WO2011148630A1 - Mems共振器 - Google Patents
Mems共振器 Download PDFInfo
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- WO2011148630A1 WO2011148630A1 PCT/JP2011/002910 JP2011002910W WO2011148630A1 WO 2011148630 A1 WO2011148630 A1 WO 2011148630A1 JP 2011002910 W JP2011002910 W JP 2011002910W WO 2011148630 A1 WO2011148630 A1 WO 2011148630A1
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/24—Constructional features of resonators of material which is not piezoelectric, electrostrictive, or magnetostrictive
- H03H9/2405—Constructional features of resonators of material which is not piezoelectric, electrostrictive, or magnetostrictive of microelectro-mechanical resonators
- H03H9/2447—Beam resonators
- H03H9/2463—Clamped-clamped beam resonators
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/48—Coupling means therefor
- H03H9/50—Mechanical coupling means
- H03H9/505—Mechanical coupling means for microelectro-mechanical filters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02244—Details of microelectro-mechanical resonators
- H03H2009/02488—Vibration modes
- H03H2009/02496—Horizontal, i.e. parallel to the substrate plane
Definitions
- the technical field relates to a micro electro mechanical element (MEMS (Micro-Electro Mechanical System) element), and particularly to a MEMS resonator using a micro mechanical element as a vibrator.
- MEMS Micro-Electro Mechanical System
- a filter circuit, a temperature, a vibrator, or the like that uses an improvement in the electric transmission characteristics between input and output electrodes only at a specific frequency, that is, in the vicinity of the resonance frequency (mechanical resonance frequency) of the vibrator.
- a temperature sensor, a pressure sensor, a mass sensor, and the like that utilize the fact that the resonance frequency of the vibrator is shifted by the stress applied to the vibrator, a minute amount of deposits, etc.
- the size of the vibrator is generally as fine as a micrometer or less.
- FIG. 12A is a perspective view of a main part of the MEMS resonator 200 created using an SOI (Silicon On Insulator) substrate.
- SOI Silicon On Insulator
- the uppermost silicon layer of the SOI substrate is etched to form a beam-type vibrator 201, an input electrode 203, and an output electrode 205.
- a part of a BOX (Buried Oxide, buried oxide film) layer 211 is etched to make the vibrator 201 oscillate, and the remaining portions of the BOX layer 211 support both ends 207 of the vibrator 201, the input electrode 203, and the output electrode.
- 205 is anchored to the silicon substrate 209.
- the fourth method for outputting a large output current from the MEMS resonator is to increase the input voltage (vi in FIG. 12B) to the MEMS resonator.
- the amplitude of the vibrator 201 is proportional to the input voltage (vi), and the output current (io) increases as the vibration speed increases.
- Patent Document 1 a certain effect can be expected in that the magnitude of the output current output from the MEMS resonator is increased with respect to the magnitude of the input voltage input to the MEMS resonator.
- the problem of improving the stability of the operation of the MEMS resonator with respect to the magnitude of the input voltage input to the MEMS resonator remains unsolved.
- the resonance characteristics are less likely to exhibit nonlinearity, that is, when the input voltage vi to the MEMS resonator is increased, the MEMS resonator reaches nonlinear resonance.
- a MEMS resonator having a large input voltage margin is provided.
- the vibrators of the N MEMS resonating units may be mechanically coupled by a coupling unit.
- the coupling portion may have a higher electrical impedance than the resistance value of the vibrator.
- the additional capacitance element may be formed on the same substrate as the MEMS resonance unit.
- the impedance element may further include an impedance element that defines a DC potential of a connection portion between the input side capacitance of the at least one MEMS resonance unit and the additional capacitance element, and the impedance of the impedance element is the additional capacitance element. It may be larger than the impedance.
- the impedance element may be formed on the same substrate as the MEMS resonance unit.
- an input-side capacitance is formed by the vibrator and the input electrode facing the vibrator via the gap, and the output facing the vibrator and the vibrator via the gap is formed.
- An output side capacitance is formed by the electrodes, an input electrode of one MEMS resonating unit of the N MEMS resonating units is connected to an input port, and a vibrator of one MEMS resonating unit of the N MEMS resonating units.
- the N MEMS resonance units may be connected in series with the input port, and the output electrodes of the N MEMS resonance units may be connected to the output port.
