JP2014103574A - High frequency oscillation source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency oscillation source that implements low phase noise over an entire tuning band of an oscillator even if the oscillator covers a wider band.SOLUTION: The high frequency oscillation source includes: a reference oscillator 3 for generating an injection wave; a delaying section 4 for delaying the injection wave of the reference oscillator 3; an injection-locked voltage-controlled oscillator 1 adapted to oscillate in synchronism with the injection wave delayed by the delaying section 4; and a phase shift amount control section 11 for controlling a phase shift amount given to the injection wave by a phase shifter 7 such that a phase difference becomes zero between a leaky wave of an output wave of the injection-locked voltage-controlled oscillator 1 leaking from an injection terminal and the injection wave. The use of the leaky wave of the output wave of the injection-locked voltage-controlled oscillator 1 leaking from the injection terminal for phase difference detection is independent of an error due to a phase rotation in the injection-locked voltage-controlled oscillator 1, and has the effect of implementing low phase noise over an entire tuning band of the injection-locked voltage-controlled oscillator 1 with a variable oscillation frequency.

Description

  The present invention relates to a high-frequency oscillation source that reduces phase noise of an oscillator over a wide band.

For example, the high-frequency oscillation source disclosed in the following Non-Patent Document 1 includes a push-push oscillator, a power distributor, a delay line, and a phase shifter.
In this high-frequency oscillation source, a push-push oscillator oscillates with a fundamental wave, and cancels out by synthesizing the fundamental wave at the output terminal to output a double wave.
Most of the second harmonic wave is output to the load, but a part of the second harmonic wave is distributed by the power distributor, and is fed back to the push-push oscillator as an injection wave through the delay line and the phase shifter.
At this time, since the phase noise of the output wave of the push-push oscillator changes according to the phase of the output wave and the injection wave, the phase shift amount by the delay line and the phase shifter is set optimally (for example, 0 A phase shift amount of ° or 2π) and a high-frequency oscillation source with low phase noise can be obtained.
However, when a variable frequency oscillator such as a voltage controlled oscillator is used as the oscillator, the amount of phase shift of feedback changes depending on the frequency, so the phase noise can be reduced over the entire tuning band of the oscillator. There was a problem that could not be done.

As means for solving this problem, for example, a high-frequency oscillation source disclosed in Patent Document 1 below is known.
In Patent Document 1, an injection-locked oscillator that oscillates in synchronization with an injection wave, a power distributor that distributes an output wave of the injection-locked oscillator, and an output wave that is distributed by the power distributor are delayed. A delay means that feeds back the output wave as an injection wave to the injection locking oscillator, and the phase shift amount control means outputs at least one of the output wave of the injection locking oscillator or the injection wave fed back to the injection locking oscillator via the delay means. Monitoring is performed, and the phase shift amount of the output wave in the delay means is controlled in accordance with the monitoring result.

JP 2010-258516 A

Phase-Noise Reduction of X-Band Push-Push Oscillator With Second-Harmonic Self-Injection Techniques, IEEE Trans. MTT, vol. 55 No.1 pp.66-77, Jan. 2007

Since the conventional high-frequency oscillation source is configured as described above, in the configuration disclosed in Patent Document 1, even when a variable frequency oscillator such as a voltage controlled oscillator is used, an injection wave that is fed back according to the frequency is used. It is possible to control the amount of phase shift.
However, since the output wave for controlling the amount of phase shift is monitored for the output wave generated from the output terminal of the injection locking oscillator, an error occurs due to the phase turning in the injection locking oscillator. There is a problem that it is difficult to reduce the phase noise over a sufficiently wide band.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a high-frequency oscillation source that achieves low phase noise over the entire tuning band of the oscillator even when the oscillator is widened.

  The high-frequency oscillation source of the present invention includes a reference oscillator that generates an injection wave, a delay unit that delays the injection wave of the reference oscillator, and a first injection lock that oscillates in synchronization with the injection wave delayed by the delay unit Both the oscillator and the leakage wave leaking from the injection terminal of the output wave of the first injection-locked oscillator and the injection wave input to the first injection-locked oscillator via the delay means are monitored. Phase shift amount control means for controlling the phase shift amount of the injection wave in the delay means according to the result.

