CN115458386A - Ion trap radio frequency driving device - Google Patents
Ion trap radio frequency driving device Download PDFInfo
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- CN115458386A CN115458386A CN202211038194.5A CN202211038194A CN115458386A CN 115458386 A CN115458386 A CN 115458386A CN 202211038194 A CN202211038194 A CN 202211038194A CN 115458386 A CN115458386 A CN 115458386A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
- H01J49/34—Dynamic spectrometers
- H01J49/42—Stability-of-path spectrometers, e.g. monopole, quadrupole, multipole, farvitrons
- H01J49/4205—Device types
- H01J49/422—Two-dimensional RF ion traps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/022—Circuit arrangements, e.g. for generating deviation currents or voltages ; Components associated with high voltage supply
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/025—Detectors specially adapted to particle spectrometers
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Abstract
The application discloses ion trap radio frequency drive arrangement includes: the sampling module is used for outputting a high-voltage signal of the ion trap radio frequency driving device and sampling the high-voltage signal to obtain a sampling signal; the rectification filtering module is used for rectifying and filtering the sampling signal to obtain a direct-current voltage signal; a voltage source for providing a standard voltage reference signal; the proportional-integral controller is used for comparing the direct-current voltage signal with the standard voltage reference signal to obtain a feedback signal; the radio frequency signal source is used for providing local oscillation signals; the frequency mixer is used for adjusting a radio frequency output signal according to the local oscillation signal and the feedback signal to obtain a radio frequency stable signal; and the power amplifier is used for amplifying the radio frequency stable signal and outputting a high-voltage signal through the sampling circuit, so that a larger radio frequency voltage gain and a higher signal-to-noise ratio are ensured.
Description
Technical Field
The application relates to the technical field of quantum computation, in particular to an ion trap radio frequency driving device.
Background
When the ion trap works, the frequency of radio frequency voltage applied to the electrode is usually 10 to 100MHz, and the voltage amplitude is in the order of 100 to 1000V. A spiral resonant cavity is generally used as a voltage amplifying device for radio frequency signals. Meanwhile, the passive band-pass filter is an excellent passive band-pass filter, and can effectively suppress higher harmonic components of radio frequency signals.
In the process of realizing the prior art, the inventor finds that:
when the high-voltage signal generated on the electrode of the ion trap is driven by the spiral resonant cavity to trap ions, the ion trap is particularly sensitive to the fluctuation of a driving circuit, the radio-frequency potential determines the harmonic oscillation frequency of the trapped ions, and the stable radio-frequency potential is favorable for realizing a better trapping effect of the ion trap. In the existing ion trapping system, the influence of factors such as amplifier gain fluctuation, resonant cavity vibration and system temperature drift on the radio frequency voltage stability of the resonant cavity is an urgent problem to be solved.
Therefore, it is desirable to provide a related technical solution that the sampling circuit and the feedback circuit do not affect the Q value of the resonator as much as possible, and can provide a stable rf voltage for the ion trap.
Disclosure of Invention
The embodiment of the application provides a related technical scheme that a sampling circuit and a feedback circuit do not influence the Q value of a resonator as far as possible and can provide stable radio-frequency voltage for an ion trap, and the related technical scheme is used for solving the technical problem that factors such as amplifier gain fluctuation, resonant cavity vibration and system temperature drift influence the stability of the radio-frequency voltage of a resonant cavity in the conventional ion trapping system.
The application provides an ion trap radio frequency drive arrangement, includes:
the sampling module is used for outputting a high-voltage signal of the ion trap radio frequency driving device and sampling the high-voltage signal to obtain a sampling signal;
the rectification filtering module is electrically connected with the sampling module and is used for rectifying and filtering the sampling signal to obtain a direct-current voltage signal;
a voltage source for providing a standard voltage reference signal;
the proportional-integral controller is electrically connected with the rectifying and filtering module and the voltage source and is used for comparing the direct-current voltage signal with the standard voltage reference signal to obtain a feedback signal;
the radio frequency signal source is used for providing local oscillation signals;
the mixer is electrically connected with the proportional-integral controller and the radio frequency signal source and used for adjusting a radio frequency output signal according to the local oscillator signal and the feedback signal to obtain a radio frequency stable signal;
and the power amplifier is electrically connected with the frequency mixer and the sampling circuit and is used for amplifying the radio frequency stable signal and outputting a high-voltage signal through the sampling circuit.
