Analog Lock-In Amplifier v0.1 Concept Note

Abstract

Analog Lock-In Amplifier v0.1 is a laboratory demonstrator intended to recover and measure a weak periodic signal of known frequency and phase when obscured by broadband or random noise. This Version 1.2 is the first public presentation of the approved concept. It describes the phase-sensitive analog architecture, initial 10 kHz mutual-induction demonstration, principal risks and first design direction. Gate 0 was passed on the basis of the retained Concept Note Version 1.1 dated 9 September 2026 and is recognised by KTI-MAND-SINS-ALA-001. Gates 1 through 5 remain open; no validated performance, certification, pilot readiness or commercial release is claimed.