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Paper 1
Paper 1

... current. This insures that the VCSEL will remain on, and not drop below the threshold current as the modulation current reaches its minimum value. In addition, the standards specify that a flat 7.5dB of loss should be used in the optical link budget calculation despite the ease with which the actual ...
Slide 1
Slide 1

... Category III: used on permanently installed loads such as distribution panels, motors, and appliance outlets. Category IV: used on locations where current levels are high, such as service entrances, main panels, and house meters. ...
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DC1924A - Linear Technology

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AD9283 数据手册DataSheet下载

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Making Sense of Current Sensing
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... decide to throttle back the CPU frequency to reduce the load on the battery in order to extend battery life, while preventing the phone from overheating which increases reliability. There are even phone apps that can access the current sense reading circuit and make decisions to optimize the phone’s ...
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Data Sheet - Energy Recovery Products

... or guarantee regarding the suitability of its products for any parNcular purpose, nor does ERP assume any liability arising out of the applicaNon or use of any product or circuit, and specifically disclaims any and all liability, including without limitaNon special, consequenNal or incidental damage ...
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... if the switching phases are offset by 90 . The multi-tanh input cell improves the third-order input intercept point (IIP3) of the circuit [9], at the expense of a somewhat higher noise figure. The next two Sections will analyze the performance of the mixer. A. Analysis of the Multi-Tanh Differential ...
45 An OR Operation In this example an OR operation is used in
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... sensing, imaging, and communications. Its unique characteristic of penetration through fog/rain/cloud could enable all-weather radar and sensing. The wide bandwidth around this frequency also makes it very attractive to ultrahigh-speed wireless and satellite communications [1]–[3]. In these -band sy ...
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No Slide Title

Designing Power Window lifts with S12VR
Designing Power Window lifts with S12VR

... In Automotive it refers to the disconnection of the vehicle battery from the alternator while the battery is being charged. Due to such disconnection other loads will see a ...
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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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