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Op amps from ROHM aimed at sensor signal amplification

Posted: 18 Feb 2014     Print Version  Bookmark and Share

Keywords:ROHM Semiconductor  op amp  motion sensor  smartphone  tablet 

ROHM Semiconductor has announced the development of the BD5291G and the BD5291FVE low voltage, low offset operational amplifiers (op amp) intended to amplify signals from motion sensors such as accelerometers and gyroscopes.

Recent years have seen a growing number of devices such as smartphones, tablets and portable gaming systems that incorporate sensors to detect acceleration, angular velocity and other parameters. Sensors are often embedded in applications that convert physical changes to small electrical signals. To make use of these small signals, however, they must be amplified using sensor signal amplifiers, which are positioned downstream of the sensor and require sensitive analog technology to ensure high-accuracy amplification.

Both the BD5291G and BD5291FVE use ROHM's analog technology, enabling input/output full-swing operation at only 1.7V (vs. 1.8V with comparable devices). In addition, high common-mode rejection ratio results in a small-signal processing accuracy 18 times better than what can be achieved with ordinary low voltage operational amplifiers, making them ideal for sensor signal amplification.

BD5291G and the BD5291FVE

The devices feature low-voltage input/output full-swing operation that provides sufficient margin against supply voltage fluctuations. This makes them well-suited for applications with low supply-voltage requirements, noted the company. In addition, the low input offset voltage combined with high common-mode rejection ratio (70dB min vs. 45dB min with conventional products) makes it possible to amplify small signals (i.e. from sensors) with greater accuracy.

Applications of the devices include smartphones, tablet portable CD/DVD players, handheld gaming equipment and other devices using motion sensors, microphone amps, active filters, buffer amps, amplification circuits and general-purpose low voltage op amp applications.

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