DESCRIPTION
The ACPM-5251 contains all of the input and output matching networks, Vcc decoupling/bypass capacitors, RF input & output DC blocking capacitors as well as the daisy-chained directional coupler integrated into the module substrate PCB, all in a single 14-pad surfacemount leadless package with 4x5 mm from factor and 1mm thickness. The integrated directional coupler has a single coupledout port and is daisy-chained between the both bands with internally 50-terminated isolation port. It also has excellent coupler directivity in both bands allowing small coupled out power variation or delivered power variation caused by the load mismatch from the antenna. The coupler directivity, i.e. the power variation into the mismatched load is critical to the TRP performance of the mobile phones in the real operation as well as the spec. compliance test. The ACPM-5251 features CoolPAM-5 circuit technology which supports 3 power/gain modes – active bypass (low power), mid power, and high power modes.
Avago Technologies
