A Lock-In Amplifier - Circuit Cellar
Lock-in amplifiers are sophisticated, somewhat specialized pieces of scientific instrumentation. The Infineon PSoC5LP System-on-a-Chip (SoC) contains most of the necessary circuit functions to implement a basic lock-in amplifier, and is supported by an excellent toolchain called PSoC Creator 4.4.
Infineon Pso Stanford Research Systems Chemistry Department Of Dalhousie University Princeton Applied Research Tech Used Capacitor Universal Filter
Source: circuitcellar.com