  According to the present invention, the reference oscillator for generating the injection wave, the delay means for delaying the injection wave of the reference oscillator, the first injection-locked oscillator that oscillates in synchronization with the injection wave delayed by the delay means, , Monitoring both the leakage wave leaking from the injection terminal of the output wave of the first injection-locked oscillator and the injection wave inputted to the first injection-locked oscillator via the delay means, and the result of the monitoring Accordingly, the phase shift amount control means for controlling the phase shift amount of the injection wave in the delay means is provided, so that the bandwidth of the oscillator is widened without being affected by the phase rotating in the first injection lock oscillator. However, there is an effect that the phase noise can be reduced over the entire tuning band of the oscillator.

It is a block diagram which shows the high frequency oscillation source by Embodiment 1 of this invention. It is a block diagram which shows the high frequency oscillation source by Embodiment 2 of this invention. It is a block diagram which shows the high frequency oscillation source by Embodiment 3 of this invention. It is a block diagram which shows the high frequency oscillation source by Embodiment 4 of this invention. It is a block diagram which shows the high frequency oscillation source by Embodiment 5 of this invention. It is a block diagram which shows the high frequency oscillation source by Embodiment 6 of this invention. It is a block diagram which shows the high frequency oscillation source by Embodiment 7 of this invention. It is a block diagram which shows the high frequency oscillation source by Embodiment 8 of this invention. It is a block diagram which shows the high frequency oscillation source by Embodiment 9 of this invention. It is a block diagram which shows the high frequency oscillation source by Embodiment 10 of this invention. It is a circuit diagram which shows the specific example of the frequency divider | distributor used in Embodiment 10 of this invention. It is a circuit diagram which shows the specific example of the frequency divider | distributor used in Embodiment 10 of this invention.

Embodiment 1 FIG.
1 is a block diagram showing a high-frequency oscillation source according to Embodiment 1 of the present invention.
In FIG. 1, an injection-locked voltage controlled oscillator (first injection-locked oscillator: IL-VCO) 1 is an injection-locked oscillator in which the oscillation frequency of an output wave changes depending on the voltage, and the injection-locked voltage controlled oscillator 1 is synchronized with the injected wave. Then oscillates.
The injection locking voltage controlled oscillator 1 outputs an output wave to the load 2.

A reference oscillator (VCO) 3 generates an injection wave.
The delay processing unit 4 is inserted in the injection wave input path of the injection locking voltage controlled oscillator 1, delays the injection wave oscillated by the reference oscillator 3, and sends the delayed injection wave to the injection locking voltage controlled oscillator 1. inject.
The phase shifter 7 forms a delay processing unit 4 together with the transmission lines 5 and 6, and is output from the delay processing unit 4 by giving the phase shift amount controlled by the phase shift amount control unit 11 to the injection wave. Change the phase of the injected wave.
The delay processing unit 4 constitutes a delay unit.

The coupler 8 detects each leakage wave leaking from the injection terminal among the injection wave input to the injection locking voltage controlled oscillator 1 via the delay processing unit 4 and the output wave of the injection locking voltage control oscillator 1. A part of the radio wave is output to the detection processing unit 10.
The detection processing unit 10 monitors the output wave of the coupler 8 and detects the phase difference between the leakage wave and the injection wave.
The phase shift amount control unit 11 controls the phase shift amount given to the injection wave by the phase shifter 7 so that the phase difference detected by the detection processing unit 10 becomes zero.
The detection processing unit 10 and the phase shift amount control unit 11 constitute a phase shift amount control means 9.

Next, the operation will be described.
The injection locking voltage controlled oscillator 1 oscillates in synchronization with the injection wave input through the delay processing unit 4.
When receiving the injection wave from the reference oscillator 3, the phase shifter 7 of the delay processing unit 4 delays the injection wave by giving the injection wave the phase shift amount controlled by the phase shift amount control unit 11. The delayed injection wave is input to the injection locking voltage controlled oscillator 1.

  The coupler 8 detects the leakage wave leaking from the injection terminal among the injection wave input to the injection locking voltage controlled oscillator 1 via the delay processing unit 4 and the output wave of the injection locking voltage controlled oscillator 1. Are output to the detection processing unit 10.

