JP2015033083A - Multiband amplifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiband amplifier that simultaneously implements an efficiency improvement and a circuit scale reduction of the amplifier.SOLUTION: A band correction circuit 17 outputs to an amplitude and phase control circuit 4 an amplitude control signal generated in accordance with frequency band information and an amplitude error detected by an amplitude and phase error detection circuit 16 on the basis of an amplitude error-amplitude control value characteristic specific to each frequency band, and outputs to the amplitude and phase control circuit 4 a phase control signal generated in accordance with the frequency band information and a phase error detected by the amplitude and phase error detection circuit 16 on the basis of a phase error-phase control value characteristic specific to each frequency band. Even the amplitude and phase control circuit 4 and the amplitude and phase error detection circuit 16, which are provided in singles, can thus perform amplitude and phase distortion compensation specific to each frequency band of a multiband RF amplifier 5 to simultaneously implement an efficiency improvement and a circuit scale reduction of the amplifier.

Description

  The present invention relates to a multiband amplifier applied to communication equipment and the like.

In power amplifiers for portable wireless devices, improving power added efficiency is an important issue in order to save power.
As a technique for improving efficiency, there is polar loop distortion compensation.

This compares the amplitude and phase of the input and output signals of the amplifier, controls the amplitude phase variable circuit such as a variable gain device and a variable phase shifter arranged in front of the amplifier according to the comparison result, and controls the amplitude distortion of the amplifier. And a technique for compensating for phase distortion.
As a result, the linear operation region of the amplifier can be expanded, the backoff amount can be reduced, and the efficiency can be improved (see Patent Document 1 and Non-Patent Document 1 below).

  Also, in power amplifiers for portable wireless devices, a single power amplifier module is required to support a plurality of frequency bands, and a single RF amplifier in the module is operated in a wide band, or a switch inside the module. Therefore, multibanding is progressing by switching and using a plurality of RF amplifiers.

JP 2002-353744 A

“Polar-loop Transmitter”, Electronics Letters, vol.15, No.10, pp.286-288, May.1979

  However, when a polar loop distortion compensation circuit is applied to a multiband amplifier module, there is a problem that the distortion compensation circuit is required by the number of bands and the circuit scale increases.

  An object of the present invention is to obtain a multiband amplifier capable of simultaneously improving the efficiency of the amplifier and reducing the circuit scale.

  The multi-band amplifier according to the present invention includes an input selection unit that selectively inputs a high-frequency signal of a system according to frequency band information among high-frequency signals of each system divided into first to n-th frequency bands, and an input selection unit Amplitude control means for controlling the amplitude of the high-frequency signal selected in accordance with the amplitude control signal, high-frequency amplification means for amplifying the high-frequency signal output from the amplitude control means, and high-frequency signal output from the high-frequency amplification means Among the first to n-th frequency bands, an output selection means for selecting and outputting to a system corresponding to the frequency band information, a high-frequency signal selectively input to the amplitude control means, and a high-frequency signal output from the high-frequency amplification means Frequency band information and amplitude error detection based on amplitude error detection means for detecting amplitude error and amplitude error-amplitude control value characteristics corresponding to each frequency band Generating an amplitude control signal corresponding to the amplitude error detected by the step, in which a control signal correction means for outputting the amplitude control means.

According to the present invention, the control signal correcting means outputs the amplitude control signal corresponding to the frequency band information and the amplitude error detected by the amplitude error detecting means based on the amplitude error-amplitude control value characteristic corresponding to each frequency band. Generate and output to the amplitude control means.
Therefore, even if there is only one amplitude control means and one amplitude error detection means, it is possible to perform amplitude distortion compensation according to each frequency band of the multiband high-frequency amplification means, improving the efficiency of the amplifier and reducing the circuit scale There is an effect that can be measured simultaneously.

1 is a configuration diagram illustrating a multiband amplifier according to a first embodiment of the present invention. It is a characteristic view which shows the amplitude error-amplitude control value characteristic according to each frequency band by a band correction circuit. It is a characteristic view which shows the phase error-phase control value characteristic according to each frequency band by a band correction circuit. It is a block diagram which shows the multiband amplifier which the circuit scale increased without applying a band correction circuit. It is a block diagram which shows the multiband amplifier by Embodiment 2 of this invention. It is a block diagram which shows the multiband amplifier by Embodiment 3 of this invention. It is a block diagram which shows the detail of the amplitude variable circuit by Embodiment 4 of this invention. It is a block diagram which shows the detail of the other amplitude variable circuit by Embodiment 4 of this invention. It is a block diagram which shows the detail of the other amplitude variable circuit by Embodiment 4 of this invention.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a multiband amplifier according to Embodiment 1 of the present invention.
The multiband amplifier according to the first embodiment includes a single multiband RF amplifier, and in a configuration in which a high frequency signal selected from among a plurality of frequency bands is amplified by the RF amplifier, an amplitude phase control circuit, A polar loop distortion compensation circuit provided with one amplitude phase error detection circuit is used to perform amplitude phase distortion compensation corresponding to each frequency band of the multi-band RF amplifier.

