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UCC2808A-1Q1 数据资料 dataSheet 下载
UCC2808A-1Q1 数据资料 dataSheet 下载

FREQUENCY RESPONSE ANALYZERS
FREQUENCY RESPONSE ANALYZERS

... A basic setup screen can be displayed by one touch. A special key is provided to facilitate setting procedure. ● Basic setup A basic setup screen is displayed simply by pressing the basic setup key. The upper lower limits, amplitude, and number of integrations for measuring frequency (sweep) can be ...
Lecture 14 Disadvantages of Transformers and Introduction to the
Lecture 14 Disadvantages of Transformers and Introduction to the

... inductors and use only magnetic coupling between the two L’s by purposefully winding them on the same magnetic core. This makes for a two winding inductor--each separately wound and isolated electrically from each other except for the common magnetic core coupling . We now lose the common ground. Cu ...
HMC733LC4B, WIDEBAND MMIC VCO w
HMC733LC4B, WIDEBAND MMIC VCO w

... Controlled Oscillator which incorporates the resonator, negative resistance device, and varactor diode. Output power and phase noise performance are excellent over temperature due to the oscillator’s monolithic construction. The Vtune port accepts an analog tuning voltage from 0 to +22V. The HMC733L ...
Itenberg_Piezoelectrics_USB_handheld_HW5
Itenberg_Piezoelectrics_USB_handheld_HW5

... times the power produced by the sole of the shoe. While the power generated by was small, other experiments have sought ways of reconfiguring the design to allow for increased usable production from the same stepping force. Experiments performed at Virginia Tech showed that by using smaller piezoele ...


... to use a slow horizontal sweet to bring the peaks close together so that there is always some peak close to the grid marks. At very slow speed the signal looks like a continuous band across the scope, which is a convenient display for amplitude measurements. However, you must change the sweet to che ...
BDTIC 1N5400 - 1N5408 General Purpose Rectifiers
BDTIC 1N5400 - 1N5408 General Purpose Rectifiers

... This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. ...
G - Iowa State University
G - Iowa State University

... is one for which we are all quite familiar. Although much heating is done with natural gas as the primary fuel, some heating is done electrically, and even gas heating systems always contain some electric components as well, e.g., the fans. Other thermostatic loads include space heaters/coolers, wat ...
TMA106G-L Triac (Bidirectional Triode Thyristor)
TMA106G-L Triac (Bidirectional Triode Thyristor)

... any other rights of Sanken or any third party which may result from its use. • Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of semiconductor products at a certain rate is inevitable. Users of Sanken products are requested to ...
Choosing the MAX1932 External Inductor, Diode
Choosing the MAX1932 External Inductor, Diode

MAX901B中文资料
MAX901B中文资料

... for analog VCCand fordigital VDDare also recommended. Close attentionshould be paid to the bandwidth of the decoupling andterminating components. Short lead lengths on theinputs and outputs are essential to avoid unwanted par-asitic feedback around the comparators. Solder thedevice directly to the p ...
Reducing Circulating Currents in Interleaved
Reducing Circulating Currents in Interleaved

... converters (ia1 and ia2 ) differ between the two solutions and generate significantly different circulating currents within the phases (icirc,a , icirc,b and icirc,c of Fig. 2) as well as ZSCC. The actual values are related to the selected parameters of the simulated system but the comparison of the ...
Piezoelectric Measurement System Comparison
Piezoelectric Measurement System Comparison

... Although the charge sensitivity of quartz is very low when compared to ceramics, the self capacitance is also very low resulting in a high sensitivity voltage signal, higher in fact than that from an equivalently proportioned ceramic element. A miniature IC metal oxide silicon field effect transisto ...
LM122 LM322 LM3905 Precision Timers
LM122 LM322 LM3905 Precision Timers

OPERATION MANUAL OF GYROSTAR® MODEL : ENC
OPERATION MANUAL OF GYROSTAR® MODEL : ENC

... 1) ENC-03J can detect angular velocity along only one axis. When using more than one of the same type ENC-03J at the same time, swelling may result on the output due to the mutual interference with sound waves of each sensing devices resonant frequency. Therefore, there are 2 types of the ENC-03J. O ...
FAN6921MR Integrated Critical Mode PFC and Quasi-Resonant Current Mode PWM Controller
FAN6921MR Integrated Critical Mode PFC and Quasi-Resonant Current Mode PWM Controller

... Adjustable Over-Temperature Latched (RT Pin) VDD Pin and Output Voltage OVP (Latched) Internal Over-Temperature Shutdown (140°C) ...
RF Power Measurement Basics RF Power Measurement
RF Power Measurement Basics RF Power Measurement

... The E9300 Power Sensor can handle power levels up to +33dBm peak with duration less than 10microseconds mean that these power sensors can be used for signals with high crest factors (or peak to average ratios). If the high peaks could not be handled this would effectively limit the dynamic range of ...
Combined Power Oscillator using GaN HEMT
Combined Power Oscillator using GaN HEMT

Linn Klimax 500 Twin Power Amplifier
Linn Klimax 500 Twin Power Amplifier

Dc Microgrids Stability
Dc Microgrids Stability

... operation • dc vs. ac • The discussion refers to the system’s main bus. Remember the discussion in the first class about Edison’s electric system. •No frequency/phase control is necessary in dc microgrids. • From a general point of view dc systems are simpler to control. • Lack of a monitoring varia ...
ISSCC 2017 Digest of Technical Papers
ISSCC 2017 Digest of Technical Papers

... It also offers the opportunity to address the extensive range of cellular bands with the same architecture and building blocks. Direct synthesis of carriers in the 5 to 6GHz unlicenced bands remains a challenge for RF-DACs operating in the 1st Nyquist band, as sampling rates in excess of 12GS/s are ...
ppt
ppt

Digital pixel readout integrated circuit architectures for LWIR
Digital pixel readout integrated circuit architectures for LWIR

Aalborg Universitet Microgrid Stability Controller Based on Adaptive Robust Total SMC
Aalborg Universitet Microgrid Stability Controller Based on Adaptive Robust Total SMC

Linearity Analysis of SiGe HBT Amplifiers Using a Power- W3B.3
Linearity Analysis of SiGe HBT Amplifiers Using a Power- W3B.3

... The rapid development of third-generation wireless communication systems demands efficient modulation and multiple access schemes, such as Wide-band Code Division Multiple Access (WCDMA) [1]. Since these systems provide for improved network performance, more stringent linearity is required for the t ...
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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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