Fully integrated voiceband codec in a standard digital CMOS technology

A 2.7-V complete voiceband codec with high-performance speech interfaces is presented. It includes a low-noise microphone preamplifier and loudspeaker/earpiece drivers. In the 4-kHz signal bandwidth, the ADC achieves a dynamic range of 80 dB and a full scale S/(THD + N) ratio of 71 dB, while the DAC...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2004-08, Vol.39 (8), p.1331-1334
Main Authors: Pernici, S., Stevenazzi, F., Nicollini, G.
Format: Article
Language:English
Subjects:
Bandwidth
Capacitors
CMOS
CMOS process
CMOS technology
Code standards
Codec
Digital
Dynamic range
Loudspeakers
Microphones
Noise levels
Preamplifiers
Semiconductor devices
Speech codecs
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Summary:A 2.7-V complete voiceband codec with high-performance speech interfaces is presented. It includes a low-noise microphone preamplifier and loudspeaker/earpiece drivers. In the 4-kHz signal bandwidth, the ADC achieves a dynamic range of 80 dB and a full scale S/(THD + N) ratio of 71 dB, while the DAC performs 84 dB and 75 dB, respectively. These performances have been obtained in a pure digital low-cost CMOS process. The only components used are standard nMOS and pMOS transistors, parasitic vertical PNP bipolar transistors, unsalicided poly resistors, nonlinear poly-nwell capacitors, and a few small linear capacitors made with a sandwich of five metals and poly. The active area is 2.7 mm/sup 2/ in a 0.35-/spl mu/m, five metal levels, standard digital CMOS technology. Power dissipation is 12 mW. The cell can be easily migrated in more advanced processes with area reduction. A migration in a 0.18-/spl mu/m digital CMOS process has been achieved.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2004.831483