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LTSpice transfer function

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Electronworks

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Anyone know how to do a transfer function in LTSpice?

Just as a quick circuit, I have connected a voltage ramp waveform to the base of an emitter follower. I want to plot the transfer function from base to emitter (then move on to move complex circuits later).

I have probed the base and the collector and have got transient analysis working quite happily. I cannot get the transfer function going though.

LTSPICE keeps spitting out the error: 'Transfer function source v not in circuit'.

Going back into the transfer function setup, I notice it has now changed my Vin reference to 'v'.

What am I doing wrong...?

All I want is a plot of Vin on the x axis and Vemitter on the Y axis.
 

crutschow

Well-Known Member
Most Helpful Member
Post the circuit diagram of the simulation.
 

crutschow

Well-Known Member
Most Helpful Member
In some Spice simulators the Transfer Function is the S-plane Laplace transfer function, not the transient or DC transfer function. I suspect LTSpice may be the same.

If you are looking for a plot of input voltage versus output voltage, do a DC sweep (if LTSpice offers that function).
 

MikeMl

Well-Known Member
Most Helpful Member
Look at the attached example
 

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