The Digital Step Attenuator is a type of Monolithic Microwave Integrated Circuit (MMIC) designed for programmable and high-precision attenuation of microwave and RF signals. The device sets the attenuation level accurately through a digital control interface, featuring high attenuation accuracy, low insertion loss, fast switching speed and good consistency across the operating band. It is widely applied in radar systems, satellite communication, RF test instruments and electronic warfare, enabling precise signal power control and flexible link gain management.