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J.M. Rivas, Y. Han, O. Leitermann, A.D. Sagneri, and D.J. Perreault, “A High-Frequency Resonant Inverter Topology with Low Voltage Stress,” 2007 IEEE Power Electronics Specialists Conference, pp. 2705 – 2717
J.M. Rivas, Y. Han, O. Leitermann, A.D. Sagneri, and D.J. Perreault, “A High-Frequency Resonant Inverter Topology with Low Voltage Stress,” 2007 IEEE Power Electronics Specialists Conference, pp. 2705 – 2717

... capacitance C1 of the class E circuit of Fig. 1 is oftentimes solely provided by the semiconductor drain-to-source capacitance. The non-linear variation of the device capacitance with drain voltage can further increase the voltage stress across the semiconductor, reaching a value of almost 4.4 times ...
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as a PDF

TRAX Transformer and Substation Test System
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... calculate transformer impedance, it uses the threephase equivalent method to calculate a result that can be compared with the nominal nameplate impedance value for the transformer. Frequency response of stray losses (FRSL) FRSL measurement is the same as impedance measurement; it supplies low voltag ...
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electromagnetic theory - Faculty of Engineering
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... 2. Set the slotted-line probe’s depth to 0.5 mm (preset by the lab technician). 3. Set the attenuator to > 2.8 mm (> 20 dB return loss). 4. Make sure that the SWR meter is in the normal deflection mode (set by the smaller dial at and on top of the range-gain knob). 5. Switch on the Klystron power su ...
EMG2016 - Faculty of Engineering
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... A2. Set the slotted-line probe’s depth to 0.5 mm (preset by the lab technician). A3. Set the attenuator to > 2.8 mm (> 20 dB return loss). A4. Make sure that the SWR meter is in the normal deflection mode (set by the smaller dial at and on top of the range-gain knob). A5. Switch on the Klystron powe ...
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... to +42.5 dB, respectively, when the gain up mode is selected and +42.5 dB to −2.5 dB, respectively, when gain down mode is selected. The gain down, or inverse, mode must be selected when operating in AGC in which an integrated square-law detector with an internal setpoint is used to level the output ...
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... transformer, which has low DC resistance to ground. If the RF source is not DC blocked, then a series blocking capacitor must be used. The RF input is internally matched from 1.7GHz to 3GHz. Operation down to 400MHz or up to 3700MHz is possible with simple external matching. ...
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... is recommended, placing as close as possible to the device’s VDD lead. For filtering lower-frequency noise signals, a large capacitor of 10µF (ceramic) or greater placed near the audio power amplifier is recommended. Input Capacitior (CI) Large input capacitors are both expensive and spce hungrt for ...
Aalborg Universitet
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... proposed [4]-[7]. Compared to the conventional LCL-filter, it inserts a small inductor in the branch loop of the capacitor composing an Lf-Cf series resonant circuit tuned at the switching frequency, which can meet the harmonic current recommendations of IEEE 519-1992 with smaller inductance or capa ...
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Decibel

The decibel (dB) is a logarithmic unit that expresses the ratio of two values of a physical quantity, often power or intensity. One of these quantities is often a reference value and in this case the decibel expresses the absolute level of the physical quantity. The number of decibels is ten times the logarithm to base 10 of the ratio of two power quantities, or of the ratio of the squares of two field amplitude quantities. One decibel is one tenth of one bel, named in honor of Alexander Graham Bell; however, the bel is seldom used.The definition of the decibel is based on the measurement of power in telephony of the early 20th century in the Bell System in the United States. Today, the unit is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory. In electronics, the gains of amplifiers, attenuation of signals, and signal-to-noise ratios are often expressed in decibels. The decibel confers a number of advantages, such as the ability to conveniently represent very large or small numbers, and the ability to carry out multiplication of ratios by simple addition and subtraction. By contrast, use of the decibel complicates operations of addition and subtraction.A change in power by a factor of 10 is a 10 dB change. At the half power point an audio circuit or an antenna exhibits an attenuation of 3dB. A change in voltage by a factor of 10 results in a change in power by a factor of 100, which is a 20 dB change. A change in voltage ratio by a factor of two approximately corresponds to a 6 dB change.The decibel symbol is often qualified with a suffix that indicates the reference quantity that has been used or some other property of the quantity being measured. For example, dBm indicates a reference power of one milliwatt, while dBu is referenced to approximately 0.775 volts RMS.In the International System of Quantities, the decibel is defined as a unit of measurement for quantities of type level or level difference, which are defined as the logarithm of the ratio of power- or field-type quantities.
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