JP2000236222A - Feedforward amplifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a feedforward amplifier which fully suppresses distortion components away from a channel band and to make small-sized the feedforward amplifier constituted by placing more than one feedforward amplifier in parallel operation. SOLUTION: An auxiliary amplifier is constituted by a 1st auxiliary amplifier 16, which amplifies a distortion component generated below the channel band and a 2nd auxiliary amplifier 17 which amplifies a distortion component generated above the channel band in parallel operation to widen the operation band of the feedforward amplifier. A feedforward amplifier (200), constituted by placing amplifier blocks (37a and 37b) in parallel operation, uses an auxiliary amplifier 36 in common to make the feedforward amplifier small-sized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feedforward amplifier mainly used for a base station device of a mobile communication device.

[0002]

2. Description of the Related Art In recent years, a base station apparatus of a mobile communication apparatus has used a high-output linear power amplifier which compensates for distortion by a feedforward system.

FIG. 7 is a diagram showing an example of the configuration of a conventional feedforward amplifier. As shown in the figure, in the feedforward amplifier 600, the input terminal 1 is a means for inputting a signal from outside the feedforward amplifier 600. The output terminal 2 is a means for outputting a signal from the feedforward amplifier 600 to the outside. The power divider 3 is means for dividing the input from the input terminal 1 into two and outputting the divided signal to the vector adjuster 5 and the delay circuit 7. The main amplifier 6 is means for amplifying the input from the vector adjuster 5. The distortion removing power combiner 8 is means for receiving the inputs of the main amplifier 6 and the delay circuit 7 and outputting the signals to the delay circuit 9 and the vector adjuster 33. Auxiliary amplifier 7
A unit 1 amplifies the input from the vector adjuster 33. The distortion removing power combiner 4 is means for combining inputs from the delay circuit 9 and the auxiliary amplifier and outputting the combined result to the output terminal 2. However, the power distributor 3, the distortion removing power combiner 4
Symbols a to j attached to the distortion detecting power combiner 8 indicate input / output ports of signals of the respective means.

[0004] The operation of the conventional feedforward amplifier configured as described above will be described below.

First, an input signal including a multi-channel component input from an input terminal 1 is split into two by a power splitter 3. One of the two divided signals is amplified by the main amplifier 6 via the vector adjuster 5, and the amplified signal is supplied to the distortion detection power combiner 8
Is input to the input port d. At this time, due to the nonlinearity of the main amplifier 6, a signal containing a distortion component due to intermodulation in addition to the input signal component is input to the distortion detection power combiner 8.

The other of the two signals is passed through a delay circuit 7 to an input port e of a distortion detecting power combiner 8.
Is input to Here, the vector adjuster 5, the delay circuit 7, and the distortion detection power combiner 8 are adjusted so that the input signal components of the signals input to the input ports d and e have the same amplitude and opposite phases. Thus, the output port g outputs a signal of only the distortion component in which the input signal component has been canceled.

Next, the signal including the input signal component and the distortion component output from the output port f is input to the input port h of the distortion removal power combiner 4 via the delay circuit 9.

The signal of the distortion component output from the output port g is passed through the vector adjuster 33 to the auxiliary amplifier 7.
After being amplified by 1, the signal is input to the input port i of the distortion removal power combiner 4. Here, by adjusting the vector adjuster 33, the delay circuit 9, and the distortion removing power combiner 4 so that the distortion components of the signals input to the input port h and the input port i have equal amplitudes and opposite phases. From the output terminal 2, it is possible to obtain a signal of only the input signal component in which the distortion component has been canceled.

Next, FIG. 8 is a diagram showing a configuration of a feedforward amplifier in which two feedforward amplifiers 600 shown in FIG. 7 are operated in parallel. As shown in the figure,
In this feedforward amplifier 700, the same reference numerals as those in FIG. 7 denote the same parts, and the input distributor 31 converts the input from the input terminal 1 into a first feedforward amplifier circuit 81a.
And the second feedforward amplifier circuit 81b. Output combiner 3
Reference numeral 2 denotes a unit that combines the inputs from the first feedforward amplifier circuit 81a and the second feedforward amplifier circuit 81b and outputs the result to the output terminal 2.

A second example of the feedforward amplifier according to the prior art configured as described above will be described below.
The operation will be described.

First, an input signal containing a multi-channel component input from the input terminal 1 is split into two by a power splitter 31. One of the two divided signals is linearly amplified by the first feedforward amplifier circuit 81a.

The other signal divided into two is linearly amplified by a second feedforward amplifier circuit 81b.
The output signal of the first feedforward amplifier circuit 81a and the power combiner 32 are combined and output from the output terminal 2.

According to the feedforward amplifier 700 having the configuration shown in FIG. 8, even if a failure occurs in one of the feedforward amplifier circuits, the output power of the feedforward amplifier as a whole decreases, but And the reliability of the feedforward amplifier is improved.

