I would think you would want less than 5V of ripple.5V i can tolerate in the output voltage
So you can tolerate 2V or ripple on the filtered PWM output? What are you doing with this signal that it can tolerate such a high ripple? Such a high value doesn't seem reasonable.something about 40%
You do realize that the speed of light is about 1ns/ft? So I don't see how you can resolve that sort of time using a 40kHz PWM signal and IR. One period of the 40kHz signal represents over 4 1/2 miles of travel time for light.there is a 5mm ir transmitter diode (40khz).
and a tsop1138 ir receiver sensor.
the distance between transmitter and receiver is variable
i want to calculate the distance.
but i have a problem! the output of tsop1138 is pulse and i want convert it to analog voltage and calculate it with ADC unit of micro controller.
At the risk of being repetitious, how fast a real time response do you need?the duty cycle is from 10% to 100%
i said , i used filters but i want something else to have a real time response
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