PIN / APD Photodiode Transimpedance Amplifier (TIA) C_f Stability & Noise-Gain Solver

Deterministic Closed-loop TIA 2nd-order Butterworth feedback C_f = sqrt(C_in_total / (2*pi*R_f*GBW)) + piecewise noise-spectral-density integration (thermal 4kTR_f + shot 2qI_pd + e_n*(1+C_in/C_f)) engine (.json, .csv, .sp) built for Hamamatsu, Thorlabs, Analog Devices, Texas Instruments — zero-upload ephemeral Wasm RAM execution.

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