Table Of Content

Design Guidelines/Training Slides WTR4905/WTR4605 RF Transceiver 80-NL713-5 Rev. B Confidential and Proprietary – Qualcomm Technologies, Inc. Restricted Distribution: Not to be distributed to anyone who is not an employee of either Qualcomm or its subsidiaries without the express approval of Qualcomm’s Configuration Management. Confidential and Proprietary – Qualcomm Technologies, Inc. NO PUBLIC DISCLOSURE PERMITTED: Please report postings of this document on public servers or websites to: [email protected]. Restricted Distribution: Not to be distributed to anyone who is not an employee of either Qualcomm or its subsidiaries without the express approval of Qualcomm’s Configuration Management. Not to be used, copied, reproduced, or modified in whole or in part, nor its contents revealed in any manner to others without the express written permission of Qualcomm Technologies, Inc. Qualcomm is a trademark of Qualcomm Technologies, Inc., registered in the United States and other countries. Qualcomm RF360 is a trademark of QUALCOMM Incorporated. All QUALCOMM Incorporated trademarks are used with permission. Other product and brand names may be trademarks or registered trademarks of their respective owners. This technical data may be subject to U.S. and international export, re-export, or transfer (“export”) laws. Diversion contrary to U.S. and international law is strictly prohibited. Qualcomm Technologies, Inc. 5775 Morehouse Drive San Diego, CA 92121 U.S.A. © 2014 Qualcomm Technologies, Inc. Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NL713-5 Rev. B 2 Revision History Revision Date Description A April 2014 Initial release B May 2014 Slide 7, 13, and 21: Removed DOrB support Slide 10, 11, 23, and 66: Changed WTR4605 DNC’ed Tx port from TX_DA5 to TX_DA3 Slide 16: Corrected document reference Slides 18, 30, and 121: Added B44 Slides 36 and 98: Added detail keep-out dimensions Slide 21 and 25: Removed TBD column Slide 26: Added reference document number for MSM8x36/MSM8x39+PM8916 Baseband Reference Schematic and updated the table Slide 30: Removed Airlink support row Slides 32–33: Updated matching network Slide 43–46: Removed port mapping rules and added reference design port mapping tables Slides 52–53: Updated Japan and NA2 CSFB block diagram Slide 64: Changed recommended XO_IN series cap from 1000 pF to 100 pF; removed TX_FBRX input guidance Slide 66: Removed “Power reduction features via modem IC control” Slide 67: Tied unused TX_DAC1 I/Q lines to ground Slide 75: Removed Channel 3 Rx BB IQ lines from MSM8916/MSM8936 Slide 77: Added slide for unused analog baseband ports guidance Slides 78–79: Updated matching network Slide 88: Added high rejection filter reference part number for GNSS/GPS Slides 89–91: Added section 4.1.3, GSM SAW-less Design Overview Slides 92–95: Added section 4.1.4, Tx Feedback Receiver Overview Slide 102: Updated block diagram Slide 108: Updated block diagram Slide 112: Updated RFFE guidelines and the block diagram Slide 122: Added PA thermistor guidance Slide 128: Added reference document MSM/MDM Key RF External Components Recommendations Slides 129-130: Added Section 4.2.2, Tx Feedback Receiver Design Considerations Slide 132: Added design considerations for B28A or B28B only Removed Section 5 and relocated Japan design example to Section 4.1 Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NL713-5 Rev. B 3 Contents 1 Introduction 5 1.1 WTR Devices Overview 6 1.2 WTR4x05 Introduction 9 1.3 WTR Device Variants 20 1.4 Chipset Support & Reference Designs 24 1.5 QTI Support for WTR Devices 27 2 Migration from WTR1605L to WTR4905 29 3 WTR Related System-level Topics 40 3.1 Software Defined RF Port Assignments 42 3.2 Supported Dual-Tx RF Techniques 47 3.3 Example Applications 51 4 General Design Guidelines 61 4.1 WTR-specific General Design Guidelines 62 4.1.1 WTR Transmitters 65 4.1.2 WTR Receivers 71 4.1.3 GSM SAW-less Overview 89 4.1.4 Tx Feedback Receiver Overview 92 4.1.5 PCB Keep-out Areas 96 4.1.6 WTR DC Power 99 4.1.7 WTR Ground Connections 104 4.1.8 WTR Support Circuits 107 4.1.9 RF Layout Techniques (General) 113 4.2 RF Front-end Guidance 117 4.2.1 General Design Considerations 118 4.2.2 Tx Feedback Receiver Design Considerations 129 4.2.3 B41 Design Considerations 131 4.2.4 B28 Design Considerations 133 Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NL713-5 Rev. B 4 Sec. 1 1.1 WTR