- a capacitance is formed by the vibrator and an electrode facing the vibrator through a gap, and the vibrator and electrode of one MEMS resonating unit of the N MEMS resonating units. Is connected to the input port, the other one of the MEMS resonators and the electrode is connected to one of the other resonators and electrodes of the other MEMS resonator, and the N MEMS resonators are input ports. May be connected in series.
- the N MEMS resonating units may be connected in parallel to the output port.
- Another aspect is an oscillator including the MEMS resonator according to the above aspect.
- the MEMS resonator has a plurality of MEMS resonators connected in series to the input port on the input side. By doing so, the margin of the input voltage until each resonance part reaches non-linear operation is expanded. In the present MEMS resonator, even if the input voltage vi increases, the resonance characteristics are less likely to exhibit nonlinearity. That is, when the input voltage vi to the MEMS resonator is increased, the input voltage until the MEMS resonator reaches nonlinear resonance. There is a special effect that the margin is large.
- the circuit diagram of the modification of the MEMS resonator of 1st Embodiment The perspective view of the MEMS resonator by 2nd Embodiment Sectional view along line B-B 'in FIG. Top view of the vibrator of FIG.
- a perspective view of a conventional example of a MEMS resonator Cross-sectional view of a conventional MEMS resonator
- capacitive vibration will be described by taking as an example the case where a MEMS resonator is used as an oscillator.
- FIG. 1A and 1B are diagrams showing a configuration of a MEMS resonator that has one MEMS resonance unit 99 and operates as an oscillator.
- a feedback loop is formed by inserting an amplification circuit 51 having a sufficient gain G and an appropriate phase adjustment circuit ⁇ 53 between the input and output terminals of the MEMS resonator to compensate for attenuation of the MEMS resonator.
- an oscillator at the mechanical resonance frequency of the MEMS resonating unit 99 is formed.
- FIG. 1B is a block diagram of an oscillator using a MEMS resonator having one MEMS resonator 99.
- io is an output current of the MEMS resonator
- N MEMS resonating units 99 are connected in parallel on the input side, that is, in parallel to the input port 19, and in parallel on the output side, that is, the output port.
- the output current io of the entire MEMS resonator 81 is N times that of the example of FIGS. 1A and 1B. Accordingly, the power at the input stage of the amplifier 51 is N squared as compared with the examples of FIGS. 1A and 1B, and the C / N ratio is improved by 20 ⁇ logN as compared with the examples of FIGS. 1A and 1B.
- FIGS. 3A and 3B are plots (resonance curves) with respect to the frequency of the input voltage vi of the transfer conductance gm of the MEMS resonating unit 99 shown in FIGS. 1A and 1B.
- FIG. 3A is a resonance curve in the amplitude range of the input voltage vi in which the MEMS resonance unit 99 and the like exhibit stable resonance characteristics.
- the resonance curve transfer conductance gm of the MEMS resonating unit 99 or the like
- the profile is symmetrical about the resonance frequency (peak in the figure), and hysteresis depending on the sweep direction is not seen.
- an input voltage vi having an excessively large amplitude is applied, the resonance curve becomes nonlinear as shown in FIG. 3B, and has hysteresis due to the difference in the sweep direction.
- An arrow 55 here indicates a route followed by a change in gm when the input voltage vi is swept from the low frequency side to the high frequency side, and a dotted line part in the middle is a theoretical route.
- An arrow 57 indicates a route followed by a change in gm when the input voltage vi is swept from the high frequency side to the low frequency side.
- Such a non-linear phenomenon is caused by a constant electrostatic force, that is, when the electrostatic force due to the DC potential difference Vp is always applied to the vibrator, the distance between the vibrator and the electrode becomes too close. This is due to the excessive action and the action of the electrode trying to pull the vibrator.
- This phenomenon is discussed, for example, as non-patent document 1 as capacitive bifcation.
- FIG. 4 shows a configuration of an oscillation circuit using a MEMS resonator 85 having N MEMS resonating units 99 according to the present embodiment.
- the output of the amplifier 51 that is, the input voltage to the MEMS resonator 85 is N ⁇ vi.