In FIG. 1, signal lines 1 ₁ to 1 _n (n is an arbitrary natural number of 2 or more) transmit corresponding high-frequency signals in frequency bands 1 to n, respectively.
The branching devices 2 _{1 to} 2 _n are provided in the middle of the signal lines 1 ₁ to 1 _n and each branch a part of the high-frequency signal.
The switch (input selection means) 3 is connected to the signal lines 1 ₁ to 1 _n and selectively inputs high-frequency signals on the signal lines according to frequency band information input from the outside.

The amplitude phase control circuit (amplitude phase control means) 4 controls the amplitude of the high frequency signal selected by the switch 3 according to the amplitude control signal, and controls the phase of the high frequency signal according to the phase control signal.
The RF amplifier (high frequency amplification means) 5 has a function of amplifying high frequency signals of frequency bands 1 to n by one unit, and amplifies the high frequency signal output from the amplitude phase control circuit 4.

The switch (output selection means) 6 is connected to the signal lines 7 _{1 to} 7 _n and selectively outputs the high-frequency signal output from the RF amplifier 5 to the signal line corresponding to the frequency band information.
The branching devices 8 ₁ to 8 _n are provided in the middle of the signal lines 7 _{1 to} 7 _n and respectively branch a part of the high-frequency signal.

An amplitude delay variable circuit (amplitude delay variable means) 9 is an amplitude variable circuit (amplitude variable means) that variably controls the amplitude of the high frequency signal corresponding to the frequency band information among the high frequency signals branched by the branching devices 2 ₁ to 2 _n. ) 10 and a delay variable circuit (delay variable means) 11 for variably controlling the delay of the high frequency signal according to the frequency band information.
An amplitude delay variable circuit (amplitude delay variable means) 12 is an amplitude variable circuit (amplitude variable means) that variably controls the amplitude of a high-frequency signal corresponding to frequency band information among the high-frequency signals branched by the branching units 8 ₁ to 8 _n. ) 13 and a delay variable circuit (delay variable means) 14 for variably controlling the delay of the high frequency signal according to the frequency band information.

The amplitude / phase control signal generation circuit 15 generates an amplitude control signal and a phase control signal and outputs them to the amplitude / phase control circuit 4.
In the amplitude phase control signal generation circuit 15, an amplitude phase error detection circuit (amplitude phase error detection means) 16 detects the amplitude error and phase error of both high frequency signals via the amplitude delay variable circuits 9 and 12.
Also, the band correction circuit (control signal correction means) 17 has frequency band information and amplitude corresponding to the amplitude error detected by the amplitude phase error detection circuit 16 based on the amplitude error-amplitude control value characteristic corresponding to each frequency band. A control signal is generated, and a phase control signal corresponding to the frequency band information and the phase error detected by the amplitude phase error detection circuit 16 is generated based on the phase error-phase control value characteristic corresponding to each frequency band.

Next, the operation will be described.
In FIG. 1, among the high frequency signals passing through the signal lines 1 ₁ to 1 _n , the high frequency signal of the signal line corresponding to the frequency band information is amplified by the RF amplifier 5 and output to the signal line corresponding to the frequency band information. .
However, amplitude phase distortion is generated by the RF amplifier 5.
Therefore, high frequency signals are taken out from the branching devices 2 ₁ to 2 _n on the input side of the RF amplifier 5 and the branching devices 8 ₁ to 8 _n on the output side, and frequency band information is obtained by the variable amplitude delay circuits 9 and 12 on the input side and output side. After adjusting a predetermined amount of amplitude and delay of the high-frequency signal according to the amplitude, the amplitude phase error detection circuit 16 compares the amplitude and phase so that the RF amplifier 5 does not generate amplitude phase distortion. The comparison result is reflected in the amplitude phase control circuit 4.

However, in general, specifications such as saturation power and maximum power of the RF amplifier 5 differ depending on the frequency band.
Further, since the amplitude phase control circuit 4 itself has frequency characteristics, the optimum output value in the closed loop of the amplitude phase error detection circuit 16 is different if the frequency band is different.
Therefore, a band correction circuit 17 is provided.
FIG. 2 shows an amplitude error-amplitude control value characteristic corresponding to each frequency band by the band correction circuit 17, and FIG. 3 shows a phase error-phase control value characteristic corresponding to each frequency band.
These characteristics are obtained by adding the characteristics of the amplitude phase control circuit 4 to the characteristics such as the saturation power and the maximum power of the RF amplifier 5 depending on the frequency band.
In the amplitude error-amplitude control value characteristic shown in FIG. 2 and the phase error-phase control value characteristic shown in FIG. 3, the characteristics of frequency bands 2 to n are different in offset and inclination from the characteristics of frequency band 1. is there.

Based on the amplitude error-amplitude control value characteristic corresponding to each frequency band shown in FIG. 2, the band correction circuit 17 performs amplitude control according to the corresponding frequency band information and the amplitude error detected by the amplitude phase error detection circuit 16. Generate a signal.
Further, based on the phase error-phase control value characteristic corresponding to each frequency band shown in FIG. 3, the corresponding frequency band information and a phase control signal corresponding to the phase error detected by the amplitude phase error detection circuit 16 are generated. .

