Enhancing the Slew rate and Gain Bandwidth of Single ended CMOS Operational Transconductance Amplifier using LCMFB Technique

Industry is continuously researching techniques to reduce power requirements, while increasing speed, to meet the demands of today’s low (battery) powered wireless systems. The operational transconductance amplifier (OTA) is a fundamental building block in analog (mixedsignal) design and its performance characteristics are the foundation of system level characteristics. Improving the performance of the fundamental amplifier structure, while avoiding costly silicon area and static power increases, is critical to improving system performance. The application of Local Common Mode Feedback (LCMFB) to the conventional OTA structure provides significant increases in gain-bandwidth and slew rate performance without an increase in static power and limited additional silicon area. In the presented research, local common mode feedback technique has been applied to single ended differential operational transconductance amplifiers. LCMFB provides wide-range programming of amplifier characteristics and increases the versatility of the amplifier structure.