What is a CMOS OpAmp? Ultimately, a CMOS OpAmp is a voltage amplifier that is built using Metal Oxide Semiconductor (MOS) transistors that have been optimized for sensors. Because of the CMOS architecture, the engineer is able to improve performance in input bias current, offset voltage, and noise. This is primarily due to the benefits of CMOS architecture where input bias current between the sensor and the OpAmp is within the picoamp (pA) range (10-12 amps), which is about one thousandths of the input bias currently seen with bipolar architecture based solutions. Additionally, the table on this slide also shows a high level comparison between different architecture types. Not only has Rohm’s next generation CMOS amplifier improved upon noise, input bias current, and offset voltage concerns, but also improves application power consumption by allowing for lower voltage operation and decreasing current consumption of the OpAmp itself.