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Design automation of σΔ DACs using SIGGEN

✍ Scribed by Kevin Rowley; Colin Lyden

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
820 KB
Volume
29
Category
Article
ISSN
0026-2692

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✦ Synopsis

This paper presents a design tool dedicated to finding the optimum design solution for a EA DAC, based on a high level specification. The tool tackles the problem by first choosing the optimum EA modulator design by using a mixture of design equations and behavioral simulation. The tool enables a VHDL description of the interpolating stages and Y.A modulator to be generated. This facilitates automatic layout of the synthesized design. A high specification analog DAC cell completes the analog circuitry requirement. The layout of the analog part is manual but this is autoplaced and routed with the digital parts by commercial software.

Simulation results and layout data for a EA DAC design are presented as well as measurements from a fifth order, 18-bit ~A modulator. This design was fabricated on a 1.2/zm, double-metal double poly technology.

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