Product specifications

Software gating

The IF gating in the narrowband filter path uses hardware switches driven by

a pulse generator, which leaves residual noise at the gate off time caused by

internally generated noise and the switch isolation. When hardware IF gating

and an internal pulse generator are used, the on and off times of the gated

signal can be determined precisely. Since the off times of the gate contain

undesirable noise and residual gate isolation, the algorithm can replace the

off times with an ideal off state (i.e. zeros), thereby improving the receiver

sensitivity. Figure 19 shows how the software gating improves measurement

sensitivity.

Figure 19. Software gating replaces the residual noise with ideal zeros and

increases the receiver sensitivity