The amplitude control signal and the phase control signal generated by the band correction circuit 17 are output to the amplitude phase control circuit 4 to control the amplitude of the high frequency signal in accordance with the amplitude control signal and to change the phase of the high frequency signal to the phase control signal. Control accordingly.
Thereafter, the amplitude error and the phase error are converged by the action of the polar loop distortion compensation circuit, and the RF amplifier 5 is compensated for the amplitude and phase distortion.
In this way, by adjusting the output of the amplitude phase error detection circuit 16 according to the frequency band information by the band correction circuit 17, polar loop distortion having one amplitude phase control circuit 4 and one amplitude phase error detection circuit 16 is provided. Even in the compensation circuit, the amplitude phase distortion compensation corresponding to each frequency band of the multiband RF amplifier 5 can always be optimally performed.

FIG. 4 shows a multiband amplifier when the circuit scale is increased without applying the band correction circuit 17.
As shown in FIG. 4, the number of amplitude phase error detection circuits is required by the number of signal lines.
In addition, since the amplitude phase control circuit is provided in front of the switch, the number of amplitude phase control circuits is required by the number of signal lines.
Further, since the variable amplitude delay circuit is not switched according to the frequency band information, the number of variable amplitude delay circuits is required by the number of signal lines on the input side and output side of the high frequency signal.

As described above, according to the first embodiment, the band correction circuit 17 is detected by the frequency band information and amplitude phase error detection circuit 16 based on the amplitude error-amplitude control value characteristic corresponding to each frequency band. An amplitude control signal corresponding to the amplitude error is generated and output to the amplitude phase control circuit 4 and detected by the frequency band information and the amplitude phase error detection circuit 16 based on the phase error-phase control value characteristic corresponding to each frequency band. A phase control signal corresponding to the phase error thus generated is generated and output to the amplitude phase control circuit 4.
Therefore, even if one amplitude phase control circuit 4 and one amplitude phase error detection circuit 16 are provided, amplitude phase distortion compensation corresponding to each frequency band of the multiband RF amplifier 5 can be performed, and the efficiency of the amplifier Improvement and circuit scale reduction can be achieved simultaneously.

Further, according to the first embodiment, the variable amplitude delay circuit 9 is provided between the branching units 2 ₁ to 2 _n and the amplitude phase control signal generation circuit 15, and the branching units 8 ₁ to 8 _n and the amplitude phase control signal are provided. An amplitude delay variable circuit 12 is provided between the generator circuit 15 and the generator circuit 15.
Therefore, when the amplitude error and the phase error of the amplitude phase error detection circuit 16 are 0 in the frequency band 1 by the amplitude setting and the delay setting by the amplitude delay variable circuits 9 and 12, the amplitude control signal and the phase control of the band correction circuit 17 are set. When the signal is 0, the amplitude distortion and phase distortion of the RF amplifier 5 are set to 0, or the amplitude error and phase error of the amplitude phase error detection circuit 16 are 0 in the center frequency band of frequency bands 1 to n. In this case, the amplitude control signal and the phase control signal of the band correction circuit 17 are 0, and the amplitude distortion and the phase distortion of the RF amplifier 5 can be set to 0 or the like, so that each device of the polar loop distortion compensation circuit can be easily set. It can be carried out.

  In the first embodiment, the description has been given of the case where the polar phase distortion compensation circuit including the amplitude phase control circuit 4, the amplitude delay variable circuits 9 and 12, and the amplitude phase control signal generation circuit 15 performs the amplitude phase distortion compensation. However, only amplitude distortion compensation or only phase distortion compensation may be performed.

In the first embodiment, the branching devices 2 ₁ to 2 _n are provided in the middle of the signal lines 11 ₁ to 1 _n , and the branching devices 8 ₁ to 8 _n are provided in the middle of the signal lines 7 _{1 to} 7 _n .
However, one branching device may be provided in each of the preceding stage of the amplitude / phase control circuit 4 and the succeeding stage of the RF amplifier 5, and the same effect can be obtained.

Further, in the first embodiment, the variable amplitude delay circuit 9 is provided between the branching units 2 ₁ to 2 _n and the amplitude / phase control signal generation circuit 15, and the branching units 8 ₁ to 8 _n and the amplitude / phase control signal generation circuit are provided. 15 is provided with a variable amplitude delay circuit 12.
However, an amplitude delay variable circuit is provided only between the branching units 2 _{1 to} 2 _n and the amplitude / phase control signal generation circuit 15 or only between the branching units 8 ₁ to 8 _n and the amplitude / phase control signal generation circuit 15. The same effect can be obtained by adjusting the amplitude setting and the delay setting.

Further, in the first embodiment, the amplitude phase control circuit 4 is provided in the subsequent stage of the switch 3, but the amplitude phase control circuit may be provided for each of the signal lines 1 ₁ to 1 _{n in the} previous stage of the switch 3. A similar effect can be obtained.

  Further, the band correction circuit 17 and the amplitude delay variable circuits 9 and 12 can obtain the same effect regardless of whether they are variable discretely or continuously.

