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CMOS Op-Amp from ROHM

ROHM is making available a CMOS op-amp that features the lowest noise in the industry and which has been optimised for applications requiring high-accuracy sensing, such as accelerometers used in sonar systems, and optical sensors that handle ultra-small signals.

Used to detect and convert various environmental and physical changes into signals, sensors demand high accuracy, but at the same time peripheral sensor circuitry is trending towards lower voltages to achieve greater power savings.

Op-amps are configured to amplify the analogue sensor output, but as sensor signals tend to be weak it is necessary to implement noise countermeasures to ensure high-accuracy transmission. ROHM has developed a high noise tolerant op-amp for the automotive market utilizing a vertically integrated production system that leverages original analogue design technologies and processes.

The LMR1802G-LB reduces input equivalent noise voltage density by half (2.9nV/√Hz at 1kHz, 7.8nV/√Hz at 10Hz) compared to conventional products, significantly improving the detection performance of sensor signals. In addition, best-in-class phase margin (68°) and capacitive load tolerance (500pF) provide stability (difficult to oscillate, easy to handle). This enables accurate amplification of voltages in the order of µV, ensuring support for applications requiring high-precision sensing.

Author
Neil Tyler

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