  The detection processing unit 10 monitors the output wave of the coupler 8 using, for example, a mixer, a phase comparator, and the like. Among the output waves of the injection locking voltage controlled oscillator 1, the leakage wave leaking from the injection terminal and injection locking are detected. The phase difference of the injection wave injected into the voltage controlled oscillator 1 is detected.

When the detection processing unit 10 detects the phase difference between the leakage wave and the injection wave, the phase shift amount control unit 11 controls the phase shift amount given to the injection wave by the phase shifter 7 so that the phase difference becomes zero. To do.
Thereby, when the phase difference between the leakage wave and the injection wave becomes zero, the phase shift amount control unit 11 performs the in-phase synthesis of the desired wave, while reducing the phase noise without performing the in-phase synthesis.
Although the phase shift amount control unit 11 automatically controls the phase shift amount of the phase shifter 7 so that the phase difference between the leakage wave and the injection wave becomes zero, the user has detected the detection processing unit 10. The amount of phase shift of the phase shifter 7 may be controlled manually with reference to the detection result.

As is apparent from the above, according to the first embodiment, the reference oscillator 3 that generates the injection wave, the delay processing unit 4 that delays the injection wave of the reference oscillator 3, and the delay after the delay processing unit 4 performs the delay Phase-locked voltage-controlled oscillator 1 that oscillates in synchronization with the injection wave of the current, and phase shift so that the phase difference between the leakage wave and the injection wave leaking from the injection terminal of the output wave of injection-locking voltage control oscillator 1 becomes zero And a phase shift amount control unit 11 for controlling the phase shift amount given to the injection wave by the vessel 7.
Therefore, of the output wave of the injection locking voltage controlled oscillator 1 for detecting the phase difference, the leakage wave leaking from the injection terminal is used, so that the influence of the error due to the phase turning in the injection locking voltage controlled oscillator 1 can be reduced. Without being received, there is an effect that the phase noise can be reduced over the entire tuning band of the injection locking voltage controlled oscillator 1 whose oscillation frequency is variable.

In the first embodiment, the detection processing unit 10 detects the phase difference between the leakage wave and the injection wave, and the phase shift amount control unit 11 causes the phase difference between the leakage wave and the injection wave to be zero. Although the control unit 7 controls the phase shift amount given to the injection wave by the detector 7, the detection processing unit 10 measures the level of the phase noise in the leaked wave and the injection wave, and the phase shift amount control unit 11 detects the phase shift amount 10. The phase shift amount given to the input wave by the phase shifter 7 may be controlled so that the level of the phase noise measured by the above is reduced.
Also in this case, there is an effect that the phase noise can be reduced over the entire tuning band of the injection locking voltage controlled oscillator 1 without being affected by the error due to the phase turning in the injection locking voltage controlled oscillator 1. .

Embodiment 2. FIG.
FIG. 2 is a block diagram showing a high-frequency oscillation source according to Embodiment 2 of the present invention. In the figure, the same reference numerals as those in FIG.

The power distributor 21 distributes the output wave of the injection locking voltage controlled oscillator 1 and outputs most of the output wave to the external load 2, and a part of the output wave as an injection wave to the delay processing unit 4. Output.
Of course, the radio wave output to the delay processing unit 4 has the same frequency as the oscillation frequency of the injection locking voltage controlled oscillator 1, and thus plays the same role as the injection wave shown in the first embodiment.

  Therefore, also in the second embodiment, as in the first embodiment, the entire tuning band of the injection locking voltage controlled oscillator 1 can be obtained without being affected by the error caused by the phase rotation in the injection locking voltage controlled oscillator 1. There is an effect that the phase noise can be reduced.

Embodiment 3 FIG.
3 is a block diagram showing a high-frequency oscillation source according to Embodiment 3 of the present invention. In the figure, the same reference numerals as those in FIG.

The phase locked loop 31 is a PLL (Phase Locked Loop), and is controlled by the phase shifter 7 so that the phase of the leakage wave of the injection locking voltage control oscillator 1 and the injection wave injected into the injection locking voltage control oscillator 1 becomes zero. Controls the amount of phase shift given to the injected wave.
The phase synchronization circuit 31 constitutes a phase shift amount control means.

