Series shunt amplifier - How to evaluate the output resistance using pspice ?

H

handsup9987

New Member

• Sep 9, 2012

• #1

View attachment 67057rin = 2M, rout = 75

I have calculated the output resistance by hand , it is roughly 47ohm.
How to evaluate the output resistance using PSPICE ?
Thanks.

 

Last edited: Sep 9, 2012

ericgibbs

Well-Known Member

Most Helpful Member

• Sep 9, 2012

• #2

Hi,
I cannot open your file, what did you use to create it.??

Could you post a circuit diagram of the shunt circuit.??

 

H

handsup9987

New Member

• Sep 9, 2012

• #3

View attachment 67058

 

ericgibbs

Well-Known Member

Most Helpful Member

• Sep 9, 2012

• #4

hi,
I use LTSpice.

For simple check I would measure the 'EMF' Vout voltage of the OPA [ with a light load, say 47K] and then use a 1K load resistor and remeasure the Vout of the OPA.

The drop in Vout at the measured 1K load current is Rout.

 

H

handsup9987

New Member

• Sep 9, 2012

• #5

Hi, what do you mean by OPA ? And where do you connect 47K ?

 

ericgibbs

Well-Known Member

Most Helpful Member

• Sep 9, 2012

• #6

handsup9987 said:

Hi, what do you mean by OPA ? And where do you connect 47K ?

Click to expand...

The 741 is an OPerational Amplifier.

The loads would goto from the output pin of the 741 to 0V.

EDIT:
Look at page #5 of this pdf.

 

Last edited: Sep 9, 2012

J

Jony130

Active Member

• Sep 9, 2012

• #7

Open file and plot V(VOUT) / I(V9)