PRODUCT SUMMARY
SKY68000-31: LTE Dual-Band Front-End Module for IoT
Applications
Cellular IoT modem devices targeting low-power wide area
network (LPWAN):
4G LTE technology capability
Dedicated LTE half-duplex operation (HD-FDD) for
LTE-M/NB-IoT
Designed to meet 3GPP Rel-13 specifications (with
compatible cellular transceiver)
LTE dual-band modem products (low-band and mid-band):
Band 13
Band 4
PAE optimized for Class 3 LTE output power (+23 dBm)
Rx
SAW
MB RX
LB RX
ANT
MB TX
PA
LB TX
PA
Tx LPF
MIPI
204643-001
Features
Cost-optimized front end for low-data-rate applications
Low-loss post-PA transmit front end for enhanced transmitter
efficiency (compared to LTE-FDD radio front ends)
Dual-band PA supporting APT mode of operation or Vcc fixed
supply (≥ 2.85 V)
Integrated low-pass filters for harmonic rejection to comply
with spurious emission requirements
Integrated SP4T antenna Tx/Rx switch
Integrated Rx SAW filters for out of band rejection for both
Band 13 and Band 4
Optimized to support LTE for 1 to 6 RB
MIPI
®
RFFE control interface, 2.0 compliant
Footprint-compatible with the SKY68001-31 and SKY68011-31
Adaptive biasing scheme for maximum PA efficiencies
Small, low-profile package (4 mm x 5 mm x 0.9 mm)
(MSL3 @ 260 °C per JEDEC J-STD-020)
Lead (Pb)-free and RoHS-compliant
Figure 1. SKY68000-31 Functional Block Diagram
Description
The SKY68000-31 is a hybrid, dual-band multi-chip RF front-end
(RFFE) module supporting cellular LTE-M/NB-IoT
(half-duplex system) transceiver platforms. The module
integrates the entire RF front end necessary for an LTE dual-band
radio operating in Band 13 and Band 4 including Rx SAW filters,
dual-band PA with bias controller, Tx low-pass harmonic filter,
antenna switch, and MIPI RFFE controller.
Tx Section
The PA load-line is optimized for high efficiency while
simultaneously meeting 3GPP ACLR and emissions mask
specifications with LTE up to 6 RB. An integrated LPF is
implemented to reject the PA and transceiver harmonics while at
the same time minimizing any post PA loss for an optimized
transmit current consumption. Out-of-band emissions
performance is emphasized by the design to be 3GPP-compliant
for Band 13 and Band 4.
Rx Section
Skyworks Green
TM
products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to
Skyworks
Definition of Green
TM
, document number
SQ04–0074.
Receive SAW filters are integrated in to the module along with the
necessary matching, yielding a 50
Ω
single-ended impedance for
the antenna and Rx ports. The SAW filters provide a high level of
rejection to out-of-band interferers protecting the transceiver
from high blocking signal levels and to support 3GPP LTE
blocking test conformance. The Rx SAW filters cascaded with the
low throw count switch establishes a lower insertion loss and
noise figure than conventional LTE receivers.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
204643C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 2018-07-27July 27, 2018
1
PRODUCT SUMMARY • SKY68000-31: LTE DUAL-BAND FRONT-END MODULE FOR IoT
Smart Biasing
For most IoT applications, the DC-DC converter might not be
available to control the VCC supply of the PA. With a fixed DC
supply, Smart Biasing allows for easy power control through the
MIPI interface by programming reduced bias current for lower
gain states. Based on the application, a set of 4 to 6 different bias
conditions with specific fixed-gain steps are predefined. For each
of the steps, the transceiver output power can be adjusted to
meet the desired total output power.
The key advantages of the smart biasing scheme are:
Saving current consumption during lower output power
operation
Easy programming of fixed-gain steps through the MIPI
interface
Reducing the required output dynamic range of the transceiver
MIPI RFFE Controller Interface
The SKY68000-31 functional operation is fully controllable by a
single MIPI interface which is used to drive the PA in various
optimized bias modes as well as providing band selection and
controlling the antenna switch Tx, Rx, and band selection.
Figure 1 shows the block diagram for the SKY68000-31.
Ordering Information
Part Number
SKY68000-31
Product Description
LTE Dual-Band Front-End Module for IoT
Evaluation Board Part Number
SKY68000-31EK1
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