SPICE subcircuitopamp

Op-amp (ideal, rail clamp)

Ideal operational amplifier with finite open-loop gain; the output is clamped to the supply rails.

Schematic symbol

Key data

Category: ICs
Simulation model: SPICE subcircuit
Reference prefix: U
Pins: 5
Land pattern: SOT-23-5

Simulation model

The part is a small SPICE netlist (below), solved by the analog engine together with the rest of the circuit. Pin ids are the node names, {braces} are parameters.

SPICE netlist

E1 o 0 + - {A}
R1 o OUT 10
D1 OUT V+ DCL
D2 V- OUT DCL
Rin + - 10meg

.model DCL D(IS=1e-15 N=0.05)

Pins 5

Pin	Name	Use
+	+Passive pin	Non-inverting input
-	−Passive pin	Inverting input: feedback from OUT sets the gain
OUT	OUTPassive pin	Output: drives the load (feedback to the − input)
V+	V+Supply pin	Positive supply: 100 nF to GND
V-	V−Ground pin	Negative supply or GND (single supply)

Parameters 1

Open-loop gainA

Default100k

PCB

Verified land patternSOT-23-5