JP2017112435A - Amplification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an amplification device capable of amplifying a high frequency signal and achieving stable burst oscillation.SOLUTION: An amplification device includes: a clock generating unit which generates a burst clock; a reference oscillator which outputs a first high-frequency signal having a prescribed reference frequency; a burst oscillator including a first amplifier having an input terminal and an output terminal, a feedback loop unit connected in feedback to the input terminal and the output terminal, and a switch inserted in series into the feedback loop unit and for switching an intermittent state of the feedback loop unit by the burst clock, and intermittently outputting a second high-frequency signal obtained by amplifying the first high-frequency signal input from the reference oscillator to the input terminal from the output terminal according to the burst clock; and a second amplifier which amplifies the second high-frequency signal output from the output terminal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an amplifying apparatus.

  Conventionally, a pulse generator comprising: a burst oscillation circuit that generates a burst oscillation signal; and an oscillation start trigger generation circuit that generates an oscillation start trigger signal for forcibly starting oscillation by the burst oscillation circuit (For example, refer to Patent Document 1).

JP 2013-138337 A

  By the way, when a high frequency signal is amplified by a burst oscillation circuit such as a burst oscillation circuit included in a conventional pulse generator, the following problems may occur.

  Since the burst oscillation circuit has an amplifier realized by a transistor, there is a problem that the frequency of the amplified high-frequency signal is not stable until the operation is stabilized after the transient period passes after the burst oscillation circuit is started up. This is because if the output is increased when starting up the burst oscillation circuit, the operating point of the transistor of the amplifier changes.

  An object of the present invention is to provide an amplifying apparatus that amplifies a high-frequency signal and enables stable burst oscillation.

  An amplification device according to an embodiment of the present invention includes a clock generation unit that generates a burst clock, a reference oscillator that outputs a first high-frequency signal having a predetermined reference frequency, a first amplifier that includes an input terminal and an output terminal, A feedback loop unit that is feedback-connected to the input terminal and the output terminal, and a burst oscillator that is inserted in series in the feedback loop unit and switches a switching state of the feedback loop unit by the burst clock, A burst oscillator that intermittently outputs a second high-frequency signal obtained by amplifying the first high-frequency signal input from the reference oscillator to the input terminal from the output terminal according to the burst clock, and the output from the output terminal A second amplifier for amplifying the second high-frequency signal.

  An amplification device that amplifies a high-frequency signal and enables stable burst oscillation can be provided.

1 is a diagram illustrating an amplification device 100 according to an embodiment. It is a figure which shows the frequency characteristic of the output after the oscillation of the burst oscillator 110 is started until the oscillation is stabilized. It is a figure which shows the structure which applied the amplifier 100 to the engine of the vehicle. 4 is a timing chart showing an ignition control signal, a high-frequency signal of a reference oscillator 120, a burst clock, and a high-frequency signal of a burst oscillator 110. It is a figure which shows the modification of the structure which applied the amplifier 100 to the engine of the vehicle.

  Hereinafter, embodiments to which the amplification device of the present invention is applied will be described.

<Embodiment>
FIG. 1 is a diagram illustrating an amplifying apparatus 100 according to an embodiment.

  The amplification device 100 includes a burst oscillator 110, a reference oscillator 120, a burst clock generation unit 130, a control unit 140, an amplifier 150, and an antenna 160.

  The burst oscillator 110 includes an amplifier 111, a feedback loop 112, and a switch 113.

  The amplifier 111 has an input terminal 111A and an output terminal 111B, amplifies a high frequency signal input to the input terminal 111A, and outputs the amplified signal from the output terminal 111B. The amplifier 111 is a high output amplifier, and for example, a HEMT (High Electron Mobility Transistor) can be used. An example of the HEMT is a GaN-HEMT using gallium nitride. The amplifier 111 is an example of a first amplifier.