Further, the sampling module comprises a capacitive frequency divider, a first RC series circuit and a second RC series circuit;
the capacitive frequency divider comprises a frequency division input end, a first frequency division output end and a second frequency division output end;
the frequency division input end is connected with the power amplifier;
the first frequency-division output end is respectively connected with one end of the first RC series circuit and the rectification filter circuit;
the second frequency division output end is connected with one end of the second RC series circuit;
the other end of the first RC series circuit and the other end of the second RC series circuit are respectively connected with the ground;
and the parameters of the components of the first RC series circuit and the second RC series circuit are the same.
Further, the first RC series circuit comprises a first resistor and a first capacitor;
the second RC series circuit comprises a second resistor and a second capacitor;
one end of the first resistor is connected with the first frequency division output end, the other end of the first resistor is connected with one end of the first capacitor, and the other end of the first capacitor is connected with the ground;
one end of the second resistor is connected with the second frequency division output end, the other end of the second resistor is connected with one end of the second capacitor, and the other end of the second capacitor is connected with the ground.
Further, the rectification filter module comprises a low-pass filter, an RC high-frequency filter circuit, a first diode, a second diode, an RC parallel circuit and an access capacitor;
the low-pass filter comprises a low-pass input end and a low-pass output end;
the RC high-frequency filter circuit comprises a grounding end, an output end, a first connecting end and a second connecting end;
the access capacitor comprises a first end and a second end;
the low-pass input end of the low-pass filter is connected with the output end of the RC high-frequency filter circuit, and the low-pass output end of the low-pass filter is connected with the proportional-integral controller;
the first connecting end of the RC high-frequency filter circuit is connected with the cathode of the first diode, and the second connecting end of the RC high-frequency filter circuit is connected with the anode of the second diode;
one end of the RC parallel circuit is respectively connected with the anode of the first diode and the first end of the access capacitor;
the other end of the RC parallel circuit is connected with the cathode of the second diode and is grounded;
and the second end of the access capacitor is connected with the first frequency-division output end.
Further, the RC parallel circuit comprises a third capacitor and a third resistor;
one end of the third capacitor and one end of the third resistor after being connected in parallel are respectively connected with the anode of the first diode and the first end of the access capacitor;
the other end of the third capacitor connected with the third resistor in parallel is connected with the cathode of the second diode and grounded.
Further, the RC high-frequency filter circuit comprises a high-frequency filter capacitor, a fourth resistor and a fifth resistor;
one end of the high-frequency filter capacitor is connected with the low-pass input end of the low-pass filter, one end of the fourth resistor and one end of the fifth resistor respectively;
the other end of the high-frequency filter capacitor is connected with the ground;
the other end of the fourth resistor is connected with the cathode of the first diode;
the other end of the fifth resistor is connected with the anode of the second diode.
Further, the critical value frequency of the low-pass filter is 1MHz.
Further, the voltage source is a 5V standard voltage source.
Further, the system also comprises an oscilloscope which is electrically connected with the proportional-integral controller and used for monitoring the feedback signal.
Further, the power amplifier is a non-linear amplifier.
