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.
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