52results about How to "Eliminate offset effects" patented technology

A CMOS device fabricated in a silicon-on-insulator structure and including circuitry and methods in a first embodiment dynamically shifts the threshold voltage of the CMOS device in a receiver to provide improved noise margin and in a second embodiment dynamically matches the threshold voltages in a differential amplifier to correct for manufacturing offset. To dynamically shift the threshold voltage for noise immunity, the back gate or bulk nodes of the devices is shifted through two similar circuits comprised of npn inverters with clamping devices. The back gate of the n device is biased at 0 volts for the maximum Vth and is biased at +1 threshold for the minimum Vth of the device. Only the back gate of the p device is biased at Vdd for the maximum Vth of the device and is biased at 1 Vth below Vdd for the minimum Vth of the device. The Vth of the n device and the p device should be less than the forward bias of the respective source volt junctions to prevent unwanted bipolar currents. By driving the back gates in opposite direction and in phase with the input to the receiver circuit, the threshold voltage of the receiver is moved away from ground (GND) when the input is at a logical "0" and way from Vdd when the input is at a logical "1" which raises the noise immunity of the receiver and speeds the response of the receiver to a desired signal To dynamically match a differential pair for offset correction, a feedback circuit performs a Fast Fourier Transformer analysis of the output signal to determine the presence of even harmonics. A feedback voltage is generated representative of the even harmonics and applied to the back bias contacts of the CMOS devices to correct the effects of the threshold mismatch in the differential pair.

A self-capacitance touch screen. In some examples, the touch screen comprises a plurality of display pixels, a first display pixel of the plurality of display pixels including a first touch electrode of a plurality of touch electrodes, and a gate line coupled to the first display pixel, wherein the gate line is configured such that a voltage at the gate line substantially follows a voltage at the first touch electrode. In some examples, the gate line is coupled to a resistor, the resistor being configured to decouple the gate line from ground. In some examples, the gate line is coupled to an AC voltage source.

A test signal generating part (3) generates test signals of four points where two pairs of points each consist of two points that are point symmetric about the origin point on an I/Q rectangular coordinate system. An envelope determining part (8) determines the amplitudes of output signals of a quadrature modulator at the generation of the four-point test signals, and outputs signals that are proportional to the respective squares of those amplitudes. A comparing part (9) calculates the average value of the output signals from the envelope determining part (8) for each pair of test signals when that pair of test signals are generated. A control part (10) adjusts the amplitudes and/or phases of the test signals in such a mariner that the average values are equal to each other at the generation of two pairs of test signals, and calculates, based on the adjustment result, an I/Q mismatch amount.

The invention discloses a linear nonlinear correction detection system and method based on a harmonic technology. The system comprises a tunable semiconductor laser, a laser control module, a signal generator, a reference light path, a detection light path, a phase-sensitive detection circuit, a data processor, a display module and the like. Through background noise elimination and zero line offset correction, a standard signal corresponding to the second harmonic is obtained through Hitran database fitting, and then adaptive iterative fitting is performed according to an optimal criterion, sothat the asymmetry of the signal is minimized, and the signal after linear asymmetry correction is obtained. The influence of fluctuation, linear asymmetry and the like of zero line offset noise canbe effectively reduced, and the accuracy of gas measurement is improved.

A heat dissipation fan includes a fan module and a flow guide device. The fan module further includes a motor stator set and a fan rotor. The motor stator set provides an axial core and an annular join part. The fan rotor is rotationally joined to the axial core. The flow guide device provides a plurality of flow guide blades. An annular section is provided on the flow guide blades and the flow guide blades is integrally made with the annular join part or the flow guide blades is integrally made with a frame and the frame being attached to the motor stator set. The annular section can reduce an eddy flow area, which is formed due to an electronic component impeding the air flow and creating counter air flow under the flow guide blades, so as to increase flow speed and flow rate of the air flow blown by the fan rotor and approaching an electronic component.

A sensor device comprising a magnetic material having nonlinear magnetic properties within an ambient magnetic flux. The device includes a signal conductor carrying a compound applied electric signal having two frequencies f1 and f2 and coupled to the magnetic material with the ambient magnetic flux to produce a resulting signal. A primary conductor carries a primary current coupled to the magnetic material having nonlinear magnetic properties to change the magnetic flux of the magnetic material and produce the resulting signal. The magnetic material may be open ended or in the shape of a toroid. In the latter case, the device further includes a primary conductor for carrying a primary current coupled to the magnetic material having nonlinear magnetic properties to change the magnetic flux of the magnetic material and produce the resulting signal. The primary and signal conductors are preferably configured as windings on the toroid. When the applied compound electrical signal having two frequencies is a voltage signal the resulting signal is current and when the signal is a current signal, the resulting signal is a voltage. An electrical circuit is used for detecting the resulting signal at frequencies f1=f2 or f1−f2 using a demodulation of the signal to thereby create a low frequency signal f3 related to the ambient magnetic flux magnitude and phase or polarity.

