3.5.5 GSM PAM (U101 : SKY77318)
The SKY77318 is an extremely small (6 x 6 mm), GSM PAM for handset applications. This module
has been optimized for excellent efficiency and Pout while maintaining high GSM/GPRS efficiency.
The small size and high performance is achieved with high-reliability GaAs HBT technology.
With 50Ω and output, no external matching or bias components are required. The module incorporates
two highly-integrated GaAs power amplifier die with a BiCMOS controller.
Each amplifier has three gain stages with on-die inter-stage matching implemented with a high Q
passives technology for optimal performance. The CMOS controller implements a fully integrated
power control within the module for GSM operations, and serves as the GPRS operations. This
eliminates the need for any external couplers, power detectors, current sensing etc., to assure the
output power level. The module has Tx enable and band select inputs. Module construction is a low-
profile overmolded land-grid array on laminate.
3. TECHNICAL BRIEF
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[Figure 1. 8] GSM PAM Schematic
