The NF HSA Series High Speed Bipolar Amplifiers have high speed, broad band (DC to max.10MHz) and the capability of supplying high voltage and high power. DC+ / DC- signal is variable continuously with wide output range of maximum 300Vp-p without switching. Furthermore, as Four-quadrant output is possible, source mode (providing a power to load from a power amplifier in coincidence of voltage polarity and current polarity as normal amplifier) and sink mode (sinking a power from load to power amplifier in reverse current) operation are available. Therefore, it is possible to drive smoothly a capacitive load and an inductive load like a piezo electric component, a solenoid and others. The HSA Series High Speed Bipolar Amplifiers are widely used in various applications.