Design of Fully Balanced Analog Systems Based on Ordinary and/or Modified Single-Ended Opamps |
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Authors: | Zdzislaw Czarnul Tetsuro Itakura Noriaki Dobashi Takashi Ueno Tetsuya Iida Hiroshi Tanimoto |
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Affiliation: | (1) System LSI Division Toshiba Corporation, Kawasaki-shi, 210–8520, Japan;(2) Research and Development Center, Toshiba Corporation, Kawasaki-shi, 210–8582, Japan |
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Abstract: | The system architectures, which allow a high performance fully balanced (FB) system based on ordinary/modified single-ended opamps to be implemented, are investigated and the basic and general requirements are formulated. Two new methods of an FB analog system design, which contribute towards achieving both a high performance IC system implementation and a great reduction of the design time are presented. It is shown that a single-ended system based on any type of opamp (rail-to-rail, constant gm, etc.), realized in any technology (CMOS, bipolar, BiCMOS, GaAs), can be easily and effectively converted to its FB counterpart in a very practical way. Using the proposed rules, any FB system implementation with opamps (data converter, modulator, filter, etc.) requires only a single-ended system version design and the drawbacks related to a conventional FB system design are avoided. The principles of the design are pointed out and they are verified by experimental results. |
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Keywords: | fully balanced system analog circuits integrated circuits filters integrators amplifiers |
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