- the inputs of the N MEMS resonating units 99 are connected in series to the input port 19. Therefore, the input voltage N ⁇ vi applied to the input port 19 is divided by N in accordance with the number (N) of the MEMS resonating units 99, and the input voltage to the input of each resonator 99 becomes vi. For this reason, the margin with respect to the magnitude
- the output of each MEMS resonating unit 99 is connected to the output port 21 in parallel. Therefore, the output current io from each MEMS resonating unit 99 is multiplied by N and the current N ⁇ io is input to the amplifier 51.
- the output currents io from the N resonance units 99 are bundled and output as N ⁇ io at the output port 21, so that FIGS. 1A and 1B
- the power at the input stage of the amplifier 51 is multiplied by N 2
- the C / N of the oscillator is improved by 20 ⁇ log N.
- FIG. 5 is a circuit diagram of the MEMS resonator 85 according to the present embodiment.
- the number N of MEMS resonating parts is set to three.
- the cross sections of the MEMS resonating units 11a, 11b, and 11c may be substantially the same as FIG. 12B. Since the MEMS resonating units 11a, 11b, and 11c may have substantially the same configuration, the configuration of the resonating unit will be described here taking the MEMS resonating unit 11a as an example.
- the MEMS resonating unit 11a includes an input electrode 3, a vibrator 1, and an output electrode 5.
- the gap between the input electrode 3 and the vibrator 1 and between the vibrator 1 and the output electrode 5 is a gap having a predetermined interval. It is separated.
- the gap between the input electrode 3 and the vibrator 1 forms an input side capacitance 7 (capacitance Ci).
- the gap between the vibrator 1 and the output electrode 5 forms an output side capacitance 9 (capacitance Co).
- the capacitance Ce such as the additional capacitance 13a is larger than the capacitance Ci of the input side capacitance 7. Furthermore, it is desirable that the capacitance Ce such as the additional capacitance 13a is sufficiently larger than the capacitance Ci of the input side capacitance 7.
- the input voltage is divided by the number of MEMS resonators, and the divided input voltage becomes an input voltage for each MEMS resonator.
- the impedance of the additional capacitor 13a or the like (capacitor Ce) is negligibly small as compared with the impedance of the input side capacitance 7 (capacitor Ci).
- the MEMS resonator 100 according to the present embodiment shown in FIG. 4 operates stably as long as the voltage applied to the input port 19 does not exceed 3 vi (N ⁇ vi). That is, the MEMS resonator 100 according to the present embodiment includes N (N: integer greater than or equal to 2) MEMS resonating units 11a and the like, and an input voltage applied to the input port 19 is an allowable voltage applied to the MEMS resonating unit 11a and the like. It is possible to operate stably when it does not exceed N times.
- a bias voltage Vp is applied to an electrical contact located between the vibrator 1 such as each MEMS resonance portion 11a and the additional capacitor 13a (capacitor Ce) via an inductance element 15a (inductance L).
- the inductance elements 15a, b, c (inductance L) constitute an impedance element, and the impedance of the inductance elements 15a, b, c (inductance L) is preferably larger than the impedance of the additional capacitor 13a, etc. (capacitance Ce). .
- the current injected from the input electrode 3 according to the input voltage vi flows to the input electrode 3 of the adjacent resonator via the additional capacitors 13a, b, c (capacitance Ce).
- an additional voltage 13a and the like (capacitance Ce) and high impedance elements 15a, 15b, and 15c (inductance L in the figure) are connected to the individual MEMS resonators 11a, thereby applying an applied voltage to the input port 19.
- the input current associated with 3 ⁇ vi flows as indicated by the broken-line arrows in FIG. That is, the same current value flows through the vibrator 1 such as the individual MEMS resonating unit 11a.
- FIG. 7 is a partial view of the MEMS resonator 81 shown in FIG.
- MEMS resonating units
- the value of the current 97 input to each resonating unit (MEMS) becomes the value up to each resonating unit (MEMS).
- the resonance part (MEMS) located farther from the current input part (input port 19) is attenuated by the input current 97, and accordingly, is caused by the current of each resonance part (MEMS).
- the temperature change is not uniform, and the application effect of the frequency correction technique such as PLL becomes low.
- FIG. 8 is a circuit diagram of a MEMS resonator modification 100v according to the present embodiment.
- the vibrator 1 that faces the input electrode 3 that functions as an electrode that receives an input voltage functions as an output electrode that outputs an output current from each MEMS resonator.
