I am revisiting the topic of using LTspice for the design and analysis of electrical circuits after a hiatus of a few years.

I am creating a gain block based off an example in the textbook "SPICE-Simulation using LTspice IV", but I do not get the expected the result when I run the simulation in LTspice XVII despite everything being virtually the same between the textbook example and my LTspice version. (Please see attached images).

My LTspice model

Textbook example

I presume that my error is something very simple. Therefore, any insight that anyone with a fresh pair of eyes can provide, will be very much appreciated.

  • 1
    \$\begingroup\$ Your -2.5 V supply is actually +2.5 V in your first schematic. \$\endgroup\$
    – winny
    Feb 4, 2023 at 19:57
  • \$\begingroup\$ Oh, yes. That would cause what's being seen there. \$\endgroup\$
    – TimWescott
    Feb 4, 2023 at 21:13

1 Answer 1


Your voltage V3 is reversed. The effective supply of your op-amp is 0V as you have the same voltage at both positive and negative supply pins.


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