576 results about "Harmonic oscillator" patented technology

Exemplary embodiments of the invention provide a system, method and apparatus for spread spectrum functionality for a free-running, reference harmonic oscillator. In an exemplary embodiment, an apparatus comprises a reference oscillator adapted to provide a reference signal having a reference frequency; and a spread spectrum controller adapted to control the reference oscillator to generate a spread-spectrum reference signal at a plurality of different reference frequencies during a predetermined or selected time period. An exemplary apparatus may also include a coefficient register adapted to store a plurality of coefficients and a plurality of controlled reactance modules responsive to a corresponding coefficient of the plurality of coefficients to modify an amount of reactance effectively coupled to the reference oscillator. An exemplary spread spectrum controller is further adapted to sequentially modify the plurality of coefficients during the predetermined time period to provide the spread spectrum reference signal.

The invention discloses an LTCC (Low Temperature Co-fired Ceramic) lowpass filter which comprises an input end and an output end, wherein the input end is connected with input ends of the first pair of LC parallel harmonic oscillators (L2, C2), output ends of the first pair of LC parallel harmonic oscillators are connected with input ends of the second pair of LC parallel harmonic oscillators (L4, C4), output ends of the second pair of LC parallel harmonic oscillators are connected with input ends of the third pair of LC parallel harmonic oscillators (L6, C6), and output ends of the third pair of LC parallel harmonic oscillators are connected with the output end of the lowpass filter; parallel grounding capacitors C3 are arranged between connecting points of the first pair of LC parallel harmonic oscillators and the second pair of LC parallel harmonic oscillators and ground, parallel grounding capacitors C5 are arranged between connecting points of the second pair of LC parallel harmonic oscillators and the third pair of LC parallel harmonic oscillators and the ground, and parallel grounding capacitors C7 are arranged between connecting points of the third pair of LC parallel harmonic oscillators and the ground. The filter adopts a standard encapsulation structure, has the advantages of small volume, low cost, good frequency selecting property, good temperature stability and the like and is favorable to massive production.

The invention discloses a miniature hemispherical resonant gyroscope based on an SOI (silicon on insulator) silicon slice and a manufacturing method of the miniature hemispherical resonant gyroscope, belonging to the field of micro/nano processing and manufacturing. A driving electrode 16 and a sensitive electrode 17 of the gyroscope are composed of independent silicon blocks formed by dividing a structural silicon body 1 internally provided with a hemispherical hollow cavity through a plurality of radial structural silicon grooves 14, the area of the driving electrode 16 and the sensitive electrode 17 relative to a hemispherical harmonic oscillator 8 is increased, and the driving force and the detecting capacitance are increased to facilitate the driving and signal detection of the hemispherical harmonic oscillator 8; and meanwhile, the independent silicon blocks formed by the divided structural silicon body 1 enables a silicon dioxide sacrificial layer 6 to be corroded more easily. The gyroscope processing method disclosed by the invention is used for processing a supporting body hollow cavity 10 through ICP (inductively coupled plasma) etching and depositing conductive polysilicon to form a cylindrical supporting body 11, so that the size of the supporting surface of the supporting body is controllable to beneficially control the vibration mode distribution of the hemispherical harmonic oscillator 8; and meanwhile, when processing the driving electrode 16 and the sensitive electrode 17, the back surfaces of the driving electrode 16 and the sensitive electrode 17 are firstly processed to protect the hemispherical harmonic oscillator 8 from being corroded.

The invention discloses a harmonic oscillator of a solid fluctuation gyro, which comprises a resonance ring (1), a resonance transmission part (2), a chassis (3) and a piezoelectric element (4), wherein, the resonance ring (1) is connected with the chassis (3) through the resonance transmission part (2), the resonance transmission part (2) is composed of support beams (21) which are uniformly distributed in the circumferential direction, and the piezoelectric element (4) is arranged on the support beams (21). The invention further discloses the solid fluctuation gyro provided with the harmonic oscillator. The solid fluctuation gyro and the harmonic oscillator of the invention have the advantages of high sensitivity, good sensing effect, convenient machining, low machining cost, simple mechanical balance procedure and the like.

