PRODUCT SUMMARY
SKY68001-31: LTE Universal Multi-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
Cat-M1/Cat-NB1
Designed to meet 3GPP Rel-12 and Rel-13 specifications
(with compatible cellular transceiver)
LTE universal modem products (low-band and mid-band):
Low-band B5/B8/B12/B13/B17/B18/B19/B20/B26
Mid-band B1/B2/B3/B4/B25/B39/B66
PAE optimized for Class 3 LTE output power (+23 dBm)
MB RX
LB RX
ANT
MB TX
PA
AUX2
Rx LPF
LB TX
PA
Tx LPF
MIPI
AUX1
204523-001
Figure 1. SKY68001-31 Functional Block Diagram
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)
Broadband 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 SP6T antenna Tx/Rx switch
Integrated Rx low-pass filters for out-of-band rejection
Optimized to support LTE for 1 to 12 RB
MIPI RFFE control interface, 2.0 compliant
Pin-to-pin compatible with the SKY68000-31 and SKY68011-31
Two additional Aux ports offer greater flexibility for more bands
on the Tx or Rx path
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
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.
Description
The SKY68001-31 is a hybrid, multi-band multi-chip RF front-end
(RFFE) module supporting cellular LTE CatM1/CATNB1
(half-duplex system) transceiver platforms. The module integrates
the entire RF front end necessary for an LTE multi-band radio
operating in low-band B5/B8/B12/B13/B17/B18/B19/B20/B26
and mid-band B1/B2/B3/B4/B25/B39/B66 frequencies, including
Rx low-pass filters, broadband 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 12 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 B5/B8/B12/B13/B17/B18/B19/B20/B26 and mid-band
B1/B2/B3/B4/B25/B39/B66.
Rx Section
Receive low-pass filters are integrated into the module along with
the necessary matching to yield a 50
Ω
single-ended impedance
for the antenna and Rx ports. The 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 low-pass filters are cascaded with the
low throw count switch to establish 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
204648B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 15, 2017
1
PRODUCT SUMMARY • SKY68001-31: LTE UNIVERSAL MULTI-BAND FRONT-END MODULE FOR IoT
Auxiliary Paths
The two AUX ports are additional broadband ports that can be
used symmetrically for either Tx or Rx operation. The AUX ports
can support conventional GSM power levels.
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 SKY68001-31 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 SKY68001-31.
Ordering Information
Product Description
SKY68001-31: LTE Multi-Band Front-End Module for IoT
SKY68001-31
Product Part Number
Evaluation Board Part Number
SKY68001-31EK1
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December 15, 2017 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 204648B
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