JP2014093594A - Phase controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the pass phase of a device as a difference with a required phase amount and calculate the direction and the amount of correction, thereby speeding up the stabilization of the pass phase.SOLUTION: A phase controller of the present invention comprises: a first coupler for branching a high-frequency signal into two; a first phase shifter; an RF processing unit; a second coupler for branching the output signal of the RF processing unit into two; a control unit for controlling the first phase shifter; an attenuator; a second phase shifter; a second distributor for distributing the output signal of the second phase shifter; a first distributor for distributing one of the output signals of the first coupler; a first synthesizer for synthesizing one of the output signals of the first distributor and one of the output signals of the second distributor; a first detector for detecting the output signal of the first synthesizer; a second synthesizer for synthesizing other of the output signals of the first distributor and other of the output signals of the second distributor, with their phases rotated 90 degrees; and a second detector for detecting the output signal of the second synthesizer.

Description

  The present invention relates to a phase control device, and more particularly to optimization of control.

  Conventionally, the phase control device does not determine the phase of the high-frequency signal output from the RF processing unit by providing a phase shifter only in the previous stage of the RF processing unit. A phase shifter is also provided in the subsequent stage of the RF processing unit, and the phase of the high-frequency signal output from the RF processing unit is phase-shifted by the subsequent phase shifter and fed back to the control unit, so that the actual processing is performed in the RF processing unit. Thus, the phase variation of the output high frequency signal can be reflected in the preceding phase shifter. As a result, a technique is disclosed in which a high-frequency signal output from the RF processing unit can be set to a desired phase (see, for example, Patent Document 1).

JP 2011-109260 A

  An object of the present invention is to detect a passing phase of a device as a difference from a required phase amount, calculate a correction direction and a correction amount, and speed up stabilization of the passing phase.

  The phase control device according to the present invention includes a first combiner that divides a high-frequency signal into two, a first phase adjuster that adjusts a phase of an output signal of the first combiner, and an RF process performed on the output signal of the first phase shifter. An RF processing unit for performing the processing, a second coupler for branching the output signal of the RF processing unit, a control unit for controlling the first phase shifter, and a level of one output signal of the second coupler to a predetermined value A second attenuator for adjusting the phase of the output signal of the attenuator, a second distributor for distributing the output signal of the second phase shifter, and distributing one output signal of the first coupler A first distributor, a first combiner that combines one output signal of the first distributor and one output signal of the second distributor, and a first detector that detects the output signal of the first combiner And the other output signal of the first distributor and the other output signal of the second distributor rotated by 90 degrees in phase. And 2 synthesizer, characterized by comprising a second detector for detecting an output signal of the second combiner.

  According to the present invention, it is possible to suppress the variation of the passing phase of the apparatus and fix it to an arbitrary phase. In addition, since the correction direction of the phase fluctuation can be determined before the control, the correction control time can be shortened. As the circuit configuration, the configuration of the detection route has a high degree of freedom, and the accuracy can be arbitrarily defined by detecting the phase fluctuation and setting the control resolution.

It is a block diagram which shows the structure of the phase control apparatus which concerns on one Example of this invention. It is a figure for demonstrating a part of control content of the phase control apparatus which concerns on one Example of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a phase control apparatus according to an embodiment of the present invention.
The phase control device according to the present invention includes an input terminal 1 to which a high-frequency signal is input, a directional coupler 3 connected to the input terminal 1, a phase shifter 5 provided in a subsequent stage of the directional coupler 3, and a phase shifter. For example, an RF (Radio Frequency) processing unit 15 such as a high-frequency amplifier, a radio device, a repeater, or a filter provided in a subsequent stage, a directional coupler 4 provided in a subsequent stage of the RF processing unit 15, and a directional coupler 4 The output end 2 provided in the latter stage is provided. Here, the distance between the input end 1 and the directional coupler 3 and between the directional coupler 4 and the output end 2 is made as short as possible, so that variations and fluctuations in phase are negligible and the phase amount is fixed. It shall be possible. The directional couplers 3 and 4 and the combiners 8 and 13 are phase-controlled hybrid couplers.

