A scanner system analyses data plotted in a scatter plot in accordance with user-specified criteria or statistical measures from the data population, to produce a scatter plot that displays in the plotted data the boundaries for the selection of out-lyer points andor otherwise visually denotes in the plotted data which points are the out-lyer points. For example, the endpoint defense system may include a controller, a set of protection devices, and a set of agents. Control and reduction of the loop filter capacitor leakage current leads to more reliable and stable phase locked loop behavior. Accordingly, based upon embodiments of the invention, a broadband, real-time signal analyzer circuit that allows for the deployment of RTSA devices in a distributed environment wherein determination of policy breaches, network performance, regulatory compliance, etc.