A Log-Domain CMOS Transcapacitor: Design, Analysis and Applications

Authors: Fragnie`re and E.; Vittoz E.¹; Schaik A.v.²

Source: Analog Integrated Circuits and Signal Processing, Volume 22, Numbers 2-3, March 2000 , pp. 195-208(14)

Publisher: Springer

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Abstract:

We present in this paper the CMOS implementation of a transcapacitor working in the log-domain. This circuit integrates a differential input current into an output pseudo-voltage, which is similar to the compressed voltage used as the internal variable in companding filters. This log-domain transcapacitor is compatible with pseudo-conductances implemented with a single transistor. The pseudo-transcapacitor circuit is analyzed and a collection of log-domain reactive components and small circuits using it is proposed.

Keywords: log-domain processing; pseudo-voltage; reactive components; transcapacitor; weak inversion CMOS

Language: English

Document Type: Regular paper

Affiliations: 1: CSEM, Swiss Center for Electronics and Microtechnology, Neuchaˆtel, Switzerland 2: School of Electrical and Information Engineering, The University of Sydney, Australia

Publication date: 2000-03-01