The embodiment provided by the application has at least the following beneficial effects:
the high-voltage signal output by the power amplifier is sampled by arranging the independent sampling module, and meanwhile, the high-voltage signal is provided for the ion trap, so that the sampling signal can be acquired in a more flexible mode, and more space is provided for subsequent improved sampling operation. The influence of alternating current and clutter can be reduced by performing rectification filtering on the sampling signal through the rectification filtering module, and the obtained direct current voltage signal is more accurate. By providing a separate voltage source, a more accurate reference voltage signal can be provided for the proportional-integral controller. The proportional-integral controller can obtain a more accurate feedback signal with little external interference by processing the obtained direct-current voltage signal and the standard voltage reference signal. The mixer can adjust and process the local oscillation signal provided by the radio frequency signal source according to the obtained feedback signal, so as to improve the stability of the output radio frequency stable signal. After the power amplifier amplifies the radio frequency stable signal, a more stable high-voltage signal can be provided to the outside.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a connection block diagram of an ion trap rf driving apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit connection diagram of a sampling module in an ion trap rf driving apparatus according to an embodiment of the present disclosure;
fig. 3 is a circuit connection block diagram of a rectifying and filtering module in an ion trap radio frequency driving apparatus according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit connection diagram of a rectifying and filtering module in an ion trap rf driving apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an internal circuit of a proportional-integral controller in an ion trap rf driving apparatus according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, an rf driving apparatus for an ion trap provided in the present application includes:
the sampling module is used for outputting a high-voltage signal of the ion trap radio frequency driving device and sampling the high-voltage signal to obtain a sampling signal;
the rectification filtering module is electrically connected with the sampling module and is used for rectifying and filtering the sampling signal to obtain a direct-current voltage signal;
a voltage source for providing a standard voltage reference signal;
the proportional-integral controller is electrically connected with the rectifying and filtering module and the voltage source and is used for comparing the direct-current voltage signal with the standard voltage reference signal to obtain a feedback signal;
the radio frequency signal source is used for providing local oscillation signals;
the mixer is electrically connected with the proportional-integral controller and the radio frequency signal source and used for adjusting a radio frequency output signal according to the local oscillator signal and the feedback signal to obtain a radio frequency stable signal;
and the power amplifier is electrically connected with the frequency mixer and the sampling circuit and is used for amplifying the radio frequency stable signal and outputting a high-voltage signal through the sampling circuit.
It should be noted that the sampling module in the present application is configured to divide an amplified signal output by the power amplifier into two paths of identical signals, where one path of signal is used to obtain a sampled signal through sampling, the other path of signal is used to output a high-voltage signal to the ion trap, and the sampled signal is identical to the output high-voltage signal, so as to avoid adverse effects on the high-voltage signal output to the ion trap when the sampled signal is obtained. The amplified signal output by the power amplifier may be understood as a current radio frequency signal, which has an amplitude. The sampling of the amplified signal output by the power amplifier by the sampling module may be understood as the sampling of the amplitude of the current radio frequency signal. After the sampling module obtains a sampling signal through sampling, the sampling signal is rectified and filtered through the rectification filtering module, and the amplitude of the current radio-frequency signal is converted into direct-current voltage. The dc voltage is input to a proportional integral controller, which here may be understood as a PI controller. The proportional-integral controller compares the direct-current voltage obtained by rectification and filtering after sampling with a standard voltage reference signal provided by a voltage source, and outputs a corresponding feedback signal. The feedback signal and the local oscillation signal input by the radio frequency signal source together regulate the radio frequency output of the frequency mixer in real time to stabilize the radio frequency constraint potential, and ensure that the output end of the resonant cavity obtains a stable high-voltage signal. According to the application, the sampling module, the rectifying and filtering module, the proportional-integral controller and the like are combined to form the PI feedback system, and the PI feedback system improves the stability of the voltage of the output end of the spiral resonant cavity. The ion trap radio frequency driving device has a good impedance matching effect, greatly improves the stability of an ion trap radio frequency driving circuit when high-performance work is carried out, and can obtain a better ion trapping effect. The method has the advantages that the radio frequency voltage is locked through the feedback loop, the ion trap radio frequency driving device can be understood as a resonant cavity PI feedback system, the resonant cavity PI feedback system can be used for various frequencies, high quality factor Q is achieved at room temperature, large radio frequency voltage gain and high signal-to-noise ratio are guaranteed, and a design route is indicated for improving the performance of the ion trap driving circuit. It is noted that the three-dimensional confinement of the trap comes from the static harmonic potential (axial) and the radio frequency pseudo-potential (lateral). The effective trap frequency in the axial direction is fairly stable, while the transverse trap frequency fluctuates due to instability of the rf field. Temperature drift and stray capacitance drift can cause fluctuations in trap drive amplitude, resulting in instability of the limiting potential. Thus, the lateral long-term frequency will be unstable, which will negatively affect the fidelity of the gate operation, especially if a dual-quantum bit gate is implemented using the lateral mode. To mitigate these fluctuations, the present application provides an active stabilization system, i.e., an ion trap rf driver. The system can stabilize the atomic oscillation frequency of 1MHz to be better than 10Hz or 10ppm. This means that the ambient noise on the radio frequency circuit is suppressed by 35dB. The technical scheme claimed by the application can effectively improve the sensitivity of ion trap mass spectrum and the fidelity of quantum operation in the application of ion trap quantum information.