[0014]

However, in the configuration of FIG. 7, in order to suppress the distortion component generated in the main amplifier 6 over a wide band, it is necessary to widen the band of the auxiliary amplifier 71. Actually, it is difficult to make the amplitude and phase characteristics of the auxiliary amplifier 71 flat over a wide band. Therefore, distortion components occurring very close to the channel band can be sufficiently suppressed. It was difficult.

Further, the configuration in which two feedforward amplifier circuits shown in FIG. 8 are operated in parallel has a problem that the circuit scale becomes large.

In order to solve the above-mentioned problems, in the present invention, the auxiliary amplifier is provided with a first auxiliary amplifier for amplifying a distortion component generated on the lower side of the channel band, and an auxiliary amplifier on the higher side of the channel band. By using a configuration in which the second auxiliary amplifier for amplifying the distortion component is operated in parallel, the bandwidth of the feedforward amplifier can be widened.

In a feedforward amplifier in which a plurality of feedforward amplifier circuits are operated in parallel, the feedforward amplifier can be miniaturized by using a common auxiliary amplifier for each feedforward amplifier circuit.

[0018]

In order to achieve the above object, a first invention (corresponding to claim 1) comprises a first power divider for dividing an input signal into two, and a first power divider for dividing the input signal into two. A first vector adjuster for adjusting an amplitude and a phase of one output signal of the power divider; a main amplifier for amplifying an output signal of the first vector adjuster; A first delay circuit for delaying an output signal, an output signal of the main amplifier and an output signal of the first delay circuit,
Distortion detection power having a first output port for outputting an output signal of the main amplifier, and a second output port for outputting a composite signal of the output signal of the main amplifier and the output signal of the first delay circuit A combiner, a second delay circuit for delaying an output signal of a first output port of the distortion detecting power combiner, and an auxiliary for amplifying an output signal of a second output port of the distortion detecting power combiner. An amplifier block, a feedforward amplifier including a distortion removal power combiner that outputs a combined signal of an output signal of the second delay circuit and an output signal of the auxiliary amplifier block, wherein the auxiliary amplifier block includes: Broadband auxiliary amplifier having at least two auxiliary amplifiers for amplifying an output signal from a second output port of the distortion detecting power combiner for each frequency band that does not overlap each other A feedforward amplifier which is a block.

The second invention (corresponding to claim 2)
A power divider for dividing the input signal from the distortion detection power combiner into two, a low-pass filter for passing a low-frequency component of one output signal of the power divider, A first vector adjuster for adjusting the amplitude and phase of the output signal of the low-pass filter;
A first auxiliary amplifier for amplifying an output signal of the first vector adjuster, a high-pass filter for passing a high-frequency component of the other output signal of the power divider, and an output signal of the high-pass filter Vector adjuster for adjusting the amplitude and phase of the signal, a second auxiliary amplifier for amplifying an output signal of the second vector adjuster, an output signal of the first auxiliary amplifier, and a second auxiliary amplifier 2. The feedforward amplifier according to claim 1, further comprising a power combiner that outputs a combined signal with the output signal of (b) to the power combiner for distortion removal. 3.

Further, the third invention (corresponding to claim 3)
A first power divider for dividing an input signal into two, a first vector adjuster for adjusting an amplitude and a phase of one output signal of the first power divider, and the first vector adjuster A main amplifier for amplifying the output signal of the first power divider, a first delay circuit for delaying the other output signal of the first power divider,
A first input circuit that receives an output signal of the main amplifier and an output signal of the first delay circuit and outputs an output signal of the main amplifier;
And a second output port for outputting a composite signal of an output signal of the main amplifier and an output signal of the first delay circuit; and a power detector for distortion detection. Delaying the output signal of the first output port of the second
A delay circuit, and two input ports, for inputting an output signal of the second delay circuit to a first input port, combining the output signal with a signal input to a second input port, and outputting the resultant signal. At least two amplifier blocks having a power combiner; an input divider providing the input signal to each of the first power dividers of the at least two amplifier blocks; and an input divider of the at least two amplifier blocks. An output combiner for combining and outputting the input of the output signal of the power combiner for distortion removal, and at least two inputting the output signals of the second output ports of the power combiners for distortion detection of the at least two amplifier blocks. A plurality of third vector adjusters; a power combiner for combining output signals from the at least two third vector adjusters; an auxiliary amplifier for amplifying an output signal of the power combiner; The output signals of the auxiliary amplifiers are distributed according to the number of the at least two amplifier blocks, and input to the second input ports of the distortion canceling power combiners of the at least two amplifier blocks, respectively. A feedforward amplifier comprising a power distributor.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment. (Embodiment 1) FIG. 1 is a configuration diagram of a feedforward amplifier according to Embodiment 1 of the present invention. As shown in the figure, in the feedforward amplifier 100, an input terminal 1 is a means for inputting a signal from outside the feedforward amplifier 100. The output terminal 2 is a means for outputting a signal from the feedforward amplifier 100 to the outside. The power divider 3 is means for dividing the input from the input terminal 1 into two and outputting the divided signal to the vector adjuster 5 and the delay circuit 7. The main amplifier 6 is means for amplifying the input from the vector adjuster 5. The distortion removing power combiner 8 is a means for receiving the inputs of the main amplifier 6 and the delay circuit 7 and outputting them to the delay circuit 9 and the wide band auxiliary amplifier block 18.
The distortion removing power combiner 4 is means for combining the inputs from the delay circuit 9 and the broadband auxiliary amplifier block 18 and outputting the combined signal to the output terminal 2.

