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Modeling Method of Fast Transient for Unsymmetrical Stray
Modeling Method of Fast Transient for Unsymmetrical Stray

... method automatically estimates the unsymmetrical circuit parameters both in the high- and low-frequency regions. The measurement of the small stray capacitance is difficult due to restrictions of the measuring instrument. In addition, the stray capacitance to ground has to be measured in a state of ...
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... provides power conditioning for many of the world’s foremost organizations, ensuring that the continuous operation of small and medium to large businesses are protected on a global scale. ABB’s Power Conditioning portfolio is a unique line up of low and medium voltage power conversion technology tha ...
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... such that MLCC’s can provide a cost effective filter solution for low voltage (< 12 V), high frequency converters (>200 kHz). For example, a 10 mF MLCC 16 V in a 805 SMT package has an ESR of 2 mW and an ESL of 100 nH. Using several MLCC’s in parallel, connected to power and ground planes on a PCB w ...
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BiCMOS PFC/PWM Combination Controller
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... SS2: (soft-start for PWM) SS2 is at ground for either enable low or OVP/ENBL below the UVLO2 threshold conditions. When enabled, SS2 charges an external capacitor with a current source. This voltage is used as the voltage error signal during start-up, enabling the PWM duty cycle to increase slowly. ...
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Designing Switching Voltage Regulators with

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... digital wireless applications. It operates from a +2.7V to +5.5V supply voltage and features four operating modes for advanced system power management. Supply current is reduced to 0.2µA in shutdown mode. In a typical application, the receiver downconverts a high IF/RF (up to 600MHz) to a low IF (up ...
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... reversed. As a result, the diode is reverse biased. Practically no current flows through the circuit and almost no voltage is developed across the resistor. All input voltage appears across the diode itself. Hence we conclude that when the input voltage is going through its positive half cycle, outp ...
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... The IC operates with a cascaded control; the inner current loop and the outer voltage loop. The inner current loop of the IC controls the sinusoidal profile for the average input current. It uses the dependency of the PWM duty cycle on the line input voltage to determine the corresponding input curr ...
DATASHEET SEARCH SITE | WWW.ALLDATASHEET.COM
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Spark-gap transmitter



A spark-gap transmitter is a device that generates radio frequency electromagnetic waves using a spark gap.Spark gap transmitters were the first devices to demonstrate practical radio transmission, and were the standard technology for the first three decades of radio (1887–1916). Later, more efficient transmitters were developed based on rotary machines like the high-speed Alexanderson alternators and the static Poulsen Arc generators.Most operators, however, still preferred spark transmitters because of their uncomplicated design and because the carrier stopped when the telegraph key was released, which let the operator ""listen through"" for a reply. With other types of transmitter, the carrier could not be controlled so easily, and they required elaborate measures to modulate the carrier and to prevent transmitter leakage from de-sensitizing the receiver. After WWI, greatly improved transmitters based on vacuum tubes became available, which overcame these problems, and by the late 1920s the only spark transmitters still in regular operation were ""legacy"" installations on naval vessels. Even when vacuum tube based transmitters had been installed, many vessels retained their crude but reliable spark transmitters as an emergency backup. However, by 1940, the technology was no longer used for communication. Use of the spark-gap transmitter led to many radio operators being nicknamed ""Sparks"" long after they ceased using spark transmitters. Even today, the German verb funken, literally, ""to spark,"" also means ""to send a radio message or signal.""
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