Design of a MGy radiation tolerant resolver-to-digital converter IC for remotely operated maintenance in harsh environments

摘要

During future ITER maintenance operations, sensors and their embarked electronics will be exposed to a hostile and radioactive environment. This paper presents the design of a MGy radiation tolerant 16 bit resolver-to-digital converter (RDC) in 130nm CMOS technology. The RDC features a Type Ⅱ digital tracking loop, able to track resolvers with speeds up to 300 rps, and excitation frequencies up to 4 kHz. The RDC uses two integrated Δ∑-analog-to-digital converters (ADCs) to digitize the resolver outputs. The 16 bit, 10 kHz ADCs utilize a correlated double sampling technique to remove radiation induced offset and 1/f-noise. The front-end features a static angular resolution of 16 bits (4.2 arcsec_(rms)) and a resolution of 10 bits (6 arcmin_(rms)) at a rotor speed of 100 rps. The circuit has a simulated radiation tolerance exceeding 1 MGy. It has the ability to operate under temperatures up to 125℃, and to allow multiplexing with signals from other conventional sensors for compact, robust read-out architectures.