The invention discloses a piezoelectric disc micromechanical gyroscope which comprises a disc harmonic oscillator with a supporting column, three driving electrodes, three detecting electrodes, three monitoring electrodes and three balancing electrodes. The three driving electrodes, the three detecting electrodes, the three monitoring electrodes and the three balancing electrodes are distributed along a circle of the end face of the disc harmonic oscillator respectively. The piezoelectric disc micromechanical gyroscope utilizes a special vibration mode of the disc harmonic oscillator to work, alternating current voltage is applied to the three driving electrodes on the disc harmonic oscillator, and the disc harmonic oscillator vibrates in a driving mode due to inverse piezoelectric effect. When input angular velocity exists, a vibration mode of the disc harmonic oscillator is turned to a detecting mode. By means of sensitive signals generated through piezoelectric positive effect at detecting electrode positions, the input angular velocity is obtained after the sensitive signals are processed through a peripheral circuit. The piezoelectric disc micromechanical gyroscope has the advantages of being simple in structure and small in size, having high Q value and the like and does not need vacuum packaging.

Exemplary embodiments of the invention provide a system, method and apparatus for frequency calibration of a free-running, reference harmonic oscillator. An exemplary system comprises the harmonic oscillator, a frequency divider, a comparator, and a reactance modulator. The reference harmonic oscillator includes a plurality of switchable reactance modules controlled by corresponding coefficients, and provides an oscillation signal having an oscillation frequency, which is divided or multiplied by the frequency divider to provide an output signal having an output frequency. The comparator compares the output frequency to an externally supplied reference frequency using first and second predetermined levels of discrimination, and provides first or second comparison signals when the output frequency is higher or lower than the reference frequency. The reactance modulator determines a plurality of coefficients to control switching of the plurality of switchable reactance modules to increase or decrease a reactance of the oscillator in response to the first and second comparison signals.

The invention provides a silicon micro-resonant mode pressure sensor based on a differential motion structure with a coupling beam, relating to a sensor. The silicon micro-resonant mode pressure sensor is provided with a harmonic oscillator, a rectangular silicon island, a rectangular pressure sensitive diaphragm, a silicon frame and a lower layer of glass, wherein the harmonic oscillator is provided with supporting beams, the coupling beam, a movable comb exciting electrode, a movable comb detection electrode, a fixed comb exciting electrode, a fixed comb detection electrode and a vibration mass block; the rectangular pressure sensitive diaphragm is fixed in the silicon frame; the rectangular silicon island is arranged at the position where the stress deflection angle of the rectangular pressure sensitive diaphragm is maximum; the harmonic oscillator is suspended on the surface of the rectangular pressure sensitive diaphragm by the rectangular silicon island through the supporting beams and the supporting beams are connected with the rectangular silicon island; a lead wire electrode is connected with the harmonic oscillator through a flexible beam; the supporting beams are arranged at four corners of the harmonic oscillator; the vibration mass block is connected with the rectangular silicon island and a mechanical coupling beam arranged at the middle part of the harmonic oscillator is used for connecting the vibration mass block; the vibration mass block and the coupling beam are both in suspended states and the vibration mass block is provided with a hole; and the lower layer of glass is arranged at the bottom of the silicon frame.

The invention provides a nested annular MEMS oscillation gyro with period distribution type concentrated mass blocks. The gyro comprises a nested annular harmonic oscillator with the period distribution type concentrated mass blocks, and an electrode which is arranged inside/outside the nested annular harmonic oscillator; the nested annular harmonic oscillator comprises a nested annular flexible frame, the mass blocks arranged on the nested annular flexible frame, and anchors for fixing the oscillator; the whole harmonic oscillator is fixedly anchored with a base by the anchor on the center of the harmonic oscillator; the nested annular flexible frame comprises nested rings and spoke-shaped supporting beams; the mass blocks can be additionally arranged on the nested annular flexible frame in a plurality of kinds of manners; and the electrode can be arranged inside/outside the harmonic oscillator, or the electrodes are arranged inside and outside the harmonic oscillator. The gyro has the relatively high thermo-elastic property Q value, relatively large resonance oscillation mass, and relatively large driving amplitude; and as the design of the internal electrode is adopted or the design of the internal and external electrodes is adopted, the gyro also has the advantages that the capacitance detection area is large, the number of detection and control electrodes is large and the like.

