An integrated heterojunction bipolar transistor cascode opto
... are assumed to be constant. This model does not take into account saturation effects due to a voltage drop on the 50- load at high collector currents, which results in forward biasing of the base–collector junction. Neglecting the base–collector capacitance, the frequency response of the HBT is dete ...
... are assumed to be constant. This model does not take into account saturation effects due to a voltage drop on the 50- load at high collector currents, which results in forward biasing of the base–collector junction. Neglecting the base–collector capacitance, the frequency response of the HBT is dete ...
Rectification - NYCC SP-01
... the x-ray tube. But stop a minute- what kind of current is available for us to use on the x-ray machine? It is a 60 cycle alternating current. Alternating current means that the current flow keeps reversing direction and 60 cycle means that there are 60 pairs of reversals per second. Thus the stat ...
... the x-ray tube. But stop a minute- what kind of current is available for us to use on the x-ray machine? It is a 60 cycle alternating current. Alternating current means that the current flow keeps reversing direction and 60 cycle means that there are 60 pairs of reversals per second. Thus the stat ...
A Dual-Output Integrated LLC Resonant Controller and LED
... The advantage of LLC resonant converters is that they can reduce the switching loss and noise since switching components are softly commutated based on the resonant technique. Also, they can detect the load variation efficiently since a large voltage gain can be obtained with a small switching frequ ...
... The advantage of LLC resonant converters is that they can reduce the switching loss and noise since switching components are softly commutated based on the resonant technique. Also, they can detect the load variation efficiently since a large voltage gain can be obtained with a small switching frequ ...
Design Procedure for Compact Asymmetric SPDT Switches
... FET SPDTs can be found in [5], highlighting the possibilities underlying FET resonant techniques. In this case, 0.7 dB insertion loss and 28 dB isolation was reached by a 0.76 1.78 mm2 chip. Also in this case, the circuit exhibits a narrowband behavior. In fact, at 0.9 GHz from central frequency, ...
... FET SPDTs can be found in [5], highlighting the possibilities underlying FET resonant techniques. In this case, 0.7 dB insertion loss and 28 dB isolation was reached by a 0.76 1.78 mm2 chip. Also in this case, the circuit exhibits a narrowband behavior. In fact, at 0.9 GHz from central frequency, ...
Strong opto-electro-mechanical coupling in a silicon photonic crystal
... element is effectively one dimensional, being formed by two parallel metal wires. A strong coupling between the mechanical motion and the optical or electrical mode (in what follows we refer to the lower frequency mode as the electrical mode) can be realized by making the electromagnetic mode volume ...
... element is effectively one dimensional, being formed by two parallel metal wires. A strong coupling between the mechanical motion and the optical or electrical mode (in what follows we refer to the lower frequency mode as the electrical mode) can be realized by making the electromagnetic mode volume ...
Making Magnetron Sputtering Work: Reversing the Glow to Arc
... possible to quickly and inexpensively try a number of different ideas, limiting realization of hardware prototypes to the most promising ideas. Simulation results were used to generate a design concept that met all requirements. Important features to note are rapid current fall time, and quick curre ...
... possible to quickly and inexpensively try a number of different ideas, limiting realization of hardware prototypes to the most promising ideas. Simulation results were used to generate a design concept that met all requirements. Important features to note are rapid current fall time, and quick curre ...
Cavity magnetron
The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field while moving past a series of open metal cavities (cavity resonators). Bunches of electrons passing by the openings to the cavities excite radio wave oscillations in the cavity, much as a guitar's strings excite sound in its sound box. The frequency of the microwaves produced, the resonant frequency, is determined by the cavities' physical dimensions. Unlike other microwave tubes, such as the klystron and traveling-wave tube (TWT), the magnetron cannot function as an amplifier, increasing the power of an applied microwave signal, it serves solely as an oscillator, generating a microwave signal from direct current power supplied to the tube.The first form of magnetron tube, the split-anode magnetron, was invented by Albert Hull in 1920, but it wasn't capable of high frequencies and was little used. Similar devices were experimented with by many teams through the 1920s and 30s. On November 27, 1935, Hans Erich Hollmann applied for a patent for the first multiple cavities magnetron, which he received on July 12, 1938, but the more stable klystron was preferred for most German radars during World War II. The cavity magnetron tube was later improved by John Randall and Harry Boot in 1940 at the University of Birmingham, England. The high power of pulses from their device made centimeter-band radar practical for the Allies of World War II, with shorter wavelength radars allowing detection of smaller objects from smaller antennas. The compact cavity magnetron tube drastically reduced the size of radar sets so that they could be installed in anti-submarine aircraft and escort ships.In the post-war era the magnetron became less widely used in the radar role. This was because the magnetron's output changes from pulse to pulse, both in frequency and phase. This makes the signal unsuitable for pulse-to-pulse comparisons, which is widely used for detecting and removing ""clutter"" from the radar display. The magnetron remains in use in some radars, but has become much more common as a low-cost microwave source for microwave ovens. In this form, approximately one billion magnetrons are in use today.