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Spice Circuit «PLUS | HOW-TO»

LTspice (free, best for beginners), ngspice (open-source), PSpice (commercial), HSPICE (high-precision). 2. The Core Components of a SPICE Netlist A netlist is the text description of your circuit. Every line follows this pattern:

Designing filters, amplifiers, or checking stability. 3. Transient Analysis (.TRAN) Plots voltage/current vs. time. Syntax: .TRAN 1u 10m → timestep 1 µs, stop at 10 ms.

.TRAN 1u 1m .AC dec 100 10 100k

[ComponentName] [Node1] [Node2] [Value]

R1 1 2 1k → Resistor R1 between nodes 1 and 2, 1 kΩ. Basic Components | Component | Prefix | Syntax Example | Meaning | |-----------|--------|----------------|---------| | Resistor | R | R1 1 2 1k | 1 kΩ | | Capacitor | C | C1 2 3 10u | 10 µF | | Inductor | L | L1 3 0 100m | 100 mH | | Voltage source | V | V1 1 0 DC 5 | 5V DC | | Current source | I | I1 2 0 DC 1m | 1 mA DC |

.OP Sweeps frequency, plots gain/phase (Bode plot). Syntax: .AC oct 100 1 1Meg → 100 points/octave from 1 Hz to 1 MHz.

.PROBE .END

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