Further, the sampling module comprises a capacitive frequency divider, a first RC series circuit and a second RC series circuit;
the capacitive frequency divider comprises a frequency division input end, a first frequency division output end and a second frequency division output end;
the frequency division input end is connected with the power amplifier;
the first frequency-division output end is respectively connected with one end of the first RC series circuit and the rectification filter circuit;
the second frequency division output end is connected with one end of the second RC series circuit;
the other end of the first RC series circuit and the other end of the second RC series circuit are respectively connected with the ground;
and the parameters of the components of the first RC series circuit and the second RC series circuit are the same.
It should be noted that the capacitive frequency divider is used to divide the signal output by the power amplifier into two paths of identical signals, so as to avoid affecting the signal output by the ion trap in order to obtain the sampling signal. The output signals of the first frequency division output end and the second frequency division output end of the capacitive frequency divider are the same. The first RC series circuit is used for sampling and feeding back a sampling signal to the rectifying and filtering module, and the second RC series circuit is used for outputting a voltage signal to the ion trap. The input signal of the frequency division input end is divided into two paths of completely same signals output by the first frequency division output end and the second frequency division output end through the capacitive frequency divider, the first RC series circuit and the second RC series circuit with the same component parameters are combined for signal sampling, and the condition that the stability of the voltage signal output to the ion trap is influenced by the fact that the sampling circuit and the feedback circuit are added can be effectively prevented by feeding back the sampling signal to the rectifying and filtering module connected with the first RC series circuit. The first RC series circuit and the second RC series circuit may be an RC series circuit formed by simply connecting a resistor and at least one capacitor in series, or an RC series circuit formed by connecting a resistor combination formed by combining a plurality of resistors and at least one capacitor in series. In a specific implementation manner, a capacitive frequency divider in the sampling module divides an output signal of the power amplifier into two paths of completely identical signals, one of the two paths of signals is used as a sampling signal, and the other path of signal is used as an external output signal of the output end of the resonant cavity. The first frequency division output end of the capacitive frequency divider is connected with the first RC series circuit and provides a sampling signal for the rectifying and filtering module. Before the capacitive frequency divider is adopted, the output end of the power amplifier can be understood as the output end of the resonant cavity, and after the capacitive frequency divider is adopted, the second RC series circuit connected with the second frequency dividing output end of the capacitive frequency divider serves as the output end of the resonant cavity to provide a stable high-voltage signal to the outside, so that the stability of the ion trap radio-frequency drive circuit can be greatly improved while high-performance work is carried out, and a better ion trapping effect can be achieved. According to the ion trap radio-frequency driving device, the radio-frequency voltage is locked through the feedback loop, the ion trap radio-frequency driving device can be used for various frequencies, high quality factor Q is achieved at room temperature, large radio-frequency voltage gain and high signal-to-noise ratio are guaranteed, the sensitivity of ion trap mass spectrometry and the fidelity of quantum operation in the application of ion trap quantum information can be effectively improved, and a design route is pointed for improving the performance of an ion trap driving circuit.
Further, referring to fig. 2, the first RC series circuit includes a first resistor Rt1 and a first capacitor Ct1;
the second RC series circuit comprises a second resistor Rt2 and a second capacitor Ct2;
one end of the first resistor Rt1 is connected with the first frequency-division output end, the other end of the first resistor Rt1 is connected with one end of the first capacitor Ct1, and the other end of the first capacitor Ct1 is connected with the ground;
one end of the second resistor Rt2 is connected to the second frequency-dividing output end, the other end of the second resistor Rt2 is connected to one end of the second capacitor Ct2, and the other end of the second capacitor Ct2 is grounded.