- the gap between the input electrode 3 and the vibrator 1 forms an input side capacitance 7 (capacitance Ci), and the capacitance 7 also functions as an output side capacitance 9 in the resonator 100.
- the input end of the amplifier 63 is connected to each vibrator 1 instead of the inductance elements 15a, b, c (inductance L) in the configuration 100 shown in FIG.
- the output ends of the amplifiers 63 are connected in parallel to the output port 21, and a current obtained by adding the currents from the amplifiers 63 is output from the output port 21.
- the input impedance of the amplifier 63 is desired to be higher than the impedance of the additional capacitor Ce. By doing so, each amplifier 63 can perform a function equivalent to the inductance element L of FIG. 5 (leakage current blocking action).
- the bias DC voltage for the vibrator 1 is also determined according to the bias potential.
- the power supply voltage for driving the amplifier 63 is Vdd
- the input terminal bias DC voltage of the amplifier is generally set to about Vdd / 2. Therefore, in this case, a DC voltage of about Vdd / 2 is applied to the vibrator 1.
- the vibrator 1 functions as an input electrode. It is good also considering the electrode which opposes as an output electrode which outputs an output current.
- the input electrode 3 in FIG. 8 may be a vibrator that can vibrate, and the vibrator 1 in FIG. 8 may be an output electrode that does not vibrate.
- the vibrator functions as an input electrode in at least one MEMS resonator.
- the electrode facing the vibrator is configured to function as an output electrode, and in the other MEMS resonators, the vibrator is functioning as an output electrode, and the electrode facing the vibrator is functioned as an input electrode. May be configured.
- FIG. 9 is a perspective view of the MEMS resonator 100a according to the second embodiment.
- the MEMS resonator 100 a includes three MEMS resonating units, and the resonators 1 of the resonating units are mechanically coupled by a coupling beam 61.
- the coupling beam 61 forms a coupling portion for mechanically coupling the vibrators 1 to each other.
- “tight coupling” and “loose coupling” are known.
- “tight coupling” refers to the case where the vicinity of the “antinode” of the vibration mode of the vibrator 1 is coupled by a thin coupling beam
- “loose coupling” refers to the “node” of the vibration mode of the vibrator 1. This refers to the case where the vicinity is connected with a thin connecting beam, or the vicinity of the “node” is shared.
- the mechanical coupling shown in FIG. 9 is the above-described loose coupling, but it is also possible to employ tight coupling in this embodiment.
- each vibrator 1 when the vibrators 1 are mechanically coupled to each other by the coupling beam 61, each vibrator 1 does not operate independently and can be regarded as one continuous body. Then, the mechanical resonance mode of the vibrator group regarded as the one continuous body can be appropriately selected and used.
- the connection and drive electrodes (input electrodes 3) shown in FIG. 9 the mode in which the three vibrators 1 vibrate in the same phase in the substrate plane direction is strongly excited. Accordingly, an output current io having the same phase is output from each resonator, and is bundled and output from the output port 21 as 3 ⁇ io.
- the plurality of vibrators 1 can be regarded as one vibrator. Therefore, even when the Q value of each resonance part is high, the shift of the mechanical resonance frequency of each resonance part can be ignored.
- resistance elements R1, R2, and R3 are used in place of the inductance element 15a (inductance L) in FIG.
- Ce1, Ce2, and Ce3 in the figure are additional capacitance elements, and have the role of the additional capacitance element 13a (capacitance Ce) in FIG.
- the resistance elements R1 to R3 and the additional capacitance elements Ce1 to Ce3 may be installed outside the substrate on which the vibrator 1 is formed, as shown in FIG. 9, on the same substrate on which the vibrator 1 is formed
- the resonator 100a itself can be reduced in size.
- circuit components are not required to be added in the process of manufacturing the MEMS resonator.
- FIG. 10 is a diagram showing a cross-sectional structure in the vicinity of B-B ′ of FIG.
- the MEMS resonator 100a is formed using an SOI substrate in which silicon is formed on the silicon substrate 209 via the first buried oxide film 211 is shown.
- the uppermost silicon layer is processed, and a second buried oxide film is buried in the gap.
- the buried oxide film (not shown) deposited on the silicon surface is removed by etching or polishing.
- a high-resistance polycrystalline silicon film and a low-resistance polycrystalline silicon film are deposited to form a resistance element R1.