The phase comparator 32 of the phase locked loop circuit 31 compares the phases of the leaked wave and the injected wave via the coupler 8 and detects the phase difference between the leaked wave and the injected wave.
The loop filter 33 of the phase synchronization circuit 31 removes the high frequency component of the voltage corresponding to the phase difference detected by the phase comparator 32 and applies it to the phase shifter 7 to control the phase shift amount of the phase shifter 7.

Next, the operation will be described.
The injection locking voltage controlled oscillator 1 oscillates in synchronization with the injection wave injected through the delay processing unit 4.
The phase shifter 7 of the delay processing unit 4 is set with a phase shift amount controlled by the voltage output from the phase locked loop 31. When receiving the injection wave, the phase shift amount is given to the injection wave, The injected wave is delayed, and the delayed injected wave is input to the injection locked voltage controlled oscillator 1.

  The coupler 8 detects the leakage wave leaking from the injection terminal among the injection wave input to the injection locking voltage controlled oscillator 1 via the delay processing unit 4 and the output wave of the injection locking voltage controlled oscillator 1. Is output to the phase synchronization circuit 12.

The phase comparator 32 of the phase locked loop circuit 31 detects the phase difference between the leakage wave and the injection wave by comparing the phase of the leakage wave and the injection wave via the coupler 8.
In the phase locked loop 31, it is obvious that frequency conversion is performed using a prescaler, a frequency divider, or the like in order to compare the phases of the leaky wave and the injected wave.
When the phase comparator 32 detects the phase difference between the leakage wave and the injection wave, the loop filter 33 of the phase locked loop 31 removes the high frequency component of the voltage corresponding to the phase difference and applies it to the phase shifter 7. The phase shift amount of the phase shifter 7 is controlled so that the phase difference becomes zero.
As a result, when the phase difference between the leakage wave and the injection wave becomes zero, the desired wave is synthesized in phase, while the phase noise is reduced without being synthesized in phase.

  Therefore, also in the third embodiment, as in the first embodiment, the entire tuning band of the injection locking voltage controlled oscillator 1 can be obtained without being affected by the error caused by the phase turning in the injection locking voltage controlled oscillator 1. There is an effect that the phase noise can be reduced.

Embodiment 4 FIG.
4 is a block diagram showing a high-frequency oscillation source according to Embodiment 4 of the present invention. In the figure, the same reference numerals as those in FIG.

The mixer 41 of the phase locked loop 31 detects the phase difference between the leakage wave and the injection wave by comparing the phase of the leakage wave and the injection wave via the coupler 8.
In the case of a mixer, the voltage corresponding to the phase difference becomes zero when the phase difference reaches 90 °. Therefore, the voltage is input to the mixer 41 as a control method for setting the phase difference between the leakage wave and the injection wave to zero. It is necessary to use a phase shifter 42 for at least one of the radio waves to be given a phase difference of 90 ° at the comparison frequency.

Thus, in the fourth embodiment using the mixer 41, similarly to the third embodiment, the injection-locked voltage controlled oscillator 1 is not affected by the error caused by the phase turning in the injection-locked voltage controlled oscillator 1. There is an effect that the phase noise can be reduced over the entire tuning band.
Note that the phase synchronization circuit 31 using the mixer 41 may have a phase difference of 90 ° using a transmission line instead of the phase shifter 42.
The phase shifter 42 or the transmission line may be arranged on either the leakage wave transmission path or the injection wave transmission path.

Embodiment 5 FIG.
FIG. 5 is a block diagram showing a high frequency oscillation source according to Embodiment 5 of the present invention. In the figure, the same reference numerals as those in FIG.

The injection locking voltage controlled oscillator (second injection locking oscillator) 51 of the delay processing unit 4 is inserted in the injection wave input path of the injection locking voltage controlled oscillator 1 and controls the injection locking voltage using the output wave as an injection wave. Inject into the oscillator 1.
The phase difference between the leakage wave and the injection wave of the injection locking voltage control oscillator 1 is detected, and the output voltage from the phase shift amount control unit 11 is connected to the control voltage terminal of the injection locking voltage control oscillator 51.
Since a phase difference proportional to the difference between the self-excited oscillation frequency and the injection wave frequency due to the control voltage is generated in the output wave of the injection locking voltage controlled oscillator 51, the phase shift amount control unit corresponding to the phase difference between the leakage wave and the injection wave 11 is applied as the control voltage of the injection locking voltage controlled oscillator 51, so that the role as the delay processing unit 4 that delays and outputs the phase of the injection wave is the phase shift shown in the first embodiment. Plays in place of vessel 7.