The power divider 3, the vector adjuster 5,
The main amplifier 6, the delay circuit 7, the distortion detecting power combiner 8, the delay circuit 9, and the distortion removing power combiner 4 constitute an amplifier block 1.
9. Here, symbols a to j attached to the power divider 3, the distortion removing power combiner 4, and the distortion detecting power combiner 8 indicate signal input / output ports of each means.

Next, in the wide band auxiliary amplifier block 18, the power divider 10 distributes the input from the output port g of the distortion detecting power combiner 8 and outputs the same to the low-pass filter 12 and the high-pass filter 13. It is a means to do. The low-pass filter 12 is means for passing only low-frequency components of the input signal.
Reference numeral 3 denotes a means for passing only a high frequency component of the input signal. The vector adjusters 14 and 15 are means for performing the same operation as in the related art. Auxiliary amplifier 16
And 17 are means for amplifying the distortion component. The power combiner 11 is a means for combining the inputs from the auxiliary amplifiers 16 and 17 and outputting the combined result to the input port i of the distortion removing power combiner 4. However, the vector adjusters 14 and 15
The symbols m and n attached to indicate the signal input ports.

The operation of the feedforward amplifier configured as described above will be described below with reference to the drawings.

First, an input signal including a multi-channel component input from the input terminal 1 is split into two by the power splitter 3. One of the two divided signals is amplified by the main amplifier 6 via the vector adjuster 5, and the amplified signal is supplied to the distortion detection power combiner 8
Is input to the input port d. At this time, a signal containing a distortion component due to intermodulation in addition to the input signal component due to the non-linearity of the main amplifier 6 is input. The other of the two signals is input to the input port e of the distortion detection power combiner 8 via the delay circuit 7. Here, the vector adjuster 5, the delay circuit 7, and the distortion detection power combiner 8 are adjusted so that the input signal components of the signals input to the input ports d and e have the same amplitude and opposite phases. As a result, a signal including only the distortion component in which the input signal component has been canceled is output from the output port g.

Next, the signal including the input signal component and the distortion component output from the output port f is input to the input port h of the distortion removal power combiner 4 via the delay circuit 9. The signal of the distortion component output from the output port g is split into two by the power splitter 10.

One of the two divided signals passes through the low-pass filter 12 so that only the distortion component on the lower side of the channel band passes, and passes through the vector adjuster 14 to the auxiliary amplifier 1.
Amplified at 6. On the other hand, only the distortion component on the higher frequency side than the channel band passes through the high-pass filter 13 and the other signal divided into two is amplified by the auxiliary amplifier 17 via the vector adjuster 15. The output signals of the auxiliary amplifiers 16 and 17 are combined by the power combiner 11 and input to the input port i of the distortion removing power combiner 4. Here, input port h
By adjusting the vector adjusters 14 and 15, the delay circuit 9 and the distortion removing power combiner 4 so that the distortion components of the signal input to the input port i are equal in amplitude and opposite in phase, the distortion is removed. From the output port j of the power combiner 4 to the output terminal 2, a signal of only the input signal component in which the distortion component has been canceled is output.

Next, FIGS. 2A to 2F are diagrams showing frequency spectra of signals at the input / output ports a, d, g, m, n, and j of each section shown in FIG.

As described above, according to the feedforward amplifier of the first embodiment, the auxiliary amplifier 16 amplifies the distortion component on the lower side of the channel band, and the auxiliary amplifier 17 uses the distortion component on the higher side of the channel band. Is amplified, the operation range of the feedforward amplifier can be improved over a wide band, as compared with the case where a single auxiliary amplifier amplifies the distortion component in the entire band as in the conventional feedforward amplifier.

In the first embodiment, the configuration of the wideband auxiliary amplifier block has been described on the assumption that the distortion component of the input signal is divided into two frequency bands and the distortion component is amplified by the two auxiliary amplifiers. However, by providing three or more pass filters, the distortion component may be divided into three or more frequency bands, and the distortion component may be amplified by three or more auxiliary amplifiers. The operating range can be further widened. (Embodiment 2) FIG. 3 is a configuration diagram of a feedforward amplifier according to Embodiment 2 of the present invention. As shown in the figure, in the feedforward amplifier 200, the input terminal 1 is a means for inputting a signal from outside the feedforward amplifier 200. The output terminal 2 is a means for outputting a signal from the feedforward amplifier 200 to the outside. The input distributor 31 distributes the power from the input terminal 1 according to the number of amplifier blocks, and outputs the input to the first amplifier block 37a and the second amplifier block 37b. Output combiner 32
Is means for combining the outputs from the first amplifier block 37a and the second amplifier block 37b and outputting the combined output to the output terminal 2.

