78results 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 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.

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.

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.

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.

The invention relates to an ultrasonic motor control integration circuit based on a voltage controlled oscillator. A semiconductor chip is integrated by a voltage controlled oscillation circuit which is used for generating a rectangular wave signal within a certain frequency range, a frequency phase separation circuit which is used for generating a plurality of phase separation rectangular wave signals with given phase difference according to the received rectangular wave signals, a dead zone regulation circuit which is used for generating corresponding rectangular wave output signals containing low-level dead zone in an initial high-level zone according to the phase separation rectangular wave signals, an output driving circuit which is used for reinforcing the carrier capability on the rectangular wave output signals so as to form correspondingly output rectangular wave control signals, a DC offset circuit which is used for providing DC powers for all circuits. The ultrasonic motor control integration circuit has the main advantages that the ultrasonic motor control integration circuit can prevent the damage of the circuit caused by that the switch tube is directly conducted by an inversion switch power tube in a push-pull circuit in the ultrasonic motor as the turn-off delay a signal with the phase difference of 180 DEG may be directly used as the control signal of the motor switch tube.

An electronic device includes: a substrate; a resonation device; a heating element; a first support which is mounted on the substrate and supports the resonation device; and a second support which supports the substrate, in which the relationship between thermal conductivity λ1 of the first support and thermal conductivity λ2 of the second support satisfies an expression, λ1>λ2.