7results about How to "Strong coupling ability" patented technology

The invention relates to a gallium nitride transistor based on a polycrystalline silicon field plate and a preparation method thereof, and belongs to the technical field of semiconductor devices. The transistor comprises a substrate, a GaN buffer layer, a GaN channel layer, an AlN insertion layer and an AlGaN barrier layer which are sequentially arranged from bottom to top, a P-GaN cap layer and a first passivation layer are arranged on the upper side of the AlGaN barrier layer, a gate metal field plate is arranged on the upper side of the P-GaN cap layer, a second passivation layer is arranged on the upper sides of the gate metal field plate and the first passivation layer, and the second passivation layer is arranged on the upper side of the second passivation layer. Two sides of the GaN buffer layer are respectively provided with source electrode metal and drain electrode metal, the first passivation layer and the second passivation layer are provided with grooves, the bottoms of the grooves penetrate through the AlGaN barrier layer, and polycrystalline silicon field plates are arranged on the upper side of the source electrode metal, the upper side of the second passivation layer and in the grooves. By introducing the polycrystalline silicon field plate, interface charges are inhibited, and the electrical performance of the device is remarkably improved.

The invention discloses an underwater robot motion control method based on fuzzy active disturbance rejection control. As the basis of underwater robot motion control research, firstly, a kinetic model is established for an underwater robot; and then an active disturbance rejection controller is used as a basic controller. In order to avoid the problems of phase lag and long adjustment time caused by a tracking differentiator, the linear active disturbance rejection controller designed by the invention does not use the tracking differentiator (TD), and only keeps a linear extended state observer (LESO) and a linear state error feedback rate (LSEF). Finally, in order to adapt to the problem that the underwater robot faces control model change when executing different operation tasks, a fuzzy controller is added on the basis of the improved linear active-disturbance-rejection controller, parameters in the linear active-disturbance-rejection controller are dynamically adjusted through a fuzzy inference rule, and therefore the control model change is avoided. Therefore, optimal control parameters can be adjusted for robot motion control under different conditions.

The embodiment of the present invention discloses a broadband orthogonal coupler, comprising a first coupling line, a second coupling line parallel to the first coupling line, one end of the first coupling line being an input port and the other end being an output port, one end of the second coupling line being a coupling port and the other end being a transmission port, the broadband orthogonal coupler further comprising two phase shifting circuits, one phase shifting circuit being connected in parallel to both ends of the first coupling line, the other phase shifting circuit being connected in parallel to both ends of the second coupling line, and the phase shifting circuit comprising circuit components capable of storing and releasing electromagnetic energy. By utilizing the first coupling line and the second coupling line, parallel coupling lines can be formed, and the parallel coupling lines can effectively eliminate the limitations of standard semiconductor processes, and the broadband orthogonal coupler is formed by using two phase shifting circuits symmetrically arranged at the ports of the parallel coupling lines, so that the broadband orthogonal coupler has the advantages of small area, wide bandwidth, strong coupling capability and good flatness.

A spin-orbit moment magnetic random access memory (MORAM) and method for controlling an artificial antiferromagnetic free layer with ferroelectric metal are disclosed. The MORAM comprises multiple memory cells, with the free magnetic layer being an artificial antiferromagnetic structure comprising a first magnetic layer, a non-magnetically coupled layer formed on the first magnetic layer, and a second magnetic layer formed on the non-magnetically coupled layer. The ferroelectric metal layer simultaneously possesses ferroelectric polarization characteristics and a spin-orbit coupling effect, generating a spin-orbit moment when an in-plane current is applied to drive the magnetic moment reversal of the free magnetic layer. Simultaneously, the magnetic coupling state of the artificial antiferromagnetic structure is controlled by the ferroelectric polarization electric field. The simultaneous presence of ferroelectric polarization and spin-orbit coupling characteristics in the ferroelectric metal layer enables both ferroelectric control and spin-orbit moment writing functions, thereby simplifying the device structure, reducing the write current density required for magnetic moment reversal, and lowering device power consumption.

A kind of Mollier chart-based temperature and humidity equivalent relationship construction method, comprising the following steps: collecting the environmental data of target area, correcting the air temperature and relative humidity on metal surface state, obtaining the metal surface temperature and metal surface relative humidity corresponding to metal corrosion interface, using metal surface temperature and metal surface relative humidity as Mollier chart calculation input, establishing target area Mollier chart enthalpy database, point-by-point judging rainfall information, condensation information and metal surface relative humidity corresponding to multiple sampling times, then respectively accumulating statistics on the wet air enthalpy in multiple state sets, obtaining total annual enthalpy, and determining effective corrosion enthalpy, using pollutant acceleration coefficient to correct, determining the temperature and humidity equivalent relationship between natural environment and indoor equivalent environment, with the advantages of clear equivalent basis, strong regional adaptability, quantifiable test parameters, high corrosion correlation and compressible evaluation period.

The invention provides an on-chip high-density capacitor which comprises a substrate and two metal oxide variable capacitors formed on the substrate, a grid electrode GATE of a first metal oxide variable capacitor Q1 is connected with a top plate PLUS, and a grid electrode GATE of a second metal oxide variable capacitor Q2 is connected with a bottom plate MINUS; the N well contact end of the Q1 is connected to a base plate MINUS; the grid electrode GATE of the Q2 is connected to the MINUS end, and the N well contact end of the Q2 is connected to the PLUS end; the on-chip high-density capacitor further comprises a metal capacitor CAPMOM. According to the on-chip high-density capacitor, the two metal oxide variable capacitors of the CAPGATE capacitor are reversely connected, so that the CAPGATE capacitor basically does not change along with the change of voltage, the stability is higher, and the coupling capability is stronger. Furthermore, the density of the on-chip high-density capacitor is improved by superposing the CAPMOM capacitor.

The present invention proposes a simulation method for a tracked vehicle on-board servo system considering torsion axis constraints. First, based on the RecurDyn simulation platform, a dynamic model of the vehicle body system during movement is established. Then, the dynamic model is used as the control subject, combined with the Matlab\Simulink algorithm module, to establish a tracked vehicle servo system model. Finally, a joint simulation is performed based on the established RecurDyn model and the Simulink tracked vehicle on-board servo system. The multi-body system dynamics model and the input and output interfaces of the tracked vehicle on-board servo system are jointly simulated, and a joint simulation model of the mechatronics of the tracked vehicle is established by combining the dynamic model and the tracked vehicle on-board servo system. This joint simulation model can provide a more realistic tracked vehicle operation condition. The controller designed based on this is more practical and has a wide range of usage scenarios.