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Design of Fully Balanced Analog Systems Based on Ordinary and/or Modified Single-Ended Opamps
Zdzis taw CZARNUL Tetsuro ITAKURA Noriaki DOBASHI Takashi UENO Tetsuya IIDA Hiroshi TANIMOTO
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/02/25
Print ISSN: 0916-8508
Type of Manuscript: INVITED PAPER (Special Section on Analog Circuit Techniques and Related Topics)
fully balanced system, analog circuits, integrated circuit, filter, integrator, amplifier,
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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.