1050 results about "Dead band" patented technology

A method for fabricating a back-illuminated semiconductor imaging device on a semiconductor-on-insulator substrate, and resulting imaging device is disclosed. The device includes an insulator layer; a semiconductor substrate, having an interface with the insulator layer; an epitaxial layer grown on the semiconductor substrate by epitaxial growth; and one or more imaging components in the epitaxial layer in proximity to a face of the epitaxial layer, the face being opposite the interface of the semiconductor substrate and the insulator layer, the imaging components comprising junctions within the epitaxial layer; wherein the semiconductor substrate and the epitaxial layer exhibit a net doping concentration having a maximum value at a predetermined distance from the interface of the insulating layer and the semiconductor substrate and which decreases monotonically on both sides of the profile from the maximum value within a portion of the semiconductor substrate and the epitaxial layer. The doping profile between the interface with the insulation layer and the peak of the doping profile functions as a “dead band” to prevent dark current carriers from penetrating to the front side of the device.

A system for measuring a metabolic parameter. The system includes an integrated airway adapter capable of monitoring any combination of respiratory flow, O₂ concentration, and concentrations of one or more of CO₂, N₂O, and an anesthetic agent in real time, breath by breath. Respiratory flow may be monitored with differential pressure flow meters under diverse inlet conditions through improved sensor configurations which minimize phase lag and dead space within the airway. Molecular oxygen concentration may be monitored by way of luminescence quenching techniques. Infrared absorption techniques may be used to monitor one or more of CO₂, N₂O, and anesthetic agents.

A pulse-width modulation (PWM) amplifier is adapted to a class-D amplifier in which an analog input signal is subjected to integration, pulse-width modulation, and switched amplification, wherein a glitch elimination circuit eliminates noise from a pulse-width modulated signal, from which a high pulse signal and a low pulse signal are isolated such that each pulse is delayed by a dead time at the leading-edge timing thereof. When both of them are simultaneously set to a high level, one of them is reduced in level. In response to the occurrence of clipping, an integration constant applied to an operational amplifier is automatically changed from a primary integration constant to a secondary integration constant. When the clipped state is sustained for a prescribed time, an inversion pulse is compulsorily introduced into the pulse-width modulated signal.

A power converter employing a controller configured to increase a dead time between conduction periods of first and second power switches therein and method of operating the same. In one embodiment, the power converter includes first and second power switches coupled to an input thereof, and a sensor configured to provide a sensed signal representative of at least one of a current level and a power level of the power converter. The power converter also includes a controller configured to increase a dead time between conduction periods of the first and second power switches when the sensed signal indicates a decrease of at least one of the current level and the power level of the power converter.

Quality settings established by an encoder are adjusted based on information associated with regions of interest (“ROIs”). For example, quantization step sizes can be reduced (to improve quality) or increased (to reduce bit rate). ROIs can be identified and quality settings can be adjusted based on input received from a user interface. An overlap setting can be determined for a portion of a picture that corresponds to an ROI overlap area. For example, an overlap setting is chosen from step sizes corresponding to a first overlapping ROI and a second overlapping ROI, or from relative reductions in step size corresponding to the first ROI and the second ROI. ROIs can be parameterized by information (e.g., using data structures) that indicates spatial dimensions of the ROIs and quality adjustment information (e.g., dead zone information, step size information, and quantization mode information).

An air gap retractor illumination system includes any suitable retractor such as a McCulloch with a channel in the blade to accommodate an air gap illuminator. The illuminator is preferably made from a suitable light conducting plastic material such as acrylic or polycarbonate or silicone. The illuminator has active portions in which light passes and inactive or dead zones in which light does not pass as a result of the configuration and orientation of the input, output and surfaces of the illuminator. The illuminator is formed to have an air gap surrounding any active portion of the illuminator extending from the light input to the light output portion. The dead zones may include elements to allow the illuminator to securely engage the retractor. The light output portion of the illuminator contains from two to eight output zones, each zone having specially designed output optical structures that control and direct light to escape the illuminator to shine onto a predetermined area of interest or to form one or more predetermined shapes or footprints.