  Therefore, also in the fifth embodiment, the phase noise is reduced over the entire tuning band of the injection locking voltage controlled oscillator 1 without being affected by the error due to the phase turning in the injection locking voltage controlled oscillator 1. There is an effect that can be.

Embodiment 6 FIG.
6 is a block diagram showing a high frequency oscillation source according to Embodiment 6 of the present invention. In the figure, the same reference numerals as those in FIG.

The amplifier 61 is inserted in the input path of the injection wave in the injection locking voltage controlled oscillator 1 and amplifies the power of the injection wave.
In the sixth embodiment, the amplifier 61 amplifies the power of the injection wave output from the delay processing unit 4 to increase the power of the injection wave to be given to the injection locking voltage controlled oscillator 1. As a result, an effect of facilitating the synchronization in the injection locking voltage controlled oscillator 1 can be obtained.

Embodiment 7 FIG.
7 is a block diagram showing a high-frequency oscillation source according to Embodiment 7 of the present invention. In the figure, the same reference numerals as those in FIG.

The circulator 71 is inserted into the injection wave input path in the injection locking voltage controlled oscillator 1, the input terminal of the circulator 71 is connected to the output terminal of the delay processing unit 4, and the passing terminal of the circulator 71 is the injection locking voltage controlled oscillator 1. The isolation terminal of the circulator 71 is connected to the termination resistor 72 and is terminated with no reflection.
For this reason, there is an effect of suppressing spurious by suppressing reflection in the delay processing unit 4.

Embodiment 8 FIG.
8 is a block diagram showing a high-frequency oscillation source according to Embodiment 8 of the present invention. In the figure, the same reference numerals as those in FIG.

In the figure, as in the second embodiment, a part of the output wave of the injection locking voltage controlled oscillator 1 is output to the delay processing unit 4 by the power distributor 2.
The circulator 81 is inserted in the input path of the injection wave in the injection locking voltage controlled oscillator 1, the input terminal of the circulator 81 is connected to the output terminal of the power distributor 2, and the pass terminal of the circulator 81 is the input of the delay processing unit 4. The isolation terminal of the circulator 81 is connected to the termination resistor 82 and is non-reflective terminated.
For this reason, there is an effect of suppressing spurious by suppressing reflection in the delay processing unit 4.
In the eighth embodiment, the circulator 81 and the termination resistor 82 are provided between the power distributor 2 and the delay processing unit 4 for FIG. 2, but the reference oscillator 3 A circulator 81 and a termination resistor 82 may be provided between the delay processing units 4.

Embodiment 9 FIG.
9 is a block diagram showing a high-frequency oscillation source according to Embodiment 9 of the present invention. In the figure, the same reference numerals as those in FIG.

The circulator 91 is inserted in the input path of the injection wave in the injection locking voltage controlled oscillator 1, the input terminal of the circulator 91 is connected to the output terminal side of the delay processing unit 4, and the passing terminal of the circulator 91 is the injection locking voltage control oscillator. The isolation terminal of the circulator 91 is connected to the detection processing unit 10, and the leakage wave of the injection locking voltage controlled oscillator 1 is output to the detection processing unit 10.
The coupler 92 outputs only the radio wave corresponding to the injection wave to the detection processing unit 10.

Compared with the first embodiment, a circuit using a circulator 91 instead of the coupler 8 as a method of outputting a leaky wave to the detection processing unit 10, and the injection wave is implemented with the coupler 8 in the first embodiment. The role of the coupler 92 in the ninth embodiment is the same.
Therefore, since there is no difference in other basic operations, the entire tuning band of the injection-locked voltage controlled oscillator 1 is also affected in the ninth embodiment without being affected by errors caused by the phase turning in the injection-locked voltage controlled oscillator 1. There is an effect that the phase noise can be reduced.
In FIG. 9, the coupler 92 is shown on the input terminal side of the circulator 91, but it is obvious that the same effect can be obtained even if the coupler 93 is on the passing terminal side of the circulator 91.

