IF Band-Pass Filter Bank Switching Network based on ADG904-R for Wireless Infrastructure

Application Circuit uses uses three 140-MHz IF SAW filters with different bandwidths and two ADG904-R SP4T CMOS RF switches. The ADG904-R switches control which band-pass filter the RF signal will pass through. Only one filter is selectable at a time. This application is very common in wireless infrastructure applications, such as cell phone base stations and point-to point radio RF front ends. Selecting IF filters with different bandwidths results in more flexibility in controlling the various data rates in these systems