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a Precision, Wide Bandwidth 3-Port Isolation Amplifier AD210*
a Precision, Wide Bandwidth 3-Port Isolation Amplifier AD210*

... coupled isolation amplifiers must have a carrier to pass both ac and dc signals through their signal transformers. Therefore, some carrier ripple is inevitably passed through to the isolator output. As the bandwidth of the isolator is increased more of the carrier signal will be present at the outpu ...
AD7741/AD7742 Data Sheet
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... Power Supply Input. These parts can be operated from +4.75 V to +5.25 V and the supply should be adequately decoupled to GND. Ground reference point for all circuitry on the part. Address Inputs used to select the input channel configuration. External Clock Output. When the master clock for the devi ...
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... minimizing power, space, and noise. The device accepts a single LVDS input and repeats the signal at 10 LVDS outputs. Each differential output drives a total of 50Ω, allowing point-to-point distribution of signals on transmission lines with 100Ω terminations on each end. Ultra-low 120ps (max) peak-t ...
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... the pin externally for the drivers to operate normally. In some power systems, it is sometimes necessary to provide an additional overvoltage protection (OVP) or overcurrent protection (OCP) shutdown signal to turn off the power devices (MOSFETs or IGBTs) in case of failure of the main controller. A ...
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... In equation 2, P stands for the number of outputs with a parallel or thevenin termination. VOL, IOL, VOH and IOH are a function of the output termination technique, and DCQ is the clock signal duty cyle. If transmission lines are used, CL is zero in equation 2 and can be eliminated. In general, the ...
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... be demonstrated by analyzing the absolute oscillator without the inverter capacitor C4. Although the analysis of this second order system is trivial because N(s) is already in the form of s2 + ωo2, this method can be used for higher order circuits such as the 4th order ratio oscillator. ...
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... Distributed power systems connect spatially separate electrical power sources to electrical loads. Most designs use more than one voltage level, usually lower voltages at the source and load ends and higher voltages for long distance interconnects to reduce I 2 R losses in cabling. Before power elec ...
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... electromagnet) of a three-phase synchronous motor operating without load is shown in Figure 6.1. When the field current I F is minimum, the magnetic field produced by the rotor is weak and the motor consumes a maximum of reactive power (Q is positive). The reactive power that is consumed decreases t ...
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ADP1828 数据手册DataSheet 下载

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HMC253QS24 / 253QS24E

... The HMC253QS24 & HMC253QS24E are low-cost non-reflective SP8T switches in 24-lead QSOP packages featuring wideband operation from DC to 2.5 GHz. The switch offers a single positive bias and true TTL/CMOS compatibility. A 3:8 decoder is integrated on the switch requiring only 3 control lines and a po ...
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Pulse-width modulation



Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers, the other being MPPT.The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load.The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible. Typically switching has to be done several times a minute in an electric stove, 120 Hz in a lamp dimmer, from few kilohertz (kHz) to tens of kHz for a motor drive and well into the tens or hundreds of kHz in audio amplifiers and computer power supplies.The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on.The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on and power is being transferred to the load, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications channel.
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