  Further, in the phase control device of the present invention, a divider 11 is provided in the branch from the main line of the directional coupler 3, and a variable attenuator for gain setting in the branch from the main line of the directional coupler 4. 6, a phase shifter 7 provided in the subsequent stage of the variable attenuator 6, and a distributor 12 provided in the subsequent stage of the phase shifter 7. A combiner 8 is provided in the subsequent stage of the distributors 11 and 12. There is a detector 9 provided in the subsequent stage, a synthesizer 13 is provided in the other subsequent stage of the distributors 11 and 12, and a detector 14 is provided in the subsequent stage of the synthesizer 13, and the detector 9 and the detector 14 A control unit 10 is provided that receives the output and supplies a control signal to the phase shifter 5, the variable attenuator 6, and the phase shifter 7.

One of the signals branched from the main line by the directional coupler 4 passes through the gain setting variable attenuator 6 and the phase shifter 7, is distributed by the distributor 12, and is input to the combiner 8 and combiner 13. At this time, the signal input to the synthesizer 13 is −90 with respect to the signal input to the synthesizer 8.
The phase is set to deg. One of the signals branched from the main line by the directional coupler 4 is distributed by the distributor 11 and input to the combiner 8 and the combiner 13. At this time, adjustment is performed so that signals of the same phase are input to the synthesizer 8 and the synthesizer 13. It is assumed that the amplitudes of the four signals input to the synthesizer 8 and the synthesizer 13 are all adjusted to be the same value.

The phase control device having such a configuration controls the phase of the high-frequency signal as follows. That is, consider setting the phase of the high-frequency signal output from the phase control device to A deg with respect to the input phase 0 deg of the high-frequency signal.
When the phase difference between the input terminal 1 and the output terminal 2 is A deg by a measuring instrument in advance, the phase of the signal separated by the directional coupler 3 is a deg and the phase when the signal is input to the combiner 8 A + b
It is obtained as deg (or calculated and output each time using a specific function), and this value is stored in a storage area of the control unit 10 or the like. Similarly, the phase of the signal separated by the directional coupler 4 by the measuring device is x deg and the phase when the signal is input to the combiner 8 is x + y deg. Stored in a storage area or the like.

  At this time, the control unit 10 determines the input phase of the synthesizer 8 as a value obtained in advance by a measuring instrument and stored in the storage area (or as a value that is calculated and output each time using a specific function). (A + b) − (x + y) | = 180 deg, that is, a control signal is set in the phase shifter 7 so that the phases of the two signals are inverted. This means that the phase amount of y deg is controlled.

  The two signals input to the synthesizer 8 with opposite phases cancel each other, and as a result, the power input to the detector 9 is minimized. At this time, if the power difference between the two signals input to the synthesizer 8 is large, it is difficult to see the power change due to the phase difference between the two signals, so the variable attenuator 6 suppresses the power difference between the two signals.

When the phase difference between the input end 1 and the output end 2 is shifted to A + α deg, a phase difference of α deg also occurs in the two signals input to the combiner 8, and the power input to the detector 9 increases.
The control unit 10 knows that a phase difference has occurred due to an increase in the power input to the detector 9, but cannot determine whether the phase is advancing or retarding. Therefore, a controller 13 and a detector 14 are further added, The phase advance / delay is determined from the output signal of the detector 14.

The synthesizer 13 inputs a + b deg from the distributor 11 to one input as in the synthesizer 8, and inputs x + y−90 deg made −90 deg by the distributor 12 to the other input.
The output of the synthesizer 13 has the characteristics shown in FIG.
The control unit 10 receives the output signal of the detector 9 and the output signal of the detector 14 and calculates each time based on data (or a specific function) obtained in advance by a measuring instrument or the like and stored in a storage area. As a value to be outputted, a control signal that minimizes the input of the detector 9 is supplied to the phase shifter 5. That is, the phase shifter 5 returns the phase by −α deg to the passing phase of A + α deg.
The phase of the signal output from the output terminal 2 can be A deg.

  Here, the variable attenuator 6 and the phase shifter 7 are electronic variable controlled by the control unit 10, controlled by another circuit, or manually set in accordance with the same idea. A can be set. In addition, it is also possible to control individual circuits, including the phase shifter 5, with the amount of variation in expected environmental changes (temperature, aging, input level), etc. as known parameters.