Embodiment 2. FIG.
FIG. 5 is a block diagram showing a multiband amplifier according to Embodiment 2 of the present invention.
The multiband amplifier according to the second embodiment is multibanded by using a polar loop distortion compensation circuit having one amplitude phase error detection circuit in a multiband configuration by providing a plurality of RF amplifiers each having a different frequency band. Amplitude phase distortion compensation corresponding to each frequency band of the RF amplifier is performed.

In FIG. 5, amplitude phase control circuits (amplitude phase control means) 4 ₁ to 4 _n are provided for the respective signal lines 1 ₁ to 1 _n, and the amplitude of the high frequency signal of each frequency band ₁ to _n is used as the amplitude control signal. Control is performed in accordance with the control, and the phase of the high-frequency signal in each frequency band 1 to n is controlled in accordance with the phase control signal.
RF amplifiers (high frequency amplifying means) 5 _{1 to} 5 _n are provided for the respective signal lines 1 ₁ to 1 _n and receive the high frequency signals of the respective frequency bands ₁ to _n output from the amplitude phase control circuits 4 ₁ to 4 _n. Amplify.
The switch 21 outputs the amplitude control signal and the phase control signal output from the band correction circuit 17 to the amplitude phase control circuit corresponding to the frequency band information input from the outside of the amplitude phase control circuits 4 ₁ to 4 _n. To do.
Since other configurations are the same as those in FIG. 1, redundant description is omitted.

Next, the operation will be described.
In FIG. 5, the high frequency signals of the frequency bands ₁ to _n passing through the signal lines 1 ₁ to 1 _n are amplified and output by the RF amplifiers 5 _{1 to} 5 _n , respectively.
However, amplitude phase distortion is generated by the RF amplifiers 5 _{1 to} 5 _n .
In general, the frequency band, specifications such as saturated power, maximum power of the RF amplifier 5 ₁ to 5 _n is different.
Furthermore, since the amplitude phase control circuits 4 ₁ to 4 _n themselves have frequency characteristics, the optimum output value in the closed loop of the amplitude phase error detection circuit 16 differs depending on the frequency band.

Therefore, high-frequency signals are taken out from the input-side branching devices 2 ₁ to 2 _n and the output-side branching devices 8 ₁ to 8 _{n of} the RF amplifiers 5 _{1 to} 5 _n , and the amplitude delay variable circuits 9 and 12 on the input and output sides Then, after adjusting the predetermined amount of the amplitude and delay of the high frequency signal according to the frequency band information, the amplitude and phase are compared and calculated by the amplitude phase error detection circuit 16.

Based on the amplitude error-amplitude control value characteristic corresponding to each frequency band shown in FIG. 2, the band correction circuit 17 performs amplitude control according to the corresponding frequency band information and the amplitude error detected by the amplitude phase error detection circuit 16. Generate a signal.
Further, based on the phase error-phase control value characteristic corresponding to each frequency band shown in FIG. 3, the corresponding frequency band information and a phase control signal corresponding to the phase error detected by the amplitude phase error detection circuit 16 are generated. .
In the second embodiment, the characteristics shown in FIG. 2 and FIG. 3 are changed to characteristics such as saturation power and maximum power of the RF amplifiers 5 _{1 to} 5 _n according to the frequency band, and the amplitude phase control circuits 4 ₁ to 4 _n . It is assumed that characteristics are added.

The amplitude control signal and the phase control signal generated by the band correction circuit 17 are output by the switch 21 to the amplitude / phase control circuit corresponding to the frequency band information among the amplitude / phase control circuits 4 ₁ to 4 _n .
In the amplitude phase control circuit to which the amplitude control signal and the phase control signal are input, the amplitude of the high frequency signal is controlled according to the amplitude control signal, and the phase of the high frequency signal is controlled according to the phase control signal.
Thereafter, the amplitude error and the phase error are converged by the action of the polar loop distortion compensation circuit, and the RF amplifier is compensated for the amplitude and phase distortion.
As described above, even if the polar loop distortion compensation circuit includes one amplitude phase error detection circuit 16 by adjusting the output of the amplitude phase error detection circuit 16 according to the frequency band information by the band correction circuit 17, Amplitude phase distortion compensation corresponding to each frequency band of the multiband RF amplifiers 5 _{1 to} 5 _n can always be optimally performed.

As described above, according to the second embodiment, the band correction circuit 17 is detected by the frequency band information and amplitude phase error detection circuit 16 based on the amplitude error-amplitude control value characteristic corresponding to each frequency band. An amplitude control signal corresponding to the amplitude error is generated and output to the amplitude phase control circuit of the system corresponding to the frequency band information, and the frequency band information and amplitude based on the phase error-phase control value characteristic corresponding to each frequency band A phase control signal corresponding to the phase error detected by the phase error detection circuit 16 is generated and output to the amplitude phase control circuit of the system corresponding to the frequency band information.
Therefore, even if there is only one amplitude phase error detection circuit 16, it is possible to perform amplitude phase distortion compensation according to each frequency band of the multiband RF amplifiers 5 _{1 to} 5 _n , thereby improving the efficiency of the amplifier and the circuit. The scale can be reduced at the same time.

