The SKY58091-11 Multimode Multiband Tx-Rx Front-End Module
(FEM) supports 2G/3G/4G/5G mobile devices and operates
efficiently in 3G/4G/5G modes. The SKY58091-11 is part of our
Sky5® product portfolio. The FEM consists of a low-band
3G/4G/5G PA block, low- and high-band 2G PA blocks, a silicon
controller containing the MIPI RFFE interface, RF band switches,
antenna switches, a bi-directional coupler, and integrated filters
for Bands 8, 12, 20 and 26. Extremely low leakage current
maximizes device standby time.
The IC die and passive components are mounted on a multi-layer
laminate substrate. The assembly is encapsulated in a 7.6 mm x
6.0 mm x 0.75 mm, 56-pad MCM, SMT plastic package which
allows a highly manufacturable, low cost solution.
The SKY58091-11 FEM is optimized for LTE Advanced which
utilizes Carrier Aggregation for higher data rates. The combined
filtering, RF matching and TRx switching internal to the FEM
optimizes performance for popular Downlink (DL) CA band
combinations in a compact and low cost solution. The FEM
contains the necessary components between the antenna and
RFIC transceiver and is optimized to provide superior Rx
sensitivity and Tx efficiency.
Selecting the linear-GMSK operation standard disables VRAMP
input, so all PA biasing depends only on MIPI mode selection. The
transmitted envelope is then a linear function of RF input.
Selecting VRAMP-enabled operation, the PA controller provides
VRAMP control of the GMSK envelope and reduces sensitivity to
input drive, temperature, power supply, and process variations.
Skyworks’ Finger-Based Integrated Power Amplifier Control
(FB-iPAC) minimizes output power variation into mismatch.
In EDGE linear mode, VRAMP voltage and MIPI-based bias
settings jointly optimize PA linearity and efficiency.
Exceptional RF coexistence planning and system techniques are
employed to minimize Rx de-sensitizing ("de-sense").