- an insulating film such as silicon nitride and a low-resistance polycrystalline silicon film are deposited, the additional capacitor element Ce1 is formed.
- FIG. 11 is a top view of only the resonator 1 having the resonator structure of FIG.
- the three vibrators 1 and the coupling beam 61 that mechanically couples them may be the same material in the same layer.
- the vibrator 1 is preferably made of a material having good conductivity, that is, metal or silicon having a low resistivity.
- the coupling beam 61 is also conductive, the vibrators 1 are short-circuited and the configuration shown in FIG. 5 cannot be realized. Accordingly, it is desirable that the coupling beam 61 is entirely or partially insulated or has a high resistance.
- the coupling portion between the vibrators 1 is a high impedance conductor or insulator, an electrical short circuit between a plurality of vibrators is avoided, and a series connection to an input port of an input electrode of a plurality of MEMS resonance parts, an output electrode Can be connected in parallel to the output ports.
- the coupling beam portion also has a high resistance.
- the resonator 1, the resistance elements R1 to R3, and the additional capacitors (additional capacitance elements) Ce1 to Ce3 9 can be realized by diffusing high-concentration conductive impurities into the connected vibrator 1 support 1s to increase the conductivity.
- the MEMS resonator includes an input port to which an input voltage is applied, an output port that outputs an output current, and a plurality (N (N is 2 or more)) connected to the input port and the output port. Integer))) MEMS resonating part.
- Each MEMS resonating unit includes an input electrode connected to the input port, a vibrator facing the input electrode through a gap, and an output electrode facing the vibrator through the gap.
- the plurality of input electrodes are connected in series to the input port.
- N MEMS resonating units are connected in series to the input port.
- the voltage applied to each MEMS resonance unit is approximately equal to the voltage obtained by dividing the input voltage applied to the input port by N, so that the minimum input voltage at which the MEMS resonance unit performs nonlinear resonance is increased. Therefore, the input voltage margin until the MEMS resonator reaches nonlinear resonance can be expanded.
- an oscillator having excellent noise characteristics (action due to a large current output) and easy waveform shaping (action due to high voltage tolerance) can be obtained. Can be configured.
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Abstract
Description
以下、実施の形態について、詳細に説明する。
先ず、キャパシティブ・バイファケーションについて、MEMS共振器を発振器として使用する場合を例に説明する。
