adjusting the phase shift amount of the unit 150 and the third phase adjustment unit 210 to 90 °, the amplification device 400 can be operated with high efficiency.

Although the present embodiment has been described using an example in which the variable capacitor in the amplification device 100 of the first embodiment is replaced with a transmission line, the present invention is not limited to this, and the amplification of the second embodiment The

variable capacitance capacitors

142, 143, 152, 153, 212, and 213 in the device 200 may be replaced with transmission lines whose lengths can be changed, and the variable capacitance diode 301 in the amplification device 300 of the third embodiment. ˜306 may be replaced with a transmission line whose length can be changed.

(Fifth embodiment)
FIG. 6 is a block diagram showing a configuration of an amplifying apparatus 500 according to the fifth embodiment of the present invention. In FIG. 6, the same components as those in FIG.

The amplifying apparatus 500 according to the present embodiment is different from the amplifying apparatus 100 according to the first embodiment in that the

variable capacitors

142, 143, 152, and 153 are deleted, and

transmission lines

501, 502, 503, and 504 are added. The point is different.

The transmission line 501 is a transmission line having a characteristic impedance of Zout, and one end thereof is connected to the port 141b of the 90 ° hybrid coupler 141.

The transmission line 502 is a transmission line having a characteristic impedance of Zout, and one end thereof is connected to the port 141c of the 90 ° hybrid coupler 141.

The transmission line 503 is a transmission line having a characteristic impedance √ ((Zout ^ 2) / 2), and one end thereof is connected to the port 151b of the 90 ° hybrid coupler 151.

The transmission line 504 is a transmission line having a characteristic impedance √ ((Zout ^ 2) / 2), and one end thereof is connected to the port 151c of the 90 ° hybrid coupler 151.

Also, the transmission lines 501 to 504 can adjust the grounding position (the length from one end connected to the 90 ° hybrid coupler to the grounding position). Accordingly, the transmission lines 501 to 504 operate as short stubs having one end connected to the 90 ° hybrid coupler and the other end grounded.

That is, in the amplifying apparatus 500 of the present embodiment, the variable capacitor in the amplifying apparatus 100 of the first embodiment is replaced with a transmission line that is a short stub.

In the first phase adjustment unit 140, for example, if the length from one end of each of the

transmission lines

501 and 502 to the ground position is 0, the signal input from the port 141a has a reflection phase at the port 141b and the port 141c. The light is totally reflected at 180 ° and output from the port 141d. Also, for example, if the length from one end of each of the

transmission lines

501 and 502 to the ground position is a length corresponding to ¼ wavelength of the wavelength of the input signal, the signal input from the port 141a is sent to the port 141b and the port 141c. When the reflection phase is 0 °, the light is totally reflected and output from the port 141d.

In this way, by changing the length from one end of each of the

transmission lines

501 and 502 to the ground position, the signal input from the port 141a, passes through the 90 ° hybrid coupler 141, and is output from the port 141d. The amount of phase shift can be adjusted.

transmission lines

501 and 502 are adjusted according to the frequency of the input signal input to the input terminal 20 so that the transmission phase of the transmission line becomes 90 °.

In the second phase adjustment unit 150, for example, if the length from one end of each of the

transmission lines

503 and 504 to the ground position is 0, the signal input from the port 151a is reflected by the port 151b and the port 151c. The phase is totally reflected at 180 ° and output from the port 151d. Further, for example, if the length from one end of each of the

transmission lines

503 and 504 to the ground position is a length corresponding to ¼ wavelength of the wavelength of the input signal, the signal input from the port 151a is transmitted to the port 151b and the port 151c. When the reflection phase is 0 °, the light is totally reflected and output from the port 151d.

Thus, by changing the length from one end of each of the

transmission lines

503 and 504 to the ground position, the signal input from the port 151a, passing through the 90 ° hybrid coupler 151, and output from the port 151d The phase can be adjusted.

transmission lines

503 and 504 are adjusted according to the frequency of the input signal input to the input terminal 20 so that the transmission phase of the transmission line becomes 90 °.

In addition, for example, the transmission line can be slid along the length direction of the microstrip line and the microstrip line, and the transmission line is configured by a short bar grounded, and the position of the short bar is controlled. The length from one end of the transmission line connected to the 90 ° hybrid coupler to the grounding position can be adjusted.

Next, the operation of the amplification device 500 of this embodiment will be described. Note that a description of operations similar to those of the amplification device 100 of the first embodiment is omitted.