Embodiment 10 FIG.
FIG. 10 is a block diagram showing a high-frequency oscillation source according to Embodiment 10 of the present invention. In the figure, the same reference numerals as those in FIG.

  The frequency distributor 101 has three terminals, the first terminal of the frequency distributor 101 is connected to the output terminal side of the delay processing unit 4, and the second terminal of the frequency distributor 101 is the injection locking voltage controlled oscillator 1. The third terminal of the frequency divider 101 is connected to the detection processing unit 10.

A radio wave equal to the oscillation frequency input from the first terminal of the frequency distributor 101 is selectively output to the second terminal of the frequency distributor 101, and the oscillation input from the second terminal of the frequency distributor 101. A radio wave corresponding to at least one frequency of a harmonic that is an integer multiple of twice or more the frequency is selectively output to the third terminal of the frequency divider 101, thereby selectively detecting the harmonic of the leakage wave. The data can be output to the processing unit 10.
Note that the detection processing unit 10 detects the phase difference from the injected wave after converting the harmonics of the leaky wave to a frequency equal to the oscillation frequency by using a built-in frequency divider (not shown), for example.

  The circuit shown in the tenth embodiment shows the same operation as the circuit shown in the ninth embodiment as long as the harmonics of the leakage wave are used. Therefore, the injection-locked voltage controlled oscillator is also used in the tenth embodiment. The phase noise can be reduced over the entire tuning band of the injection locked voltage controlled oscillator 1 without being affected by the error caused by the phase rotation within 1.

Note that, as the frequency divider shown in Embodiment 10, specific circuit examples in the case where the harmonic is twice the oscillation frequency are shown in FIGS.
FIG. 11 is a circuit example using a lumped constant element.
In FIG. 11, a parallel resonant circuit 111 that is open at a frequency twice the oscillation frequency is opened between the first terminal and the second terminal, and the oscillation frequency is provided between the second terminal and the third terminal. A parallel resonant circuit 112 that is open is provided.
By this circuit, a radio wave equal to the oscillation frequency input from the first terminal is selectively output to the second terminal, and a radio wave twice the oscillation frequency input from the second terminal is selectively output. Output to the third terminal.

FIG. 12 is a circuit example using a transmission line, an open stub, and a short stub.
In FIG. 12, between the first terminal and the second terminal, the second harmonic is selectively cut off by the λ / 4 transmission line 121 and the λ / 4 long open stub 122 for the second harmonic, and the λ / 4 long is short-circuited. The fundamental wave is matched by the stub 123, and the fundamental wave is selectively passed.
On the other hand, the fundamental wave is selectively cut off between the second terminal and the third terminal by the λ / 4 transmission line 124 and the λ / 4 long open stub 125 for the fundamental wave, and the second harmonic wave is selectively passed. ing.
By this circuit, a radio wave equal to the oscillation frequency input from the first terminal is selectively output to the second terminal, and a radio wave twice the oscillation frequency input from the second terminal is selectively output to the second terminal. 3 terminal.

  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. .

  DESCRIPTION OF SYMBOLS 1 Injection locking voltage control oscillator (1st injection locking oscillator) 2 Load 3 Reference oscillator 4 Delay processing part 5,6 Transmission line 7,42 Phase shifter 8,92 coupler 9 Controlling phase shift amount Means, 10 detection processing unit, 11 phase shift amount control unit, 21 power distributor, 31 phase locked loop, 32 phase comparator, 33 loop filter, 41 mixer, 51 injection locked voltage controlled oscillator (second injection locked oscillator) , 61 amplifier, 71, 81, 91 circulator, 72, 82 termination resistor, 101 frequency divider, 111, 112 parallel resonant circuit, 121, 124 λ / 4 transmission line, 122, 125 λ / 4 long open stub, 123 λ / 4 length short stub.