In the second embodiment, the switch 21 for outputting the amplitude control signal and the phase control signal output from the band correction circuit 17 to any one of the amplitude phase control circuits 4 ₁ to 4 _n is provided.
However, the amplitude control signal and phase control signal output from the band correction circuit 17 may be directly output to all the amplitude phase control circuits 4 ₁ to 4 _n without providing the switch 21.

Embodiment 3 FIG.
FIG. 6 is a block diagram showing a multiband amplifier according to Embodiment 3 of the present invention.
The multiband amplifier according to the third embodiment includes both the multiband RF amplifier shown in the first embodiment and the plurality of RF amplifiers having different frequency bands shown in the second embodiment. In the configuration of a multiband RF amplifier provided, a polar loop distortion compensation circuit having a single amplitude phase error detection circuit performs amplitude phase distortion compensation corresponding to each frequency band of the multiband RF amplifier. is there.

In FIG. 6, signal lines 1 _{n + 1} to 1 _m (m is an arbitrary natural number equal to or greater than n + 2) transmit corresponding high frequency signals in the frequency bands n + ₁ to _m .
The branching devices 2 _{n + 1 to} 2 _m are provided in the middle of the signal lines 1 _{n + 1} to 1 _m , and each branch a part of the high-frequency signal.
The amplitude phase control circuit (amplitude phase control means) 4 _{n + 1} to 4 _m is provided for each signal line 1 _{n + 1} to 1 _m, and the amplitude of the high frequency signal of each frequency band n + ₁ to _m is used as the amplitude control signal. The control is performed in accordance with the phase control signal, and the phase of the high-frequency signal in each frequency band n + 1 to m is controlled according to the phase control signal.
RF amplifiers (high frequency amplification means) 5 _{n + 1 to} 5 _m are provided for the respective signal lines 1 _{n + 1} to 1 _m , and each frequency band n + 1 output from the amplitude phase control circuit 4 _{n + 1} to 4 _m. Amplifies ~ m high frequency signals.
Other configurations are the same as those in FIG. 1 or FIG.

Next, the operation will be described.
In FIG. 6, among the high-frequency signals passing through the signal lines 1 ₁ to 1 _n , the high-frequency signal of the signal line corresponding to the frequency band information is amplified by the RF amplifier 5 and output to the signal line corresponding to the frequency band information. .
Further, the high frequency signals of the frequency bands _{n + 1} to _m passing through the signal lines 1 _{n + 1} to 1 _m are amplified and output by the RF amplifiers 5 _{n + 1 to} 5 _m , respectively.
However, amplitude phase distortion is generated by the RF amplifiers 5 and 5 _{n + 1 to} 5 _m .
In general, specifications such as saturation power and maximum power of the RF amplifiers 5, 5 _{n + 1 to} 5 _m differ depending on the frequency band.
Further, since the amplitude phase control circuits 4 and 4 _{n + 1} to 4 _m themselves have frequency characteristics, the optimum output value of the amplitude phase error detection circuit 16 in the closed loop varies depending on the frequency band.

Therefore, high-frequency signals are taken out from the input branching units 2 ₁ to 2 _m and the output branching units 8 ₁ to 8 _{m of} the RF amplifiers 5 and 5 _{n + 1 to} 5 _m , and the amplitude delays on the input side and the output side can be varied. After the circuits 9 and 12 respectively adjust the predetermined amount of the amplitude and delay of the high-frequency signal according to the frequency band information, the amplitude and phase error detection circuit 16 compares and calculates the amplitude and phase.

Based on the amplitude error-amplitude control value characteristic corresponding to each frequency band shown in FIG. 2, the band correction circuit 17 performs amplitude control according to the corresponding frequency band information and the amplitude error detected by the amplitude phase error detection circuit 16. Generate a signal.
Further, based on the phase error-phase control value characteristic corresponding to each frequency band shown in FIG. 3, the corresponding frequency band information and a phase control signal corresponding to the phase error detected by the amplitude phase error detection circuit 16 are generated. .
In the third embodiment, the characteristics shown in FIGS. 2 and 3 are changed to characteristics such as saturation power and maximum power of the RF amplifiers 5 and 5 _{n + 1 to} 5 _m according to the frequency band. It is assumed that the characteristics of 4 _{n + 1} to 4 _m are added.

The amplitude control signal and the phase control signal generated by the band correction circuit 17 are switched by the switch 21 according to the frequency band information input from the outside of the amplitude phase control circuits 4, 4 _{n + 1} to 4 _m. Output to the control circuit.
In the amplitude phase control circuit to which the amplitude control signal and the phase control signal are input, the amplitude of the high frequency signal is controlled according to the amplitude control signal, and the phase of the high frequency signal is controlled according to the phase control signal.
Thereafter, the amplitude error and the phase error are converged by the action of the polar loop distortion compensation circuit, and the RF amplifier is compensated for the amplitude and phase distortion.
As described above, even if the polar loop distortion compensation circuit includes one amplitude phase error detection circuit 16 by adjusting the output of the amplitude phase error detection circuit 16 according to the frequency band information by the band correction circuit 17, Amplitude phase distortion compensation corresponding to each frequency band of the multiband RF amplifiers 5, 5 _{n + 1 to} 5 _m can always be optimally performed.

