New CMOS op-amp delivers leading-class low noise

ROHM has recently announced a new CMOS op-amp claimed to have the lowest noise in the industry, optimised for industrial applications demanding high-accuracy sensing, such as accelerometers used in sonar systems, and optical sensors that manage ultra-small signals. Op-amps are configured at the rear stage to amplify the analog sensor output, but as sensor signals are so weak, it is essential to implement noise countermeasures to ensure high-accuracy transmission. In response, the company produced a high noise tolerant op-amp for the automotive market using a vertically integrated production system that leverages original analog design technologies and processes. The company has introduced an op-amp that produces what is claimed to be the industry’s best performance against external noise optimised for consumer devices and industrial equipment. The LMR1802G-LB developed employing the company's analog technology covering circuit design, processes, and layout, reduces input equivalent noise voltage density by half (2.9nV/vHz at 1kHz, 7.8nV/vHz at 10Hz) compared to conventional products, significantly enhancing the detection performance of sensor signals. Also, best-in-class phase margin (68-degrees) and capacitive load tolerance (500pF) provide outstanding stability (difficult to oscillate, easy to handle). This allows accurate amplification of voltages in the order of µV, ensuring support for industrial and consumer applications requiring high-precision sensing.