A new convergence scheme is designed to achieve a fast speed, low power and highly reliable operation for existing flash EEPROM technology. By applying a substrate bias and lowering the drain voltage, the gate injection is found to move from Drain-Avalanche-HotCarrier (DAHC) injection to Substrate-Current-Induced Hot Electron (SCIHE) injection. Compared to the well-known DAHC convergence scheme-[ 11, the new SCIHE scheme shortens the convergence time over a hundred times, reduces the total drain and substrate currents significantly for block convergence, and makes the device degradation negligible. Bias conditions are optimized for flash cells with medium channel doping of about 3 x 1017 ~m -~, 0.85 pm gate length and 73 A gate tunnel oxide to realize convergence times under 250 ps using this new low power scheme.
This paper specifically describes the design of hardware and software of a digital pulse oximeter based on ARM core embedded system and light-frequency converter. In this study, a light-frequency converter instead of a photodiode was adopted to receive the light transmitting, which greatly simplified the design of hardware. Besides, traditional methods of calculate frequency of rectangle signal were improved and an algorithm with stable sampling rate and high resolution was proposed. Based on the filtering and detecting methods of the pulse signal, the baseline drift and the noise on high frequency were successfully removed by applying integer coefficient filter. A detecting algorithm based on difference and threshold was proposed, and the future points of the signal can be extracted effectively. The result shows that this oximeter can overcome usual noise, the software is very flexible and simple in structure.Keywords-pulse oxygen saturation, ARM core embedded system, light to frequency converter, baseline drift, integer coefficient filter, method of difference and threshold 1)
Abstract. Aiming at the position control problem of permanent magnet synchronous linear motor (PMLSM), the PMLSM Hamiltonian function was built based on Hamiltonian feedback dissipative control strategy in the perspective of energy shaping. First, a speed controller was proposed, then a position control outer loop was added to control closed loop, the PMLSM position control was realized with feedback dissipative method. The simulation results shown that the proposed method can ensure system has fast response, small tracking error and good robust performance, and also simplify system parameter setting.
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