Design and analysis of digital lock-in sine-wave amplitude detector based on TMS320C6xEVM

In order to recover the amplitude of weak sine wave that is usually buried in strong noise, a digital lock-in detector (DLID) has been proposed based on TMS320C6xEVM. The theory and structure of DLID are given in brief. Especially in the paper, some factors that would directly affect the frequency-resolution and lock-in precision of DLID are analyzed in detail, such as the integral time constant, the synchronization, the sample frequency, the dynamic range and the data type. Based on experiments, some consideration and suggestion are given to choose those important factors when you use or design a high performance DLID in your application.