It should be noted that the component parameters of the first resistor Rt1 and the first capacitor Ct1 in the first RC series circuit need to be consistent with the component parameters of the second resistor Rt2 and the second capacitor Ct2 in the second RC series circuit. The first resistor Rt1 and the second resistor Rt2 may be adjustable resistors with the same model parameter, or fixed resistors with the same model parameter. When the first resistor Rt1 and the second resistor Rt2 can adopt adjustable resistors with the same model parameters, the finally adjusted resistance values of the two resistors need to be kept consistent. The first capacitor Ct1 and the second capacitor Ct2 may be adjustable capacitors with the same model parameter, or fixed value capacitors with the same model parameter. When the first capacitor Ct1 and the second capacitor Ct2 adopt adjustable capacitors with the same model parameters, the finally adjusted capacitance values of the first capacitor Ct1 and the second capacitor Ct2 need to be kept consistent. In a preferred embodiment, the first resistor Rt1 and the second resistor Rt2 are ordinary fixed value resistors with fixed resistance values, and the first capacitor Ct1 and the second capacitor Ct2 are ordinary fixed value capacitors with fixed capacitance values. In a specific embodiment, the first resistor Rt1 and the second resistor Rt2 may be fixed value resistors with a resistance value of 10 Ω, respectively, and the first capacitor Ct1 and the second capacitor Ct2 may be fixed value capacitors with a capacitance value of 4pF, respectively. It is understood that the series order of the first resistor Rt1 and the first capacitor Ct1 can be interchanged, and the series order of the second resistor Rt2 and the second capacitor Ct2 can be interchanged. When the series order of the first resistor Rt1 and the first capacitor Ct1 is interchanged, the series order of the second resistor Rt2 and the second capacitor Ct2 is also interchanged, so that the output of the first frequency-dividing output end and the output of the second frequency-dividing output end are consistent.
Further, referring to fig. 3, the rectifying and filtering module includes a low-pass filter, an RC high-frequency filter circuit, a first diode D1, a second diode D2, an RC parallel circuit, and an access capacitor Cd1;
the low-pass filter comprises a low-pass input end and a low-pass output end;
the RC high-frequency filter circuit comprises a grounding end, an output end, a first connecting end and a second connecting end;
the access capacitor Cd1 comprises a first end and a second end;
the low-pass input end of the low-pass filter is connected with the output end of the RC high-frequency filter circuit, and the low-pass output end of the low-pass filter is connected with the proportional-integral controller;
a first connecting end of the RC high-frequency filter circuit is connected with the cathode of the first diode D1, and a second connecting end of the RC high-frequency filter circuit is connected with the anode of the second diode D2;
one end of the RC parallel circuit is respectively connected with the positive electrode of the first diode D1 and the first end of the access capacitor Cd1;
the other end of the RC parallel circuit is connected with the cathode of the second diode D2 and grounded;
and the second end of the access capacitor Cd1 is connected with the first frequency-division output end.
Note that the low-pass filter has a function of passing low frequencies and blocking high frequencies. The RC high frequency filter circuit is used to filter high frequency signals. The first diode D1 and the second diode D2 are used for rectification. And acquiring a sampling signal of the first frequency-division output end through an RC parallel circuit and an access capacitor Cd 1. The first diode D1 and the second diode D2 are herein understood as diodes, and preferably rectifier diodes are used. The RC high-frequency filter circuit here may consist of at least one resistor connected between the cathode of the first diode D1 and the low-pass input of the low-pass filter, at least one resistor connected between the anode of the second diode D2 and the low-pass input of the low-pass filter, and at least one capacitor connected between the low-pass input of the low-pass filter and ground. The RC parallel circuit here may be an RC parallel circuit obtained by simply connecting one resistor and one capacitor in parallel, an RC parallel circuit obtained by connecting a resistor combination composed of a plurality of resistors and a capacitor combination composed of a plurality of capacitors in parallel, an RC parallel circuit obtained by connecting a capacitor combination composed of one resistor and a plurality of capacitors in parallel, or an RC parallel circuit obtained by connecting a resistor combination composed of a plurality of resistors and one capacitor in parallel. In a preferred embodiment, the first diode D1 and the second diode D2 have the same component parameters. The access capacitor Cd1 may be an adjustable capacitor with an adjustable capacitance value, or may be a fixed value capacitor with a fixed capacitance value, and the access capacitor Cd1 preferably has a fixed value capacitor with a fixed capacitance value. In a specific embodiment, the access capacitor Cd1 may be a fixed value capacitor with a capacitance value of 0.2 pF. It can be understood that, in order to control the condition of the sampling signal in real time or carry out a simulation test, the probes can be connected at the two ends of the accessed capacitor Cd1 during specific implementation, the voltage conditions at the two ends of the capacitor Cd1 are respectively detected as required, and the voltage condition of the sampling signal is obtained, so that the running condition of the ion trap radio frequency driving device is judged.
