225MHz - 3800MHz RF power amplifier lineariser

July 28, 2014 // By Graham Prophet
Maxim Integrated has posted details of the SC1894, a CMOS chip that provides third-generation, fully adaptive RF PA linearisation technology in a single IC.

As the 3rd generation of RF PA linearisers (RFPALs), this devices provides improved correction and functionality over the previous generations. The SC1894 is a fully adaptive, RFin/RFout predistortion linearisation solution optimised for a wide range of amplifiers, power levels, and communication protocols. The SC1894 uses PA output and input signals to adaptively generate an optimised correction function in order to minimise the PA's self-generated distortion and impairments. Using RF-domain analogue signal processing enables the SC1894 to operate over wide-signal bandwidths and consume very low power.

The SC1894 goes beyond linearisation and provides accurate RF power measurement of RFIN and RFFB. Advanced features including spectral monitoring and ACLR alarm are also available. These optional features are accessed through the SC1894’s serial peripheral interface (SPI) bus.

Features include;

Fabrication in standard CMOS

Fully adaptive correction

Up to 28 dB ACLR and 38 dB IMD improvement

External reference clock support:

10, 13, 15.36, 19.2, 20, 26, and 30.72 MHz

Low power consumption:

Duty-cycled (9%) Feedback: 600 mW

Full adaptation: 1200 mW

Frequency range: 225 MHz to 3800 MHz

Input signal bandwidth: 1.2 MHz to 75 MHz

Packaged in 9 x 9 mm QFN package

Operating case temperature: -40°C to +100°C

Backwards compatible with SC1887/69/89

Dual-RF power measurement.

Maxim Integrated; www.maximintegrated.com/en/products/comms/wireless-rf/SC1894