As described above, the length from one end of each of the

transmission lines

501 and 502 to the ground position is adjusted so that the passing phase of the 90 ° hybrid coupler 141 is 90 °. Therefore, the first phase adjustment unit 140 shifts the phase of the signal output from the carrier amplifier 120 by 90 ° and outputs the signal.

As described above, the length from one end of each of the

transmission lines

503 and 504 to the ground position is adjusted so that the passing phase of the 90 ° hybrid coupler 151 is 90 °. Therefore, the second phase adjustment unit 150 shifts the phase of the signal at the connection point 170 by 90 ° and outputs the result to the output terminal 30.

On the other hand, when the peak amplifier 130 is turned on (when a signal is amplified), the load impedance viewed from the connection point 170 in view of the hybrid coupler 151 is Zout / 2. Therefore, each of the carrier amplifier 120 and the peak amplifier 130 operates with a load of Zout.

Thus, in the amplifying apparatus 500 of this embodiment, the length from the one end where the variable capacitor in the amplifying apparatus 100 of the first embodiment is connected to the port of the 90 ° hybrid coupler to the ground position can be changed. It has been replaced with a simple transmission line (short stub).

As described above, even when a transmission line capable of changing the ground position is used instead of the variable capacitance element, the phase shift amount by the first phase adjustment unit 140 and the second phase adjustment unit 150 is set to 90 °. Thus, the amplification device 500 can be operated with high efficiency.

variable capacitors

142, 143, 152, 153, 212, and 213 in the device may be replaced with transmission lines whose ground positions can be changed, and the variable capacitance diodes 301 to 306 in the amplifying device of the third embodiment. May be replaced with a transmission line whose grounding position can be changed.

In the first to fifth embodiments described above, the passing phase of the second phase adjustment unit 150 has been described using an example of 90 °. However, the present invention is not limited to this. The impedance when the hybrid coupler 151 is viewed from the connection point 170 becomes Zout / 2 every 180 °. Therefore, the passing phase of the second phase adjustment unit 150 may be 90 ° + 180 ° × n (n is an integer of 0 or more).

As mentioned above, although this invention was demonstrated with reference to embodiment, this invention is not limited to the said embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

Some or all of the above embodiments may be described as in the following supplementary notes, but are not limited to the following.

(Appendix 1)
An amplification device that amplifies an input signal input to an input terminal and outputs the amplified signal from an output terminal,
A first amplifier for amplifying the input signal;
A second amplifier for amplifying a peak component of the input signal;
A first phase adjustment unit connected to the output of the first amplifier, shifting and outputting the phase of the signal amplified by the first amplifier, and capable of adjusting the amount of phase shift;
A second phase adjustment capable of shifting the phase of the signal output from the first phase adjustment unit and the signal output from the second amplifier to output to the output terminal and adjusting the phase shift amount And an amplifying device.

(Appendix 2)
In the amplification device according to attachment 1,
The first phase adjustment unit includes:
First and second variable capacitance elements;
A first port connected to the output of the first amplifier, a second port connected to the first variable capacitance element, and a third port connected to the second variable capacitance element; A fourth port connected to the connection point, and a first 90 ° hybrid coupler comprising:
The second phase adjustment unit includes:
Third and fourth variable capacitance elements;
A fifth port connected to the connection point; a sixth port connected to the third variable capacitance element; a seventh port connected to the fourth variable capacitance element; and the output terminal. And an eighth port connected to the second 90 ° hybrid coupler.

(Appendix 3)
In the amplification device according to attachment 1 or 2,
An amplifying apparatus, further comprising: a third phase control unit that shifts the phase of the input signal and outputs the shifted signal to the second amplifier so that the phase shift amount can be adjusted.

(Appendix 4)
In the amplification device according to attachment 3,
The third phase adjustment unit includes:
Fifth and sixth variable capacitance elements;
A ninth port connected to the input terminal; a tenth port connected to the fifth variable capacitance element; an eleventh port connected to the sixth variable capacitance element; and the second port. A third 90 ° hybrid coupler comprising a twelfth port connected to the input of the amplifier.

(Appendix 5)
In the amplification device according to any one of appendices 1 to 4,
The amplifying apparatus, wherein the variable capacitance element is a variable capacitance capacitor.

(Appendix 6)
In the amplification device according to any one of appendices 1 to 4,
The amplifying apparatus, wherein the variable capacitance element is a variable capacitance diode.

