Synchronic Filter Based on Switched Capacitor Filters for High Stability Phase-Detectors Systems

This paper presents a new filter topology for analog signals processing in phase detector and decoder systems. This procedure takes advantages of switched-capacitor filter to guarantee high stability of filter parameters, avoiding any kind of drifts and shifts of central frequency of band pass stages. So, it is possible to hold the value of additional phase introduced in the signal paths reducing uncertainty of measurement caused by both, temperature and long term drifts. In this paper, a discussion of proposed topology is presented, including several experimental results to demonstrate the right operation of system and its independence on temperature and time