The invention provides a micro-mechanical magnetic field sensor and a preparation method thereof and belongs to the field of micro-electro-mechanical systems. The method comprises the following steps of: manufacturing metal coils and a pad on a device structure layer; manufacturing a device structure by dry etching; and releasing the device structure to form a harmonic oscillator. The harmonic oscillator of the micro-mechanical magnetic field sensor provided by the invention operates in an extension mode, so induced electromotive force which is generated by each section of metal cutting magnetic induction line on each metal coil can be superposed, and the intensity of an output signal is improved. Moreover, the micro-mechanical magnetic field sensor has the advantages of low power consumption, simple driving/detection circuit, simple process, high industrial value and the like and is slightly influenced by temperature.

The invention discloses a dual frequency multiplexer by which a first and second coaxial harmonic oscillator type band pass filters are disposed in a box. The box includes a base body, a cover plate and a cover body. The two coaxial harmonic oscillator type hand pass filters are located on the base body and spaced each other by a metal plate; the multiplexer port, first and second ports are positioned on lateral side of the base body. The blocking capacitors are contained in the coaxial chamber of the two coaxial harmonic oscillator type band pass filters. The cover plate is secured on the base body; the first and second direct current circuits are placed on the cover plate; the low pass filters of the first and second direct current circuits are fixed on an edge of a top surface of the coaxial chamber by means of a support member; the cover body and the base body are fastened with each other. The blocking capacitors each are of distributed parameter capacitor. Utilization of distributed blocking capacitors makes the product of the invention small. Moreover, improvement of the structure of the invention brings effect such as less differential loss, large power capacity, as well as high isolation degree between circuits.

A high efficiency harmonic engine based on a resonantly reciprocating piston expander that extracts work from heat and pressurizes working fluid in a reciprocating piston compressor. The engine preferably includes harmonic oscillator valves capable of oscillating at a resonant frequency for controlling the flow of working fluid into and out of the expander, and also preferably includes a shunt line connecting an expansion chamber of the expander to a buffer chamber of the expander for minimizing pressure variations in the fluidic circuit of the engine. The engine is especially designed to operate with very high temperature input to the expander and very low temperature input to the compressor, to produce very high thermal conversion efficiency.

The invention relates to a piezoelectric thin film, a piezoelectrics and manufacturing method thereof, a piezoelectrics harmonic oscillator, a actuator element and a phsical sensor. A piezoelectric thin film of the present invention includes an aluminum nitride thin film that contains scandium. A content ratio of scandium in the aluminum nitride thin film is 0.5 atom % to 50 atom % on the assumption that a total amount of the number of scandium atoms and the number of aluminum atoms is 100 atom %. According to this arrangement, the piezoelectric thin film of the present invention can improve a piezoelectric response while keeping characteristics of elastic wave propagation speed, Q value, and frequency-temperature coefficient that the aluminum nitride thin film has.

A voltage controlled oscillator circuit and method comprising: a harmonic oscillator having a cross-coupled NFET devices (T1, T2) and an LC tank circuit (L1, L2, C) performing oscillation; a series voltage regulator (210) regulating voltage applied to the harmonic oscillator via a PFET device (T3) and differential amplifier (R); and a tuning circuit (220) having voltage controlled capacitance 'Zero-Vt' NFET devices (T4, T5) controlling oscillation of the harmonic oscillator. A differential output buffer (B) provides output buffering to a subsequent stage. This provides advantages that: operation at low supply voltages is facilitated and the sensitive oscillator cell is decoupled from the main supply noise offering improved phase noise performance; the output swing of the oscillator has a well controlled common-mode value which can be selected to most efficiently drive a following stage; and using 'Zero-Vt' NFETs facilitates the use of a lower supply voltage.

The invention discloses a resonant gyroscope closed-loop control method and system. The method comprises the following steps: vibration displacement signals are acquired and converted in driving and detecting directions in driving and detecting modes; a driving displacement signal generates a control signal through a driving loop and the control signal is input into the driving electrode to excitethe harmonic oscillator to vibrate at a constant amplitude in the driving direction; a detection displacement signal is divided into two paths, and one path is input into the detection electrode through the quadrature error suppression loop and the other path generates a detection signal through a force balance loop and superposes the detection signal with a correction demodulation signal; demodulation and amplitude operation is performed on the signals demodulated by the two loops; amplitude results are summed and PID control operation is performed to obtain a scale compensation signal; andthe amplitude of the signal with the disturbance feedback force is regulated by using the scale compensation signal, and the signal subjected to the amplitude regulation is input into the detection electrode to realize automatic compensation of the scale factor of the gyroscope. According to the method and the system, the complete closed-loop control function of the resonant gyroscope is realized,the problems of poor adaptability, time consumption, labor consumption and the like in the prior art are solved, and the stability of the scale factor of the gyroscope in the running state is improved.

