81results about How to "Oscillation frequency is stable" patented technology

Exemplary embodiments provide a piezoelectric resonator element, to reduce the reaching of an attenuating vibration of a main vibration to a marginal edge of the piezoelectric resonator element, as well as to stabilize an oscillating-frequency without worsening the CI value, nor inducing another vibration mode. The piezoelectric resonator element having a thickness shear vibration as a main vibration, a first groove and a second groove formed so as to surround the center part of a main surface, and the thickness at the first groove and the second groove structured to be between 70% to 96%, inclusive, of the thickness of the center part of the resonator element.

A frequency generator which can perform stable frequency oscillation unaffected by temperature variation. A frequency generator having a differential amplifier (1) having an LC resonance circuit (10) as a load and buffer circuits (21, 22) feeding back an output of the differential amplifier to its input, wherein a temperature coefficient converter (5) converting an output voltage of a reference voltage generator (4) and its temperature dependence to a voltage having a predetermined voltage and temperature coefficient and outputting it is provided to control bias currents IEF of emitter follower circuits to be in proportion to temperature variation. There are a characteristic in which delay time of the emitter follower circuits constructing the buffer circuits is in inverse proportion to a transconductance of transistors and a characteristic in which the transconductance is in inverse proportion to temperature and is in proportion to the bias currents IEF. An oscillation frequency stable to temperature variation can be obtained.

Electrically conductive layers 1a and 2a connected to each other via a contact form one inductor, while electrically conductive layers 1b and 2b connected to each other via other contact form the other inductor. Since the areas defined by the loops forming these two inductors are equal to each other, the inductances of the inductors are also equal to each other. Between both the inductors, the lengths in the loop of the portions (the conductive layers 1a and 1b) formed on a lower interlayer insulating film are equal to each other, while the lengths in the loop of the portions (the conductive layers 2a and 2b) formed on an upper interlayer insulating film are also equal to each other. This allows external disturbances such as parasitic capacitance to affect both the inductors equally. Accordingly, a voltage controlled oscillator incorporating the invention can stably provide undistorted sinusoidal oscillation signals.

The invention discloses an optoelectronic oscillator which comprises a laser device used for outputting optical carriers. The laser device is connected with an optoelectronic circulation circuit for forming an optoelectronic mixing resonant cavity. The optoelectronic oscillator further comprises an injection phase-locking module and a stable control module, the injection phase-locking module is used for injecting a locking signal to the optoelectronic circulation circuit to achieve side-mode suppression, and the stable control module is used for pilot control so as to compensate delay fluctuation of the optoelectronic circulation circuit. The injection phase-locking module is arranged to inject the locking signal to the optoelectronic circulation circuit to achieve side-mode suppression, the stable control module is arranged to extract delay fluctuation of all devices of the optoelectronic circulation circuit and carry out corresponding delay fluctuation compensation, so that the aim of stabilizing oscillation frequency is achieved, and therefore low-phase-noise single-mode stable output of the optoelectronic oscillator is achieved. Due to the fact that pilot control and circulating oscillation locked by injecting the locking signal are carried out in different frequency bands, mutual interference is avoided, and the parasitic effect of control circuit noise on an oscillation signal is effectively avoided.

The invention provides a relaxation oscillator with a low temperature drift characteristic and a debug method thereof, and relates to an oscillator field. The oscillator circuit comprises a bias module, a register and an oscillation module. The oscillation module is composed of a switching structural circuit, a comparator and a capacitor charging and discharging circuit. The oscillator uses switching structural circuit as a core, and a debug method of a current adjusting mode is combined, such that monolithic integration of the relaxation oscillator is realized while the oscillation frequency of the oscillator obtains excellent temperature stability. The disclosed switching structural circuit in the invention is provided for enable the relaxation oscillator to acquire the good temperature stability. According to a working principle of the circuit, the relaxation oscillator always possesses the good temperature stability no matter threshold voltages with different temperature characteristics are provided to the comparator by components in the switching structural circuit. The relaxation oscillator with the low temperature characteristic in the invention and the debug method thereof are suitable for any standard CMOS technologies.

