Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

How do I calculate an input impedance?

Status
Not open for further replies.

isend

Newbie level 3
Joined
Sep 11, 2009
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,315
what input impedance do i need


This may look like a basic homework problem, but I am just learning... I have a lossless transmission line (characteristic impedance = 70 Ohm, 1.5 cm long) connected to a load of 50 Ohm. How do I calculate the input impedance of this combination? I think Zin should be dependent on the RF frequency due to the impedance mismatch; something looks like:

but I need a formula for it. Where may I find some instructional material online which I can follow to calculate the input impedance for my setup? Thank you very much.
 

tyassin

Advanced Member level 1
Joined
Jul 22, 2004
Messages
462
Helped
84
Reputation
166
Reaction score
38
Trophy points
1,308
Activity points
3,000
input impedance calculation

Hi

try Google.......transmission line input impedance

you will find plenty...like Wikipedia

regards
 

linaweku

Junior Member level 1
Joined
Mar 2, 2008
Messages
17
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,283
Activity points
1,371
calculating input impedance

how is it? can you get the answer?
 

RFCMOS

Full Member level 2
Joined
May 5, 2005
Messages
144
Helped
20
Reputation
40
Reaction score
0
Trophy points
1,296
Location
France
Activity points
1,971
equation to calculate the input impedance

Hi

You have already been given the formula to compute this impedance by dhavalelectron...

regards,
 

isend

Newbie level 3
Joined
Sep 11, 2009
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,315
find the input impedance calculate

Thank you dhavalelectron! I also found the formula in Wikipedia following tyassin's instruction. Thank you everyone!
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top