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CN0534 Evaluation Board Guide

Overview

The International Telecommunication Union (ITU) allocates the unlicensed 5.8 GHz industrial, scientific, and medical (ISM) radio frequency band for use worldwide. Advancements in wireless technologies and standards, as well as minimal regulatory compliance requirements, have made this frequency band popular for short range, wireless communication systems.

The 5.8GHz band is preferred for short-range digital communication applications (such as WiFi) because of the number of channels and the bandwidth available. While the transmission range is shorter than that of the 2.4GHz band, its 150MHz bandwidth accommodates up to 23 non-overlapping WiFi channels. Additional common uses include software defined radio, wireless access points, public safety radio, wireless repeaters, femtocells, and LTE/WiMAX/4G, BTS infrastructure.

This design provides a high gain, robust overpower monitoring, and protection all in a small footprint, a great addition to any ISM band application where low signal strength or distance may be a complication. The circuit shown in the figure below is a high performance RF receiver system with 10dB of gain, optimized for operation at a center frequency of 5.8GHz. By keeping the input unfiltered and using a filter to attenuates out-of-band interferers at the amplifier output, the entire system noise figure performance is at 2dB. The circuit includes a high speed overpower cutoff that protects sensitive downstream equipment connected to the receiver system. The receiver system also automatically turns back on when once the RF power input is now within the acceptable range.

The RF inputs and outputs are standard SMA connectors, and the entire design is powered from a single micro USB connector.

General Setup

LED, DS1 from CN0534, will automatically turn on indicating that the CN0534 is powered and operational. If the LED is off, the CN0534 could still be powered properly, but the RF input power into the amplifier might be activating the automatic shutdown, so try to lower the RF input signal by 10dB and see if the LED turns on.

Connectors

SMA Connectors

The SMA connectors are used for the RF input and output connections.

  • J1 is the RF OUTPUT SMA Female connector that would normally be connected to a radio or piece of RF equipment.
  • J2 is the RF INPUT SMA Male connector that would normally be connected to an antenna.

Power Connector

  • P1 is the micro USB port used to provide 5V power to the board

Getting Started

Required Equipment

  • Two (2) micro-USB power adaptors OR Two (2) micro-USB to USB cables for powering up ADALM-Pluto and EVAL- CN0534-EBZ
  • One (1) SMA male to SMA male cable
  • One (1) SMA 10dB RF Attenuator (6610_SMA-50-2/199_NE) OR any equivalent RF Attenuator with same attenuation or higher

ADALM-Pluto Preparation

Firmware Loading

  1. Unzip downloaded folder.
  2. Connect Pluto to PC/Laptop using micro USB cable in the terminal with USB symbol.
  3. Open the Pluto mass storage device.
  4. Open the downloaded firmware file.
  5. Copy the file, pluto.frm, to the Pluto mass storage device
  6. This will cause LED1 to blink rapidly. This means programming is taking place. Do not remove power (or USB) while the device is blinking rapidly. It does take approximately 4 minutes to properly program the device.
  7. Once the device is done programming, it will re-appear as a mass storage device.
  8. Eject (don't unplug) the Pluto mass storage device.
  9. Now the usb cable can now be safely disconnect in PC.

Updating to the AD9364

  1. Connect again the Pluto to PC/Laptop using micro USB cable.
  2. Open any serial application (ex. TeraTerm, Putty) and ssh to 192.168.2.1, username is root and the password is analog.
  3. To change things to the AD9364 configuration, type in the following commands, line by line:
    # fw_setenv attr_name compatible
    # fw_setenv attr_val ad9364
    # reboot

  4. Eject (don't unplug) the Pluto mass storage device.
  5. Now the usb cable can now be safely disconnect in PC.
  6. Connect again Pluto to PC/Laptop using micro USB cable and proceed setting up the hardware test setup following the instruction in the next section.

Test Setup

Normal Operation

  1. Connect the RF TX of Pluto SDR to J2 of the EVAL-CN0534-EBZ Board
  2. Connect J1 of the EVAL-CN0534-EBZ Board to the RF RX of Pluto SDR
  3. Connect P1 (micro USB) connector of the EVAL-CN0534-EBZ Board into a PC USB port or 5V USB charger.
  4. The DS1 LED of CN0534 will automatically turn on indicating the board is powered on and is in operation.
The ADALM-Pluto can be configured using an IIO Oscilloscope, visit the website on
  • IIO Oscilloscope to know more about the tool.
  • Optional: an RF attenuator can be connected in between the EVAL-CN0534-EBZ Board RF Output and the RF RX of Pluto SDR to protect the RX of Pluto from exceeding its limits.

IIO Oscilloscope

Make sure to download/update to the latest version of IIO-Oscilloscope found on this linkhttps://github.com/analogdevicesinc/iio-oscilloscope/releases
  1. Once done with the installation or an update of the latest IIO-Oscilloscope, open the application. The user needs to supply a URI which will be used in the context creation of the IIO Oscilloscope and the instructions can be seen from the previous section.
  2. Press refresh to display available IIO Devices, once ADALM-Pluto appeared, press connect.

ADALM Pluto Loop-Back Operation

The plot shown below is the ADALM Pluto output with the RF TX and RX connected directly with transmit power set to -30 dBFS producing a 63.5 dB RSSI RF power input reading:

And with transmit power set to -10 dBFS producing a 43.5 dB RSSI RF power input reading:

Normal Operation

The plot is as shown below with transmit power set to -30 dBFS producing a 41.5 dB RSSI RF power input reading providing a gain of 22dB in reference with the loop back test operation:

Auto Shutdown Operation

The plot is as shown below with transmit power set to -10 dBFS producing a 40.25 dB RSSI RF power input reading and showing a 20 dB attenuation in reference with the loop back test operation:


WARNING

Connecting the EVAL-CN0534-EBZ Board directly to the input (Rx) of a radio or other piece of RF equipment may exceed the absolute maximum ratings for the RF Input. (which is +2.5 dBm for the ADALM-PLUTO). Doing this may permanently damage the input.

Never do this in normal operation.

Schematic, PCB Layout, Bill of Materials

EVAL-CN0534-SDPZ Design & Integration Files

  • Schematics
  • PCB Layout
  • Bill of Materials
  • Gerber Files
  • Allegro Board File

End of Document

resources/eval/user-guides/circuits-from-the-lab/cn0534.1635316914.txt.gz · Last modified: 27 Oct 2021 08:41 by erbe reyta