Next, in the first amplifier block 37a and the second amplifier block 37b, the power distributor 3
Reference numerals a and 3b denote means for dividing the input from the input distributor 31 into two and outputting the divided signals to the vector adjusters 5a and 5b and the delay circuits 7a and 7b, respectively. The main amplifiers 6a and 6b are means for amplifying inputs from the vector adjusters 5a and 5b, respectively. The power combiners 8a and 8b for distortion removal receive the inputs of the main amplifiers 6a and 6b and the delay circuits 7a and 7b, respectively, and receive the delay circuits 9a and 9b and the vector adjuster 33.
a, 33b. The distortion removing power combiners 4a and 4b are means for combining inputs from the delay circuits 9a and 9b and the power distributor 35 and outputting the combined result to the output terminal 2. However, the main amplifiers 6a and 6b have the same characteristics.

The power combiner 34 combines the inputs from the vector adjusters 33a and 33b to form an auxiliary amplifier 3
6 means. The power divider 35 distributes the power of the output from the auxiliary amplifier 36 in accordance with the number of amplifier blocks. The power divider 4a of the first amplifier block 37a and the distortion combiner 4a of the first amplifier block 37b. These are means for outputting to the detection power combiner 4b.

The operation of the feedforward amplifier configured as described above will be described below with reference to the drawings. However, since the individual circuit operations of the first amplifier block 37a and the second amplifier block 37b are the same as those in the first embodiment, the following description will focus on the differences.

First, an input signal containing a multi-channel component input from the input terminal 1 is input to the
Distributed first and second amplifier blocks 37a, 37b
Respectively. The main amplifier 6a of the first amplifier block 37a and the main amplifier 6b of the second amplifier block 37b output signals including distortion components having the same frequency spectrum.

Next, the signals of the distortion components detected by the distortion detectors 8a and 8b are respectively converted into vector adjusters 33a and 33a.
The power is combined by the power combiner 34 via 33b. The signal of the distortion component synthesized by the power synthesizer 34 is
, And is divided into two by the power divider 35. The two-divided signal of the distortion component is supplied to the distortion removing power combiners 4a and 4a.
b and are combined with output signals from the delay circuits 9a and 9b. Further, the power combiners 4a and 4b for distortion removal
Are output from the output terminal 2 after being synthesized by the output synthesizer 32.

As described above, according to the feedforward amplifier of the second embodiment of the present invention, by using a common auxiliary amplifier for amplifying a distortion component signal, the conventional structure shown in FIG. The circuit can be downsized as compared with the feedforward amplifier.

Although the second embodiment has been described with reference to a configuration example using two amplifier blocks, three or more amplifier blocks may be used. In that case, the required number of vector adjusters provided between the second output port of the power detector for distortion detection of the amplifier block and the power combiner 34 may be added.

In the second embodiment, the main amplifier 6a
And 6b have been described as amplifiers having the same characteristics, but amplifiers having different power levels but equal characteristics in the frequency spectrum of distortion components may be used.

It is apparent that the operation range of the feedforward amplifier can be improved over a wide band by configuring the auxiliary amplifier 36 of the second embodiment with the wide band auxiliary amplifier block 18 of the first embodiment. It is. (Embodiment 3) FIG. 4 is a configuration diagram of a feedforward amplifier according to Embodiment 3 of the present invention. As shown in the figure, in the feedforward amplifier 300, the same reference numerals as those in the second embodiment denote the same parts. The power distributor 41 is means for outputting an input from the input distributor 31 to the first main amplifier basic block 50a and the second main amplifier basic block 50b. The power combiner 42
This is a unit that combines the inputs from the first main amplifier basic block 50a and the second main amplifier basic block 50b and outputs the resultant to the distortion removal power combiner 49. Further, the distortion detecting power combiner 44, the vector adjuster 46, the distortion detecting amplifier 47, and the delay circuit 48 are all the same units having the same names described in the second embodiment. Distortion removal power combiner 4
Reference numeral 9 denotes a unit that combines inputs from the power combiner 42 and the auxiliary amplifier 36 and outputs the combined result to the output terminal 2.

Next, the first main amplifier basic block 50
a, the second main amplifier basic block 50b includes vector adjusters 45a and 45b, delay circuits 5a and 5b, and main amplifiers 6a and 6b, respectively. However, the main amplifiers 6a and 6b and the distortion detecting amplifier 47 are the same amplifier.

The operation of the feedforward amplifier according to the third embodiment configured as described above will be described below with reference to the drawings.

First, an input signal containing a multi-channel component input from the input terminal 1 is input to the
Be distributed.

One signal split into two by the input splitter 31 is further split into two by the power splitter 41, and one signal is amplified by the main amplifier 6a via the vector adjuster 45a and the delay circuit 5a. . The other signal split into two by the power splitter 41 is a vector adjuster 45 b and a delay circuit 5.
The signal is amplified by the main amplifier 6b via the line b. The output signals of the main amplifiers 6a and 6b are combined by the power combiner 42,
The signal is input to the distortion removing power combiner 49.

