On the use of multi-path inductorless TIAs for larger transimpedance limit |
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Authors: | M. Hossein Taghavi Arshan Naji Leonid Belostotski James W. Haslett |
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Affiliation: | 1. Department of Electrical and Computer Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada
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Abstract: | This paper discusses the use of mutli-path inductorless transimpedance amplifiers (TIAs), consisting of several different second-order shunt-feedback sub-TIAs (SF-sTIAs) driven by the photodiode, to break the single-stage technology-dependent transimpedance limit. The advantage of the MP-TIA that is explored in this work is in its third-order transfer function, which provides additional degrees of freedom in tailoring the performance. Pole and zero locations of the MP-TIA transfer function are examined and verified with behavioural simulations. The theoretical transimpedance limit for MP-TIAs based on two SF-sTIAs is derived. The possibility of further increasing the transimpedance limit vs bandwidth trade-off by combining three and four sub-TIAs is investigated with simulations. A transistor-level design example of an MP-TIA is presented. The 0.13-μm CMOS MP-TIA achieves the largest figure-of-merit among published TIAs. |
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