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The SKY77155 System Smart? Power Amplifier Module (PAM) is a fully matched 8-pad surface mount module developed for Code Division Multiple Access (CDMA) / Personal Communications Service (PCS), Wideband CDMA (WCDMA), and Wireless Local Loop (WLL) applications. This small and efficient module packs full 1710–1785 MHz bandwidth coverage into a single compact package. The SKY77155 meets the stringent spectral linearity requirements of CDMA PCS and WCDMA transmission, with high power added efficiency for power output of up to 28 dBm. A low current pad (VCONT) is provided to improve efficiency for the low RF power range of operation. The single Gallium Arsenide (GaAs) Microwave Monolithic Integrated Circuit (MMIC) contains all active circuitry in the module. The MMIC contains on-board bias circuitry, as well as input and interstage matching circuits. The output match is realized off-chip within the module package to optimize efficiency and power performance into a 50-ohm load. This device is manufactured with Skyworks’ GaAs Heterojunction Bipolar Transistor (HBT) process that provides for all positive voltage DC supply operation while maintaining high efficiency and good linearity. Primary bias to the SKY77155 is supplied directly from a three-cell Ni-Cd, a single-cell Li-Ion, or other suitable battery with an output in the 3.2 to 4.2 volt range. Power down is accomplished by setting the voltage on the low current reference pad to zero volts. No external supply side switch is needed as typical “off” leakage is a few microamperes with full primary voltage supplied from the battery.