On the other hand, the other signal split into two by the input splitter 31 is further split into two by the power splitter 43, and one signal is sent to the distortion detecting amplifier 4 via the vector adjuster 46.
Amplified at 7. At this time, by inputting a signal having the same power level as the main amplifiers 6a and 6b to the distortion detection amplifier 47, a signal including a distortion component having the same frequency spectrum as the main amplifiers 6a and 6b is output.

The other signal split into two by the power divider 43 is input to the distortion detecting power combiner 44 via the delay circuit 48 and is combined with the output signal of the distortion detecting amplifier 47. Here, the vector adjuster 46 and the delay circuit 4 are arranged so that the input signal components of both signals have the same amplitude and opposite phases.
8 and the distortion detection power combiner 44, the distortion detection power combiner 44 outputs a signal of only the distortion component in which the input signal component has been canceled. Next, the signal of the distortion component output from the distortion detection power combiner 44 is amplified by the auxiliary amplifier 36 and input to the distortion removal power combiner 49.

In the distortion removing power combiner 49, the signal of the distortion component amplified by the auxiliary amplifier 36 and the power combiner 42
Is synthesized with the output signal. Here, the vector adjuster 45 is adjusted so that the distortion components of both signals have the same amplitude and opposite phases.
a, 45b, the delay circuits 5a, 5b, and the distortion removing power combiner 49 are adjusted so that the distortion removing power combiner 4
9 outputs to the output terminal 2 a signal of only the input signal component in which the distortion component has been canceled.

As described above, according to the feedforward amplifier of the third embodiment, the input signal is divided into two, one signal is amplified by the pair of main amplifier blocks, and the distortion component is extracted from the other signal. Thus, by combining the components just before the output and canceling out the distortion components, the circuit can be downsized and the power loss after the main amplifier is reduced as compared with the conventional feedforward amplifier. Therefore, the operation of the entire feedforward amplifier can be improved in efficiency.

In the third embodiment, the configuration example using two main amplifier basic blocks has been described. However, three or more main amplifier basic blocks may be used. In this case, the efficiency of the feedforward amplifier is further improved. Becomes possible.

In the third embodiment, the main amplifier 6a
And 6b have been described as amplifiers having the same characteristics, but amplifiers having different power levels but having the same characteristic in the frequency spectrum of the distortion component may be used.

In the above case, for example, consider a case where a 150 W output is required for the feedforward amplifier. When using 100W and 50W types as the main amplifier, 1
In the case of a configuration of 00 (W) × 2 (pieces), 200 W is output, so that each of them must be used as 75 W output, which degrades the efficiency as a device. In the case of a configuration of 50 (W) × 3 (pieces), the circuit becomes large. Therefore, 100 (W)
The device can be efficiently used by using the device of 50 (W) and the device of (W).

In the third embodiment, the distortion detecting amplifier 47 and the main amplifiers 6a and 6b have been described as amplifiers having the same characteristics. However, the distortion detecting amplifier 47 has the same power as the main amplifier 6a or 6b. An amplifier having a different level but an equal characteristic of the frequency spectrum of the distortion component may be used. Since the distortion detection power amplifier 47 is not related to the output power of the feedforward amplifier 300, the distortion detection power amplifier 47 obtains the same output as the main amplifiers 6a and 6b in consideration of the efficiency of the entire feedforward amplifier 300. It is inefficient to use such devices. Therefore, by using a low output device by the distortion detection power amplifier, the power consumption of the entire circuit can be reduced and the efficiency can be increased.

It is apparent that the operation range of the feedforward amplifier can be improved over a wide band by configuring the auxiliary amplifier 36 of the third embodiment with the wide band auxiliary amplifier block 18 of the first embodiment. It is. (Embodiment 4) FIG. 5 is a configuration diagram of a feedforward amplifier according to Embodiment 4 of the present invention. As shown, in the feedforward amplifier 400, the same reference numerals as those in the third embodiment denote the same parts. Each of the first distortion removal type main amplifier block 53a and the second distortion removal type main amplifier block 53b processes input from the power distributors 41 and 51 and outputs the processed power to the power combiner 42. is there. In addition, the power distributor 51 includes the auxiliary amplifier 3
Output from the first main amplifier block 53a.
And a means for outputting to the second distortion removal type main amplifier block.

Next, the first distortion removal type main amplifier block 5
3a and the second distortion removal type main amplifier block 53b are respectively provided with vector adjusters 45a and 45b and delay circuits 5a and 5a.
b, main amplifiers 6a, 6b and distortion removing power combiner 52
a and 52b. However, the main amplifier 6
a, 6b and the distortion detecting amplifier 47 are the same amplifier.

The operation of the feedforward amplifier according to the fourth embodiment configured as described above will be described below with reference to the drawings.

Embodiment 4 of the present invention is a feedforward amplifier for canceling distortion components for each main amplifier.
First, an input signal including a multi-channel component input from the input terminal 1 is split into two by an input splitter 31.

One signal split into two by the input splitter 31 is further split into two by the power splitter 41, and one signal is amplified by the main amplifier 6a via the vector adjuster 45a and the delay circuit 5a. . The other signal split into two by the power splitter 41 is a vector adjuster 45 b and a delay circuit 5.
The signal is amplified by the main amplifier 6b via the line b.

