Abstract
This paper presents an 8-bit low power digital to analog converter (DAC) with radiation-hardened-by-design (RHBD) for cryogenic applications. Implemented in a 0.5μm SiGe BiCMOS technology, this cryogenic DAC is capable of operating over an ultra-wide temperature (UWT) range from -180°C to +120°C and under high-energy particle radiation environment on the lunar surface. A segmented R-2R binary code with thermometer code architecture is used for the DAC core, and a quadrature layout is used to improve the matching. The DAC achieves a measured differential nonlinearity by integral nonlinearity (DNL/INL) of ±0.2/0.3 least-significant-bit (LSB) in 27°C and ±0.6/0.9 LSB in -180°C. It consumes only 1mA current and occupies only 0.25mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> die area.
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