  The amplifier 111 outputs a high frequency signal having a frequency f1. It is synonymous that the amplifier 111 outputs a high-frequency signal having the frequency f1 and that the burst oscillator 110 outputs a high-frequency signal having the frequency f1.

  Here, the gain of the burst oscillator 110 is, for example, 100 times. The gain of the burst oscillator 110 is about 10 times that of a general amplifier, and is set to 10 times the gain of an amplifier 150 described later.

  The feedback loop 112 connects the input terminal 111A and the output terminal 111B of the amplifier 111. The high-frequency signal output from the output terminal 111B is positively fed back and input to the input terminal 111A. The feedback loop 112 is realized by a transmission line with a small transmission loss, such as a microstrip line.

  Here, the length (electric length) of the feedback loop 112 is such that the sum of the delay time of the high-frequency signal in the amplifier 111 and the delay time of the high-frequency signal transmitted through the feedback loop 112 is an integral multiple of one period at the frequency f1. It is set to such a length that it becomes the time of.

  The delay time of the high frequency signal in the amplifier 111 is the time required for the high frequency signal input to the input terminal 111A of the amplifier 111 to be output from the output terminal 111B of the amplifier 111. The delay time of the high-frequency signal transmitted through the feedback loop 112 is the time required for the high-frequency signal output from the amplifier 111 and input to the feedback loop 112 to be input to the amplifier 111 again.

  The delay time of the high-frequency signal transmitted through the feedback loop 112 can be set by adjusting the length (electric length) of the feedback loop 112.

  If the sum of the delay time of the high-frequency signal in the amplifier 111 and the delay time of the high-frequency signal transmitted through the feedback loop 112 is set to a time that is an integral multiple of one period at the frequency f1, the reference oscillator 120 The phases of the high-frequency signal input to the amplifier 111 and the high-frequency signal fed back by the feedback loop 112 and input to the amplifier 111 can be matched.

  If the phase of the high-frequency signal input from the reference oscillator 120 to the amplifier 111 matches the phase of the high-frequency signal fed back by the feedback loop 112 and input to the amplifier 111, the amplifier 111 causes resonance to efficiently amplify the high-frequency signal. be able to.

  For this reason, the length (electric length) of the feedback loop 112 is such that the sum of the delay time of the high-frequency signal in the amplifier 111 and the delay time of the high-frequency signal transmitted through the feedback loop 112 is an integral multiple of one period at the frequency f1. It is set to such a length that it becomes the time of.

  When the delay time of the high frequency signal in the amplifier 111 can be ignored, the length of the feedback loop 112 may be set to an integral multiple of the wavelength of the high frequency signal having the frequency f1.

  Thus, if the length (electrical length) of the feedback loop 112 is set so that the sum of the delay time of the amplifier 111 and the delay time of the feedback loop 112 is a time that is an integral multiple of one period at the frequency f1. The amplifier 111 and the feedback loop 112 cause resonance so that the high-frequency signal input from the reference oscillator 120 to the input terminal 111A and the high-frequency signal fed back by the feedback loop 112 and input to the input terminal 111A have the same phase. Thus, the high frequency signal input to the input terminal 111A can be amplified by the amplifier 111.

  In order to adjust the length (electric length) of the feedback loop 112, a capacitor may be added. Further, an inductor may be used as the feedback loop 112.

  A switch 113 is inserted in series in the feedback loop 112, and the intermittent state of the feedback loop 112 is switched by the switch 113. When the switch 113 is on (closed), the feedback loop 112 is connected to the loop by the switch 113, and when the switch 113 is off (open), the feedback loop 112 is cut by the switch 113. It becomes a state.

  The switch 113 is inserted in series with the feedback loop 112 and switches the intermittent state of the feedback loop 112. The switch 113 is switched on / off by a burst clock input from the burst clock generation unit 130. The switch 113 is turned on when an H (High) level pulse of the burst clock is input, and is turned off while the burst clock is at the L (Low) level.