On the other hand, the other signal divided into two by the input distributor 31 is subjected to the same processing as in the third embodiment, whereby a signal in which only the distortion component is amplified is output to the auxiliary amplifier 36. . Next, the output signal from the auxiliary amplifier 36 is
The power is split into two by the power splitter 51, one of the signals is sent to the first distortion removal type main amplifier block 53a, and the other is sent to the second
To the main amplifier block 53b.

Further, the distortion removal type main amplifier block 53
a and 53b, one of the two signals divided by the power divider 51 is combined with the output signal of the main amplifier 6a by the distortion removing power combiner 52a, and the other signal is divided by the main amplifier 6a.
The output signal b is combined with the distortion removing power combiner 52b.

Here, the vector adjuster 4 controls the distortion components of the two signals to be combined so that they have the same amplitude and opposite phases.
By adjusting the delay circuits 5a and 45b, the delay circuits 5a and 5b, and the distortion removing power combiners 52a and 52b, the distortion removing power combiners 52a and 52b output signals of only the input signal components in which the distortion components have been cancelled. Is output. Finally, the output signals of the distortion removing power combiners 52a and 52b are combined by the power combiner 42, and the signal is output from the output terminal 2.

As described above, according to the feedforward amplifier of the fourth embodiment, the input signal is divided into two, and one of the signals is amplified by the pair of distortion removal type main amplifier blocks. By canceling the distortion component for each block, the size of the circuit can be reduced as compared with the conventional feedforward amplifier, the loss after the main amplifier can be reduced, and the distortion component can be removed. Accuracy can be improved.

Although the fourth embodiment has been described with reference to a configuration example using two distortion removal type main amplifier blocks, three or more main amplifier blocks may be used.

In the fourth embodiment, the main amplifier 6a
Although the amplifiers 6b and 6b have been described as having the same characteristics, amplifiers having different power levels but equal characteristics in the frequency spectrum of the distortion component may be used.

In the fourth embodiment, the amplifier 47 for distortion detection and the main amplifiers 6a and 6b have been described as amplifiers having the same characteristics.
An amplifier having a power level different from that of a or 6b but having the same characteristics as the frequency spectrum of the distortion component may be used.

Further, the auxiliary amplifier 36 of the fourth embodiment
It is apparent that the operation range of the feedforward amplifier can be improved over a wide band by configuring the wideband auxiliary amplifier block 18 of the first embodiment. (Embodiment 5) FIG. 6 is a configuration diagram of a feedforward amplifier according to Embodiment 5 of the present invention. As shown, in the feedforward amplifier 500, the same reference numerals as those in the second embodiment denote the same parts. The switching type auxiliary amplifier 63 is composed of switch circuits 61 and 62 and auxiliary amplifiers 36a and 36b, and is a means disposed between the power combiner 34 and the power distributor 35. However,
The main amplifiers 6a and 6b are amplifiers having the same characteristics,
The auxiliary amplifiers 36a and 36b have the same characteristics.

The operation of the feedforward amplifier configured as described above will be described below with reference to the drawings.

Embodiment 5 of the present invention is different from Embodiment 2 of the present invention.
Is replaced with a switchable auxiliary amplifier 63, and is the same as the second embodiment except for the circuit operation of the switchable auxiliary amplifier 63.

The switching type auxiliary amplifier 63 is connected to the auxiliary amplifier 36.
The switch circuits 61 and 62 provided before and after a and 36b are simultaneously connected to one of the auxiliary amplifiers. When a failure occurs in the connected auxiliary amplifier, the switch circuit 61,
Switch 62 to connect simultaneously to the other auxiliary amplifier.

As described above, according to the feedforward amplifier of the fifth embodiment, in a feedforward circuit composed of two amplifier blocks having a common auxiliary amplifier, the two auxiliary amplifiers are selectively switched by the switch. With such a configuration, the reliability of the circuit can be improved as compared with the conventional feedforward amplifier.

In the fifth embodiment, the main amplifier 6a
Although the amplifiers 6b and 6b have been described as having the same characteristics, amplifiers having different power levels but equal characteristics in the frequency spectrum of the distortion component may be used.

The auxiliary amplifier 36 of the fifth embodiment
It is obvious that the operation range of the feedforward amplifier can be improved over a wide band by configuring the a and 36b with the wide band auxiliary amplifier block 18 of the first embodiment.

Although the fifth embodiment is a feedforward amplifier in which the auxiliary amplifier 36 of the second embodiment is constituted by the switching auxiliary amplifier 63, the present invention is not limited to the second embodiment, and Regarding any of the auxiliary amplifiers 3 and 4, it is apparent that the reliability of the feedforward amplifier can be improved by configuring the auxiliary amplifier with the switching auxiliary amplifier 63.

