| Summary: | 碩士 === 國立交通大學 === 電子工程系所 === 97 === OPAMPs are the fundamental module in the analog circuit and used in all kinds of circuits extensively. Developing the OPAMPs automatic design can speed up the research on analog circuit design and increase the competitiveness of the analog circuit products. A new concept to automatically optimize a MOSFET size is proposed in this thesis. An automatic process to synthesize operational amplifiers (OPAMPs) is designed based on the concept, and the automatic synthesis algorithm can make operational amplifiers achieve the optimal goal defined by this algorithm. It has been implemented by three common OPAMP topologies: Two Stage OPAMP, Folded Cascode OPAMP, and Telescopic OPAMP. They are designed and simulated by HSPICE. Furthermore the algorithm is realized by the program C++. Users choose the suitable OPAMP topology according to their application or demand for properties and input the specifications they require. The whole device sizes will be calculated out by algorithm. Finally, the execution results are verified to be able to fit corresponding specifications by simulator.
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