  In other words, the feedback loop 112 constructs a loop when an H level pulse of the burst clock is input to the switch 113, and the loop is disconnected when the burst clock input to the switch 113 is at the L level. Become.

  The reference oscillator 120 outputs a high frequency signal having a predetermined reference frequency. The predetermined reference frequency is 2.45 GHz as an example, and the high-frequency signal output from the reference oscillator 120 in this case is a microwave signal.

  The predetermined reference frequency of the high-frequency signal output from the reference oscillator 120 is equal to the frequency f1 of the high-frequency signal output from the burst oscillator 110. Moreover, the output of the high frequency signal which the reference | standard oscillator 120 outputs is 1 W as an example.

  The reference oscillator 120 is provided to lock the burst oscillator 110 at the frequency f1 by injecting a high-frequency signal having the frequency f1 into the amplifier 111 of the burst oscillator 110. Thus, by injecting the high frequency signal having the frequency f1 from the reference oscillator 120 into the amplifier 111 of the burst oscillator 110, the frequency of the high frequency signal output from the burst oscillator 110 is stabilized at the frequency f1.

  The burst clock generation unit 130 generates a burst clock and outputs it to the switch 113. The burst clock is a clock from which H level pulses are output intermittently. The burst clock generation unit 130 sets the frequency f2 of the burst clock at a desired timing based on the clock control signal input from the control unit 140.

  The clock control signal input from the control unit 140 includes the burst clock frequency f2, the timing at which the burst clock H level pulse is output, and the duty ratio (H level period) of the burst clock H level pulse. It is an example of the control command to set.

  The burst clock generation unit 130 includes, for example, a clock generation source, a clock counter to which a clock is input from the clock generation source, and a combinational circuit that thins out an H level pulse of the clock input from the clock generation source according to a clock control signal And outputs a burst clock according to the clock control signal.

  The burst clock generation unit 130 thins out the H level pulse of the clock input from the clock generation source in accordance with the clock control signal input from the control unit 140, so that the timing and frequency f2 according to the clock control signal are reduced. Output burst clock.

  The burst clock generator 130 adjusts the duty ratio (H level period) of the burst clock by adjusting the burst clock so that the H level burst clock is output over a plurality of consecutive H level pulse periods. . Such adjustment of the duty ratio is performed by a combinational circuit.

  The control unit 140 is realized by an information processing unit such as a microcomputer, for example. For example, the control unit 140 is based on engine speed information indicating the engine speed input from the engine control device 200 of the vehicle, ignition timing information indicating ignition timing, and a predetermined duty ratio set in advance. The clock control signal to be output to the burst clock generator 130 is output. The clock control signal is a control command that sets the frequency f2 of the burst clock, the timing at which the H level pulse included in the burst clock rises, and the duty ratio of the H level pulse of the burst clock.

  The frequency f2 of the burst clock represented by the clock control signal is a frequency corresponding to the rotational speed information representing the engine rotational speed input from the engine control apparatus 200, and the timing at which the burst clock pulse represented by the clock control signal rises is The timing corresponds to the ignition timing information input from the engine control device 200. The duty ratio of the H level pulse of the burst clock is set such that the width (period) of the H level pulse of the burst clock is longer than the period of ignition indicated by the ignition control signal.

  The burst clock generation unit 130 may adjust the duty ratio (H level period) of the burst clock according to the rotation speed information. For example, the duty ratio may be adjusted to decrease as the rotational speed increases, and the duty ratio may be adjusted to increase as the rotational speed decreases.

  The engine control device 200 is a control device that controls the fuel injection amount, fuel injection timing, and ignition timing based on the accelerator opening, the engine load, and the like. The engine control device 200 outputs an ignition control signal representing the ignition timing and the engine speed. The ignition control signal is a command for controlling the timing (and frequency) at which the engine control apparatus 200 applies a voltage to the ignition plug, and is output to control the ignition timing.