The invention discloses an interference suppression method of a hybrid network of macrocell and Femtocell. The method comprises the following steps: the Femtocell in a certain range is clustered; the transmission power of the femto base station in the cluster; the clustering situation of the Femtocell is adjusted; the Femtocell in an interference sensitive area is clustered; for the Femtocell of the clustered interference sensitive area, the transmission power of the femto base station in the cluster is controlled by using the cluster as unit; the clustering situation of the Femtocell in the interference sensitive area is adjusted, the Femtocell cluster in the interference sensitive area is determined; the micro user equipment is divided into a dead zone user equipment and a non-dead zoneuser equipment; spectrum resources are divided into three nonoverlapping parts; and the spectrum resources are distributed for the Femtocell in the interference sensitive area, the dead zone user equipment, the Femtocell in the non-interference sensitive area and the non-dead zone user equipment. By adopting the method of the invention, the spectrum utilization efficiency and system capacity of the overlapped double-layer network of the macrocell and the Femtocell, and the problems of the cross-layer interference between the macrocell and the Femtocell and the same-layer interference of the Femtocell can be effectively solved.

An articulated robot capable of reducing dead space while maintaining a wide operating area and simplifying a power transmission system necessary for moving each joint. A plurality of joint arms A1 to A7 are connected via first rotating shafts 15, 15A, and 15B as horizontal rotating shafts and via second rotating shafts 32, 32A, and 32B as inclined rotating shafts alternately. A motor M for driving the rotating shaft and a speed-reducing mechanism are provided for each rotating shaft.

Method for setup of parameter values in a RF power amplifier circuit arrangement (200), wherein the amplifier circuit arrangement (200) comprises a first (210) and a second (220) amplification branch and is operated in an out-phasing configuration for amplification of RF input signals with modulated amplitude and modulated phase and respective circuit arrangements are disclosed. According to a first aspect a re-optimization of the dead-time or conversely the duty-cycle, respectively, the phase of the output signal after the combiner can be kept linear with respect to the out-phasing angle. Further, according to a second aspect, additionally to introduction of an optimally chosen dead-time, a non-coherent combiner (Lx, Lx*) can reduce crowbar current and switching losses due the output capacitance (Cds). Furthermore, according to a third aspect the reactive compensation can, additionally or alternatively, be controlled by operating both amplification branches at different duty-cycles.

A programmable spatial filter for use as a Fourier plane filter in dark field wafer inspection systems, based on the use of MEMS (Micro-Electro-Mechanical Systems) devices. In comparison with prior art systems, especially those using LCD's, the use of MEMS devices provide a number of potential advantages, including good transmission in the UV, a high fill factor, polarization independence and a high extinction ratio since the shutter is opaque when closed. The MEMS devices can be flap devices, artificial eyelid, or double shutter devices. Additionally, a novel spatial light modulator (SLM) assembly having a double layer of SLM arrays is described, in which the fill factor is increased in comparison to a single layer SLM using the same devices, by positioning the dead areas of the elements of both arrays collinearly in the modulated beam. This SLM assembly can be implemented using pixelated LCD arrays or MEMS arrays.

The invention relates to a method for recognizing parameters of asynchronous motor. The stator resistance of motor is measured by a method of DC volt-ampere. The rotor resistances as well as leakage inductance of stator and rotor of motor is obtained by short circuit test. Mutual inductance of stator and rotor of motor can be taken from method of no-load test. Compensating voltage drop in on state, switch time delay and dead time raises the accuracy and stability of recognized parameter. The resistance values of rotor at frequency of rating sliding difference are calculated by method of two points through test of locked rotor at two frequencies. Since skin effect is overcome, the resistance values of rotor are accurate enough so as to meet the requirement of vector control system completely.

Systems and methods for automatically adjusting the alignment of high-side and low-side pulse width modulated signals to improve dead time and shoot-through conditions. In one embodiment, a system includes a digital amplifier controller, an amplifier output stage coupled to the controller and configured to receive audio signals from the controller, and one or more sensors coupled to the output stage. The sensors are configured to detect and/or measure various parameters, such as shoot-through current and distortion, which are associated with the operation of the output stage. The sensors provide feedback to an internal processor or modulator of the controller, which then adjusts the timing of the high-side and low-side signals to improve the operating conditions of the output stage by minimizing shoot-through current and/or distortion.

A local positioning system uses at least one node to track a location of a mobile tag. The system measures flight times of signals communicated between the node and the tag to determine values indicative of the range of the tag from the node. If desired, the values may be filtered in an effort to increase the accuracy of the range estimation. As an example, a Kalman filtering algorithm may be used. Multiple antennas are used at both the node and the tag to provide more accurate range estimates and to determine when the tag is entering a dead zone where signals are blocked or attenuated by obstacles.

