SKY77171 Datasheet | Skyworks Solutions

.. PRELIMINARY DATA SHEET SKY77171 Auto Smart™ Power Amplifier Module for WCDMA (1920-1980 MHz) Applications - WCDMA handsets Description The SKY77171 Auto Smart™ Power Amplifier Module (PAM) is a fully matched 10-pad surface mount module developed for Wideband Code Division Multiple Access (WCDMA) handsets. This small and efficient module packs full 1920- 1980 MHz bandwidth coverage into a single pact package. The SKY77171 meets the stringent spectral linearity requirements of WCDMA transmission with high power added efficiency for power output of up to 28 d Bm. Auto Smart TM power amplifier technology internally adjusts the RF transistor bias level throughout the dynamic operating range to minimize battery current consumption and ensure sufficient linear performance to meet WCDMA system requirements. The result is a significant savings in average battery current without the plications of a system-supplied mode function signal or analog bias control. Auto Smart™ response time is more than adequate for RF access probe and discontinuous transmission operation. The single Gallium Arsenide (Ga As) 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. Output match into a 50-ohm load is realized off-chip within the module package to optimize efficiency and power performance. The SKY77171 Auto Smart™ PAM is manufactured with Skyworks’ Ga As 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 SKY77171 is supplied directly from a three-cell nickel cadmium, a single-cell lithium ion, or other suitable battery with an output in the 3.2 to 4.2 volt range. Power down is acplished by setting the voltage on the low current reference pin to zero volts. No external supply side switch is needed as typical...