Op Amp Builder - Level 2

Create your own SPICE Macromodels

SPICE Circuit

op level 2 

Enter Basic Behaviors

Aol Open-Loop Gain (V/V)
fu Unity-gain Frequency (Hz)
or Gain Bandwidth Product (GBP)
Slew Max Max Vo change per micro second (V/us)
Rin Input R
Rout Output R

Enter 2nd and 3rd Poles

fp2 2nd pole
fp3 3rd pole
Initially set fp2=fp3=10 x fu.
Set to 100 x fu to remove effect.

Enter Voltage and Current Limits

Vo lim How close Vo swings to supply rails
Io lim Max output current

Enter Model Parameters

Subckt Name Name for SPICE subcircuit.
Device Name Name for SPICE subcircuit.
Precision (digits) Precision for moldel values.


C1 = I1max / (slew * 1000000) Capacitor for slew max and fp1.
fp1 = fu / Aol First pole filter to acheive fu.
R1 = 1 / (2 * pi * fp1 * C1) Resistor for fp1 and Aol.
KG1 = Aol / R1 Open-Loop Gain Aol = KG1 * R1.
C2 = 1 / (2 * pi * fp2 * R2) C for fp2.
C3 = 1 / (2 * pi * fp3 * R3) C for fp3.
EVL (See code) Voltage source for Vo Limit.
ECL (See code) Voltage source for Io Limit.

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