Reconfigurable Operational Amplifiers Utilizing Emerging RFETs

The inherent functional behavior of reconfigurable field effect transistors (RFETs) is applied to different topologies of operational amplifiers. This leads to op-amps with unique abilities. By switching the internal bias voltages, the proposed op-amps can still perform even if the supply voltage is inverted. Furthermore, we demonstrate that the tunability of RFETs allows for parameter adjustment at runtime. In that manner, the op-amp can be optimized for specific performance characteristics, such as higher DC-gain or GBW. The developed floating biasing circuit for the differential pair based on RFETs enables utilization of the full reconfigurability that would not be possible with regular CMOS devices.