Topic
Rise time
About: Rise time is a research topic. Over the lifetime, 4748 publications have been published within this topic receiving 47512 citations.
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TL;DR: In this article, the effect of the driving pulse repetition frequency (PRF) on the SAS output is studied with respect to its driving conditions, utilizing three DSRDs to produce pulses with various rise times from 0.5 to 5 ns.
Abstract: Silicon-avalanche-shaper (SAS) diodes are fast-closing switches capable of producing high-voltage pulses with a rise time of ~100 ps. The SAS can be driven by a positive, nanosecond scale, high-voltage pulse applied to its cathode where the magnitude of the driving pulse is correlated to the magnitude of the pulse at the SAS anode (output). Drift-step-recovery diodes (DSRDs) are fast-opening switches capable of producing high-voltage pulses with a rise time of the order of 1 ns. Thus, DSRDs are good candidates for driving SAS diodes. In this paper, the SAS output is studied with respect to its driving conditions. First, the SAS output is examined with respect to the magnitude and rise time of the driving pulse, utilizing three DSRDs to produce pulses with various rise times from 0.5 to 5 ns. In addition, the effect of the driving pulse repetition frequency (PRF) on the SAS output is studied. An experimental demonstration using a 1.5-kV SAS fabricated at the Ioffe Physical Technical Institute shows the advantage of driving the SAS with the short, 0.5 ns, pulses, and the degradation of performance due to high PRF, up to 10 MHz.
18 citations
Patent•
19 Nov 2009TL;DR: In this article, a level shifting circuit with reduced shoot-through current includes an output circuit comprising high-voltage devices with a pull up circuit configured for pulling up a voltage on an output signal to a high voltage responsive to a low-side control signal.
Abstract: A level shifting circuit with reduced shoot-through current includes an output circuit comprising high-voltage devices with a pull up circuit configured for pulling up a voltage on an output signal to a high voltage responsive to a high-side control signal. The output circuit may also include a pull down circuit configured for pulling down the voltage on the output signal to a low voltage in responsive to a low-side control signal. The level shifting circuit can also include a high-side inverting buffer operably coupled between an edge-controlled signal and the high-side control signal, and a low-side buffer configured for driving the low-side control signal responsive to an input signal. The level shifting circuit may also include an edge-control buffer operably coupled between the input signal and the high-side inverting buffer and configured to generate the edge-controlled signal with a slow rise time relative to a fall time.
17 citations
TL;DR: In this article, a novel wavelength conversion scheme, differential cross-polarization modulation (DXPoM), using an extra birefringence delay was proposed to enhance the performance of the conventional CPM.
Abstract: This work presents a novel wavelength conversion scheme, differential cross-polarization modulation (DXPoM), using an extra birefringence delay to enhance the performance of the conventional cross-polarization modulation. Simulation and experimental results confirm that the predicted performance is enhanced. Using the proposed scheme improves rise time by over 300%, reduces timing jitter by 50%, and increases extinction ratio by 9%.
17 citations
01 Dec 1968
TL;DR: In this paper, the authors discuss the problem of high voltage ac motors with ratings from a few hundred kW and show that the rise time of these impulse voltages can be as short as 0.2 microsecond.
Abstract: High voltage ac motors with ratings from a few hundred kW may, during normal operation, be subjected to steep-fronted impulse voltages which can be hazardous to the turn-to-turn insulation. The rise time of these impulse voltages can be as short as 0.2 microsecond. These problems were discussed by R. M. Sexton in a recent paper1 where further references can be found.
17 citations
TL;DR: In this paper, the dependence of the measured radiation losses in ETA-BETA II on plasma density and plasma current rise time is discussed, and a high-density limit is found, corresponding to large radiation.
Abstract: The dependence of the measured radiation losses in ETA-BETA II on plasma density and plasma current rise time is discussed. A high-density limit is found, corresponding to large radiation. Above this limit, burning through the light impurities (mainly oxygen) does not take place and a cold, radiation-dominated discharge is obtained. This high-density limit scales with the plasma current, indicating a lower limit on the I/N parameter similar to the tokamak high-density limit. With longer current rise times the radiation energy loss during the set-up phase increases about linearly with rise time, corresponding always to about 50% of the total energy losses during this phase.
17 citations