5results about How to "Stable output frequency" patented technology

The invention discloses a renovation method of an interferometer, the interferometer comprises an aged laser tube, the renovation method of the interferometer comprises the following steps: taking out the aged laser tube from the interferometer, sleeving one end of a new laser tube with a first C-shaped snap ring along the extension direction of the new laser tube, and sleeving the other end of the new laser tube with a second C-shaped snap ring; the thermal expansion coefficient of the C-shaped clamping ring is less than 3ppm / DEG C; after the new laser tube sleeved with the C-shaped clamping ring is installed in the metal sleeve, the metal sleeve internally provided with the new laser tube and the C-shaped clamping ring is embedded into the magnetic ring of the interferometer. According to the technical scheme, the stability of the output frequency of the new laser tube in the interferometer can be improved, and then the measurement accuracy of the renovated interferometer is improved.

The application belongs to the field of integrated circuit technology design, and relates to a passive and crystal-free GFSK transmitter chip, which comprises a radio frequency energy collection module, a power management module, a clock recovery module and an open-loop modulation transmitter module, the radio frequency energy collection module is used for wireless power supply, the power management module controls a power switch of the transmitter chip according to a power supply voltage value, when the power switch is opened, the power management module supplies power to the open-loop modulation transmitter module, the clock recovery module provides a reference frequency for the open-loop modulation transmitter module, and the open-loop modulation transmitter module multiplies the reference frequency to a radio frequency frequency required for transmission and transmits a data signal. The transmitter chip has the advantages of low power consumption and small size, is suitable for wireless sensor network nodes, and has strong commercial value.

The invention belongs to the field of chips, and provides a constant on-time circuit frequency compensation method in a chip, the method is applied to a frequency generation circuit of the chip, and the method comprises the following steps: based on a buffer, adding an input voltage or an output voltage of the chip to a resistor, and generating a compensation current on the resistor; the compensating circuit is used for mirroring the compensating current and supplying the obtained mirrored current to a comparator for regulating and controlling the current delay so as to regulate and control the output delay of the comparator, and the comparator is used for comparing the ramp signal with the output voltage and generating a control signal for regulating and controlling the frequency of the frequency generating circuit; the resistance is regulated and controlled, so that the output delay is matched with the output frequency of the chip; according to the invention, the problem that the internal frequency of the chip changes along with VIN or VOUT in the prior art can be solved.

This invention discloses a dual-channel time-sharing coordinated ultrasonic surgical control system and method, belonging to the field of ultrasonic surgical equipment. It includes a main unit control module, a peak power amplification unit, a dual-channel switching unit, a first handle interface, a second handle interface, an ultrasonic surgical handle (first and second), a foot pedal priority control module, and a parameter storage unit. The peak power amplification unit is a single-channel high-power amplification circuit with a peak output power of not less than 200W. The dual-channel time-sharing coordinated ultrasonic surgical control system and method of this invention uses a single-channel peak power amplification unit to power both handles, requiring only one set of power amplification and matching circuits. This significantly reduces the number of hardware components, lowers equipment production costs, assembly difficulty, and overall size. Simultaneously, it completely bypasses the core patent layout of foreign companies with dual-channel independent power output, resolving the patent infringement risk for domestic manufacturers.

The invention relates to the technical field of crystal oscillators, and provides a preparation method of a surface-mounted temperature compensation crystal oscillator and the surface-mounted temperature compensation crystal oscillator, and the preparation method comprises the steps: obtaining the specification parameter information and processing parameter information of an original wafer; determining the area of an electrode, forming an electrode on the wafer, packaging the electrode to obtain an original crystal, and testing the original crystal to obtain a test result; the original crystals with different test results are selected for manufacturing crystal oscillators, the manufactured crystal oscillators are compensated and verified, and the crystal oscillator temperature precision under the original crystals in different states is obtained; enabling the crystal oscillator temperature precision to correspond to the crystal temperature curve, determining an optimal crystal curve, and obtaining an updated crystal according to the specification parameter information of the updated original wafer; and testing and updating the crystal until the preset precision is reached so as to obtain the optimal specification parameter of the crystal. And the optimal crystal specification parameters can be determined by corresponding to the crystal temperature curve, so that the limitation of precision can be broken through, and the high-precision requirement can be met.