Comparators excel through high noise immunity

October 29, 2019 //By Christoph Hammerschmidt
Comparators excel through high noise immunity
Rohm has developed the BA8290xYxxx-C comparator family for sensor applications in vehicle systems, for example in control units and in the powertrain. These components are characterized by a high tolerance to electromagnetic interference (noise resistance). Further features are a low current consumption of 0.6 mA or 0.8 mA and a low offset voltage of ±5 mV. In contrast to conventional products whose output voltage can fluctuate up to ±20%, the BA8290xYxxx-C series limits output voltage fluctuations to ±1%.

Advances in computerization and higher component densities have led to increased electromagnetic noise in electric vehicles and cars equipped with Advanced Driver Assistance Systems (ADAS). However, the evaluation of the noise behavior of individual boards and systems and the implementation of noise reduction measures are not possible in isolation during the development phase. The evaluation and implementation of the measures must take place after the entire vehicle has been manufactured. This makes optimization against noise a very lengthy and costly process that often requires several repetitions.

In response, Rohm developed 2017 operational amplifiers using EMARMOUR technology. This technology is not only characterized by a high noise insensitivity, it also reduces the design resources for noise reduction measures. The operational amplifiers were well received by automotive manufacturers. In order to meet market requirements even better, Rohm is now presenting the first comparators based on EMARMOUR technology.

EMARMOUR is the brand name for Rohm products developed using proprietary technologies covering chip layout, processes and circuit design. This technology achieves extremely high noise suppression during ISO11452-2 testing, limiting output voltage fluctuations to ±1% across the entire noise frequency band. This high noise suppression not only reduces development resources and time, but also improves reliability by solving noise issues in automotive on-board system development.

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