The invention relates to a metamaterial which comprises at least one metamaterial sheet layer, wherein each metamaterial sheet layer comprises a substrate and a metal micro structure attached on the substrate, the metal micro structure comprises a plurality of fan-shaped structures obtained after at least one straight line with a certain width, which passes through the center of a circle, is etched on a solid circular metal sheet. The invention also provides a filter using the metamaterial. The filter comprises a resonant cavity and a harmonic oscillator arranged inside the resonant cavity, wherein the harmonic oscillator is made of the metamaterial. The dielectric constant of the metamaterial with the metal micro structure is greatly enhanced, and the metamaterial is applied to the filter so that the miniaturization of the filter is facilitated.

The invention relates to a harmonic oscillator of a gyroscope and a balancing method thereof, in particular disclosing a cup-shaped harmonic oscillator of a cup-shaped fluctuated gyroscope and a mechanical balancing method. The cup-shaped harmonic oscillator comprises a side wall and a chassis fixedly connected to the bottom of the side wall, wherein the side wall comprises a harmonic oscillation ring at the upper part and an oscillation transfer part at the lower part, the center of the chassis is provided with an installation base, the top of the harmonic oscillation ring is uniformly distributed with modifying tanks are uniformly distributed on the top of the harmonic oscillation ring along a circumferential direction, and modifying holes are uniformly distributed on the chassis. The balancing method of the cup-shaped harmonic oscillator comprises the following steps of: firstly carrying out static balance regulation on the harmonic oscillator to make the mass center of the harmonic oscillator coincide with an ideal central shaft; then modifying the harmonic oscillation ring to reduce the frequency difference of the harmonic oscillator to an error range; modifying the chassis of the harmonic oscillator again to reduce the frequency difference of the harmonic oscillator to an expected value range; and finally modifying the chassis of the harmonic oscillator to make the oscillation mode of the harmonic oscillator consistent with the expected direction. The harmonic oscillator and the mechanical balancing method in the invention have the advantages of simple operation, convenient processing, high precision and efficiency, low cost and the like.

The invention discloses an equilateral polygon discal MEMS resonant gyro which comprises a sensitive structure, wherein the sensitive structure includes a harmonic oscillator, fixed anchor points forfixing the entire harmonic oscillator are arranged in the center of the harmonic oscillator, the harmonic oscillator takes the shape of an equilateral polygon disc which is in axial symmetry entirely,the harmonic oscillator includes a plurality of concentric equilateral polygon resonant rings, the concentric equilateral polygon resonant rings are connected through spokes, the fixed anchor pointsare connected with adjacent concentric equilateral polygon resonant rings through the spokes, the plurality of concentric equilateral polygon resonant rings are radially distributed by taking centersof the fixed anchor points as centers, grooves are formed between adjacent equilateral polygon resonant rings and spokes, and electrodes are arranged in the grooves. The equilateral polygon structuresare entirely in line connection without arc line, thereby having a small edge error effect and a relatively smaller symmetry error. Therefore, the resonant frequency of two operating modes are smallin splitting.

The invention discloses an ultra wide-band filter based on double minor matters loading harmonic oscillator. The ultra wide-band filter based on double minor matters loading harmonic oscillator comprises a micro-strip substrate, a front part, a reverse part and an input\output port. The front part and reverse part are respectively located on the two sides of the micro-strip substrate. The reverse part is regarded as a metal earth plate of the filter. The input\output port has two ports which are respectively a first input\output port and a second input\output port. The front part comprises a first uniform transmission line unit, a second uniform transmission line unit, a first paralleled coupler feeder, a second coupler feeder, and a double minor matters loading harmonic oscillator. The ultra wide-band filter is compact in structure, small in size, low in cost, and good in speciality.

A feedback controlled artificial sphincter system for anus is composed of an internal unit consisting of wireless communication module, the artificial sphincter which comprises pressure sensing bag, miniature pressure sensor, clamping bag, clamping pressure sensor and liquid bag, the artificial sphincter controller which comprises the regulating circuits for said sensors, miniature hydraulic pump and its driver, and single-chip microprocessor, and the power module, and an external unit consisting of wireless transmitting coil on skin, harmonic oscillator, wireless communication module, and single-chip microprocessor system.