As described above, according to the third embodiment, the band correction circuit 17 is detected by the frequency band information and amplitude phase error detection circuit 16 based on the amplitude error-amplitude control value characteristic corresponding to each frequency band. An amplitude control signal corresponding to the amplitude error is generated and output to the amplitude phase control circuit 4 of the system corresponding to the frequency band information, and the frequency band information and the phase control value characteristic corresponding to each frequency band are A phase control signal corresponding to the phase error detected by the amplitude phase error detection circuit 16 is generated and output to the system amplitude phase control circuit 4 corresponding to the frequency band information.
Therefore, even if there is only one amplitude phase error detection circuit 16, it is possible to perform amplitude phase distortion compensation corresponding to each frequency band of the RF amplifiers 5, 5 _{n + 1 to} 5 _m that are multibanded. It is possible to improve efficiency and reduce circuit scale at the same time.

Embodiment 4 FIG.
In the fourth embodiment, details of the amplitude variable circuit shown in the above embodiment will be described.
FIG. 7 is a block diagram showing details of the amplitude variable circuit according to the fourth embodiment of the present invention.
In FIG. 7, the amplitude variable circuits 31 _{1 to} 31 _n have fixed amplitude variable amounts, and respectively adjust the amplitude of the high-frequency signals in each frequency band.
The switch 32 selectively outputs any of the amplitude variable circuits 31 _{1 to} 31 _n according to the frequency band information.
As described above, the output of the amplitude variable circuits 31 _{1 to} 31 _n having a fixed amplitude variable amount may be selected by the switch 32.

FIG. 8 is a block diagram showing details of another amplitude variable circuit according to the fourth embodiment of the present invention.
In FIG. 8, amplitude variable circuits 41 _{1 to} 41 _n each have an amplitude variable amount of a difference value obtained by subtracting a fixed amplitude variable amount from a desired amplitude variable amount, and adjust the amplitude of each high-frequency signal in each frequency band. .
The switch 42 selectively outputs _{one of} the amplitude variable circuits 41 _{1 to} 41 _n according to the frequency band information.
The amplitude variable circuit 43 has a fixed amplitude variable amount and adjusts the amplitude of the high-frequency signal selected by the switch 42.
As described above, the amplitude variable circuits 41 _{1 to} 41 _n having the amplitude variable amount of the difference value may be switched by the switch 42 to share the amplitude variable circuit 43 having the amplitude variable amount of the fixed value.

FIG. 9 is a block diagram showing details of another amplitude variable circuit according to the fourth embodiment of the present invention.
In FIG. 9, the switch 51 selectively outputs one of the high-frequency signals in each frequency band according to the frequency band information.
The amplitude variable circuit 52 provides an amplitude variable amount corresponding to the frequency band information.
As described above, the amplitude variable amount corresponding to the frequency band information may be given to the high frequency signal selected by the switch 51 by the amplitude variable circuit 52.

  As described above, according to the fourth embodiment, the amplitude variable circuit 10 can be configured in various forms.

Although the specific configuration of the amplitude variable circuit 10 has been described in the fourth embodiment, it may be applied to the amplitude variable circuit 13.
Moreover, if the amplitude variable circuits 31 _{1 to} 31 _n , 41 _{1 to} 41 _n , 43 and 52 are replaced with delay variable circuits, the present invention can also be applied to the delay variable circuits 11 and 14.
Furthermore, if the amplitude variable circuits 31 _{1 to} 31 _n , 41 _{1 to} 41 _n , 43 and 52 are replaced with amplitude delay variable circuits, the present invention can also be applied to the amplitude delay variable circuits 9 and 12.

  In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .

1 ₁ to 1 _n , 1 _{n + 1} to 1 _m , 7 _{1 to} 7 _n signal line, 2 ₁ to 2 _n , 2 _{n + 1} to 2 _m , 8 ₁ to 8 _n branching unit, 3, 6, 21, 32, 42, 51 switch, 4, 4 ₁ to 4 _n , 4 _{n + 1} to 4 _m amplitude phase control circuit, 5, 5 _{1 to} 5 _n , 5 _{n + 1 to} 5 _m RF amplifier, 9, 12 amplitude delay Variable circuit 10, 13, 31 _{1 to} 31 _n , 41 _{1 to} 41 _n , 43, 52 Amplitude variable circuit, 11, 14 Delay variable circuit, 15 Amplitude phase control signal generation circuit, 16 Amplitude phase error detection circuit, 17 bands Correction circuit.