The present invention relates to electric appliances for personal care, in particular electric shavers, comprising a magnetic linear drive unit having first and second drive components supported for linear displacement relative to each other by a first spring device and adapted to magnetically interact with each other, and a second spring device for movably linking the drive unit to a structural element of the appliance. The first spring device is made from plastics such as long-chained PPS, whereas the second spring device is made from steel.

A crystal oscillator of the present invention includes: a substrate provided in a package; a heating device arranged as surrounding an internal area of the substrate on at least one of the surfaces of the substrate; a crystal resonator or a crystal element and an oscillation circuit unit provided in an area enclosed by the heating device; a thermosensitive element which detects a temperature in an area enclosed by the heating device; and a control unit for controlling a heating value applied to the heating device based on a detection result of the thermosensitive element.

The invention discloses a ring oscillator with technology and temperature compensation and belongs to the field of oscillators. The ring oscillator with technology and temperature compensation aims to solve the problem of the prior art that the ring oscillation frequency of a ring oscillator is affected by technological parameters and temperature change. The ring oscillator comprises a delay unit, a temperature compensation module and a technology compensation module, wherein the delay unit comprises an odd number of inverters with a capacitor as a load, and a main circuit of the temperature compensation module is a two-level temperature compensation type band-gap reference current source, generates supply current I_pow basically irrelevant to temperature and provides the supply current to the delay unit so that oscillation frequency is not affected by temperature change basically; the technology compensation module generates voltage which changes synchronously with technology by means of a MOS tube connected with a diode, and reflects the voltage on supply voltage ULdo_out of the delay unit through LDO for technological compensation.

A frequency generator which can perform stable frequency oscillation unaffected by temperature variation.A frequency generator having a differential amplifier (1) having an LC resonance circuit (10) as a load and buffer circuits (21, 22) feeding back an output of the differential amplifier to its input, wherein a temperature coefficient converter (5) converting an output voltage of a reference voltage generator (4) and its temperature dependence to a voltage having a predetermined voltage and temperature coefficient and outputting it is provided to control bias currents IEF of emitter follower circuits to be in proportion to temperature variation. There are a characteristic in which delay time of the emitter follower circuits constructing the buffer circuits is in inverse proportion to a transconductance of transistors and a characteristic in which the transconductance is in inverse proportion to temperature and is in proportion to the bias currents IEF. An oscillation frequency stable to temperature variation can be obtained.

A circuit device includes a processor adapted to perform a signal processing of temperature compensation of an oscillation frequency based on temperature detection data from an external temperature sensor disposed outside the circuit device to output frequency control data, and an oscillation signal generation circuit adapted to generate an oscillation signal with the oscillation frequency corresponding to the frequency control data using the frequency control data and a resonator disposed in a thermostatic oven.

The invention discloses a dimming LED constant current driving system based on a transistor oscillating circuit. The system is characterized in mainly comprising a processing chip U; a triode VT2; a capacitor C4; a protection circuit; a lowpass filtering circuit connected between the protection circuit and the processing unit U in series; a linear dimming circuit connected between the protection circuit and the base of the triode VT2 in series; a resistor R1 connected between the collector of the triode VT2 and the LD pin of the processing chip U in series; and the transistor oscillating circuit connected between the cathode of the capacitor C4 and the RI pin of the processing chip U in series. The anode of the capacitor C4 is connected with the emitter of the triode VT2. According to the system, the brightness of the LED can be adjusted according to demands. Compared with the traditional LED driving system, the system has the advantages that the linearity when the brightness of the LED is adjusted is high, the LED can work more stably, and the twinkling phenomenon is avoided.

An oscillation apparatus corrects a setting value for an output frequency based on a detection result of an environmental temperature. The oscillation apparatus includes a first crystal unit, a second crystal unit, an integrated circuit chip, and a container. The first crystal unit includes first excitation electrodes on respective surfaces of a crystal element. The second crystal unit includes second excitation electrodes on respective surfaces of a crystal element. The integrated circuit chip includes a first oscillation circuit, a second oscillation circuit, and a correction unit. The container houses the first crystal unit, the second crystal unit, and the integrated circuit chip. Assuming that distances from a gravity center position of the integrated circuit chip to respective gravity center positions of the first excitation electrodes and the second excitation electrodes in plan view are denoted by D1 and D2, D1 / D2 is within a predetermined range close to 1.05.

