Digital Signal Processors for PCM CODEC Applications
B. Conq, Julie Leloup, P. Senn · European Solid-State Circuits Conference · 1982
Noise Shaping Coders when associated with digital filters may become an interesting alternative to switched capacitor circuits for integrated PCM CODECs with filters. As a realistic approach, we propose two processors which have been designed in a 6 ?m NMOS technology using a symbolic layout. In order to reduce the total area, distributed arithmetic techniques and a modified two's complement code have been used to implement the I.I.R. filters.