Claims (12)

Input selection means for selectively inputting a high-frequency signal of a system corresponding to frequency band information among high-frequency signals of each system divided into first to n-th (n is an arbitrary natural number of 2 or more) frequency bands;
Amplitude control means for controlling the amplitude of the high-frequency signal selected by the input selection means in accordance with an amplitude control signal;
High-frequency amplification means for amplifying a high-frequency signal output from the amplitude control means;
An output selection means for selectively outputting a high-frequency signal output from the high-frequency amplification means to a system corresponding to the frequency band information among the first to n-th frequency bands;
An amplitude error detecting means for detecting an amplitude error between the high frequency signal selectively input to the amplitude control means and the high frequency signal output from the high frequency amplifying means;
Based on the amplitude error-amplitude control value characteristic corresponding to each frequency band, an amplitude control signal corresponding to the frequency band information and the amplitude error detected by the amplitude error detection means is generated and output to the amplitude control means. A multiband amplifier comprising control signal correction means. Input selection means for selectively inputting a high-frequency signal of a system corresponding to frequency band information among high-frequency signals of each system divided into first to n-th (n is an arbitrary natural number of 2 or more) frequency bands;
Phase control means for controlling the phase of the high-frequency signal selected by the input selection means in accordance with a phase control signal;
High-frequency amplification means for amplifying the high-frequency signal output from the phase control means;
An output selection means for selectively outputting a high-frequency signal output from the high-frequency amplification means to a system corresponding to the frequency band information among the first to n-th frequency bands;
Phase error detection means for detecting a phase error between the high frequency signal selectively input to the phase control means and the high frequency signal output from the high frequency amplification means;
Based on the phase error-phase control value characteristic corresponding to each frequency band, a phase control signal corresponding to the frequency band information and the phase error detected by the phase error detection means is generated and output to the phase control means. A multiband amplifier comprising control signal correction means. Input selection means for selectively inputting a high-frequency signal of a system corresponding to frequency band information among high-frequency signals of each system divided into first to n-th (n is an arbitrary natural number of 2 or more) frequency bands;
Amplitude phase control means for controlling the amplitude of the high frequency signal selected by the input selection means according to the amplitude control signal, and controlling the phase of the high frequency signal according to the phase control signal;
High frequency amplification means for amplifying a high frequency signal output from the amplitude phase control means;
An output selection means for selectively outputting a high-frequency signal output from the high-frequency amplification means to a system corresponding to the frequency band information among the first to n-th frequency bands;
Amplitude phase error detection means for detecting an amplitude error and a phase error between the high frequency signal selectively input to the amplitude phase control means and the high frequency signal output from the high frequency amplification means;
Based on the amplitude error-amplitude control value characteristic corresponding to each frequency band, an amplitude control signal corresponding to the frequency band information and the amplitude error detected by the amplitude phase error detection means is generated and output to the amplitude phase control means And generating a phase control signal corresponding to the phase error detected by the frequency band information and the amplitude phase error detecting means on the basis of the phase error-phase control value characteristic corresponding to each frequency band. A multiband amplifier comprising control signal correcting means for outputting to the means. Amplitude control means provided for each system divided into first to nth (n is an arbitrary natural number of 2 or more) frequency bands, and controls the amplitude of the high-frequency signal of each system in accordance with the amplitude control signal. When,
A high-frequency amplification unit that is provided for each system and amplifies a high-frequency signal output from the amplitude control unit;
Amplitude error detection means for detecting an amplitude error between the high frequency signal input to the amplitude control means of the system according to frequency band information and the high frequency signal output from the high frequency amplification means;
Based on the amplitude error-amplitude control value characteristic corresponding to each frequency band, an amplitude control signal corresponding to the frequency band information and the amplitude error detected by the amplitude error detecting means is generated, and the frequency band information corresponding to the frequency band information A multiband amplifier comprising control signal correction means for outputting to the amplitude control means of the system. Phase control means provided for each system divided into first to nth (n is an arbitrary natural number of 2 or more) frequency bands, and controls the phase of the high-frequency signal of each system in accordance with the phase control signal. When,
A high-frequency amplification unit that is provided for each system and amplifies a high-frequency signal output from the phase control unit;
Phase error detection means for detecting a phase error between the high frequency signal input to the phase control means of the system according to frequency band information and the high frequency signal output from the high frequency amplification means;
Based on the phase error-phase control value characteristic corresponding to each frequency band, a phase control signal corresponding to the frequency band information and the phase error detected by the phase error detection means is generated, and the frequency band information is A multiband amplifier comprising control signal correction means for outputting to the phase control means of the system. Provided for each system divided into first to n-th (n is an arbitrary natural number of 2 or more) frequency bands, and controls the amplitude of the high-frequency signal of each system in accordance with the amplitude control signal. Amplitude phase control means for controlling the phase of the high-frequency signal according to the phase control signal,
A high frequency amplifying means provided for each system, each amplifying a high frequency signal output from the amplitude phase control means;
Amplitude phase error detection means for detecting an amplitude error and a phase error between the high frequency signal input to the amplitude phase control means of the system according to frequency band information and the high frequency signal output from the high frequency amplification means;