[0072]

As is apparent from the above description, according to the present invention, the auxiliary amplifier is provided with a first auxiliary amplifier for amplifying a distortion component generated on the lower side of the channel band and a first auxiliary amplifier on the higher side of the channel band. By using a configuration in which the second auxiliary amplifier that amplifies the generated distortion component is operated in parallel, it is possible to widen the bandwidth of the feedforward amplifier.

Further, according to the present invention, in a feedforward amplifier in which a plurality of feedforward amplifier circuits are operated in parallel, the feedforward amplifier can be downsized by using a common auxiliary amplifier for each feedforward amplifier circuit. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a feedforward amplifier 100 according to a first embodiment of the present invention.

FIG. 2 is a feedforward amplifier 1 according to the first embodiment;
FIG. 9 is a frequency spectrum diagram of signals at input / output ports a, d, g, m, n, and j at 00.

FIG. 3 is a configuration diagram of a feedforward amplifier 200 according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a feedforward amplifier 300 according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a feedforward amplifier 400 according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of a feedforward amplifier 500 according to a fifth embodiment of the present invention.

FIG. 7 shows a conventional feedforward amplifier 6;
FIG.

FIG. 8 shows a feedforward amplifier 7 according to the prior art.
FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Input terminal 2 Output terminal 3, 3a, 3b, 10, 35, 41, 43, 51 Power distributor 4, 4a, 4b, 49, 52a, 52b Strain removal power combiner 5, 5a, 5b, 14, 15 , 33a, 33b, 45
a, 45b, 46 Vector adjusters 6, 6a, 6b Main amplifiers 7, 7a, 7b, 9, 9a, 9b, 48 Delay circuits 8, 8a, 8b, 44 Distortion detecting power combiners 11, 34, 42 Power combiner 12 Low-pass filter 13 High-pass filter 16, 17, 36, 36a, 36b, 71 Auxiliary amplifier 18 Broadband auxiliary amplifier block 19 Amplifier block 31 Input combiner 32 Output combiner 37a First amplifier block 37b Second Amplifier block 47 Distortion detection amplifier 50a First main amplifier basic block 50b Second main amplifier basic block 53a First distortion removal type main amplifier block 53b Second distortion removal type main amplifier block 61, 62 Switch circuit 63 Switching Auxiliary amplifier 81a First feedforward amplifier circuit 81b Second feedforward De amplifier circuit 100,200,300,400,500,600,7
00 feed forward amplifier

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroaki Kosugi 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Shinichi Kusato 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama, Kanagawa Prefecture Matsushita F term (reference) in Communication Industry Co., Ltd. 5J090 AA01 AA41 CA21 CA27 CA62 CA92 FA14 GN02 GN05 GN07 HN17 HN18 KA15 KA16 KA23 KA42 KA46 KA68 MA14 SA14 TA01 TA03

Claims (14)