In addition, since synthesis (cancellation) in the synthesizer 8 is determined by increase / decrease in the output of the synthesizer 8, the variable attenuator 6 and the phase shifter 7 may be in the system of the directional coupler 3.
Further, in order to match the powers of the two signals, the total loss of the directional coupler 3, the divider 11 and the combiner 8, the directional coupler 4, the variable attenuator 6, the phase shifter 7, the divider 12 and the combiner are combined. Since the total loss of 8 only needs to match, various combinations are possible depending on the amount of coupling of the directional couplers 3 and 4 and the combiner 8, and the variable attenuator 6 can be omitted depending on circumstances.

Next, output characteristics of the combiners 8 and 13 will be described with reference to FIG. FIG. 2 is a diagram for explaining a part of the control contents of the phase control apparatus according to an embodiment of the present invention.
Since the signal input to the combiner 13 has a phase of -90 deg with respect to the signal input to the combiner 8, there is a difference between the two combined powers. Here, a + b = 0 deg and x + y = 180 deg. Also, let B be the amplitude of each signal.

When the input of the combiner 13 is x + y = 0 deg, the combined power of the combiner 8 is 2B, and the combined power of the combiner 13 is 1.4B. x + y is 10 deg, 20 deg, ...
As the power increases, the combined power of the combiner 8 decreases and becomes 0 at the time of x + y = 180 deg. At this time, the combined power of the combiner 13 increases from 1.4B, and x + y = 90 deg.
The maximum is 2B. Thereafter, the combined power of the combiner 13 decreases and becomes 1.4B at the time of x + y = 180 deg. When x + y is further changed, the combined power of the combiner 13 becomes minimum at 0 when x + y = 270 deg, and returns to the first 1.4B when x + y = 0 deg. That is, when the combined power of the combiner 13 is larger than 1.4B, x + y−90 deg.
Is between 270 and 0 to 90 deg, and x + y deg is relatively between 0 and 90 and 180 deg. Therefore, the control unit 10 adjusts the phase shifter 5 in the “direction in which x + y is increased”. Conversely, when the combined power of the combiner 13 is smaller than 1.4B, x + y−90 deg is between 90 and 180 to 270 deg, and relatively x + y deg is between 180 and 270 to 360 (0) deg. It will be in. Therefore, the control unit 10 adjusts the phase shifter 5 in the “direction in which x + y is decreased”.
From the above, the control unit 10 can perform correction control by determining the advance or delay of the phase difference shift α 1. Further, since the phase control direction is determined, it is possible to calculate the necessary phase control width from the combined power of the combiner 8 and change the phase to the target point at once.

  According to the present invention, it is possible to suppress the variation of the passing phase of the apparatus and fix it to an arbitrary phase. In addition, since the correction direction of the phase fluctuation can be determined before the control, the correction control time can be shortened. As the circuit configuration, the configuration of the detection route has a high degree of freedom, and the accuracy can be arbitrarily defined by detecting the phase fluctuation and setting the control resolution.

  Although the present invention has been described in detail above, it is needless to say that the present invention is not limited to the phase control apparatus described herein, and can be widely applied to other phase control apparatuses.

  1: input end, 2: output end, 3, 4: directional coupler, 5, 7: phase shifter, 6: attenuator, 8, 13: combiner, 9, 14: detector, 10: control unit, 11, 12: Distributor, 15: RF processing unit.

Claims (1)

A first coupler for branching a high-frequency signal in two; a first phase shifter for adjusting a phase of an output signal of the first coupler; and an RF processor for performing RF processing on an output signal of the first phase shifter; , A second coupler for branching the output signal of the RF processing unit, a control unit for controlling the first phase shifter, and a level of one output signal of the second coupler to be attenuated to a predetermined value An attenuator, a second phaser for adjusting the phase of the output signal of the attenuator, a second distributor for distributing the output signal of the second phaser, and an output signal of one of the first couplers A first distributor, a first combiner that combines one output signal of the first distributor and one output signal of the second distributor, and a first combiner that detects the output signal of the first combiner. One detector, the other output signal of the first distributor and the other 90 degree phase circuit of the second distributor. A second combiner for combining the output signal obtained by a second detector for detecting an output signal of the second combiner,
A phase control apparatus comprising:

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