Li Bishan和Tsatsomeros定义了双对角占优矩阵,并且给出了不可约双对角占优矩阵是奇异的及不是H-阵的充分必要条件。本文利用矩阵的有向图的方法研究了α-双对角占优矩阵的性质,并给出了A为奇异的及A不是H-阵的充分必要条件,推广了其主...Li Bishan和Tsatsomeros定义了双对角占优矩阵,并且给出了不可约双对角占优矩阵是奇异的及不是H-阵的充分必要条件。本文利用矩阵的有向图的方法研究了α-双对角占优矩阵的性质,并给出了A为奇异的及A不是H-阵的充分必要条件,推广了其主要结果。展开更多
A transformer type iron core snubber, as a protective device against the stray capacitance during the breakdown in EAST, is analyzed in detail. Three kinds of topology are presented. Then with the analysis for equival...A transformer type iron core snubber, as a protective device against the stray capacitance during the breakdown in EAST, is analyzed in detail. Three kinds of topology are presented. Then with the analysis for equivalent circuit, the ranges of three key parameters, i.e., secondary side resistance, leakage inductance and snubber inductance, are determined. By con- sidering the saturation of the magnetic material, a design principle is Mso presented. A nearly 1：10 core snubber is tested. It is proved that a high permeability core with secondary resistor can restrain the discharge current effectively.展开更多
A high performance sample-and-hold(S/H) circuit used in a pipelined analog-to-digital converter(ADC) is presented in this paper. Fully-differential capacitor flip-around architecture was used in this S/H circuit.A gai...A high performance sample-and-hold(S/H) circuit used in a pipelined analog-to-digital converter(ADC) is presented in this paper. Fully-differential capacitor flip-around architecture was used in this S/H circuit.A gain-boosted folded cascode operational transconductance amplifier(OTA) with a DC gain of 90 dB and a GBW of 738 MHz was designed. A low supply voltage bootstrapped switch was used to improve the linearity of the S/H circuit. With these techniques, the designed S/H circuit can reach 94 dB SFDR for a 48.9 MHz input frequency with 100 MS/s sampling rate. Measurement results of a 14-bit 100-MS/s pipeline ADC with designed S/H circuit are presented.展开更多
基金supported in part by Auxiliary Heating Project of EAST upgradein part by Ph. D foundation of State Education Ministry of China(No. 20060248012)
文摘A transformer type iron core snubber, as a protective device against the stray capacitance during the breakdown in EAST, is analyzed in detail. Three kinds of topology are presented. Then with the analysis for equivalent circuit, the ranges of three key parameters, i.e., secondary side resistance, leakage inductance and snubber inductance, are determined. By con- sidering the saturation of the magnetic material, a design principle is Mso presented. A nearly 1：10 core snubber is tested. It is proved that a high permeability core with secondary resistor can restrain the discharge current effectively.
文摘A high performance sample-and-hold(S/H) circuit used in a pipelined analog-to-digital converter(ADC) is presented in this paper. Fully-differential capacitor flip-around architecture was used in this S/H circuit.A gain-boosted folded cascode operational transconductance amplifier(OTA) with a DC gain of 90 dB and a GBW of 738 MHz was designed. A low supply voltage bootstrapped switch was used to improve the linearity of the S/H circuit. With these techniques, the designed S/H circuit can reach 94 dB SFDR for a 48.9 MHz input frequency with 100 MS/s sampling rate. Measurement results of a 14-bit 100-MS/s pipeline ADC with designed S/H circuit are presented.
