On the use of multi-path inductorless TIAs for larger transimpedance limit

  • Authors:

  • M. Hossein Taghavi;Arshan Naji;Leonid Belostotski;James W. Haslett

  • Affiliations:

  • Department of Electrical and Computer Engineering, University of Calgary, Calgary, Canada T2N 1N4;Department of Electrical and Computer Engineering, University of Calgary, Calgary, Canada T2N 1N4;Department of Electrical and Computer Engineering, University of Calgary, Calgary, Canada T2N 1N4;Department of Electrical and Computer Engineering, University of Calgary, Calgary, Canada T2N 1N4

  • Venue:
  • Analog Integrated Circuits and Signal Processing
  • Year:
  • 2013

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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.