ASIC implementation of a 16-kbps waveform coder using adaptive vector quantization

The development of an adaptive vector quantizer (AVQ) codec chip using Open Architecture Silicon Implementation System (OASIS) tools is described. The goal is development of a 16-kb/s AVQ coder prototype system which can be used as an alternative to the currently used 32-kb/s adaptive delta pulse code modulation (ADPCM). The AVQ semicustom chip layout uses 1.2- mu m CMOS technology, and consists of 157,191 transistors. The AVQ system is being designed with Mentor Graphics CAD tools and is a four-layer PC board encompassing over 60 analog and digital components.<
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