A 36V 48MHz JFET-Input Bipolar Operational Amplifier with 150µV Maximum Offset and Overload Supply Current Control

Abstract

This paper presents a 36V JFET -input bipolar operational amplifier with an unprecedented combination of DC precision (150µV offset, 1.5 µV/°C drift) and high speed (48MHz GBW, 160V/µs slew-rate). The high slew-rate is obtained using the well-known slew-boosting method. However, conventional slew-boost circuits can cause excessive power consumption when the amplifier inputs are overloaded and the output hits the rail. Therefore, a dedicated protection circuit was added that detects such an overload condition, and limits power consumption in this condition.