  The amplifier 150 has an input terminal 151 and an output terminal 152. The amplifier 150 is provided on the output side of the burst oscillator 110, and the input terminal 151 is connected to the output terminal 111B of the amplifier 111. The output terminal 152 is connected to the antenna 160. The amplifier 150 is an example of a second amplifier.

  The amplifier 150 further amplifies the high frequency signal output from the burst oscillator 110 and outputs the amplified signal. The gain (gain) of the amplifier 150 is, for example, 10 times. An antenna 160 is connected to the output side of the amplifier 150.

  The antenna 160 is connected to the output terminal 152 of the amplifier 150 and radiates a high frequency signal output from the amplifier 150. As an example, the antenna 160 is disposed in a cylinder of the engine. The antenna 160 may be any antenna that can radiate a high-frequency signal having the frequency f1, and for example, a patch antenna can be used.

  FIG. 2 is a diagram showing the frequency characteristics of the output from when the oscillation of the burst oscillator 110 is started until the oscillation is stabilized. In FIG. 2, the vertical axis represents the output (W) of the high-frequency signal output from the burst oscillator 110, and the horizontal axis represents the frequency (GHz).

  When the burst oscillator 110 starts oscillating from a state where the high frequency signal is not oscillated, a distribution of the high frequency signal centered on the frequency f1 is obtained as shown by a broken line. The high-frequency signal indicated by the broken line has the highest output at the frequency f1, and the output attenuates as the frequency becomes lower than the frequency f1, and similarly, the output attenuates as the frequency becomes higher than the frequency f1.

  Further, when the output of the burst oscillator 110 is further increased, a high-frequency signal distribution centered on the frequency f1 can be obtained as shown by a one-dot chain line. The distribution of the high-frequency signal indicated by the alternate long and short dash line is such that the output at the frequency f1 is the highest, and the output is increased overall as compared with the distribution of the high-frequency signal indicated by the broken line.

  Further, when the output of the burst oscillator 110 is further increased, a high-frequency signal distribution centered on the frequency f1 is obtained as shown by a two-dot chain line. The distribution of the high-frequency signal indicated by the two-dot chain line is the distribution in which the output at the frequency f1 is the highest and the output is increased as a whole than the distribution of the high-frequency signal indicated by the one-dot chain line.

  Further, when the output of the burst oscillator 110 is further increased, as shown by the solid line, a high-frequency signal distribution centered on the frequency f1 is obtained. The distribution of the high-frequency signal indicated by the solid line is the distribution in which the output at the frequency f1 is the highest and the output is increased overall as compared with the distribution of the high-frequency signal indicated by the two-dot chain line.

  As described above, the output distribution from the start of oscillation of the burst oscillator 110 to the stabilization of the oscillation is a distribution of high-frequency signals centered on the frequency f1, and is very stable in the frequency direction.

  This is because the burst oscillator 110 is locked at the frequency f1 by injecting a high-frequency signal having the frequency f1 from the reference oscillator 120 into the amplifier 111 of the burst oscillator 110.

  In general, in an amplifier using a transistor, the operating point of the transistor changes with an increase in output during a transition period from when the oscillation is stopped to when the output is increased to reach a stable state. When the output is small, the gain is high and the parasitic capacitance is small, so the frequency is high, and when the output is increased, the load capacitance is large and the frequency is lowered.

  That is, in a general amplifier using a transistor, the frequency fluctuates during a transition period from when the oscillation is stopped to when the output is increased to reach a stable state.

  For example, when a 1 W high-frequency signal output from the reference oscillator 120 is amplified to 1000 W using a plurality of amplifiers, for example, amplifiers having a gain of 10 times are connected in series in three stages.

  In such a case, frequency fluctuations occur in each amplifier, and in some cases, the frequency of the high-frequency signal may deviate from ISM (Industry Science Medical).

