Adaptive RF Power Amplifier Linearizer with Dual RMS Power Measurement Unit

The SC1889 is part of the 2nd generation RF PA linearizer (RFPAL) family providing increased ACLR correction over the previous generation as well as support for EVDO, TD-SCDMA, WiMAX, HSDPA, FDD-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.

The data sheet for the SC1889 PMU product variant is available for download.

Note: All SCxx parts are RoHS. An appended “E” at the end of the part number indicates 7” Tape and Reel. No appended letter or a “K” at the end of the part number indicates bulk.

Applications

* Cellular Infrastructure * Wide Range of PAs and Output Power

* SC1889 (PC = 00): RFPAL

* RFin/RFout PA Linearizer SoC in Standard CMOS

* Fully Adaptive Compensation

* Low Power Consumption:

* Duty Cycled (9%) Feedback: 420mW

* 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 9mm x 9mm 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 Detection Unit (RFIN and RFFB)

* 30dB of Dynamic Range

* ±0.10dB Typical Accuracy (Top 20dB)

* ±0.50dB Typical Accuracy (Bottom 10dB)

* Frequency Range: 698MHz to 2200MHz