An SOI Precision Reference and Bias Circuitry for Operation to 250°C
نویسندگان
چکیده
An SOI precision voltage reference has been developed and verified that provides a buffered, low-noise output well suited for general purpose high temperature and/or wide temperature range applications. The reference provides 0.3% accuracy from 25°C to 225°C, with rms output noise of less than 5μV at 225°C. This reference was designed for use as a reference source for high-resolution A-to-D converter. The reference is buffered to provide up to 5mA source/sink capability and is adjustable via external components and a feedback pin. Associated with the reference on the same die are bias and utility functions. These include Proportional to Absolute Temperature (PTAT) current-mode and voltage-mode thermometer outputs and reference current sources. A wide variety of applications and temperature compensation schemes can be supported by this combination of functions in a single component. The reference uses lateral bipolar transistors fabricated in an SOI CMOS using the standard CMOS layout layers. This work has been performed within the Department of Energy DeepTrek Program with the participation of industry partners in a Joint Industrial Participant (JIP) program.
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