elektroda.net NewsGroups Forum Index - EDA CAD Electronics - PSpice TLOSSY Parameters
Bob Penoyer
Guest
Guest
Wed Aug 25, 2010 3:50 am
The TLOSSY transmission line has these parameters:
LEN - Electrical length
R - Per unit length resistance
L - Per unit length inductance
G - Per unit length conductance
C - Per unit length capacitance
All of these are clear to me except G. Since there is an R, what is
the purpose of G? My guess is that G is the conductance per unit
length between the center conductor and the shield. Correct?
PSpice objects when G is 100 or more times larger than C, so it
appears that PSpice is looking for a small number, i.e., a high
resistance. That's why I reached the conclusion stated above.
Helmut Sennewald
Guest
Guest
Fri Aug 27, 2010 11:33 pm
"Bob Penoyer" <bob_at_NOSPAMbobpenoyer.com> schrieb im Newsbeitrag
news:2p09765nt742n3vov8ukk5263kog8f6r07_at_4ax.com...
Quote:
The TLOSSY transmission line has these parameters:
LEN - Electrical length
R - Per unit length resistance
L - Per unit length inductance
G - Per unit length conductance
C - Per unit length capacitance
All of these are clear to me except G. Since there is an R, what is
the purpose of G? My guess is that G is the conductance per unit
length between the center conductor and the shield. Correct?
PSpice objects when G is 100 or more times larger than C, so it
appears that PSpice is looking for a small number, i.e., a high
resistance. That's why I reached the conclusion stated above.
LEN - Electrical length
R - Per unit length resistance
L - Per unit length inductance
G - Per unit length conductance
C - Per unit length capacitance
All of these are clear to me except G. Since there is an R, what is
the purpose of G? My guess is that G is the conductance per unit
length between the center conductor and the shield. Correct?
PSpice objects when G is 100 or more times larger than C, so it
appears that PSpice is looking for a small number, i.e., a high
resistance. That's why I reached the conclusion stated above.
Hello Bob,
G is the conductance between the center wire and the shield.
Best regards,
Helmut
Jim Thompson
Guest
Guest
Fri Aug 27, 2010 11:43 pm
On Tue, 24 Aug 2010 19:50:50 -0700, Bob Penoyer
<bob_at_NOSPAMbobpenoyer.com> wrote:
Quote:
The TLOSSY transmission line has these parameters:
LEN - Electrical length
R - Per unit length resistance
L - Per unit length inductance
G - Per unit length conductance
C - Per unit length capacitance
All of these are clear to me except G. Since there is an R, what is
the purpose of G? My guess is that G is the conductance per unit
length between the center conductor and the shield. Correct?
LEN - Electrical length
R - Per unit length resistance
L - Per unit length inductance
G - Per unit length conductance
C - Per unit length capacitance
All of these are clear to me except G. Since there is an R, what is
the purpose of G? My guess is that G is the conductance per unit
length between the center conductor and the shield. Correct?
Yes.
Quote:
PSpice objects when G is 100 or more times larger than C, so it
appears that PSpice is looking for a small number, i.e., a high
resistance. That's why I reached the conclusion stated above.
The dimension of C is Farads, per unit-length
The dimension of G is mho's (reciprocal of Ohms), per unit-length
If the conductance (resistive) is more than the effective conductance
of the capacitance you'd have a pretty bad line
...Jim Thompson
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