The present invention provides an oscillator start-up control circuit capable of shortening the start-up time, stably controlling the start-up time, and stabilizing the oscillation frequency after the start-up of the oscillation circuit. The oscillation circuit (1) is as follows: the input and output of the inverter (14) are connected to the two ends of the crystal oscillator (15) and the two ends of the resistor (16), and the input is connected to the MOS variable capacitor (10) Drain, connect the output to the drain of the MOS variable capacitor (11), connect the source of the MOS variable capacitor (10) to the fixed capacitor (12), connect the source of the MOS variable capacitor (11) to Fixed capacitor (13), connect the other end of the fixed capacitor (12, 13) to GND. Furthermore, the resistor (18) and the switch (7) are connected to the gate of the MOS variable capacitor (10), the resistor (19) and the switch (8) are connected to the gate of the MOS variable capacitor (11), and the resistor (18) is connected to the gate of the MOS variable capacitor (11). , 19) the other ends are connected to each other, and then connected to the voltage control circuit (3).

Provided is a control circuit for a thermostatic oven in an oven controlled crystal oscillator, which is capable of further improving stability of an oscillation frequency. A control circuit in which a thermistor whose resistance value changes according to a temperature outputs a signal according to the ambient temperature of the thermostatic oven inside the oscillator, an operational amplifier outputs a signal according to a difference between the output of the thermistor and a reference signal, a power transistor amplifies the output of the operational amplifier, and a heater generates heat based on a collector voltage of the power transistor, is provided with a temperature sensor circuit having a transistor with a base to which the output of the operational amplifier is input. The control circuit outputs a collector voltage of the transistor as an internal temperature signal which changes according to a temperature inside the oscillator.

A crystal unit and a thermistor with negative resistance-temperature characteristics are housed in a thermostatic oven heated by a heater. A transistor driving the heater is controlled by an output of a differential amplifier, the thermistor is placed between a power supply voltage and an inverting input of the amplifier, and a first resistor used to adjust the temperature of a zero temperature coefficient point of the crystal unit is installed between the inverting input and a ground point. A second resistor is installed between the power supply voltage and a non-inverting input of the amplifier and a third resistor is installed between the non-inverting input and ground point. One of the second and third resistors is a resistor assembly made up of a plurality of resistance elements and one of these resistance elements is provided with positive resistance-temperature characteristics and adapted to detect ambient temperature.

A battery powered concrete vibrator is provided with a vibration head; a brushless DC motor disposed in the vibration head; a drive shaft disposed in the vibration head, rotatably disposed through the brushless DC motor, and operatively driven by the brushless DC motor, the drive shaft including a lengthwise groove on an outer surface, thereby rendering the drive shaft unbalanced; and a groove-shaped vibration member put on the drive shaft. The drive shaft can impart rotation to the vibration member.

The present invention relates to temperature measuring method and device, and is especially temperature measuring method and device with thermistor set in special circuit. The temperature information the thermistor senses is converted into digital temperature data in a microprocessor. The present invention features the thermistor connected serially in an RC multivibrator, the RC multivibrator with output connected to one of the interruption interface of microprocessor; the microprocessor counting the output pulses of the RC multivibrator under the timing interruption to obtain digital frequency data; and the table look-up process of the microprocessor to convert the digital frequency data into digital temperature data for corresponding control. The temperature measuring device is one RC multivibrator comprising two NOT gates, one resistor, one thermistor, one capacitor and one drive amplifier, and has low cost.