Claims (13)

A reference oscillator for generating an injection wave;
Delay means for delaying the injected wave of the reference oscillator;
A first injection-locked oscillator that oscillates in synchronization with the injection wave delayed by the delay means;
Monitoring both the leaky wave leaking from the injection terminal of the output wave of the first injection-locked oscillator and the injection wave input to the first injection-locked oscillator via the delay means, and the result of the monitoring And a phase shift amount control means for controlling the phase shift amount of the injection wave in the delay means according to the above. A first injection-locked oscillator that oscillates in synchronization with the injection wave;
A power distributor for distributing the output wave of the first injection-locked oscillator;
Delay means for delaying the output wave distributed by the power distributor as an injection wave, and feeding back the delayed injection wave to the first injection-locked oscillator;
Monitoring both the leakage wave leaking from the injection terminal of the output wave of the first injection-locked oscillator and the injection wave fed back to the first injection-locked oscillator via the delay means, and the result of the monitoring And a phase shift amount control means for controlling the phase shift amount of the injection wave in the delay means according to the above. The phase shift amount control means is
3. The high frequency according to claim 1, wherein the phase difference between the leakage wave and the injection wave is detected and the phase shift amount of the injection wave passing through the delay means is controlled so that the phase difference becomes zero. Oscillation source. The phase shift amount control means is
4. The high frequency oscillation source according to claim 3, wherein the high frequency oscillation source is a phase locked loop. The frequency of the injection wave is equal to the oscillation frequency of the first injection-locked oscillator,
5. The high-frequency oscillation source according to claim 1, wherein the leakage wave is a harmonic whose frequency is an integer multiple of twice or more of the oscillation frequency. The phase shift amount control means is
6. The high frequency oscillation source according to claim 5, wherein after the leakage wave is converted to a frequency equal to the oscillation frequency of the first injection locking oscillator by the frequency divider, both the leakage wave and the injection wave are monitored. The delay means is
The high-frequency oscillation source according to any one of claims 1 to 6, wherein a phase shift amount of the injection wave is controlled using a phase shifter. The delay means is
The high-frequency oscillation source according to any one of claims 1 to 6, wherein a phase shift amount of an injection wave is controlled using a second injection-locked oscillator.   9. The high-frequency oscillation source according to claim 1, wherein an amplifier is provided on an input path of an injection wave in the first injection-locked oscillator. A circulator is provided in the input path of the injection wave in the first injection locking oscillator,
The input terminal of the circulator is connected to the output terminal side of the delay means,
The passage terminal of the circulator is connected to the injection terminal side of the first injection-locked oscillator,
10. The high-frequency oscillation source according to claim 1, wherein the isolation terminal of the circulator is terminated with no reflection. A circulator is provided in the input path of the injection wave in the first injection locking oscillator,
The passing terminal of the circulator is connected to the input terminal side of the delay means;
The isolation terminal of the circulator is terminated without reflection,
11. The high-frequency oscillation source according to claim 1, wherein an injection wave in the first injection-locked oscillator is input from an input terminal of the circulator. A circulator is provided in the input path of the injection wave in the first injection locking oscillator,
The input terminal of the circulator is connected to the output terminal side of the delay means,
The passage terminal of the circulator is connected to the injection terminal side of the first injection-locked oscillator,
The isolation terminal of the circulator is connected to the phase shift amount control means, and the leakage wave leaking from the injection terminal among the output waves of the first injection locked oscillator is output to the phase shift amount control means. The high-frequency oscillation source according to any one of claims 1 to 11. A frequency divider having three terminals in the input path of the injection wave in the first injection-locked oscillator;
The first terminal of the frequency divider is connected to the output terminal side of the delay means;
A second terminal of the frequency divider is connected to an injection terminal side of the first injection locking oscillator;
A third terminal of the frequency divider is connected to the phase shift amount control means;
A radio wave equal to the oscillation frequency of the first injection-locked oscillator input from the first terminal of the frequency distributor is selectively output to the second terminal of the frequency distributor,
A radio wave corresponding to at least one of harmonics that is an integer multiple of twice or more the oscillation frequency input from the second terminal of the frequency distributor is selectively output to the third terminal of the frequency distributor. The harmonics of the leaky wave leaking from the injection terminal among the output waves of the first injection-locked oscillator are input to the phase shift amount control means. A high-frequency oscillation source according to claim 1.

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