次に、本実施の形態の変形例について説明する。図8は、本実施の形態によるMEMS共振器変形例100vの回路図である。MEMS共振器100vでは、各MEMS共振部11va、11vb、11vcにおいて、入力電圧を受ける電極として機能する入力電極3と対向する振動子1を各MEMS共振部からの出力電流を出力させる出力電極として機能させるように構成される。入力電極3と振動子1との間のギャップは、入力側静電容量7(容量Ci)を形成し、当該静電容量7は、共振器100における出力側静電容量9としても機能する。
図9は、第2の実施の形態によるMEMS共振器100aの斜視図である。MEMS共振器100aは3個のMEMS共振部を備え、各共振部の振動子1同士を結合梁61によって機械的に結合している。振動子1は、その梁の一方の固定端近辺同士を結合梁61によって結合されている。すなわち、結合梁61は、振動子1同士を機械的に結合するための結合部を構成する。
実施の形態によるMEMS共振器は、入力電圧が印加される入力ポートと、出力電流を出力する出力ポートと、該入力ポートおよび該出力ポートに接続された複数の(N個(Nは2以上の整数。))MEMS共振部を有する。各MEMS共振部は、入力ポートに接続される入力電極と、ギャップを介して入力電極と対向する振動子と、ギャップを介して振動子と対向する出力電極とを備える。そして、複数の入力電極は、入力ポートに対して直列に接続される。
3 ・・・ 入力電極
5 ・・・ 出力電極
7 ・・・ 入力側静電容量
9 ・・・ 出力側静電容量
11a・・・ MEMS共振部
11b・・・ MEMS共振部
11c・・・ MEMS共振部
11va・・ MEMS共振部
11vb・・ MEMS共振部
11vc・・ MEMS共振部
13a ・・・ 付加容量
13b ・・・ 付加容量
13c ・・・ 付加容量
15a ・・・ インダクタンス素子
15b ・・・ インダクタンス素子
15c ・・・ インダクタンス素子
19 ・・・ 入力ポート
21 ・・・ 出力ポート
61 ・・・ 高抵抗結合梁
63 ・・・ 増幅器
85 ・・・ MEMS共振器
99 ・・・ MEMS共振部
100 ・・・ MEMS共振器
100a・・・ MEMS共振器
100v・・・ MEMS共振器
Ce1 ・・・ 付加容量素子
Ce2 ・・・ 付加容量素子
Ce3 ・・・ 付加容量素子
R1 ・・・ 抵抗素子
R2 ・・・ 抵抗素子
R3 ・・・ 抵抗素子
Claims (12)
- 入力電圧が印加される入力ポートと、
出力電流を出力する出力ポートと、
振動子を備え、前記入力ポートおよび前記出力ポートに接続された、N個(Nは2以上の整数)のMEMS共振部とを有し、
前記N個のMEMS共振部は、前記入力ポートに対して直列に接続される、MEMS共振器。 - 前記N個のMEMS共振部は、略同一の機械的共振周波数を有する、請求項1に記載のMEMS共振器。
- 前記N個のMEMS共振部の振動子同士は結合部によって機械的に結合されている、請求項1に記載のMEMS共振器。
- 前記結合部は、前記振動子の抵抗値よりも電気的に高インピーダンスである、請求項3に記載のMEMS共振器。
- 前記MEMS共振部において、前記振動子と、前記振動子とギャップを介して対向する電極とによって入力側静電容量が形成され、
前記N個のMEMS共振部の少なくとも1つのMEMS共振部の入力側静電容量は、他の1つのMEMS共振部の入力側静電容量と付加容量素子を介して接続され、
前記少なくとも1つのMEMS共振部の入力側静電容量と前記他の1つのMEMS共振部の入力側静電容量とは、前記付加容量素子を介して、前記入力ポートに対して直列に接続され、前記付加容量素子の容量は、前記MEMS共振部の入力側静電容量よりも大きい、請求項1に記載のMEMS共振器。 - 前記付加容量素子は、前記MEMS共振部と同一基板上に形成される、請求項5に記載のMEMS共振器。
- さらに、前記少なくとも1つのMEMS共振部の入力側静電容量と前記付加容量素子との結線部の直流電位を規定するインピーダンス素子を有し、該インピーダンス素子のインピーダンスは前記付加容量素子のインピーダンスよりも大きい、請求項5に記載のMEMS共振器。
- 前記インピーダンス素子は、前記MEMS共振部と同一基板上に形成される、請求項7に記載のMEMS共振器。
- 前記MEMS共振部において、前記振動子と、前記振動子とギャップを介して対向する入力電極とによって入力側静電容量が形成され、前記振動子と、前記振動子とギャップを介して対向する出力電極とによって出力側静電容量が形成され、
前記N個のMEMS共振部の1つのMEMS共振部の入力電極が前記入力ポートに接続され、前記N個のMEMS共振部の1つのMEMS共振部の振動子が他の1つのMEMS共振部の入力電極と接続されて、前記N個のMEMS共振部は前記入力ポートに対して直列に接続され、
前記N個のMEMS共振部の出力電極が前記出力ポートに接続される、請求項1に記載のMEMS共振器。 - 前記MEMS共振部において、前記振動子と、前記振動子とギャップを介して対向する電極とによって静電容量が形成され、
前記N個のMEMS共振部の1つのMEMS共振部の振動子および電極の一方が、前記入力ポートに接続され、前記1つのMEMS共振部振動子および電極の他方が他の1つのMEMS共振部の振動子および電極の一方と接続されて、前記N個のMEMS共振部は前記入力ポートに対して直列に接続される、請求項1に記載のMEMS共振器。 - 前記N個のMEMS共振部は、前記出力ポートに対して並列に接続される、請求項1に記載のMEMS共振器。
- 請求項1に記載のMEMS共振器を備えた発振器。
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US9660654B2 (en) * | 2012-10-26 | 2017-05-23 | California Institute Of Technology | Synchronization of nanomechanical oscillators |
US9825610B1 (en) * | 2014-02-28 | 2017-11-21 | Hrl Laboratories, Llc | Tunable stiffness mechanical filter and amplifier |
US9716485B2 (en) * | 2014-06-08 | 2017-07-25 | Board Of Trustees Of Michigan State University | Frequency divider apparatus |
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