Synchronous networks

"Synchronous" networks, also called "chopper" networks and "commutated" networks, consist of passive elements plus driven switches or choppers. R-C chopper networks have been used occasionally as compensating networks in A-C servos. Their main advantage is a response independent of carrier frequency variation, and freedom from zero drift. Their main disadvantage is noise output in the form of harmonics of the carrier. In this paper a rigorous analysis of an idealized R-C loaded chopper is presented. It is shown that the main component of the response is indeed independent of the carrier frequency.