A document discusses a silicon-oninsulator (SOI) complementary metal oxide/ semiconductor (CMOS) integrated- circuit operational amplifier to be replicated and incorporated into sensor and actuator systems of Mars- explorer robots. This amplifier is designed to function at a supply potential ≤5.5 V, at any temperature from –180 to +120 °C. The design is implemented on a commercial radiationhard SOI CMOS process rated for a supply potential of ≤3.6 V and temperatures from –55 to +110 °C. The design incorporates several innovations to achieve this, the main ones being the following:
- NMOS transistor channel lengths below 1 μm are generally not used because research showed that this change could reduce the adverse effect of hot-carrier injection on the lifetimes of transistors at low temperatures.
- To enable the amplifier to withstand the 5.5-V supply potential, a circuit topology including cascade devices, clamping devices, and dynamic voltage biasing was adopted so that no individual transistor would be exposed to more than 3.6 V.
- To minimize undesired variations in performance over the temperature range, the transistors in the amplifier are biased by circuitry that maintains a constant inversion coefficient over the temperature range.
This work was done by Mohammad Mojarradi, Greg Levanas, Yuan Chen, Elizabeth Kolawa, and Raymond Cozy of Caltech, and Benjamin Blalock, Robert Greenwell, and Stephen Terry of the University of Tennessee for NASA’s Jet Propulsion Laboratory. For more information, download the Technical Support Package (free white paper) at www.techbriefs.com/tsp under the Electronics/Computers category.
In accordance with Public Law 96-517, the contractor has elected to retain title to this invention. Inquiries concerning rights for its commercial use should be addressed to:
Innovative Technology Assets Management
Mail Stop 202-233
4800 Oak Grove Drive
Pasadena, CA 91109-8099
Refer to NPO-42111, volume and number of this NASA Tech Briefs issue.
This Brief includes a Technical Support Package (TSP).
Wide-Temperature-Range Integrated Operational Amplifier
(reference NPO-42111) is currently available for download from the TSP library.
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