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Pulse Width Modulation. It varies the amount of time between pulses to send more or less data. The data is coded into the height and width of the pulse. PWM give you many more steps and much closer resolution if used properly. If used improperly you brain will explode and you will slap the dog on the way out to the funny farm. Hope this helps you a bit.
Bob
Pulse Width Modulation. It varies the amount of time between pulses to send more or less data. The data is coded into the height and width of the pulse. PWM give you many more steps and much closer resolution if used properly.
NO IT DOESN'T!
The time between pulses might not change. The width of the pulses change.
Data is not sent. PWM is simply an efficient way to vary an average voltage.
The height of the pulses do not change with PWM. The height is changed with PAM (Pulse Amplitude Modulation).
PWM does not give "steps". The width of the pulses are smoothly changed.
pulse width modulation (pwm) has different applications..............in circuits that deal with data transmission and communication, pwm is used to modulate analog signals i.e. an analog signal is transmitted by varying the width of the pulses of a digital signal................this is a form of analog signals into digital signals only for transmission.................. the second application is in power electronics..............it is used to vary the amount of power that gets to the load during a time period..............here we talk about duty cycle which is the percentage of time power actually gets to the load...........we use this principle in adjusting the speed of motors............also pwm is used in square-wave-output inverters to shape the output wave form to look more like a sine wave (i.e. a modified sine wave).......d applications r actually very numerous...........u should check out some diagrams online...............
in circuits that deal with data transmission and communication, pwm is used to modulate analog signals i.e. an analog signal is transmitted by varying the width of the pulses of a digital signal. this is a form of analog signals into digital signals only for transmission
PWM signal is still an analog signal. Maybe it is digital in the sense that the voltage level switches between two voltage levels (square wave), but it is not a time-discrete signal. The information in a PWM signal is analog. It would be very difficult (impossible) to send digital data using PWM (it is not an AD converter).
PWM signal is still an analog signal. Maybe it is digital in the sense that the voltage level switches between two voltage levels (square wave), but it is not a time-discrete signal. The information in a PWM signal is analog. It would be very difficult (impossible) to send digital data using PWM (it is not an AD converter).
I would call the method in section "Digital signal transmission" Pulse Width Keying, not Pulse Width Modulation. Compare to Phase Modulation and Phase-Shift Keying..
But ok.. I can see why that is an application of PWM.
Changing the width of the pulses changes the on/off time as well, provided the frequency stays the same. If the "On" pulse is widened, it shortens the amount of time it is off, and likewise if the "on" pulse is shortened, the off time increases. Therefore, the time between the pulses (a.k.a. the off time) IS changed.
PWM simply changes the ratio of the on time to the off time. All it does is change the duty cycle of the signal. This can be very useful in transformer drivers, motor speed control, light dimmers, voltage/power control, and various other applications.
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