RELEASED: rev 1.11; January 2012
1
The Scintera logo, Scintera™ & RFPAL™ are all trademarks of Scintera, Inc. All other trademarks are the property of their respective owners. No circuit patent
licenses are implied. Scintera reserves the right to change its product specifications at any time. © 2012 Scintera, Inc. All Rights Reserved.
SC1889: Adaptive RF Power Amplifier Linearizer &
Dual RMS Power Measurement Unit (PMU)
General Description________________
The SC1889 is part of Scintera’s 2
nd
generation RF
PA linearizer (RFPAL) family providing increased
ACLR correction over the previous generation as well
as support for EVDO, TD-SCDMA, WiMAX, HSDPA,
LTE and TD-LTE waveforms. The SC1889 is a fully-
adaptive, RFin / RFout predistortion linearization
solution that precisely compensates RF power
amplifier (PA) non-linearities including AM/AM and
AM/PM distortion, spectral regrowth, memory effects
and other system level impairments.
The SC1889 substantially increases the final stage
PA efficiency by reducing out-of-band energy. The
SC1889 is a complete system-on-chip (SoC) solution
optimized for Class A/AB and Doherty RF power
amplifiers operating at a power level of 5 W to 60 W
(RMS). The SC1889 measures the feedback signal
from the power amplifier output, and optimizes the
correction function by minimizing distortion. SC1889
correction function is generated using RF-domain
analog signal processing allowing the SC1889 to
operate over a wide bandwidth at very low power
consumption.
Features_________________________
SC1889 (PC = 00): RFPAL
RFin/RFout PA linearizer SoC in standard CMOS
Fully Adaptive Compensation
Low Power Consumption:
o Duty cycled (9 %) feedback: 420 mW
o Full adaptation: 1.06 W
Frequency Range: 698 MHz - 2800 MHz
Input Signal Bandwidth: up to 60 MHz
Up to 28 dB ACLR & 38 dB IMD improvement*
Packaged in 9x9 mm QFN package
Operating Case Temperature: -40
o
C to +100
o
C
Fully RoHS compliant, Green Materials
Pin compatible with SC1887 and SC1869
* Performance dependent on amplifier, bias & waveform
SC1889 (PC = 11): RFPAL + PMU (optional) *
Dual rms power detection unit (RFIN and RFFB)
o 30 dB of dynamic range
o 0.10 dB typical accuracy (top 20 dB)
o 0.50 dB typical accuracy (bottom 10 dB)
Frequency Range: 698 MHz - 2200 MHz
* Refer to SC18X9-PMU0011 datasheet for detailed
specifications.
Applications______________________
Cellular infrastructure
o Single/multi-carrier, multi-standard:
WCDMA/EVDO, TD-SCDMA, WiMAX,
WCDMA/HSDPA, LTE & TD-LTE
o Traditional in-cabinet BTS amplifiers, RRU,
tower mounted power amplifiers, microwave
backhaul, booster amplifiers, microcells,
picocells, DAS, AAS and MIMO systems
Other applications
o Software defined radios (SDR), mobile
military communications and TV white space
o Any application requiring PA linearization
Wide range of PAs and output power
o Amplifier: Class A/AB and Doherty
o PA output power: up to 60 W (RMS)
o PA Process: LDMOS, GaAs and GaN
Benefits__________________________
Ease of use
o Integrated RFin/RFout solution
o Operates over wide frequency band
o No software development required
o No training, algorithm development, control
required – automatically calibrates and
adjusts to the signal and PA environment
o Supports wide range of modulation schemes
Smaller total system form factors
o Reduced heat sink size and weight
o Small implementation size (< 9 cm
2
)
Reduces operating costs
o Reduces energy consumption supporting
Green initiatives
o Reduces amplifier power consumption and
thermal dissipation
o Increases amplifier reliability
Reduces BOM costs and total volume
o Power supply, heat sink and enclosure
o Reduced back-off reduces transistor costs