// S-Parameters › Amplifier Stability
Amplifier Stability Analyzer
Upload a 2-port S-parameter file (.s2p) to compute Rollett's K factor, the stability measure Δ, and the unilateral gain factor μ across frequency. The tool evaluates conditional vs unconditional stability and plots all metrics so you can see exactly where your device is at risk.
// How to use
1
Upload a .s2p Touchstone file — must contain S11, S21, S12, S22 across a frequency sweep. MA, RI, DB all supported.
2
Stability is computed at every frequency point. K, |Δ|, and μ₁ are plotted vs frequency.
3
Rollett criterion (K > 1 AND |Δ| < 1): both must hold at every frequency for unconditional stability.
4
Edwards-Sinsky μ₁ > 1 is a single-parameter unconditional stability test — strictly more informative than K alone.
5
Red dashed lines mark K = 1, |Δ| = 1 and μ = 1. Stable region: above K=1, below |Δ|=1, above μ=1.
// S-Parameter File
Drop .s2p file here
or click to browse
or click to browse
// Stability Formulas
Δ = S₁₁·S₂₂ − S₁₂·S₂₁K = (1 − |S₁₁|² − |S₂₂|² + |Δ|²) / (2|S₁₂||S₂₁|)
μ₁ = (1 − |S₁₁|²) / (|S₂₂ − Δ·S₁₁*| + |S₁₂·S₂₁|)
Unconditional: K > 1 AND |Δ| < 1
OR equivalently: μ₁ > 1
Upload a .s2p file to begin analysis.