19-6955; Rev 0.1; August 2014

1

General Description

The SC1889 is part of Scintera’s 2nd generation RF

PA linearizer (RFPAL

ACLR correction over the previous generation as well

as support for EVDO, TD-SCDMA, WiMAX

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 5W to 60W

(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.

Applications

 Cellular Infrastructure

o

Single/Multicarrier, Multistandard:

WCDMA/EVDO, TD-SCDMA, WiMAX,

WCDMA/HSDPA, LTE, and 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 (SDRs), 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 60W (RMS)

o

PA Process: LDMOS, GaAs, and GaN

Features

SC1889 (PC = 00): RFPAL

 RFin/RFout PA Linearizer SoC in Standard

CMOS

 Fully Adaptive Compensation

 Low Power Consumption:

o

Duty Cycled (9 %) Feedback: 420mW

o

Full Adaptation: 1.06W

 Frequency Range: 698MHz to 2800MHz

 Input Signal Bandwidth: Up to 60MHz

 Up to 28dB ACLR and 38dB IMD Improvement*

 Packaged in 9mmx9mm QFN Package

 Operating Case Temperature: -40°C to +100°C

 Fully RoHS Compliant, Green Materials

 Pin Compatible with SC1887 and SC1869

SC1889 (PC = 11): RFPAL + PMU (Optional)**

 Dual RMS Power Measurement Unit (RFIN and

RFFB)

o

30dB of Dynamic Range

o

0.10dB Typical Accuracy (Top 20dB)

o

0.50dB Typical Accuracy (Bottom 10dB)

 Frequency Range: 698MHz to 2200MHz

Benefits

 Ease of Use

o

Integrated RFin/RFout Solution

o

Operates Over Wide Frequency Band

o

Reduced Software Development

o

No Algorithm Development or Control

Required—Automatically Adjusts to the

Signal and PA Environment

o

Supports Wide Range of Modulation

Schemes

 Smaller Total System Form Factors

o

Reduced Heatsink Size and Weight

o

Small Implementation Size (< 9cm

 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, Heatsink, and Enclosure

o

Reduced Back-Off Reduces Transistor Costs

SC1889

Adaptive RF Power Amplifier Linearizer

and Dual RMS Power Measurement Unit

*Performance dependent on amplifier, bias, and waveform.

**Refer to the SC1889-PMU0011 data sheet for detailed

specifications.