  On the other hand, the amplifying apparatus 100 of the embodiment can lock the burst oscillator 110 at the frequency f1 by injecting a high-frequency signal having the frequency f1 from the reference oscillator 120 into the amplifier 111 of the burst oscillator 110.

  For this reason, the distribution of output from the start of oscillation of the burst oscillator 110 to the stabilization of the oscillation is a distribution of high-frequency signals centered on the frequency f1, and a very stable characteristic is obtained in the frequency direction.

  Therefore, the amplifying apparatus 100 of the embodiment is very suitable for an application that intermittently outputs a high-frequency signal.

  FIG. 3 is a diagram illustrating a configuration in which the amplification device 100 is applied to a vehicle engine. Here, the vehicle refers to a vehicle equipped with an internal combustion engine (engine) such as an automobile, a motorbike, a light vehicle, and the like. In addition, the vehicle referred to here includes a train equipped with a diesel engine. Moreover, although the form which applies the amplifier 100 to the engine of a vehicle is demonstrated here, engines other than a vehicle may be sufficient. For example, the present invention can be applied to a ship or an airplane engine. In addition, here, a form applied to a reciprocating engine will be described, but it can also be applied to a rotary engine.

  FIG. 3 shows some of the components of the engine 300. The engine 300 includes an engine block 301, a crankshaft 302, a connecting rod 303, a piston 304, an intake valve 305, an exhaust valve 306, and a spark plug 307.

  A space surrounded by the upper surface of the piston 304, the intake valve 305 and the exhaust valve 306, and the inner wall of the engine block 301 is a combustion chamber 308. The tip (lower end) of the spark plug 307 is located at the upper end of the combustion chamber 308.

  The spark plug 307 is connected to the engine control device 200 by a plug cord 309, and a voltage is applied to the electrode 307A by an ignition control signal representing the rotation speed information and the ignition timing information output from the engine control device 200. .

  As shown in the enlarged view on the right side of FIG. 3, the antenna 160 of the amplifying apparatus 100 is disposed beside the ignition plug 307 inside the combustion chamber 308. It has been found that radiating a high frequency signal from the antenna 160 to the combustion chamber 308 when combustion is occurring in the combustion chamber 308 can improve the combustion efficiency. For this reason, in the embodiment, the amplifying device 100 is applied to the engine of the vehicle, and the antenna 160 is disposed inside the combustion chamber 308 beside the spark plug 307.

  The antenna 160 is connected to the output terminal 152 of the amplifier 150 via the coaxial cable 170. More specifically, the antenna 160 and the output terminal 152 of the amplifier 150 are connected by a core wire 171 of the coaxial cable 170. Although not shown here, the shield wire of the coaxial cable 170 is connected to the vehicle body ground.

  FIG. 4 is a timing chart showing the ignition control signal, the high frequency signal of the reference oscillator 120, the burst clock, and the high frequency signal of the burst oscillator 110. In FIG. 4, the vertical axis represents the signal level (voltage) of the signal and the clock, and the horizontal axis is the time axis.

  Here, the high frequency signal of the reference oscillator 120 continues to vibrate at the frequency f1.

  When the ignition control signal rises to H level at time t1, burst clock generation unit 130 raises the burst clock to H level based on the clock control signal. The ignition control signal falls to L level at time t2. The period from time t1 to time t2 varies depending on the engine speed.

  The burst clock is held at the H level from time t1 to time t3. Time t3 is after time t2, and the H clock period of the burst clock is longer than the H level period of the ignition control signal.

  When the burst clock is held at the H level from time t1 to time t3, the switch 113 (see FIG. 1) is turned on from time t1 to time t3, so that the high frequency signal of the burst oscillator 110 is from time t1. It is output during the period up to time t3. That is, the high-frequency signal of the burst oscillator 110 is radiated from the antenna 160 into the combustion chamber 308 over a period from time t1 to time t3. The period from time t1 to time t3 is determined by the duty ratio set in the clock control signal.

