NDLI: Extension of the Input Common-Mode Range Beyond the Supply Rails of Operational Amplifiers and Comparators

Content Provider	IEEE Xplore Digital Library
Author	van der Horn, G. Huijsing, J.H.
Copyright Year	1992
Description	Author affiliation: Delft University of Technology, Dept. of Electrical Engineering, Mekelweg 4, 2628 CD, Delft, The Netherlands. Tel: +31.15. 781605 (van der Horn, G.; Huijsing, J.H.)
Abstract	When the input common-mode (CM-) voltage of an Operational Amplifier or Comparator exceeds the range of normal operation the (bipolar) input transistors saturate. This results in reversal of the signal polarity at the output, and in an increasing input bias current. These saturation effects cause very undesirable OpAmp behaviour. Satisfactory solutions for these problems are not found in existing input stage configurations. Novel circuit topologies for input stages with an extended CM-range are presented. The designed and realised input stages do not show the above-described adverse effects, and offer the advantage of an input CM-range extending far beyond the supply rails. The transconductance of these new input stages is constant over a full (extended) CM-range, and the input bias current is limited. A realisation of one proposed input stage configuration showed a CM-range that reached +14 Volt, at a supply voltage down to 1.3 Volt, while the input bias current was limited to 2.5 uA.
Starting Page	187
Ending Page	190
File Size	1287970
Page Count	4
File Format	PDF
ISBN	8798423207
DOI	10.1109/ESSCIRC.1992.5468253
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1992-09-21
Publisher Place	Denmark
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Operational amplifiers Rail to rail amplifiers Voltage Diodes Circuit topology Transconductance Rail to rail inputs Feedback loop Design optimization
Content Type	Text
Resource Type	Article

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