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Temperature-Dependent Third Cumulant of Tunneling Noise C.W. J. Beenakker, M. Kindermann,
Temperature-Dependent Third Cumulant of Tunneling Noise C.W. J. Beenakker, M. Kindermann,

... [4]. The pictures are strikingly different from what was expected theoretically. The slope varies by an order of magnitude between low and high voltages, and for certain samples even changes sign. Such a behavior is expected for a diffusive conductor [5], but not for a tunnel junction. Although the ...
Test Equipment for AC/DC Drive and Power Electronic Measurement
Test Equipment for AC/DC Drive and Power Electronic Measurement

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CIRCUIT FUNCTION AND BENEFITS

... thermal tracking. The output buffer is again the AD8676, used for its low noise and low drift. This amplifier is also used (A1) to amplify the +5 V reference voltage from the low noise ADR445 to +10 V. R2 and R3 in this gain circuit are precision metal foil resistors with 0.01% tolerance and a tempe ...
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synchronisation-channel selection in power measurements

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MS Word - Sonoma State University

... (b) Next, we now want to compare our result from part (a) with the distributed circuit with the coaxial transmission line. Ignoring any small resistive losses in the transmission line, we assume an ideal transmission line (of course, it does have 96 pF of total line capacitance because it is 3 feet ...
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TPS62110-Q1 17-V 1.5-A Synchronous Step

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Evaluates: MAX8586 MAX8586 Evaluation Kit General Description Features

... and tested surface-mount circuit board demonstrating the MAX8586 1.2A USB switch. The EV kit operates from a 2.7V to 5.5V input power supply and is capable of sourcing up to 1.2A. The MAX8586 features an adjustable current limit and autorestart for overload and short-circuit protection. A 20ms fault ...
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ACNT-H790-000E Datasheet

... (to minimize power dissipation), low inductance (to minimize di/dt induced voltage spikes which could adversely affect operation), and reasonable tolerance (to maintain overall circuit accuracy). Choosing a particular value for the resistor is usually a compromise between minimizing power dissipatio ...
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L44086268

< 1 ... 1980 1981 1982 1983 1984 1985 1986 1987 1988 ... 2646 >

Switched-mode power supply



A switched-mode power supply (switching-mode power supply, switch-mode power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a source, like mains power, to a load, such as a personal computer, while converting voltage and current characteristics. Unlike a linear power supply, the pass transistor of a switching-mode supply continually switches between low-dissipation, full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. Ideally, a switched-mode power supply dissipates no power. Voltage regulation is achieved by varying the ratio of on-to-off time. In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.Switching regulators are used as replacements for linear regulators when higher efficiency, smaller size or lighter weight are required. They are, however, more complicated; their switching currents can cause electrical noise problems if not carefully suppressed, and simple designs may have a poor power factor.
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