  Thus, the period (t1 to t3) during which the high-frequency signal of the burst oscillator 110 is radiated into the combustion chamber 308 by the clock control signal is started simultaneously with the H level period of the ignition control signal, and the ignition control signal H The reason why the time period is set longer than the level period is as follows.

  Since the period in which the fuel burns in the combustion chamber 308 is longer than the period in which the spark plug 307 is ignited (the H level period of the ignition control signal), from the beginning of the period in which the fuel burns in the combustion chamber 308 This is because the high-frequency signal of the burst oscillator 110 is radiated from the antenna 160 into the combustion chamber 308 until the end.

  The H level period of the burst clock is determined by the duty ratio set in the clock control signal. The duty ratio may be optimized in relation to the combustion period.

  After the time t3, the signal level of the burst clock and the high-frequency signal of the burst oscillator 110 becomes zero. Then, when the ignition control signal rises to H level at time t4, the same control as at times t1 to t3 is performed.

  As described above, according to the embodiment, the burst oscillator 110 can be locked at the frequency f1 by injecting the high-frequency signal having the frequency f1 from the reference oscillator 120 into the amplifier 111 of the burst oscillator 110. It is possible to provide the amplifying apparatus 100 in which the output distribution until the oscillation is stabilized is very stable in the frequency direction.

  That is, it is possible to provide an amplifying apparatus 100 that amplifies a high-frequency signal and enables stable burst oscillation.

  Such an amplifying apparatus 100 is very suitable for an application that intermittently outputs a high-frequency signal.

  Therefore, for example, if the antenna 160 is disposed in the combustion chamber 308 of the engine 300, a high-frequency signal can be intermittently radiated from the antenna 160 into the combustion chamber 308 in accordance with the ignition timing and the rotational speed. The combustion efficiency can be dramatically improved.

  Here, the form in which the amplifying apparatus 100 is applied to the engine 300 has been described. However, the application target of the amplifying apparatus 100 is not limited to the engine 300, and an apparatus that radiates a high-frequency signal intermittently. If present, the amplifying apparatus 100 can be applied.

  In the above description, the mode in which the predetermined reference frequency of the high-frequency signal output from the reference oscillator 120 is equal to the frequency f1 of the high-frequency signal output from the burst oscillator 110 has been described. However, the predetermined reference frequency of the high-frequency signal output from the reference oscillator 120 may be a frequency that falls within a range of about ± 5% of the frequency f1 of the high-frequency signal output from the burst oscillator 110.

  FIG. 5 is a diagram illustrating a modification of the configuration in which the amplification device 100 is applied to a vehicle engine.

  In FIG. 5, the antenna 160 of the amplifying apparatus 100 is attached in the vicinity of the electrode 307 </ b> A of the spark plug 307 as shown in the enlarged view of FIG. 5. The coaxial cable 170 is inserted into the spark plug 307, and the antenna 160 is disposed in the vicinity of the electrode 307A.

  Even in such a configuration, as in the configuration shown in FIG. 3, when combustion occurs in the combustion chamber 308, the combustion efficiency is improved by radiating a high-frequency signal from the antenna 160 to the combustion chamber 308. be able to.