Based on the amplitude error-amplitude control value characteristic corresponding to each frequency band, an amplitude control signal corresponding to the frequency band information and the amplitude error detected by the amplitude phase error detection means is generated, and the frequency band information is determined. Phase control according to the frequency band information and the phase error detected by the amplitude phase error detection means based on the phase error-phase control value characteristic corresponding to each frequency band, while outputting to the amplitude phase control means of the system A multiband amplifier comprising control signal correction means for generating a signal and outputting the signal to the amplitude phase control means of a system corresponding to the frequency band information.   Between a detection point for detecting a high frequency signal input to the amplitude control means and the amplitude error detection means, and between a detection point for detecting a high frequency signal output from the high frequency amplification means and the amplitude error detection means. 5. The multiband amplifier according to claim 1, further comprising: an amplitude varying unit that is provided in at least one of the first and second components and variably controls the amplitude of the detected high-frequency signal.   Between a detection point for detecting a high frequency signal input to the phase control means and the phase error detection means, and between a detection point for detecting a high frequency signal output from the high frequency amplification means and the phase error detection means. 6. The multiband amplifier according to claim 2, further comprising delay variable means provided in at least one of the first and second delay units for variably controlling the delay of the detected high frequency signal.   Between the detection point for detecting the high frequency signal input to the amplitude phase control means and the amplitude phase error detection means, and the detection point for detecting the high frequency signal output from the high frequency amplification means and the amplitude phase error detection means The multiband according to claim 3 or 6, further comprising amplitude delay varying means provided in at least one of the first and second to variably control the amplitude and delay of the detected high frequency signal. amplifier. Input selection means for selectively inputting a high-frequency signal of a system corresponding to frequency band information among high-frequency signals of each system divided into first to n-th (n is an arbitrary natural number of 2 or more) frequency bands;
First amplitude control means for controlling the amplitude of the high-frequency signal selected by the input selection means in accordance with an amplitude control signal;
A second frequency band is provided for each system divided into n + 1 to mth frequency bands (m is an arbitrary natural number equal to or greater than n + 2) and controls the amplitude of the high frequency signal of each system in accordance with the amplitude control signal. An amplitude control means;
First high frequency amplification means for amplifying the high frequency signal output from the first amplitude control means;
Second high frequency amplification means provided for each of the (n + 1) th to mth systems, each amplifying a high frequency signal output from the second amplitude control means;
An amplitude error between a high-frequency signal input to the first or second amplitude control means and a high-frequency signal output from the first or second high-frequency amplification means in a system corresponding to frequency band information is detected. An amplitude error detection means;
Based on the amplitude error-amplitude control value characteristic corresponding to each frequency band, an amplitude control signal corresponding to the frequency band information and the amplitude error detected by the amplitude error detecting means is generated, and the frequency band information corresponding to the frequency band information A multiband amplifier comprising control signal correction means for outputting to the first or second amplitude control means of the system. Input selection means for selectively inputting a high-frequency signal of a system corresponding to frequency band information among high-frequency signals of each system divided into first to n-th (n is an arbitrary natural number of 2 or more) frequency bands;
First phase control means for controlling the phase of the high-frequency signal selected by the input selection means in accordance with a phase control signal;
A second frequency band is provided for each system divided into n + 1 to mth (m is an arbitrary natural number equal to or greater than n + 2) frequency band, and controls the phase of the high-frequency signal of each system in accordance with the phase control signal. Phase control means;
First high frequency amplification means for amplifying the high frequency signal output from the first phase control means;
A second high frequency amplifying unit provided for each of the (n + 1) th to mth systems and amplifying the high frequency signal output from the second phase control unit;
Detecting a phase error between a high-frequency signal input to the first or second phase control means and a high-frequency signal output from the first or second high-frequency amplification means in a system corresponding to frequency band information Phase error detection means;
Based on the phase error-phase control value characteristic corresponding to each frequency band, a phase control signal corresponding to the frequency band information and the phase error detected by the phase error detection means is generated, and the frequency band information is A multiband amplifier comprising control signal correction means for outputting to the first or second phase control means of the system. Input selection means for selectively inputting a high-frequency signal of a system corresponding to frequency band information among high-frequency signals of each system divided into first to n-th (n is an arbitrary natural number of 2 or more) frequency bands;
First amplitude phase control means for controlling the amplitude of the high-frequency signal selected by the input selection means in accordance with an amplitude control signal, and controlling the phase of the high-frequency signal in accordance with a phase control signal;
Provided for each system divided into n + 1 to mth (m is an arbitrary natural number equal to or greater than n + 2) frequency band, and controls the amplitude of the high-frequency signal of each system according to the amplitude control signal. Second amplitude phase control means for controlling the phase of each of the high frequency signals according to the phase control signal,
First high frequency amplification means for amplifying the high frequency signal output from the first amplitude phase control means;
Second high frequency amplification means provided for each of the (n + 1) -th to m-th systems, each amplifying a high-frequency signal output from the second amplitude phase control means;
Amplitude error and phase between the high frequency signal input to the first or second amplitude phase control means of the system corresponding to the frequency band information and the high frequency signal output from the first or second high frequency amplification means. An amplitude phase error detection means for detecting an error;
Based on the amplitude error-amplitude control value characteristic corresponding to each frequency band, an amplitude control signal corresponding to the frequency band information and the amplitude error detected by the amplitude phase error detection means is generated, and the frequency band information is determined. Output to the first or second amplitude phase control means of the system, and detected by the frequency band information and the amplitude phase error detection means based on the phase error-phase control value characteristic corresponding to each frequency band A multiband amplifier comprising: a control signal correction unit that generates a phase control signal corresponding to the phase error and outputs the phase control signal to the first or second amplitude phase control unit of the system corresponding to the frequency band information.

Images