eCircuit  Center 
LTSPICE SERIES

About SPICE | SPICE Basics | Running SPICE | CIRCUIT COLLECTION
SPICE Commands | SPICE Downloads | About | Contact | Home

Solve 10 Op Amp Design Issues w/ Custom SPICE Models

Why dive into these short design topics?

WHY CUSTOM MODELS?

Custom SPICE models provide powerful insight.

schematic

DESIGN TOPICS

Topic Design Issue Op Amp Behavior
1 DC Accuracy Open Loop Gain (Aol)
2 Bandwidth Unity-Gain Freq (fu)
3 Signal Shape Slew Rate Max
4 Voltage Clipping Voltage Limit
4 Current Clipping Current Limit
6 Output Offset Error Voffset
7 Output Offset Error Input Bias Currents  New!
9 Overshoot and Ringing Cstray (and Ccomp)
8 Overshoot and Ringing Ro (and Cload)
10 Overshoot and Ringing 2nd,3rd Poles

DESIGN STRATEGY

A simple apprach helps you solve design Issues!

sch    schematic

OP AMP MODELS

Op Amp Model Behaviors Modelled
opamp_1 Open-Loop Gain (Aol), Unity-Gain Freq (fu), Ro
opamp_2 add - Slew Rate Max
opamp_3 add - Voltage Limit, Current Limit, Floating Reference
opamp_4 add - 2nd and 3rd poles
 
  • Use opamp_1 early in the design cycle to develop the overall topology.
  • Later in the design, add higher level models.
  • Copy to new file and develop your own models.
  • NOTE: Input Offset Voltage and Input Bias Currents can be added externally to any model.

LEARNING STRATEGY

GET STARTED