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123results about How to "Small area" patented technology

Omnidirectional vectored thrust cycloidal propeller

The invention discloses an omnidirectional vectored thrust cycloidal propeller, which comprises a propeller, a cycloidal oar and a cycloidal oar eccentric circle positioning mechanism, wherein the cycloidal oar comprises cycloidal oar blades in the same number as propeller blades, control pull rods, an operating rock arm and a cycloidal oar blade spherical hinge; each cycloidal oar blade is hinged with a propeller blade at rear grazing point of the front edge of the propeller blade; the airfoil surface of each cycloidal oar blade is vertical to that of a propeller blade; an eccentric circular ring of the cycloidal oar eccentric circle positioning mechanism is sleeved on a propeller shaft; the connecting rod of the spherical head of each spherical hinge is connected with the eccentric circular ring respectively; each control pull rod is connected with a cycloidal oar blade; the operating rock arm is positioned in a spanwise symmetrical surface of the cycloidal oar blades; the cycloidal oar blade spherical hinge at one end of the operating rock arm is connected with one end of the control pull rods; and the other end of the operating rock arm is fixedly connected to a cycloidal oar blade tubular beam. The omnidirectional vectored thrust cycloidal propeller of the invention combines the advantages of the cycloidal oar and the conventional propeller and has an omnidirectional vectored thrust while improving aerodynamic efficiency of the conventional propeller.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Linear frequency-modulated signal generator with predistortion function

ActiveCN104267385AWith pre-distortion functionCompensate for nonlinear effectsWave based measurement systemsAngle demodulation by oscillations conversionSignal generatorPredistortion
The invention provides a linear frequency-modulated signal generator with a predistortion function. The linear frequency-modulated signal generator comprises an FPGA unit, a digital-analog conversion unit and a filtering unit, wherein the FPGA unit is used for generating a phase position predistortion digital linear frequency-modulated signal and conducting amplitude predistortion processing on the phase position predistortion digital linear frequency-modulated signal to generate two orthogonal amplitude-phase predistortion digital linear frequency-modulated signals; the digital-analog conversion unit is connected with the output end of the FPGA unit and used for converting the two orthogonal digital linear frequency-modulated signals subjected to amplitude-phase predistortion into two orthogonal discrete analog linear frequency-modulated signals; the filtering unit is connected with the digital-analog conversion unit and used for filtering out frequency components beyond a preset frequency range of the two orthogonal discrete analog linear frequency-modulated signals to obtain two continuous orthogonal analog linear frequency-modulated signals. The linear frequency-modulated signal generator can compensate for non-linear influences of an analog circuit on the linear frequency-modulated signals by means of amplitude-phase predistortion processing, and guarantee that the high-quality linear frequency-modulated signals can be obtained finally.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI

Testing device of 3D-SIC (Three-Dimensional-Semiconductor Integrated Circuit) through silicon vias provided with signal rebounding module

The invention discloses a testing device of a 3D-SIC (Three-Dimensional-Semiconductor Integrated Circuit) through silicon vias provided with a signal rebounding module. A sending end is connected with a receiving end by through a plurality of silicon vias TSVs. The sending end comprises a first tested chip, a decoder, a control unit CU, a latch D and a bidirectional switch DSW. The receiving end comprises a second tested chip and a signal rebounding module. The signal rebounding module comprises a signal generator F, a plurality of delay cells and a plurality of three-state gates. The upper ends of the TSVs are connected with the delay cells M and the signal generator F at the receiving end. The lower ends of the TSVs are connected with the decoder and the DSW at the sending end. The decoder, the latch D and the DSW are connected with the CU. The latch D is further connected with the DSW. The testing device of the 3D-SIC through silicon vias provided with the signal rebounding module can effectively solve the problem that failed TSVs in the 3D chip preparing process are hard to detect effectively, and has the advantages of smaller area and practical expenses and lower power consumption and the like.
Owner:HEFEI UNIV OF TECH

A switch bootstrap charging circuit suitable for high-speed gate driving of GaN power device

A switch bootstrap charging circuit suitable for high-speed gate driving of a GaN power device belongs to the technical field of power management. A control logic module generates a first control signal and a second control signal according to the undervoltage signal and the low-side gate driving signal. The gate electrode of the first PMOS transistor is connected to the second control signal, thesource electrode thereof is connected to the supply voltage, and the drain electrode thereof is connected to the source electrode of the first NMOS transistor. An input end of the first inverter is connected with a first control signal, an output end of the first inverter is connected with an input end of the second inverter and is connected with a cathode of the first diode and a gate electrodeof the second NMOS transistor through a first capacitor; The anode of the first diode and the source of the second NMOS transistor are connected to a supply voltage; The gate electrode of the first NMOS transistor is connected to the drain electrode of the second NMOS transistor and is connected to the output end of the second inverter through the second capacitor, and the drain electrode of the second NMOS transistor serves as the output end of the switch bootstrap charging circuit. The invention can prevent the voltage on the bootstrap capacitor from being too large when charging, can realize on-chip integration, and has a simple circuit structure and high reliability. It is especially suitable for GaN high-speed gate drive.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
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