The invention discloses an object pose measurement method and device and a storage medium, the method comprises an offline modeling stage and an online matching stage, and the offline modeling stage is to perform feature modeling on an object three-dimensional model and store the feature modeling for subsequent scene object pose measurement; in the online matching stage, object pose measurement iscarried out on a given scene RGB-D image. Ihe invention provides an efficient model sampling strategy, which can reduce the subsequent operation amount; enough object surface change information can be reserved; the distance range when the point pair characteristics are calculated is limited, and the matching interference of excessive background point clouds is reduced; a quantitative expansion method is provided, and the influence of noise on point-to-feature calculation offset is reduced; edge information is extracted from a color image, candidate object poses are screened, ICP registrationis carried out, the measurement precision is improved, and therefore the scene recognition rate under the conditions of shielding, gathering, stacking and the like is more accurate. The method is widely applied to the field of three-dimensional computer vision.

The invention discloses a forging device for casting forming and a using method thereof, and particularly relates to the technical field of casting machining. The forging device comprises a device box, an adjusting concave frame is mounted on one side of the device box, and an overturning and removing mechanism is arranged in the adjusting concave frame; and the overturning and removing mechanism comprises a two-way linkage lead screw arranged in the adjusting concave frame, and a first servo motor for driving is installed at one end of the two-way linkage lead screw. According to the forging device, the overturning and removing mechanism is adopted, an adjusting motor drives a rotating rod to clockwise rotate by 90 degrees every time face changing is conducted, the rotating rod can continue to rotate by 90 degrees in the same direction every time, forging operation is conducted on different faces of a forge piece, the forged faces are more uniform, and the forge piece can move to the highest point after forging is completed; and under the action of the two-way linkage lead screw, the forged piece can automatically move to a designated position, so that manual taking-out is avoided, operation is more convenient, the accidental safety problem is avoided, more time and labor are saved, and the safety is higher.

The invention provides a base for fixing an arrayed waveguide grating (AWG) chip. The base comprises a base body and a compensation adjustment screw. The base body comprises a first sub-base with a convex portion and a second sub-base with a concave portion. The convex portion matches the concave portion and is disposed in the concave portion. The first side portion of the second sub-base is provided with a chip channel and a protrusion protruding from the first side portion. The convex portion includes a first support plate and a second support plate arranged in a V shape. The first support plate is provided with a first groove at a side adjacent to the concave portion. The second support plate is provided with a second groove at a side adjacent to the concave portion. The compensation adjustment screw is arranged between one end portion of the second support plate and the protrusion. By cutting the base and configuring the compensation adjusting screw, when the AWG chip on the base changes by being affected by temperature, the thermal expansion and contraction of the compensation adjusting screw moves a planar waveguide so as to compensate for the influence of the temperature change on the center wavelength of the AWG.

The invention discloses a deviation prevention agricultural ploughing cultivating device. The deviation prevention agricultural ploughing cultivating device comprises a main rod and a ploughing mechanism, a deviation prevention connecting mechanism and a deviation prevention limiting mechanism are fixed to the main rod, and the deviation prevention connecting mechanism comprises a mounting cover,a deviation spring and a connecting block; the deviation prevention limiting mechanism comprises a movable cover, a movable frame and a supporting column, the ploughing mechanism comprises a fixed block, an electric push rod, a lifting plate and a main rotary tillage cutter, and the lifting plate is further provided with a counterweight mechanism. Through the arrangement of the cooperation of thedeviation prevention connecting mechanism and the deviation limiting mechanism, it can be effectively guaranteed that the rotary tillage cutter cannot deviate, so that furrows generated after ploughing are kept in the same straight line all the time; meanwhile, through the arrangement of the counterweight mechanism, the rotary tillage cutter does not need to be trod by people any more, the rotarytillage cutter is prevented from moving to the surface of land in the ploughing process so that the rotary tillage cutter can better plough land, and the deviation prevention agricultural ploughing cultivating device is very worthy of popularization.

The invention relates to the technical field of domestic window glass, and discloses an external protection manual cleaning device for domestic window glass. The device comprises a wall body, the inner wall of the wall body is connected with a window frame through a bolt, and the inner wall of the window frame is movably connected with a window glass body, a fixed rotary connecting device is welded to one side of the window frame through a stabilizing mechanism, and a cleaning mechanism is welded to the surface of the fixed rotary connecting device. The cleaning mechanism is provided with a cleaning head through a conduction mechanism. According to the external protection manual cleaning device for domestic window glass, by means of the stabilization mechanism and the cleaning mechanism, the user can fix the cleaning mechanism to the place where cleaning is needed through the stabilization mechanism, so that the user can change and adjust according to the different cleaning positions of the user, and the user can drive the cleaning head to rotate through the conduction mechanism of the cleaning mechanism. Glass of different thicknesses and different positions can be cleaned, and the application range of a cleaning device can be greatly enlarged.

