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F1385EVS Datasheet(PDF) 1 Page - Renesas Technology Corp |
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F1385EVS Datasheet(HTML) 1 Page - Renesas Technology Corp |
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1 / 42 page  DPD Demodulator for PA Linearization 3200 to 4400 MHz F1385 Datasheet © 2022 Renesas Electronics Corporation 1 February 7, 2022 Description This document describes the specification for the F1385 Digital Pre-Distortion Demodulator for PA linearization. This series of devices is offered in two frequency variants to cover common UTRA bands. Competitive Advantage In typical Base Station transmitters digital pre-distortion is employed to improve the transmitter performance. The signal out of the PA is sampled and the incoming TX chain I & Q data is pre- distorted to counteract the distortion inherent in the PA. The PA signal is adjusted via a digital step attenuator to a lower level and then sub-sampled at an IF frequency of ~350 MHz which necessitates the need for a highly linear demodulator to downconvert to quadrature IF from the transmit frequency. By sampling IF_I and IF_Q independently and then digitally combining these signals, an effective doubling of the sample rate can be achieved. Any distortion in this path will degrade the performance of the DPD algorithm. By utilizing an ultra-linear demodulator with integrated DSA such as the F1385, the ACLR and/or power consumption of the full TX system can be improved significantly. DPD full path ACLR: Reduced by 1 dB Icc: Typically 45% less current Zero-DistortionTM eliminates 2 IF amps Integrates 2 Baluns, SP2T RF switch Glitch-FreeTM gain control Features Wide flat performance IF BW Wide RF BW (~ 1.2 GHz) Ideal for Multi-Carrier Systems Drives ADC directly Ultra linear +39 dBm OIP3 Excellent ACLR performance 100 Ω differential output impedance Fully integrated DPD demodulator 6 x 6 mm 36-pin package Standby Mode w/Fast Recovery ICC: 210 mA Block Diagram Figure 1. Block Diagram 90 O . LO SPI DEC Bias Ctrl STBY ISET IBIAS CLK DATA CSb 2 IFI IFQ RFY RFX |
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