Modular analysis and design of log-domain circuits based on LIN↔ELIN transformations |
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Authors: | L. Feştilă R. Groza M. Cîrlugea A. Fazakas |
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Affiliation: | (1) Bases of Electronics Department, Technical University of Cluj-Napoca, Cluj-Napoca, Romania |
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Abstract: | We systematized and developed some procedures for the modular design of externally-linear internally nonlinear (ELIN) circuits resulting in a general LIN↔ELIN transformation procedure. This one was also extended to analysis of these types of circuits. The procedure is exemplified on log-domain circuits. In the design one starts with the linear block diagram (LIN) described by transfer functions and one substitutes directly each linear building block by a corresponding nonlinear one. The parameters of each nonlinear component depend on the given parameters of its linear correspondent. Input F −1 and output F blocks are added. In the analysis one identifies the nonlinear basic circuit components and each of them is substituted by its corresponding linear building block. Input and output F −1-F cells are removed. The ideal transfer function can be calculated on the linear block diagram now. The LIN↔ELIN transformations make a direct connection between equivalent linear and ELIN circuits, simplify their design and analysis procedures and permit the development of CAD procedures. |
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Keywords: | ELIN circuits Log-domain RLC ladder filters Modular analog VLSI design LIN-ELIN transformations |
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