The invention relates to the technical field of pressure pipes, and discloses a perforated aluminum-plastic composite pressure pipe. The perforated aluminum-plastic composite pressure pipe comprises aframe body. The bottom of the frame body is fixedly connected with a support body. The bottom of the support body is fixedly connected to the top of a mounting plate. One side of the support body ismovably connected with a rotary rod. One end of the rotary rod penetrates through the support body and is fixedly connected with the inner wall of a first bevel gear. The first bevel gear is engaged with a second bevel gear. The inner wall of the second bevel gear is fixedly connected with a rotating rod. One end of the rotating rod sequentially penetrates through the support body, the frame bodyand a gear and is fixedly connected with the inner wall of a first bearing. The surface of the first bearing is fixedly connected to the inner wall of the top of the frame body. The gear is engaged with a rack moving plate. The top of the rack moving plate is fixedly connected with a support rod. According to the perforated aluminum-plastic composite pressure pipe, through cooperation of the rotary rod and the rotating rod, a worker can adjust the length of a composite pressure pipe bracket conveniently, and the requirement for support of pressure pipes of different sizes of the worker can bemet.

The embodiment of the invention provides a shooting method and electronic equipment, and the electronic equipment is provided with a first camera and a second camera which are oppositely arranged. Themethod comprises the following steps: under the condition that shooting operation is received, obtaining the movement speed and movement direction of a user through the first camera; determining a rotation speed according to the movement speed; controlling the second camera to perform rotary shooting at the rotation speed along the movement direction. According to the method disclosed in the invention, the problem of poor quality of shot images or videos due to the fact that a shooting scheme in the prior art is susceptible to shaking interference of a machine body during multi-angle framingshooting can be solved.

A method for evaluating the functionality of a ceramic sensor for detecting soot, the sensor including two measurement electrodes exposable to an exhaust and spaced apart from one another, and an electrical resistance heating element. The method includes: activating the resistance heating element to heat up the sensor and to burn soot off the two measurement electrodes; then deactivating the resistance heating element; then waiting for a first predetermined time period and/or waiting until a signal that is received from the sensor and represents the sensor temperature reaches a first predefined value; then measuring a first variable representing the electrical resistance between the measurement electrodes; then evaluating the functionality of the sensor based on the first variable representing the electrical resistance between the measurement electrodes.

The invention discloses a concrete pouring device for highway construction, and relates to the technical field of highway construction. The device further comprises a knocking mechanism. Knocking mechanisms are respectively mounted on the bottom plate and the top plate; the knocking mechanism comprises a guide bracket, a crankshaft, a connecting rod, a push rod, a knocking head and a belt pulley; the lower end of each push rod is fixedly connected with a pressure spring; mounting blocks are fixedly connected to the lower ends of the pressure springs; a knocking head is mounted at the lower part of each mounting block; when any one or more knocking heads of the knocking mechanism on the top plate are in contact with the upper end of the template, the knocking heads of the knocking mechanism on the bottom plate are in contact with the rear end face of the template, wherein the positions of the knocking heads are corresponding and the number of the knocking heads is the same. The device has the beneficial effects that bubble discharge in concrete near the formwork can be effectively improved, and the concrete pouring quality is improved.

The invention discloses a wood cutting machine with an anti-deviation device. The wood cutting machine comprises a cutting machine body, a protective cover is fixedly installed on the upper surface of the cutting machine body, and an electric control box is fixedly installed on the portion, located in front of the protective cover, of the upper surface of the cutting machine body. The invention discloses the wood cutting machine with the anti-deviation device, belongs to the field of cutting machines, and aims to enhance the fixing effect on wood, reduce the influence of deviation of the wood due to shock during cutting, buffer impact force, and reduce the risk that the surface of a bevel box body is impacted to sink; and the elastic effect of an elastic net bag can further buffer the impact force generated when the cut-off wood falls on the ground, the situations that the cut-off wood directly falls on the ground and rolls to bring inconvenience to collection, and the high impact force of the wood can cause certain damage to the ground are prevented, the height of a mounting frame can be adjusted according to application scenes and requirements, and the adaptability is better.

A fan device for decreasing eddy flow area includes a fan module and a ring unit. The fan module has a fan rotor and a motor stator set and the fan rotor is movably connected to the motor stator set. The motor stator set has a guide flow device, which provides a plurality of guide flow blades. The ring unit provides a plurality of locating slots corresponding to the guide flow blades so as to be inserted with the guide flow blades easily. The ring unit can reduce the eddy flow area formed by way of counter flow reflected from an electronic component under the guide flow device to increase flow rate and speed of the air flow. The ring unit is independently attached to the guide flow device so that it is easy to be mounted to the guide flow device and capable of lowering the production cost.

The invention relates to a preparation method of an SOI-based concave gate enhanced GaN power switch device. The preparation method comprises the following steps of passivating for the first time; forming the ohmic contact in the source and drain regions; carrying out ion implantation; etching a concave gate region; growing a gate dielectric layer and a gate metal; passivating for the second time;opening a source-drain window; performing deep groove etching for the first time; performing deep groove etching for the second time. The advantages of simpler process and small gate leakage currentbrought by a concave gate structure prepared by the method and the device monolithic isolation advantage brought by an SOI material lay a solid foundation for realizing a GaN monolithic integrated half-bridge circuit, and a new direction for the development of GaN power devices is provided.