Schreier Tool Set for Delta-Sigma Modulator Design (Dec. 1992) These programs are available via anonymous ftp from next242.ece.orst.edu (128.193.48.65). Please send me (schreier@ece.orst.edu) e-mail if you obtain a copy. That way, I can keep you posted regarding any updates and improvements that are made. To compile all the tools, type "make" in this directory. Compila- tion has only been verified on HP/Apollo machines. You will have to change the Makefiles to suit your environment. The bin direc- tory will then contain the executables which constitute the tool set. The examples directory contains an example design and simulation of a 4th-order delta-sigma modulator. The ntf is synthesized, simulated, mapped onto the cascade-of-resonators topology, simu- lated again, scaled for dynamic range and resimulated once more. Just modify your path to include the new programs and type "make" and watch it happen. To do all the simulations takes about one hour. Also included in this directory are NTF files for common single-loop modulators. The classes directory contains C++ classes which were used to build the tools. You may find them useful if you intend to code your own applications. The classes come with demo and help files (courtesy Giri Rangan at OSU (gnk@aldur.ece.orst.edu)). KNOWN BUGS: Documentation is scant. You get this README file, the example directory, the short PostScript description file Notes.ps and of course, the source code. spectralAnalysis does incorrect calculations for f0=1 when used with the -w option. Use another value for the test frequency. realize only works for even-order transfer functions. At present, there is no work-around; you have to do the calculations yourself.
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.
