I was seeing unexpected results from simulating a circuit and decided to replicate the datasheet.
For the LF353/NS, openloop gain is 115db to 20Hz with a linear drop to zero at 5MHz, more or less. Vs=+-15, Rl=2K. I assumed this to be with the non-inverting input grounded, AC to the inverting input, and 2K to ground from the output. I see 15db to 100KHz with a drop to zero at 5MHz. I expected the model to be similar to the datasheet. The circuit is * LF353 MODEL TEST vs DATA SHEET Vin 2 0 DC 0 AC .001 0 Vp 4 0 +15 Vn 5 0 -15 R3 6 0 2K X1 0 2 4 5 6 LF353/NS .include ../opamp/lf353_sp3.mod Spice> run Spice> ac dec 100 1 10Meg Spice> plot db(v(6)/v(2)) What am I doing wrong? tomdean