The invention relates to an efficient line scanning photo-curing imaging device and method. The device comprises a frame, wherein a liquid tank is arranged above the frame, a photosensitive resin is arranged in the liquid tank, a flexible transparent bottom is arranged at the bottom of the liquid tank, a linear module is arranged below the frame, a movable platform is arranged on the linear module, the moving direction of the movable platform is parallel to the longitudinal direction of a flexible transparent bottom, a support is arranged on the movable platform, a laser light source, a resonance type micro-electromechanical reflector and a rigid narrow-line wide window are arranged on the support, a light beam emitted by the laser light source is just printed on the resonance type micro-electromechanical reflector, the deflection axis of the resonance type micro-electromechanical reflector is parallel to the longitudinal plane of the flexible transparent bottom and is perpendicular tothe longitudinal center line of the flexible transparent bottom to coincide, rigid parts at the two sides of the rigid narrow-line wide window are in contact with the flexible transparent bottom andenable the rigid narrow-line wide window to be elastically deformed and tensioned, and the window direction of the rigid narrow-line wide window is consistent with that of the flexible transparent bottom. According to the efficient line scanning photo-curing imaging device, the scheme is economic and reasonable, the physical resolution is high, the light energy utilization rate is high, and the efficient line scanning photo-curing imaging device is easy to popularize and apply in large-scale, high-precision and high-efficiency photo-curing three-dimensional forming equipment.

Provided is an oscillation device capable of obtaining a stable oscillation frequency by compensating for a change in oscillation frequency caused with an elapse of operating time of a quartz-crystal oscillator. A difference value ΔF between a frequency difference between first and second quartz-crystal oscillators after a predetermined period of time has elapsed from a reference time and a frequency difference between the first and second quartz-crystal oscillators at the reference time is determined.

It is an object to provide an oscillator starting control circuit capable of shortening a starting time and stably controlling the starting time, and furthermore, stabilizing an oscillating frequency after starting an oscillating circuit. [Means for Resolution] An oscillating circuit (1) is a crystal oscillating circuit in which an input and an output of an inverter (14) are connected to both ends of a crystal oscillator (15) and both ends of a resistor (16), the input is connected to a drain of an MOS variable capacity (10), the output is connected to a drain of an MOS variable capacity (11), a source of the MOS variable capacity (10) is connected to a fixed capacity (12), a source of the MOS variable capacity (11) is connected to a fixed capacity (13), and the other ends of the fixed capacities (12, 13) are connected to a GND. Furthermore, a resistor (18) and a switch (7) are connected to a gate of the MOS variable capacity (10), a resistor (19) and a switch (8) are connected to a gate of the MOS variable capacity (11), and the other ends of the resistors (18, 19) are connected to each other, and furthermore, to a voltage control circuit (3).

The invention discloses a low power consumption oscillator circuit with selectable frequency. The low power consumption oscillator circuit comprises a frequency selection unit (1), a bias current unit(2) and an oscillation unit (3); wherein the frequency selection unit (1) generates a frequency selection signal F-sel and inputs the same to the bias current unit (2), the bias current unit (2) provides charging current I1, I2 for the oscillation unit (3), and the oscillation unit (3) generates an OSC clock signal under the action of I1, I2. The low power consumption oscillator circuit has the advantages of having a simple circuit structure, eliminating a comparator and a control part in the traditional OSC, and having a small chip area and low power consumption; the frequency selection unitcan change and select the OSC frequency, so that the oscillation unit switches different modes, thereby being flexible and variable; and the current sources I1, I2 mirror current via a cascade current mirror, so that the stability of the generated current is high, the stability of the OSC oscillation frequency is realized, and the process drift is significantly inhibited.

The invention discloses a mode hopping suppression method and system for an opto-electronic oscillator. The method comprises steps: a phase frequency detector compares an output signal of a low frequency reference oscillator with a signal of a double-loop structure point frequency opto-electronic oscillator through frequency division of a frequency divider, and if the frequency difference betweenthe two exceeds the maximum traction range of a phase locked loop, a frequency control loop is triggered to start working; a frequency control loop generates a control signal and sends the control signal to a voltage-controlled radio frequency phase shifter in a short loop of the double-loop structure point frequency opto-electronic oscillator, the oscillation frequency of the double-loop structure point frequency opto-electronic oscillator is tuned until the frequency difference of output signals between the low frequency reference oscillator and the frequency divider falls in the traction frequency range of the phase locked loop, the frequency control loop is triggered to stop working. Mode hopping and frequency drift suppression on the double-loop structure point frequency opto-electronic oscillator can be realized based on one frequency control loop and the phase locked loop, and long-term stability of the oscillation frequency is achieved.

