Hi Everyone,
I am new to circuits. I am trying to find out a way to reduce the rise/fall time in a digital line[for digital protocols] caused by cable capacitance using some external circuits. We tried to create a prototype using an Op-AMP comparator [using UA741CP], which acts as a switching circuit and eliminate the rise/fall time in the digital line. We saw a 6us rise/fall time in the output signal but based on the slew rate of the device 0.5V/us, we understand for 3.3V around 6 us rise time will be there [To avoid this rise/fall time we can order Op-AMP with better slew rate]. In addition to that, we saw a delay of around 9us second between the falling edge of the input signal to the falling edge of the output signal. We were not sure about the reason for the delay. Can anyone help us in understanding the reason for this delay or suggest a proper Op-AMP to avoid this delay. I will be also good to explain us if there is any other way to reduce the rise/fall time in the digital line. I have attached our connection and observation images.
Thanks in advance!
I am new to circuits. I am trying to find out a way to reduce the rise/fall time in a digital line[for digital protocols] caused by cable capacitance using some external circuits. We tried to create a prototype using an Op-AMP comparator [using UA741CP], which acts as a switching circuit and eliminate the rise/fall time in the digital line. We saw a 6us rise/fall time in the output signal but based on the slew rate of the device 0.5V/us, we understand for 3.3V around 6 us rise time will be there [To avoid this rise/fall time we can order Op-AMP with better slew rate]. In addition to that, we saw a delay of around 9us second between the falling edge of the input signal to the falling edge of the output signal. We were not sure about the reason for the delay. Can anyone help us in understanding the reason for this delay or suggest a proper Op-AMP to avoid this delay. I will be also good to explain us if there is any other way to reduce the rise/fall time in the digital line. I have attached our connection and observation images.
Thanks in advance!
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