Attila Kinali wrote:
On Thu, 12 Jan 2012 00:50:35 +1300
Bruce Griffiths<[email protected]> wrote:
Thats certainly not the case in the FS730C, the risetime isnt
appreciably affected by the small (4R7) damping resistor in series with Vcc.
Adding a series damping resistor in series with the output is
insufficient to suppress ringing.
How about using a ferit bead into the power supply instead of a resistor?
I'm thinking about something like a BLM18. The DC resistance is much lower
while HF resistance is much higher.
Attila Kinali
It may be useful if the ferrite bead parameters are just right.
However the bead HF resistance will increase the high frequency output
impedance in the high state which will adversely affect the high
frequency source impedance of the line driver.
Whereas a resistor increases the high state output impedance in a more
predictable way that can be easily compensated for particulalrly if a
similar resistor were used in series with the ground lead.
Bruce
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