Texas Instruments GC5325 User Manual
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Texas Instruments GC5325 User Manual

Texas Instruments GC5325 User Manual

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This document outlines the basic steps and functions that are required to ensure the proper operation of
the GC5325 System Evaluation Kit (SEK) system. The GC5325 is a fully integrated crest-factor reduction
(CFR), digital predistortion (DPD) device capable of linearizing a typical base-station power amplifier (PA).
This guide can help users to quickly evaluate the performance of various PAs with varying system
parameters, such as CFR levels and PA input/output power levels before and after the DPD. The GC5325
EVM has two GC5325 devices configured to provide two separate transmit paths and uses one ADC for
feedback that is shared by both GC5325 parts. The block diagram for the GC5325SEK is shown
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SLWU063F - April 2009 - Revised April 2011
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Copyright © 2009-2011, Texas Instruments Incorporated
SLWU063F - April 2009 - Revised April 2011
GC5325 System Evaluation Kit
Contents
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List of Figures
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User's Guide
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GC5325 System Evaluation Kit
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Summary of Contents for Texas Instruments GC5325

  • Page 1: Table Of Contents

    This guide can help users to quickly evaluate the performance of various PAs with varying system parameters, such as CFR levels and PA input/output power levels before and after the DPD. The GC5325 EVM has two GC5325 devices configured to provide two separate transmit paths and uses one ADC for feedback that is shared by both GC5325 parts.
  • Page 2 ....................CDCM7005 Status LEDs ..............TSW3100 LED Status With Test Pattern Running ......................Ping Test Result ............Loopback Results Using GC5325 Internal Capture Buffers ................. DPD Results From Internal PA for Channel 0 ......................DSP Busy Warning ........................ TXEQ Panel ....................

  • Page 3: Overview

    The digital portion of the GC5325EVM consist of two GC5325s which are used to generate the DPD corrected data for two duplicate transmit paths. The control of the GC5325's is provided by a TMS320C6727 Digital Signal Processor (DSP). The GC5325EVM communicates to a host PC via a DSP-Weuffen USB-to-UHPI interface board.
  • Page 4 GC5325EVM, which is derived from the YOA and YOB output of the CDCM7005 through the FPGA (dividing by 3). The frequency on GC5325 J2 must be the VCXO frequency divided by 6. With the 737.28-MHz VCXO, this output is 122.88 MHZ. Install the provided SMA coaxial cable between these connectors.

  • Page 5: Location Of Local Oscillator Inputs

    JP6 and JP9 provide power or not to the mixers. Figure 3, which is the actual silkscreen that is labeled on the top right side of the GC5325 EVM, shows how to set these jumpers per the desired mode of operation. Figure 3. Mixer Jumper Definition •...

  • Page 6: Power-Up Sequence

    PA output and GC5325 receive input signals. A typical configuration using two Mini-Circuit amplifiers, two RF couplers and the GC5325 EVM is shown in Figure F in the GC5325SEK Figures file on the provided CD.

  • Page 7: Software Installation

    (CD). The following steps outline this installation: 1. Create the following directory: C:\GC5325. Copy the \GC5325EVMGUI_xpxxx (where xpxxx is the GUI version) directory from the provided CD into C:\GC5325\ 2. Go to the C:\GC5325\GC5325EVMGUI_xpxxx \ directory, and click on MCRInstaller.exe and install the MATLAB runtime library.

  • Page 8: Using The Software

    If the default location was used, the software is now loaded under the directory called "C:\GC5325GUI". Go to this folder and double click on the file called GC5325EVM.exe to start the GC5325 GUI. The program usually takes about 15 seconds to start. Both a DOS window and a GUI appear. The DOS window displays useful text during operation of the GUI, equivalent to the MATLAB Command window for the uncompiled GUI.

  • Page 9: Gui At Start-Up

    Figure 5. GUI at Start-Up To load the DSP code through the USB-to-UHPI adapter, do the following steps: 1. In the GC5325 Registers box of the GUI, enter "5325internal" inside the ADDR box, then click on the "WR" button. 2. Select "UHPI BOOT" located in the upper right side of the GUI.

  • Page 10: Signal Levels In The Gc5325 - Definition Of Hr And Par

    (737.28 divided by 12) is used. The GC5325EVM GUI fractionally resamples the signal to match the GC5325 complex input rate of the EVM Clock divided by 12 (the interface uses an interleaved format for I and Q, so the actual data transfer rate is 2x).

  • Page 11: Matlab Vector Saved As .Mat File

    Figure 8. MATLAB Vector Saved as .mat File Next, the Import Wizard properly delimits the input file and loads the signal. Click on Finish (Figure SLWU063F – April 2009 – Revised April 2011 GC5325 System Evaluation Kit Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated...

  • Page 12: Import Wizard Screen

    10), ABS time series (Figure 11) and CCDF (Figure 12) of the resampled signal: Figure 10. Spectrum Figure 11. ABS Time Series SLWU063F – April 2009 – Revised April 2011 GC5325 System Evaluation Kit Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated...
  • Page 13 The ABS time series plot also denotes the location of the sync A input signal (red upside down triangle) used by the GC5325 to capture data for DPD. A suitable time is found by the GC5325EVMGUI automatically and must be located in a region with active data (not during the zero time).
  • Page 14 Doing this allows examination of the out-of-band CFR noise relative to the spectral mask requirement. This does not affect any setting in the GC5325 or change the CFR filter – it only affects how the two curves are displayed on the graph.

