Current mirror simulation

[williamthomas]

Does anyone knows how to simulate a current mirror for power amplifier?
I want to find the output impedance for the current mirror to calculate the input stage gain.

 

[jackinnj]

Walt Jung wrote 2 articles on current sources for AX in 2007, and shows a method to test their impedance -- you can adapt the same setup to LTSpice or MultiSim -- here are the links:

http://waltjung.org/PDFs/Sources_101_P1.pdf

http://waltjung.org/PDFs/Sources_101_P2.pdf

and follow up letters:

http://www.waltjung.org/PDFs/AX_Letters_0907.pdf

 

[magnoman]

For dc, run the current into a voltage source and sweep the voltage.

Hope this helps
-Antonio

 

[jackinnj]

Here's how it's done in Multisim, you can do the same thing in LTSpice:

An externally hosted image should be here but it was not working when we last tested it.

 

[williamthomas]

For dc, run the current into a voltage source and sweep the voltage.

Hope this helps
-Antonio

can you please illustrate it for me? i get a better view this way.
thanks

 

[williamthomas]

Here's how it's done in Multisim, you can do the same thing in LTSpice:

An externally hosted image should be here but it was not working when we last tested it.

how would the connection be if i use this current mirror attached?

 

[magnoman]

Again, this is just the static od dc case (made resistor non-linear just for fun).

THanks
-Antonio