An apparatus for receiving an asynchronous data signal may include a clock generator that generates a clock signal having a frequency approximately equal to the bit rate of the asynchronous data signal. An edge detector may detect transitions of the asynchronous data signal. A dead-band detector may detect when a transition of the clock signal used to sample the data signal occurs within a predetermined amount of time of a transition of the asynchronous data signal so that data sampled on that transition of the clock signal may be invalid. The phase of the clock signal may be adjusted if the transition of the clock signal occurs within this predetermined amount of time. The clock generator may include two programmable counters, one which may be programmed with a bit-rate value so that it generates a signal approximately matching the bit rate of the asynchronous data signal, and the other programmed with a phase-delay value so that it generates a sample clock signal at a phase delay from the signal generated by the first counter. The phase of the sample clock may be adjusted by restarting the counters in response to a transition on the asynchronous data signal. Data may be supplied to a serial-to-parallel converter including a first shift register configured to shift a data word in serially and output the data word in parallel and a second shift register configured to track when the data word had been completely shifted into the first shift register.

A novel and useful variable delay digitally controlled crystal oscillator (DCXO) buffer (i.e. slicer). A conventional slicer following the DCXO is modified to introduce a controlled random variable delay into the buffered DCXO clock. The resultant output clock signal is then used as input to the TDC of an ADPLL circuit to alleviate the subharmonic mixing based deterioration caused by LO/TX coupling through the crystal pins, and to alleviate the dead-beat effects caused by the finite resolution of the TDC. Two mechanisms for introducing variable delay into the buffered DCXO output clock signal are presented: a first mechanism that creates variable delay in fine steps and a second mechanism that creates variable delay in coarse steps. In both mechanisms, switches are incorporated into the slicer circuitry and controlled using digital bit sequences which may comprise dithering signals. The switches are turned on and off via the digital bit sequences which varies the delay of the slicer clock output which serves to shift the rising and falling transition points of the resultant output clock signal. The jitter is shifted to higher frequencies where it is filtered out by the PLL loop filter.

A technique for reconstructing phase currents based on measurements of a DC bus current. Non-observable regions of DC bus current samples to reconstruct phase currents are reduced in size by using two phase space vector modulation. The non-observable regions can be further reduced by omitting deadtime insertions for switch actuations when output current is higher than a given threshold. Voltage command vectors in non-observable areas can be constructed by two time averaged vectors one of which is constructed to obtain an observable DC bus current reflecting motor phase current. The additive vectors have the same combined time average value as that of the voltage command vector in order to preserve volt-seconds. Current samples may also be averaged to provide a more accurate reconstruction of phase current. Current samples are time delayed to avoid transients for more accurate readings. When three phase PWM inverter modulation results in inability to determine the motor phase current from the DC bus measurement, the technique includes dynamically switching to two phase PWM modulation to reduce the time interval when the motor phase current is not determinable through the DC bus current measurement.

Apparatus for minimizing power losses associated with dead time between ON times of two series connected switches of a power converter connected across a supply potential, the apparatus comprising a control arrangement for monitoring a selected parameter associated with power loss during the dead time of the converter; the control arrangement changing the dead time from a first dead time to a second dead time and comparing power loss associated with the selected parameter for the first and second dead times and determining which of the power losses associated with the two dead times is smaller; a dead time implementing stage for implementing the two dead times; and the control arrangement selecting the dead time associated with the smaller power loss and providing a signal to the dead time implementing stage to set the selected dead time.

The invention discloses an optimizing control and capacity planning system and method for involving an energy storage device into machine set frequency modulation. The method comprises the steps that after being connected with a power conversion device and a wave filtering device in sequence, an energy storage unit gets access to a regional power grid, and a logic judgment device is connected with a device for sending an AGC instruction of a dispatching center of the grid, an outlet of a traditional machine set and the power conversion device; the AGC instruction of the dispatching center of the grid is transmitted to the energy storage device and the traditional machine set simultaneously, and the logic judgment device collects the AGC instruction, the outlet power of a power generator and battery electrical charge state information of the energy storage device and judges the outlet power of the energy storage unit at each moment. The optimizing control and capacity planning system and method for involving the energy storage device into the machine set frequency modulation have the advantages that the energy storage device in introduced into the power generation side, the frequency modulation effect can be improved, and the problems that in a traditional frequency modulation mode, the response speed is low, the modulation precision is low, and machine set 'back-modulation' and dead zone vibration exist, can be effective inhibited.

When it is determined that the torque output from the electric motor abnormally fluctuates or the torque output from the electric motor varies between clockwise and counterclockwise turning operations of the driver's steering wheel, the steering assist control is continued if the vehicle speed v is equal to or lower than the reference speed v0. In this case, the width of the dead band of the steering torque in the assist map used to calculate the target assist torque is increased. Thus, only in a case where the vehicle is moving at a low speed and the driver's steering wheel is operated with a great force, the steering assist torque is produced to alleviate the burden on the driver. In the other cases, the electric motor is stopped to minimize a sense of discomfort in the steering operation.