Synthesis of Log-Domain Filters from First-Order Building Blocks

Authors: Edwards R.T.¹; Cauwenberghs G.²

Source: Analog Integrated Circuits and Signal Processing, Volume 22, Numbers 2-3, March 2000 , pp. 177-186(10)

Publisher: Springer

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Abstract:

Log-domain filters are an important class of current-mode circuits having large-signal linearity and increased tuning range over voltage-mode filter circuits of similar complexity. In this paper we describe synthesis of a single-ended, first-order filter circuit from static and dynamic translinear circuit principles, and show how higher-order filters can be easily constructed from the first-order building block. We address additional issues related to low-frequency (audio-frequency) filter design and present results measured from test circuits and a complete 15-channel filterbank system fabricated in 2 m and 1.2 m BiCMOS processes.

Keywords: log-domain filters; filterbanks; current-mode analog VLSI

Language: English

Document Type: Regular paper

Affiliations: 1: Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD 21218-2686 tim@bach.ece.jhu.edu 2: Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD 21218-2686 gert@bach.ece.jhu.edu

Publication date: 2000-03-01