PRODUCT SUMMARY
SKY68020-11: LTE Universal Multi-Band Front-End Module
for IoT
Applications
Low-power, low-data-rate cellular IoT
Half-duplex operation (HD-FDD) LTE:
LTE-M
NB-IoT
LTE universal modem products:
Low-band: 5, 8, 12, 13, 14, 17, 18, 19, 20, 26, 28, 71, 85
Mid-band: 1, 2, 3, 4, 25, 39, 66, 70
Features
Output power: +24 dBm, optimized to support LTE
for 1 RB to 6 RB
Exceptional harmonics performance:
Band 13 2
nd
harmonic: -60 dBm/MHz
Band 28 2
nd
harmonic: -55 dBm/MHz
Band 28 3
rd
harmonic: -52 dBm/MHz
Broadband PA supporting APT mode of operation or Vcc fixed
supply: 2.85 V to 4.5 V
Integrated Tx low-pass filters for optimized harmonic rejection
Integrated SP6T antenna Tx/Rx switch
Integrated Rx low-pass filters for out-of-band rejection
Two broadband, high-power AUX ports for additional band
support
Low leakage current: 0.4 uA
Adaptive biasing scheme for maximum PA efficiencies
MIPI
®
RFFE control interface, 2.0 compliant
Pin-to-pin compatible with the SKY68000-31,
SKY68001-31, and SKY68001-41
Operating temperature range: -40°C to +85°C
Small, low-profile package (4 mm x 5 mm x 0.9 mm)
(MSL3 @ 260 °C per JEDEC J-STD-020)
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 low-band (5, 8, 12, 13, 14, 17, 18, 19, 20, 26, 28, 71, and
85), and mid-band (1, 2, 3, 4, 25, 39, 66, and 70) frequencies.
Figure 1. SKY68020-11 Functional Block Diagram
Description
The SKY68020-11 is a hybrid, multi-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 multi-band radio
operating in low-band (5, 8, 12, 13, 14, 17, 18, 19, 20, 26, 28,
71, and 85), and mid-band (1, 2, 3, 4, 25, 39, 66, and 70)
frequencies, including Rx low-pass filters, broadband PA with bias
controller, Tx low-pass harmonic filter, antenna switch, and MIPI
RFFE controller.
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
205139B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • September 13, 2018
1
PRODUCT SUMMARY • SKY68020-11: LTE UNIVERSAL MULTI-BAND FRONT-END MODULE FOR IoT
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.
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 SKY68020-11 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 SKY68020-11.
Ordering Information
Part Number
SKY68020-11
Product Description
LTE Universal Multi-Band Front-End Module for IoT
Evaluation Board Part Number
SKY68020-11EK1
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September 13, 2018 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 205139B
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