Further, referring to fig. 4, the RC parallel circuit includes a third capacitor Ct3 and a third resistor Rt3;
one end of the third capacitor Ct3 connected in parallel with the third resistor Rt3 is connected to the positive electrode of the first diode D1 and the first end of the access capacitor Cd1 respectively;
the other end of the third capacitor Ct3 connected in parallel with the third resistor Rt3 is connected to the cathode of the second diode D2 and grounded.
It is to be understood that the third capacitance Ct3 herein is understood as a common capacitance, and the third resistance Rt3 herein is understood as a common resistance. The RC parallel circuit here is formed by connecting the third capacitor Ct3 and the third resistor Rt3 in parallel, both the third capacitor Ct3 and the third resistor Rt3 can pass through an alternating current, and the magnitude of the alternating current is determined by the resistance value of the third resistor Rt3 and the capacitive reactance of the third capacitor Ct 3. The third capacitor Ct3 may be an adjustable capacitor with an adjustable capacitance value, or may be a fixed value capacitor with a fixed capacitance value, and the third capacitor Ct3 is preferably a fixed value capacitor with a fixed capacitance value. The third resistor Rt3 may be an adjustable resistor with an adjustable resistance value or a fixed value resistor with a fixed resistance value, and the third resistor Rt3 is preferably a fixed value resistor with a fixed resistance value. In a specific embodiment, the third capacitor Ct3 may be a fixed value capacitor with a capacitance value of 20pF, and the third resistor Rt3 may be a fixed value resistor with a resistance value of 3k Ω.
Further, referring to fig. 4, the RC high-frequency filter circuit includes a high-frequency filter capacitor Cd2, a fourth resistor Rt4, and a fifth resistor Rt5;
one end of the high-frequency filter capacitor Cd2 is connected with a low-pass input end of the low-pass filter, one end of the fourth resistor Rt4 and one end of the fifth resistor Rt5 respectively;
the other end of the high-frequency filter capacitor Cd2 is connected with the ground;
the other end of the fourth resistor Rt4 is connected to the negative electrode of the first diode D1;
the other end of the fifth resistor Rt5 is connected to the anode of the second diode D2.
It should be noted that the high-frequency filter capacitor Cd2 may be understood as a common capacitor, and the fourth resistor Rt4 and the fifth resistor Rt5 may be understood as common resistors. The high-frequency filter capacitor Cd2 can adopt an adjustable capacitor with an adjustable capacitance value and also can adopt a fixed value capacitor with a fixed capacitance value, and the high-frequency filter capacitor Cd2 preferably adopts a fixed value capacitor with a fixed capacitance value. The high-frequency filter capacitor Cd2 can be used for filtering high-frequency signals. Here, the fourth resistor Rt4 and the fifth resistor Rt5 may be adjustable resistors having adjustable resistance values and the same model parameters, or may be fixed resistors having fixed resistance values and the same model parameters, and the fourth resistor Rt4 and the fifth resistor Rt5 are preferably fixed resistors having fixed resistance values. When the fourth resistor Rt4 and the fifth resistor Rt5 are adjustable resistors with adjustable resistance values, the finally adjusted resistance values of the fourth resistor Rt4 and the fifth resistor Rt5 need to be consistent. In a specific implementation process, a sampling signal enters a rectification filter module through an access capacitor Cd1, is processed by an RC parallel circuit in the rectification filter module, and further is subjected to corresponding rectification processing by a first diode D1 and a second diode D2, then is subjected to high-frequency filtering by an RC high-frequency filter circuit, and finally is subjected to further low-pass filtering by a low-pass filter according to a set critical value Frequency (FC), so as to finally obtain a direct-current voltage signal. The proportional-integral controller compares the received direct-current voltage signal with a standard voltage reference signal acquired by a voltage source, and finally can obtain and output a feedback signal. In a preferred embodiment, the fourth resistor Rt4 and the fifth resistor Rt5 have the same element parameters, the high-frequency filter capacitor Cd2 may be a fixed value capacitor with a capacitance value of 100pF, and the fourth resistor Rt4 and the fifth resistor Rt5 may be fixed value resistors with a resistance value of 5k Ω, respectively.
