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Enhancing dynamic range in differential log-domain filters based on the two-filters approach

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1 Author(s)
Fox, R.M. ; Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA

The “two filter” method for designing differential log-domain filters does not allow true class AB operation of filters having complex poles. However, differential log-domain filter structures that pass DC offsets from the input current splitter to each internal state variable can operate linearly to fairly high output modulation indices. New low-VDD translinear current-splitter circuits are presented, including a harmonic-mean splitter, which produces increased DC offsets compared to geometric-mean circuits. The increased offsets are shown to allow significant increases in the range of indiscrete signals in differential log-domain filters with appropriate structures

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Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on  (Volume:2 )

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