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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
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3.5.6. GSM PAM (U101: SKY77329)
The SKY77329 is an extremely small (6x8 mm), GSM/EDGE PAM for handset applications. This
module has been optimized for excellent EDGE efficiency and Pout in a Polar Loop environment at
EDGE class E2 + operation while maintaining high GSM/GPRS efficiency.
The small size and high performance is achieved with high-reliability 3rd generation InGaP/GaAs HBT
technology. With 50Ω and output, no external matching or bias components are required. The module
incorporates two highly-integrated InGaP/GaAs power amplifier die with a CMOS 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 AM/AM path in EDGE 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.
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