The invention relates to a heating device using an LC oscillating circuit. The heating device is composed of a DC power supply (1), a booster circuit (2), a diode switch (3), a control circuit (4), anLC oscillating circuit (5) and an electromagnetic induction heating element (9). The heating device of the invention realizes spontaneous oscillation, the current oscillation frequency is more stable, the energy loss is reduced, the equipment efficiency is higher, the heating state control is more flexible, and the device stability is good. The device of the invention meets the requirement of complicated working curve design for heating without burning cigarette.

The invention discloses a sand table type monitoring and commanding system, which comprises a sand table of a district map, a plurality of indication sensing modules, a bacon and a system master controller, wherein each indication sensing module is correspondingly arranged at the position of the district where a camera is actually arranged, and the position is marked on the sand table of the district map; and all the indication sensing modules are in communication connection via buses to form a network, and received wireless control signals sent by the bacon are transmitted to the system master controller via the communication buses. When the sand table type monitoring and commanding system is used for tracing images at the case scene of a monitoring center, a front camera image needing to be displayed is displayed on a designated monitor automatically, quickly and exactly as long as the bacon touches the indication sensing modules at corresponding positions of the sand table of the district map so as to overcome the disadvantages of complicated operation, time consumption and labor consumption of a conventional means. The sand table type monitoring and commanding system has the advantage of simple, convenient and flexible operation, so that public security officers can seize the opportunity to better overawe and crack down illegal and criminal activities.

An integrator (100) comprises an amplification and phase shifting element (170) with a feedback path (130) forming a loop and comprising a capacitive element (140). An input signal is summed into the loop, and the loop is arranged to oscillate at an oscillation frequency higher than the frequencies of interest in the input signal. The loop includes a filter (160) for attenuating the oscillation signal to ensure that the amplification and phase shifting element (170) can provide amplification for the input signal. The input signal is integrated and the integrated signal perturbs the zero crossings of the oscillation signal.

The invention relates to a sensor and a preparation method thereof, in particular, a quartz crystal resonance sensor welded by using low-temperature glass solder and a preparation method of the quartz crystal resonance sensor. An existing atomic force microscope is a micro cantilever structure-based force sensor, and the micro cantilever structure-based force sensor needs a huge optical detection system, and the quality factor and sensitivity of the micro cantilever structure-based force sensor are low, and as a result, the micro cantilever structure-based force sensor cannot be applied to extreme test conditions, while, with the quartz crystal resonance sensor of the invention adopted, the above situation can be avoided. According to the quartz crystal resonance sensor welded by using the low-temperature glass solder, two or four identically-sized-and-shaped quartz crystal resonance cantilevers are welded together through the low-temperature glass solder. The preparation method of the quartz crystal resonance sensor includes the following steps that: two or four identically-sized-and-shaped quartz crystal resonators are vertically fixed on a welding table; melt low-temperature glass solder is added at welding seams through electric soldering iron; and the two or four identically-sized-and-shaped quartz crystal resonators are welded together at 320 to 375 DEG C, so that the quartz crystal resonance sensor can be obtained. With the preparation method, a quartz crystal resonance sensor can be obtained.

To provide a high-frequency oscillator having a stable oscillation frequency with an excellent C / N characteristic. On the surface of a dielectric substrate 1, a plurality of lands on which IC chips 2 are mounted are formed in an array, and also a resonator electrode pattern 11 is formed. Furthermore, on the rear face of the dielectric substrate 1, a grounding electrode 16 is formed on the substantially entire face. One end of the resonator electrode pattern 11 is connected to a land on which a resonator connection terminal (Res terminal) of the IC chip 2 is mounted. The other end of the resonator electrode pattern 11 is connected to a land on which a grounding terminal (GND1 terminal) of an oscillating transistor in the IC chip 2 is mounted. The land which the GND1 terminal is mounted on, and also the resonator electrode pattern is connected to, conducts to the grounding electrode 16 formed on the rear face, through a wiring electrode pattern 14 and a through hole 15.