[Claims] A first power divider that divides an input signal into two; a first vector adjuster that adjusts an amplitude and a phase of one output signal of the first power divider; A main amplifier for amplifying the output signal of the vector adjuster; and a first amplifier for delaying the other output signal of the first power divider.
A first delay circuit that inputs an output signal of the main amplifier and an output signal of the first delay circuit, and outputs an output signal of the main amplifier.
And a second output port for outputting a combined signal of the output signal of the main amplifier and the output signal of the first delay circuit; and the power detector for distortion detection. A second delay circuit for delaying an output signal of the first output port of the second delay circuit; an auxiliary amplifier block for amplifying an output signal of a second output port of the distortion detection power combiner; A feedforward amplifier comprising a distortion removal power combiner that outputs a combined signal of an output signal and an output signal of the auxiliary amplifier block, wherein the auxiliary amplifier block is a second one of the distortion detection power combiner. The output signal from the output port of each of the at least two frequency bands which are not overlapped with each other.
A feedforward amplifier comprising a wideband auxiliary amplifier block having a plurality of auxiliary amplifiers. 2. The wide-band auxiliary amplifier block comprises: a power divider for dividing an input signal from the distortion detection power combiner into two parts; and a low-pass component for passing a low-frequency component of one output signal of the power divider. A first vector adjuster for adjusting an amplitude and a phase of an output signal of the low-pass filter; a first auxiliary amplifier for amplifying an output signal of the first vector adjuster; A high-pass filter that passes a high-frequency component of the other output signal of the filter, a second vector adjuster that adjusts an amplitude and a phase of the output signal of the high-pass filter, A second auxiliary amplifier for amplifying an output signal; and a power combiner for outputting a composite signal of the output signal of the first auxiliary amplifier and the output signal of the second auxiliary amplifier to the distortion removal power combiner. Was Feedforward amplifier according to claim 1, wherein the door. 3. A first power divider for dividing an input signal into two, a first vector adjuster for adjusting an amplitude and a phase of one output signal of the first power divider, and the first power divider; A main amplifier for amplifying the output signal of the vector adjuster; a first delay circuit for delaying the other output signal of the first power divider; an output signal of the main amplifier and an output of the first delay circuit And a second output port for receiving a signal and outputting an output signal of the main amplifier, and a second output port for outputting a combined signal of the output signal of the main amplifier and the output signal of the first delay circuit. And a second delay circuit for delaying an output signal of a first output port of the distortion detecting power combiner, and two input ports. An output signal of the second delay circuit is input to a second input port. At least two amplifier blocks, each having a distortion removal power combiner that combines and outputs the input signal to a signal input to the at least one amplifier block, and the first power divider of the at least two amplifier blocks. An input divider to be provided, an output combiner that combines and outputs an input of an output signal of the distortion combiner power combiner of the at least two amplifier blocks, and a distortion detector power combiner of the at least two amplifier blocks. At least two third vector adjusters for inputting the output signals of the second output ports of the first and second output ports; a power combiner for combining the output signals from the at least two third vector adjusters; An auxiliary amplifier for amplifying an output signal of a combiner; and an output signal of the auxiliary amplifier, the output signal being distributed according to the number of the at least two amplifier blocks, and Second feedforward amplifier, characterized in that a power divider input to the second input port of the distortion removing power combiner vessels blocks. 4. The main amplifiers of the at least two amplifier blocks use amplifiers having power levels different from each other but having the same characteristic in the frequency spectrum of the distortion component. A feedforward amplifier as described. 5. An input divider for dividing an input signal into two, at least two main amplifier basic blocks having a vector adjuster, a delay circuit, and a main amplifier, and an output signal of one of the input dividers being supplied to the main amplifier. A first power divider that distributes power according to the number of basic blocks and inputs each of the main amplifier basic blocks, and a first power combiner that combines output signals of the at least two main amplifier basic blocks. A second power splitter for splitting the other output signal of the second input splitter into two, a second vector adjuster for adjusting the amplitude and phase of one output signal of the second power splitter, A distortion detecting amplifier for amplifying the output signal of the second vector adjuster; and a second delaying the other output signal of the second power divider.
A distortion detection power combiner that combines the output signal of the distortion detection amplifier and the output signal of the second delay circuit; and an auxiliary amplifier that amplifies the output signal of the distortion detection power combiner. And a distortion removing power combiner for combining an output signal of the first power combiner and an output signal of the auxiliary amplifier. 6. The feedforward amplifier according to claim 5, wherein the main amplifiers of the at least two main amplifier basic blocks and the distortion detection amplifier use amplifiers having the same characteristics. 7. The main amplifiers of the at least two main amplifier basic blocks use amplifiers having different power levels, but having the same characteristic in the frequency spectrum of the distortion component. 6. The feedforward amplifier according to 5. 8. The power amplifier for distortion detection uses an amplifier having a power level different from that of one of the main amplifiers of the at least two main amplifier basic blocks but having the same characteristic as the frequency spectrum of the distortion component. The feedforward amplifier according to claim 5 or 7, wherein: 9. An at least two distortion removal type main amplifier block comprising a vector adjuster, a delay circuit, a main amplifier and a distortion removal power combiner, an input distributor for dividing an input signal into two, and the input distributor. A first power divider that distributes power according to the number of the distortion-removal-type main amplifier blocks, and inputs the output signal to the distortion-removal-type main amplifier block; A first power combiner that combines an output signal of the distortion removal type main amplifier block, a second power divider that divides the other output signal of the input divider into two, and one of the second power dividers A second vector adjuster for adjusting an amplitude and a phase of an output signal of the second power adjuster; a distortion detection amplifier for amplifying an output signal of the second vector adjuster; and a second output signal of the second power splitter. Delay
A delay circuit; a distortion detection power combiner that combines the output signals of the distortion detection amplifier and the second delay circuit; an auxiliary amplifier that amplifies an output signal of the distortion detection power combiner; A third power divider that distributes the output signal of the amplifier in accordance with the number of distortion-reduction-type main amplifier blocks, and a power combiner for removing distortion of the distortion-reduction-type main amplifier block. A feeder amplifier for combining an output signal of a main amplifier of the distortion removal type main amplifier block and an output signal of the third power divider and outputting the combined signal to the first power combiner. 10. The feedforward amplifier according to claim 9, wherein the main amplifiers of the at least two distortion removal type main amplifier blocks and the amplifier for distortion detection have the same characteristics. 11. The main amplifier of the at least two distortion-removal main amplifier blocks uses an amplifier having a different power level but an equal frequency spectrum of a distortion component. Item 10. The feedforward amplifier according to item 9. 12. The amplifier for distortion detection uses an amplifier having a power level different from that of one of the main amplifiers of the at least two distortion removal type main amplifier blocks but having the same frequency spectrum of the distortion component. The feedforward amplifier according to claim 9 or 11, wherein: 13. The feedforward amplifier according to claim 3, wherein said auxiliary amplifier is constituted by said wide band auxiliary amplifier block. 14. An auxiliary amplifier comprising: at least two auxiliary amplifiers having equivalent characteristics arranged in parallel; and a first amplifier provided at an input side of the at least two auxiliary amplifiers.
And a second circuit provided on the output side of the at least two auxiliary amplifiers.
Wherein the first and second switch circuits are selectively connected to any one of the at least two auxiliary amplifiers. Claims 1 to 1
3. The feedforward amplifier according to any one of 3.