The spectacular growth of the Internet of Things (IoT) in recent years has led to a significant increase in the number of electronic components used for advanced control in a wide variety of applications. This trend toward higher electronic density is resulting in noisier environments, making it extremely difficult to implement electromagnetically compatible (EMC) designs. Operational amplifiers play a crucial role here because they rapidly amplify small signals (from sensors) in many safety-providing sensing systems. Furthermore, printed circuit board (PCB) designs can also be problematic for conventional operational amplifiers, which are susceptible to oscillation due to capacitive loads (e.g., from wiring).
To mitigate the noise problems common with conventional operational amplifiers 
, ROHM has developed the EMARMOUR™ series, featuring operational amplifiers with superior noise tolerance. The first and groundbreaking member of the EMARMOUR family was the BD77501G single-channel, high-speed CMOS operational amplifier, which leveraged original Nano Cap™ technology to prevent oscillation caused by load capacitance. This product has been well-received by many engineers in a wide variety of fields and regions, and our latest 2-channel version was developed to meet growing market demands.
The latest BD77502FVM integrates two operational amplifier devices that prevent oscillation while providing high-speed amplification with slew rates up to 10 V/µs and revolutionary electromagnetic interference (EMI) immunity. The output voltage across the entire noise frequency band is limited to less than ±20 mV, a value 10 times lower than that of a conventional operational amplifier. High-speed signal amplification can now be achieved without being affected by external noise or load capacitance when used in small-signal devices such as sensors, thus improving reliability while simplifying circuit designs.
Application Examples
• Facility management equipment, such as abnormal current and gas detectors
• Motors requiring high-speed control (signal transmission)
• Inverter control equipment
• Pre-buffers for transistor control
• ...and other industrial and consumer applications requiring high-speed signal transmission and amplification without concern for load capacitance.
MARMOUR™ CMOS operational amplifier range (see table)
