A power-efficient frequency compensation technique for four-stage transconductance amplifiers is proposed. Stability analysis and design equations are carried out based on the small-signal model. To verify the effectiveness of the compensation scheme, a four-stage amplifier is designed in a standard CMOS 65-nm technology. The compensation exploits passive components only and is implemented without entailing extra transistors, thus saving circuit complexity and power consumption. The amplifier achieves a 19-MHz gain-bandwidth product when driving a 1-nF capacitance by consuming only 80 μW from a 1-V supply. Simulation results show a significant improvement in both small-signal and large-signal amplifier performance with respect to prior art.
High-Performance Frequency Compensation Topology for Four-Stage OTAs
GRASSO, ALFIO DARIO;PALUMBO, Gaetano;PENNISI, Salvatore;DI CATALDO, Giuseppe
2014-01-01
Abstract
A power-efficient frequency compensation technique for four-stage transconductance amplifiers is proposed. Stability analysis and design equations are carried out based on the small-signal model. To verify the effectiveness of the compensation scheme, a four-stage amplifier is designed in a standard CMOS 65-nm technology. The compensation exploits passive components only and is implemented without entailing extra transistors, thus saving circuit complexity and power consumption. The amplifier achieves a 19-MHz gain-bandwidth product when driving a 1-nF capacitance by consuming only 80 μW from a 1-V supply. Simulation results show a significant improvement in both small-signal and large-signal amplifier performance with respect to prior art.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