As described above, the amplification device according to the exemplary embodiment of the present invention has been described. However, the present invention is not limited to the specifically disclosed embodiment, and without departing from the scope of the claims. Various modifications and changes are possible.
Regarding the above embodiment, the following additional notes are disclosed.
(Appendix 1)
A clock generator for generating a burst clock;
A reference oscillator that outputs a first high-frequency signal having a predetermined reference frequency;
A first amplifier having an input terminal and an output terminal; a feedback loop connected in feedback to the input terminal and the output terminal; a switch that is inserted in series in the feedback loop and that switches an intermittent state of the feedback loop by the burst clock A burst oscillator that intermittently outputs a second high-frequency signal obtained by amplifying the first high-frequency signal input from the reference oscillator to the input terminal from the output terminal according to the burst clock When,
And a second amplifier that amplifies the second high-frequency signal output from the output terminal.
(Appendix 2)
The loop length of the feedback loop is such that the sum of the delay time of the first high frequency signal in the first amplifier and the delay time of the first high frequency signal transmitted through the feedback loop is one period at the reference frequency. The amplifying apparatus according to appendix 1, wherein the amplifying apparatus is set to a length that is an integral multiple of time.
(Appendix 3)
The amplifying apparatus according to appendix 1 or 2, wherein the frequency of the second high-frequency signal is equal to the predetermined reference frequency of the first high-frequency signal.
(Appendix 4)
A control unit that outputs a control command for setting a frequency of a burst clock generated by the clock generation unit and a timing for outputting a pulse of the burst clock to the clock generation unit;
The amplification device according to any one of appendices 1 to 3, wherein the clock generation unit sets a frequency of the burst clock and a timing for outputting the pulse based on the control command.
(Appendix 5)
The amplifying device is mounted on a vehicle having an engine,
The control unit receives rotational speed information representing the rotational speed of the engine and ignition timing information representing the ignition timing of the engine,
The control unit outputs the control command for setting the frequency of the burst clock according to the rotation speed and the timing for outputting the pulse of the burst clock according to the ignition timing to the clock generation unit,
The amplification device according to appendix 4, wherein the clock generation unit generates the burst clock having the frequency corresponding to the rotation speed and the pulse having a timing corresponding to the ignition timing based on the control command.

DESCRIPTION OF SYMBOLS 100 Amplifier 110 Burst oscillator 111A Input terminal 111B Output terminal 111 Amplifier 112 Feedback loop 113 Switch 120 Reference oscillator 130 Burst clock generation part 140 Control part 150 Amplifier 160 Antenna 200 Engine control apparatus 300 Engine 307 Spark plug 308 Combustion chamber

Claims (5)

A clock generator for generating a burst clock;
A reference oscillator that outputs a first high-frequency signal having a predetermined reference frequency;
A first amplifier having an input terminal and an output terminal; a feedback loop connected in feedback to the input terminal and the output terminal; a switch that is inserted in series in the feedback loop and that switches an intermittent state of the feedback loop by the burst clock A burst oscillator that intermittently outputs a second high-frequency signal obtained by amplifying the first high-frequency signal input from the reference oscillator to the input terminal from the output terminal according to the burst clock When,
And a second amplifier that amplifies the second high-frequency signal output from the output terminal.   The loop length of the feedback loop is such that the sum of the delay time of the first high frequency signal in the first amplifier and the delay time of the first high frequency signal transmitted through the feedback loop is one period at the reference frequency. The amplification device according to claim 1, wherein the amplification device is set to have a length that is an integral multiple of time.   The amplifying apparatus according to claim 1, wherein a frequency of the second high-frequency signal is equal to the predetermined reference frequency of the first high-frequency signal. A control unit that outputs a control command for setting a frequency of a burst clock generated by the clock generation unit and a timing for outputting a pulse of the burst clock to the clock generation unit;
4. The amplification device according to claim 1, wherein the clock generation unit sets a frequency of the burst clock and a timing for outputting the pulse based on the control command. 5. The amplifying device is mounted on a vehicle having an engine,
The control unit receives rotational speed information representing the rotational speed of the engine and ignition timing information representing the ignition timing of the engine,
The control unit outputs the control command for setting the frequency of the burst clock according to the rotation speed and the timing for outputting the pulse of the burst clock according to the ignition timing to the clock generation unit,
The amplification device according to claim 4, wherein the clock generation unit generates the burst clock having the frequency corresponding to the rotation speed and the pulse having a timing corresponding to the ignition timing based on the control command.

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