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A Robust SOI Gain-Boosted Operational Amplifier Targeting High Temperature Precision Applications up to 300°C
Keywords: SOI, Precision Applications, Opamp
Data acquisition and signal processing at elevated temperatures are facing various problems due to a wide temperature range operation, affecting the accuracy of the circuits' references and elementary building blocks. As the most commonly used analog building block, the opamp with its various limitations has to be enhanced for wide temperature range operation. Thereby major effort is put into maximizing signal gain and simultaneously reaching high gain-bandwidth also for high temperatures. Future robust design approaches have to consider a growing temperature range of operation and increasing device parameter mismatch due to the downsizing of integrated circuits. Addressing this critical issue, the compensation of these effects through new design approaches will have a lasting impact on circuit design. In this paper we present a high gain operational amplifier with a folded-cascode and gain-boosted input stage, fabricated in a 1.0 um SOI process. The input stage consists of nmos and pmos differential pairs, thus provides a rail-to-rail input operation. A second inverting stage provides additional gain and enhanced output voltage swing. The operational amplifier was designed for an operating temperature range of -40…300°C. Major effort was put in a robust design approach with reduces sensitivity to temperature variations, targeting high precision applications in a high temperature environment. With a supply voltage of 5 V, the maximum simulated current consumption of the chip is 168 uA, which leads to an overall maximum power consumption of 870 uW. The open loop DC gain of the amplifier is expected to reach a minimum gain of 106 dB and a unity-gain-frequency of 1.02 MHz at a temperature of 300°C. For all temperatures the phase margin varies from 55…60 degrees for a 3 pF load.
Alexander Schmidt,
Fraunhofer Institute for Microelectronic Circuits and Systems
Duisburg, Nordrhein-Westfalen 47058,

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