(Appendix 7)
In the amplification device according to attachment 1,
The first phase adjustment unit includes:
First and second transmission lines;
A first port connected to the output of the first amplifier; a second port connected to one end of the first transmission line; and a third port connected to one end of the second transmission line. A first 90 ° hybrid coupler comprising a port and a fourth port connected to the connection point;
The second phase adjustment unit includes:
Third and fourth transmission lines;
A fifth port connected to the connection point; a sixth port connected to one end of the third transmission line; a seventh port connected to one end of the fourth transmission line; An eighth port connected to the output terminal, and a second 90 ° hybrid coupler comprising:
Each of the first to fourth transmission lines is an open stub with the other end open, and the length is adjustable.

(Appendix 8)
In the amplification device according to attachment 1,
The first phase adjustment unit includes:
First and second transmission lines;
A first port connected to the output of the first amplifier; a second port connected to one end of the first transmission line; and a third port connected to one end of the second transmission line. A first 90 ° hybrid coupler comprising a port and a fourth port connected to the connection point;
The second phase adjustment unit includes:
Third and fourth transmission lines;
A fifth port connected to the connection point; a sixth port connected to one end of the third transmission line; a seventh port connected to one end of the fourth transmission line; An eighth port connected to the output terminal, and a second 90 ° hybrid coupler comprising:
Each of the first to fourth transmission lines is a short stub, and the grounding position can be adjusted.

Claims

An amplification device that amplifies an input signal input to an input terminal and outputs the amplified signal from an output terminal,
A first amplifier for amplifying the input signal;
A second amplifier for amplifying a peak component of the input signal;
A first phase adjustment unit connected to the output of the first amplifier, shifting and outputting the phase of the signal amplified by the first amplifier, and capable of adjusting the amount of phase shift;
A second phase adjustment capable of shifting the phase of the signal output from the first phase adjustment unit and the signal output from the second amplifier to output to the output terminal and adjusting the phase shift amount And an amplifying device.
The amplification device according to claim 1,
The first phase adjustment unit includes:
First and second variable capacitance elements;
A first port connected to the output of the first amplifier, a second port connected to the first variable capacitance element, and a third port connected to the second variable capacitance element; A fourth port connected to the connection point, and a first 90 ° hybrid coupler comprising:
The second phase adjustment unit includes:
Third and fourth variable capacitance elements;
A fifth port connected to the connection point; a sixth port connected to the third variable capacitance element; a seventh port connected to the fourth variable capacitance element; and the output terminal. And an eighth port connected to the second 90 ° hybrid coupler.
The amplification device according to claim 1 or 2,
An amplifying apparatus, further comprising: a third phase control unit that shifts the phase of the input signal and outputs the shifted signal to the second amplifier so that the phase shift amount can be adjusted.
The amplification device according to claim 3, wherein
The third phase adjustment unit includes:
Fifth and sixth variable capacitance elements;
A ninth port connected to the input terminal; a tenth port connected to the fifth variable capacitance element; an eleventh port connected to the sixth variable capacitance element; and the second port. A third 90 ° hybrid coupler comprising a twelfth port connected to the input of the amplifier.
The amplification device according to any one of claims 1 to 4,
The amplifying apparatus, wherein the variable capacitance element is a variable capacitance capacitor.
The amplification device according to any one of claims 1 to 4,
The amplifying apparatus, wherein the variable capacitance element is a variable capacitance diode.
The amplification device according to claim 1,
The first phase adjustment unit includes:
First and second transmission lines;
A first port connected to the output of the first amplifier; a second port connected to one end of the first transmission line; and a third port connected to one end of the second transmission line. A first 90 ° hybrid coupler comprising a port and a fourth port connected to the connection point;
The second phase adjustment unit includes:
Third and fourth transmission lines;
A fifth port connected to the connection point; a sixth port connected to one end of the third transmission line; a seventh port connected to one end of the fourth transmission line; An eighth port connected to the output terminal, and a second 90 ° hybrid coupler comprising:
Each of the first to fourth transmission lines is an open stub with the other end open, and the length is adjustable.
The amplification device according to claim 1,
The first phase adjustment unit includes:
First and second transmission lines;
A first port connected to the output of the first amplifier; a second port connected to one end of the first transmission line; and a third port connected to one end of the second transmission line. A first 90 ° hybrid coupler comprising a port and a fourth port connected to the connection point;
The second phase adjustment unit includes:
Third and fourth transmission lines;
A fifth port connected to the connection point; a sixth port connected to one end of the third transmission line; a seventh port connected to one end of the fourth transmission line; An eighth port connected to the output terminal, and a second 90 ° hybrid coupler comprising:
Each of the first to fourth transmission lines is a short stub, and the grounding position can be adjusted.