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Constant gm, rail-to-rail input transconductance stage with output common mode current compensation
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
2006 (English)In: 13th IEEE International Conference on Electronics, Circuits and Systems: ICECS '06 ; 10 - 13 Dec. 2006, Nice, France, Piscataway, N.J: IEEE Communications Society, 2006, 596-599 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a compensation structure to reduce the output common mode current of a rail-to-rail constant gm transconductance stage. The transconductance stage is a differential structure with the input transistors biased in weak inversion. This results in low power consumption and a simple relation between gm and tail currents. The constant gm is achieved by doubling the tail current in the active differential couple when the other one goes to cut off. Together with constant bias current in the output stage this can result in common mode bias current flowing from the output depending on the common mode input voltage. The proposed solution eliminates this problem by variation of the bias current in the output stage in relation to the tail currents in the differential couples. The transconductance stage was manufactured in a 0.35 um CMOS process. Measurement results are presented together with simulation data. The compensation structure cancels the common mode output currents for common mode input signals up to a frequency of 7 MHz.

Place, publisher, year, edition, pages
Piscataway, N.J: IEEE Communications Society, 2006. 596-599 p.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
URN: urn:nbn:se:ltu:diva-35581DOI: 10.1109/ICECS.2006.379859Scopus ID: 47349110343Local ID: a28d2630-8ed1-11db-8975-000ea68e967bISBN: 1-4244-0395-2 (print)OAI: oai:DiVA.org:ltu-35581DiVA: diva2:1008834
Conference
IEEE International Conference on Electronics, Circuits and Systems : 10/12/2006 - 13/12/2006
Note
Godkänd; 2006; 20061218 (ysko)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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