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International Electrical Engineering Journal (IEEJ) Vol. 6 (2015) No.2, pp. 1749-1755
International Electrical Engineering Journal (IEEJ) Vol. 6 (2015) No.2, pp. 1749-1755

... filter. These types of loads are gaining more and more importance mainly in forms of AC to DC power supplies and front end AC to DC converters for AC motor drives The voltage injected in series with the load by series converter is made to follow a control law such that the sum of this injected volta ...
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... The HMC-AUH318 is a high dynamic range, three stage GaAs HEMT MMIC Medium Power Amplifier which operates between 71 and 76 GHz. The HMCAUH318 provides 24 dB of gain, and an output power of +17.5 dBm at 1 dB compression from a +4V supply voltage. All bond pads and the die backside are Ti/Au metallize ...
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SE2425U 数据资料DataSheet下载

... Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. ...
Calibrating Power Meters with the 5500A /5522A
Calibrating Power Meters with the 5500A /5522A

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... Jumper JU1 determines how the source voltage is to be applied. Place the shunt across pins 1 and 2 of jumper JU1 to use a divided-down source voltage. The external resistor-divider formed by R2 and R3 provides the voltage division. The second option is to shunt JU1 across pins 2 and 3, allowing the ...
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comparative study of maximum power point tracking techniques for

... close to a fixed percentage of the array’s open circuit voltage. In the MPPT technique, the converter is disconnected and the open circuit voltage is measured at regular sampling rates [9] [10]. The energy wasted by the sampling of the open circuit voltage is considered negligible in [11]. This meth ...
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... measured by inserting an ammeter in the current path. Thus, the circuit must be broken and the meter must be inserted so that current flows through the meter as shown in Figure 2.2. Second, current may be measured indirectly by breaking the circuit, connected a sense resistor in series with the circ ...
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... motherboard (in addition to the main 24-pin connector) to supply dedicated power for the processor. 4-pin Peripheral power connectors (usually called Molex for its manufacturer): These are the other, smaller connectors that go to the various disk drives of the computer. Most of them have four wires: ...
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04 Design Examples

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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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