Further, the critical value frequency of the low-pass filter is 1MHz.
It will be appreciated that in operation of the low pass filter, signals below a set threshold Frequency (FC) will normally pass, while signals above the set threshold frequency are blocked and attenuated. The low-pass filter performs low-pass filtering by setting a frequency point, and the low-pass filter cannot pass through the signal when the frequency of the signal is higher than the set frequency point. Referring to fig. 3 and 4, the threshold frequency of the low pass filter in the present application is preferably set to FC =1MHz.
Further, the voltage source is a 5V standard voltage source.
It should be noted that the proportional-integral controller in the present application requires a standard voltage reference signal input. Referring to fig. 5, the proportional-integral controller in the present application includes an input terminal vref, an input terminal vsense, and an output terminal vctrl. The proportional-integral controller in the application comprises an operational amplifier, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and the like. The voltage source in this application provides a standard voltage reference signal to the proportional integral controller through a vref interface. When the voltage source adopts a standard voltage source of 5V, the negative pole of the voltage source is connected with the ground, and the positive pole of the voltage source is connected with the vref interface of the proportional-integral controller. The 5V standard voltage source provides a 5V standard voltage reference signal for the proportional-integral controller through a vref interface. And the direct-current voltage signal output by the rectifying and filtering module is input to the proportional-integral controller through a vsense interface. The proportional-integral controller outputs a feedback signal through an output end vctrl by comparing a direct-current voltage signal with a standard voltage reference signal. In a specific embodiment, a positive input terminal of an operational amplifier in the proportional-integral controller serves as an input terminal vref of the proportional-integral controller, a negative input terminal of the operational amplifier is connected with one end of a resistor R1, the other end of the resistor R1 serves as an input terminal vsense of the proportional-integral controller, and an output terminal of the operational amplifier serves as an output terminal vctrl of the proportional-integral controller. And a capacitor C2 is connected in parallel between the negative input end and the output end of the operational amplifier, and an RC series circuit obtained by connecting the capacitor C1 and the resistor R2 in series is also connected in parallel.
Further, the device also comprises an oscilloscope which is electrically connected with the proportional-integral controller and is used for monitoring the feedback signal.
It can be understood that the oscilloscope can be used for displaying various waveform signals according to voltage or current and the like, so that a user can conveniently and intuitively acquire test data. The feedback signal output by the proportional-integral controller in the application can display corresponding waveforms through the connected oscilloscope, so that a user can be helped to master the working condition of the ion trap radio-frequency driving device in time, and the working efficiency is improved.
Further, the power amplifier is a non-linear amplifier.
It should be noted that the non-linear amplifier is understood as a power amplifier using a pulse modulation technique.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus comprising the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An ion trap radio frequency drive apparatus, comprising:
the sampling module is used for outputting a high-voltage signal of the ion trap radio frequency driving device and sampling the high-voltage signal to obtain a sampling signal;
the rectification filtering module is electrically connected with the sampling module and is used for rectifying and filtering the sampling signal to obtain a direct-current voltage signal;
a voltage source for providing a standard voltage reference signal;
the proportional-integral controller is electrically connected with the rectifying and filtering module and the voltage source and is used for comparing the direct-current voltage signal with the standard voltage reference signal to obtain a feedback signal;
the radio frequency signal source is used for providing local oscillation signals;
the frequency mixer is electrically connected with the proportional-integral controller and the radio frequency signal source and used for adjusting a radio frequency output signal according to the local oscillator signal and the feedback signal to obtain a radio frequency stable signal;
and the power amplifier is electrically connected with the frequency mixer and the sampling circuit and is used for amplifying the radio frequency stable signal and outputting a high-voltage signal through the sampling circuit.
