[SI-LIST] Flight Time Approximation
- From: "Adeel Malik" <adeelm@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 12 May 2003 18:10:18 +0500
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Hi All,
I have a question regarding the flight-time approximation for a
signal traveling from the driver to a receiver via a transmission line.
Consider the figure shown below or if you can't see that in your Email
software, view the word attached file
I want to find the max. time take by the signal to go from Low to high at
the receiver input. This time is dependent upon the rise time of the RC
network formed by the O/P Resistance of Driver and Input Capacitance of
Receiver plus the propagation delay of the transmission line (whether it's
microstrip or stripline ...).
Assume that we find the 10 % - 90 % charging time for the RC network which
can be approximated as t2 = 2.2 x R x C.
Now my question is that in order to find the complete flight time from the
driver to the receiver, should we add t1 ( the propagation delay of line) to
t2 (the charging time) or how we should add the delay effect of Transmission
line to the charging time ?>
Are there any other major factors that we need to consider while calculating
the max. delay for this scenario.
Regards,
Adeel.
Output Resistance
Transmission Line
R
With delay = t1
Driver
Receiver
C
Input Capacitance
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<DIV><SPAN class=3D568454212-12052003><FONT size=3D2>Hi =
All,</FONT></SPAN></DIV>
<DIV><SPAN class=3D568454212-12052003><FONT=20
size=3D2> I have a =
question=20
regarding the flight-time approximation for a signal traveling from the =
driver=20
to a receiver via a transmission line. Consider the figure shown below =
or if you=20
can't see that in your Email software, view the word attached=20
file</FONT></SPAN></DIV>
<DIV><SPAN class=3D568454212-12052003><FONT =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D568454212-12052003><FONT size=3D2>I want to find the =
max. time=20
take by the signal to go from Low to high at the receiver input. =
This time=20
is dependent upon the rise time of the RC network formed by the O/P =
Resistance=20
of Driver and Input Capacitance of Receiver plus the propagation delay =
of the=20
transmission line (whether it's microstrip or stripline=20
...).</FONT></SPAN></DIV>
<DIV><SPAN class=3D568454212-12052003><FONT size=3D2>Assume that we find =
the 10 % -=20
90 % charging time for the RC network which can be approximated as t2 =
=3D 2.2 x R=20
x C.</FONT></SPAN></DIV>
<DIV><SPAN class=3D568454212-12052003><FONT size=3D2>Now my question is =
that in=20
order to find the complete flight time from the driver to the receiver, =
should=20
we add t1 ( the propagation delay of line) to t2 (the charging time) or =
how we=20
should add the delay effect of Transmission line to the charging time=20
?></FONT></SPAN></DIV>
<DIV><SPAN class=3D568454212-12052003><FONT =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D568454212-12052003><FONT size=3D2>Are there any other =
<STRONG><U>major </U></STRONG>factors that we need to consider while =
calculating=20
the max. delay for this scenario.</FONT></SPAN></DIV>
<DIV><SPAN class=3D568454212-12052003><FONT =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D568454212-12052003><FONT =
size=3D2>Regards,</FONT></SPAN></DIV>
<DIV><SPAN class=3D568454212-12052003><FONT =
size=3D2>Adeel.</FONT></SPAN><SPAN=20
class=3D568454212-12052003><FONT face=3D"Times New =
Roman"> <?xml:namespace=20
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face=3D"Times New Roman"><SPAN=20
style=3D"mso-spacerun: =
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bsp; &nb=
sp; &nbs=
p; =20
</SPAN>Output Resistance <SPAN=20
style=3D"mso-spacerun: =
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Line</FONT></FONT></P>
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face=3D"Times New Roman"><SPAN=20
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