The transmission used here has characteristic impedance of 60Ohm at the voltage pulse Tr=0.1 nsec
I am using a repeating voltage pulse to get the information of the characteristic impedance of the transmission line.
When the pulse drops to 0.3V, the node drops to 0.558V because at this short period it is seeing the transmission line as a resistor of 60Ohm
I learnt that this short period is the time for the signal to travel across the transmission line.
However if I increases the length of transmission line from 5cm to 20cm, the first pulse seems ok, the time it takes to travel across the line is 4 times and it is still dropping to 0.558V. But the successive pulses are not accurate, which deviates from 0.558V and have a weird shape.
What causes this I still don't understand? and how should I fix it? to let 20cm usable.
What causes this I still don't understand? and how should I fix it? to let 20cm usable.
I am using a repeating voltage pulse to get the information of the characteristic impedance of the transmission line.
When the pulse drops to 0.3V, the node drops to 0.558V because at this short period it is seeing the transmission line as a resistor of 60Ohm
I learnt that this short period is the time for the signal to travel across the transmission line.
However if I increases the length of transmission line from 5cm to 20cm, the first pulse seems ok, the time it takes to travel across the line is 4 times and it is still dropping to 0.558V. But the successive pulses are not accurate, which deviates from 0.558V and have a weird shape.
What causes this I still don't understand? and how should I fix it? to let 20cm usable.
What causes this I still don't understand? and how should I fix it? to let 20cm usable.