2. The ion trap radio frequency driving apparatus of claim 1, wherein the sampling module comprises a capacitive divider, a first RC series circuit, a second RC series circuit;
the capacitive frequency divider comprises a frequency division input end, a first frequency division output end and a second frequency division output end;
the frequency division input end is connected with the power amplifier;
the first frequency-division output end is respectively connected with one end of the first RC series circuit and the rectification filter circuit;
the second frequency division output end is connected with one end of the second RC series circuit;
the other end of the first RC series circuit and the other end of the second RC series circuit are respectively connected with the ground;
and the parameters of the components of the first RC series circuit and the second RC series circuit are the same.
3. The ion trap radio frequency driving apparatus of claim 2, wherein the first RC series circuit comprises a first resistor, a first capacitor;
the second RC series circuit comprises a second resistor and a second capacitor;
one end of the first resistor is connected with the first frequency-division output end, the other end of the first resistor is connected with one end of the first capacitor, and the other end of the first capacitor is connected with the ground;
one end of the second resistor is connected with the second frequency division output end, the other end of the second resistor is connected with one end of the second capacitor, and the other end of the second capacitor is connected with the ground.
4. The ion trap radio frequency driving device according to claim 2, wherein the rectifying and filtering module comprises a low pass filter, an RC high frequency filter circuit, a first diode, a second diode, an RC parallel circuit, and an access capacitor;
the low-pass filter comprises a low-pass input end and a low-pass output end;
the RC high-frequency filter circuit comprises a grounding end, an output end, a first connecting end and a second connecting end;
the access capacitor comprises a first end and a second end;
the low-pass input end of the low-pass filter is connected with the output end of the RC high-frequency filter circuit, and the low-pass output end of the low-pass filter is connected with the proportional-integral controller;
the first connecting end of the RC high-frequency filter circuit is connected with the cathode of the first diode, and the second connecting end of the RC high-frequency filter circuit is connected with the anode of the second diode;
one end of the RC parallel circuit is connected with the anode of the first diode and the first end of the access capacitor respectively;
the other end of the RC parallel circuit is connected with the cathode of the second diode and grounded;
and the second end of the access capacitor is connected with the first frequency division output end.
5. The ion trap radio frequency driving apparatus of claim 4, wherein the RC parallel circuit comprises a third capacitor and a third resistor;
one end of the third capacitor and one end of the third resistor after being connected in parallel are respectively connected with the anode of the first diode and the first end of the access capacitor;
the other end of the third capacitor connected with the third resistor in parallel is connected with the cathode of the second diode and grounded.
6. The ion trap radio frequency driving device according to claim 4, wherein the RC high frequency filter circuit comprises a high frequency filter capacitor, a fourth resistor, a fifth resistor;
one end of the high-frequency filter capacitor is connected with the low-pass input end of the low-pass filter, one end of the fourth resistor and one end of the fifth resistor respectively;
the other end of the high-frequency filter capacitor is connected with the ground;
the other end of the fourth resistor is connected with the cathode of the first diode;
the other end of the fifth resistor is connected with the anode of the second diode.
7. The ion trap radio frequency driving apparatus of claim 4, wherein the low pass filter has a threshold frequency of 1MHz.
8. The ion trap radio frequency driving apparatus of claim 1, wherein the voltage source is a 5V standard voltage source.
9. The ion trap radio frequency drive apparatus of claim 1, further comprising an oscilloscope electrically connected to the proportional-integral controller for monitoring the feedback signal.
10. The ion trap radio frequency drive of claim 1, wherein the power amplifier is a non-linear amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211038194.5A CN115458386A (en) | 2022-08-29 | 2022-08-29 | Ion trap radio frequency driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211038194.5A CN115458386A (en) | 2022-08-29 | 2022-08-29 | Ion trap radio frequency driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115458386A true CN115458386A (en) | 2022-12-09 |
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ID=84301398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211038194.5A Pending CN115458386A (en) | 2022-08-29 | 2022-08-29 | Ion trap radio frequency driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115458386A (en) |
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2022
- 2022-08-29 CN CN202211038194.5A patent/CN115458386A/en active Pending
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