A monolithic Delta A/D and D/A converter with filter forbroad-band speech coding

A monolithic Delta A/D and D/A converter with filter forbroad-band speech coding

The authors present a 5-V-only 14-b, 16 ksamples/s linear codec suitable as the audio part of a CCITT G722 codec. The device uses second-order sigma-delta modulation for both analog/digital (A/D) and digital/analog (D/A) conversion at 2.048 Msamples/s. A time-continuous modulator with integrated ant...

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Veröffentlicht in:IEEE journal of solid-state circuits 1991-12, Vol.26 (12), p.1920-1927
Hauptverfasser: Lerch, R G, Lamkemeyer, M H, Fiedler, H L, Bradinal, W, Becker, P
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container_end_page 1927
container_issue 12
container_start_page 1920
container_title IEEE journal of solid-state circuits
container_volume 26
creator Lerch, R G
Lamkemeyer, M H
Fiedler, H L
Bradinal, W
Becker, P
description The authors present a 5-V-only 14-b, 16 ksamples/s linear codec suitable as the audio part of a CCITT G722 codec. The device uses second-order sigma-delta modulation for both analog/digital (A/D) and digital/analog (D/A) conversion at 2.048 Msamples/s. A time-continuous modulator with integrated antialias filtering is used at the A/D side, obviating the need for an external antialiasing filter. The digital filters for decimation and interpolation are implemented with both a custom digital signal processor (DSP) and specialized hardware. The device was realized with 74000 transistors on a 31-mm(2) die in a 3-mum SACMOS technology. A dynamic range of more than 80 dB and a passband ripple of 0.3 dB were attained with A/D and D/A paths in cascade
doi_str_mv 10.1109/4.104185
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title A monolithic Delta A/D and D/A converter with filter forbroad-band speech coding
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