  • Page 15: Status Led's

    Near the middle bottom of the board, the three LEDs that indicate the status of the CDCM7005 (see Figure 15) should now all be illuminated. Figure 15. CDCM7005 Status LEDs SLWU063F – April 2009 – Revised April 2011 GC5325 System Evaluation Kit Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated...

  • Page 16: Tsw3100 Led Status With Test Pattern Running

    GC5322EVM. The LEDs that are illuminated are shown in Figure Figure 16. TSW3100 LED Status With Test Pattern Running SLWU063F – April 2009 – Revised April 2011 GC5325 System Evaluation Kit Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated...

  • Page 17: Ping Test Result

    NOTE: If there is an error with the data transfer across the USB-to-UHPI interface, an error message appears in the DOS window, and the GUI is disabled. If this occurs, the user must close the GUI, reset the DSP by pressing SW3 on the GC5325 EVM, and then re-open the GUI.

  • Page 18: Operating The Gc5325Sek

    1. To load the TX Channel 1 devices of the GC5325EVM, including DAC5682Z, CDCM7005, attenuators, RF switches and GC5325, go to the "device button", located in the upper left side of the GUI, and change the current value from “0” to “1”. This now allows the GUI to communicate to the Channel 1 devices.

  • Page 19: Loopback Results Using Gc5325 Internal Capture Buffers

    Using the Software www.ti.com Figure 18. Loopback Results Using GC5325 Internal Capture Buffers To view the DPD input, FB input, or Error capture buffers, the external plots check box needs to be checked. This opens the plots in separate windows. This is also useful if separate performance plots are needed for reports.
  • Page 20 DSP is probably locked, and the software must be closed, and reset the hardware by either pressing the DSP reset switch or cycling the power. SLWU063F – April 2009 – Revised April 2011 GC5325 System Evaluation Kit Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated...

  • Page 21: Other Functions

    Target Config - This window Indicates which target configuration (TGTCFG) file will be loaded into the GC5325. This window allows the user to load one of two predefined TGTCFG files (11bit or 14bit version) or custom version by selecting one of the files from the pulldown arrow on the Target Config window This window is only active if the expert mode is selected and the TgtCfg Flash box is deselected.

  • Page 22: Device

    Other Functions www.ti.com Device Selects the TX channel (0 or 1) devices that the GUI is communicating with on the GC5325 EVM. This includes the GC5325, DAC5682Z, and attenuator. Port Do not use. GC5325 Registers The GC5325 Registers window (see...

  • Page 23: Cfr Setup Window

    TDD% - This is the percent ON of the TDD input baseband signal. This must be specified before loading the test signal. SLWU063F – April 2009 – Revised April 2011 GC5325 System Evaluation Kit Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated...

  • Page 24: Dpd Cfr Configuration Window

    Load Signal - This button loads the composite input signal into the GUI for processing. This will cause the signal to be rescaled if needed based on the VCXO and sample rate SLWU063F – April 2009 – Revised April 2011 GC5325 System Evaluation Kit Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated...

  • Page 25: Rf Card

    Divider Ratios - This is the divide value used by each of the CDCM7005 outputs. The first number is the divide ratio for the FPGA clock, the second the DAC clocks, the third GC5325 DPD clocks, the fourth is connector J49, and the last the ADC clock.

  • Page 26: Dpd Operation

    Operation window. The DPD Control widow will open as shown in Figure 27. Use the pull down menus to set the values and click on the Set button SLWU063F – April 2009 – Revised April 2011 GC5325 System Evaluation Kit Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated...

  • Page 27: 5.10 Capture Buffers

    The Capture Buffers window allows the user to capture 4K of data from different points of processing within the GC5325. The GC5325 contains two 4K capture buffers which will store the data that is selected by the user. The Capture Buffers are the 4 plots located on the right side of the GUI. The top two displays (time and frequency) use data from one capture buffer and the bottom two displays use data from the other buffer.

  • Page 28: 5.11 Quit And Command/Message Window

    Additional functions may be required, and the users are encouraged to request these from Texas Instruments through their local support group. This guide does not support custom DUC, CFR, or DPD settings, although this is possible.

  • Page 29: Appendix Aleds, Switches, Connectors, And Jumpers

    Baseband connector for GC5325 Connect to GC5325 EVM J1 Baseband connector for GC5325 Connect to GC5325 EVM J3 CMOS baseband CLK input from GC5325 Connect to GC5325 SMA J2 Ethernet connection to PC for pattern load Connect to Host PC via...
  • Page 30 D10 – On after both GC5325 devices are configured. D11 – Blinking after DSP is up and running. D12 – On (Red) when GC5325 device 0 fails to configure properly. D13 – On (Red) when GC5325 device 1 fails to configure properly.

  • Page 31: Gc5325Evm Jumper And Descriptions

    FPGA test connector J25, J26 External UHPI interface connectors DSP JTAG connector RS-232 connector J1, J2 Baseband input from TSW3100 SLWU063F – April 2009 – Revised April 2011 LEDs, Switches, Connectors, and Jumpers Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated...

  • Page 32: Gc5325Evm Connector Description

    CW can be injected into the J30 MCX connector as the external clock. The CDCM7005 in this case only acts as a buffer and clock divider. SLWU063F – April 2009 – Revised April 2011 LEDs, Switches, Connectors, and Jumpers Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated...
  • Page 33 Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
  • Page 34 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
  • Page 35 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments GC5325SEK...

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