Devices Overview 6 1.2 WTR4x05 Introduction 9 Introduction 1.3 WTR Device Variants 20 1.4 Chipset Support & Reference Designs 24 1.5 QTI Support for WTR Devices 27 Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NL713-5 Rev. B 5 Sec. 1.1 WTR Devices Overview Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NL713-5 Rev. B 6 WTR Devices Overview The QFExxxx PA power management IC is a key component within the Qualcomm RF360™ front-end  solution. Qualcomm RF360 is a multimode, multiband front-end that includes power amplifier, PA power tracking, antenna switch, and antenna tuner ICs – the first truly global RF solution for LTE products. The superset device in this multimode, multiband RF transceiver family is the WTR4905 device.  One other subset variant is also available at this time.  A high-level comparison of the available variants:  The WTR4605 device supports 3GPP2 CDMA 1x to DOrA, 3GPP WCDMA Rel 99 to DC-HSPA+, 3GPP GSM to EDGE, and  TD-SCDMA The WTR4905 device supports all airlinks supported by the WTR4605 device, plus 3GPP LTE FDD and TDD  Additional details regarding the differences are presented later, after the devices are introduced.  Throughout this document, the devices are referred to as the WTR4x05 device when material being  presented applies to both of them. Sec. 1.1 Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NL713-5 Rev. B 7 RF Front-end Using the WTR4905 Device Major WTR4x05 device functions RF transmitters  RF receivers  Supports circuits  LOs, digital I/Os, etc.  RF DC transmitters Power management Tx Clks ANT_0 E Qualcomm front-end Support F Tx FBRx F (QFE) components circuits R HB PRx c QFE2520 pri antenna tuner TX_0 baseband i f MB PRx i c QFE2550 sec antenna tuner RX_0 baseband e ANT_N p LB PRx s QFE3320 L/MB PA & switches RX_1 baseband n- HB DRx C o QFE2320 L/MB PA & switches GNSS baseband I RF ti MB DRx m a QFE2340 HB PA & switches receivers e c d GNSS pli QFE2101 PA power tracking LB DRx TX_1 baseband Mo p GNSS A and other components RX_2 baseband as needed Advanced techniques RFFE WTR4905 WTR2100 Add for advanced RF techniques … or … – SGLTE, DSDA, SVLTE, etc WTR2605 Sec. 1.1 Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NL713-5 Rev. B 8 Sec. 1.2 WTR4x05 Introduction Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NL713-5 Rev. B 9 WTR4x05 Introduction – Block Diagram WTR4905 WTR4605 Low band Tx path TX_BB_IP Wideband Tx RF outputs TX_DA5 TX_DA5  TX_BB_IM T quadrature upconverter TX_BB_QP  Single Tx analog baseband input (diff I/Q pair) TX_DA4 TX_DA4 tx_lo TX_BB_QM Mid/high band Tx path Single wideband Tx RF feedback input  TX_DA3 DNC Support VDD_ LDO & RF2_LDO circuits RF bias ckts Band-specific, single-ended PRx RF inputs  TX_DA2 TX_DA2 transmitters Tx LO tx_lo circuits txfb_lo  Single PRx analog baseband outputs GSM Tx GP_DATA TX_DA1 TX_DA1 f_ref phs adj WTR4905 / WTR4605 (I/Q pair, single-ended) MIPI_RFFE RFFE_CLK RFFE_DATA SAWless quad stat & ctl  Single DRx analog baseband outputs LN tank downconverter ef Clock XO_IN (I/Q pair, single-ended) PRX_LB3 PRX_LB3 LN grx_lb_lo Cacliirbcruaittison f_r circuits VDDs PRX_LB2 PRX_LB2 LN tank P quadrature gnss_lo GcNirScSui tLsO f_ref downconverter  GNSS RF input PRX_LB1 DNC LN prx_lb_lo prpxr_xm_lbb__lloo Rx LO GNDs prx_hb_lo circuits f_ref Single GNSS analog baseband output PRX_HB2 DNC LN P quadrature grx_lb_lo  (I/Q pair, single-ended) PPRRXX__MHBB13 PRDXN_MCB3 LN LN tank prx_dhob_wlonconverter gdrrdxxr__xmm_lbbb___lllooo txtIxsnfbfitbge__nrbnbabablqsli ADCs PDET & CAL P quadrature drx_hb_lo PRX_MB2 PRX_MB2 LN tank Simple digital interface with the modem IC; downconverter  PRX_MB1 PRX_MB1 LN prx_mb_lo PRX_BBI industry standard MIPI_RFFE SAWless quad LN tank PRX_BBQ downconverter Integrated frequency synthesizers support  grx_mb_lo DRX_LB3 DRX_LB3 LN DRX_BBI all Rx and Tx operating bands DRX_LB2 DRX_LB2 LN tank D quadrature downconverter DRX_LB1 DNC LN DRX_BBQ drx_lb_lo Uses the system-wide 19.2 MHz clock  DRX_HB2 DNC LN D quadrature tank (XO signal generated by PMIC) DRX_HB1 DNC LN downconverter RF drx_hb_lo receivers DRX_MB2 DRX_MB2 LN D quadrature DRX_MB1 DRX_MB1 LN tank downconverter drx_mb_lo quadrature txfb_bbi TX_FBRX TX_FBRX LN downconverter txfb_lo txfb_bbq gnss_lo GNSS_BBI G quadrature GNSS_IN GNSS_IN LN GNSS_BBQ downconverter Sec. 1.2 Confidential and Proprietary – Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NL713-5 Rev. B 10