From Ettus Knowledge Base
Jump to: navigation, search

Device Overview

The WBX is a wide bandwidth transceiver that provides up to 100 mW of output power and a noise figure of 5 dB. The LO's for the receive and transmit chains operate independently. The WBX daughterboard is supported by the USRP Hardware Driver™ (UHD) software API for seamless integration into existing applications.

The WBX provides phase coherent operation, although with a 180-degree ambiguity, which must be calibrated out in the application. For phase-coherent applications, Ettus Research recommends the SBX with the N200/N210 or the SBX or UBX with the X300/X310.

Key Features

  • Frequency Range: 50MHz - 2.2GHz
  • Versions: 40MHz / 120MHz
  • Power Output: 100mW
  • Noise Figure: 5dB
Product wbx 40.jpg
Product wbx 120.jpg

Daughterboard Specifications


  • 2 quadrature frontends (1 transmit, 1 receive)
    • Defaults to direct conversion
    • Can be used in low IF mode through lo_offset with uhd::tune_request_t
  • Independent receive and transmit LO's and synthesizers
    • Allows for full-duplex operation on different transmit and receive frequencies
    • Can be set to use Integer-N tuning for better spur performance with uhd::tune_request_t


Transmit: TX/RX

Receive: TX/RX or RX2

  • Frontend 0: Complex baseband signal for selected antenna
  • Note: The user may set the receive antenna to be TX/RX or RX2. However, when using a WBX board in full-duplex mode, the receive antenna will always be set to RX2, regardless of the settings.


  • Transmit Gains: PGA0, Range: 0-31.5dB
  • Receive Gains: PGA0, Range: 0-31.5dB


  • WBX: 40 MHz, RX & TX
  • WBX-120: 120 MHz, RX & TX


  • lo_locked: boolean for LO lock state

RF Specifications

Freq Range

  • 50MHz - 2.2GHz

Noise Figure

  • 2 - 4 dB @ (50MHz ~ 1.2GHz)
  • 4 - 8 dB @ (1.2GHz ~ 2.2GHz)

RX IIP3 (Max)

  • 10 - 18 dBm

RX IQ Imbalance

  • -30 dBc

TX Power (Max)

  • 18 - 20 dBm @ (50MHz ~ 1.4 GHz)
  • 12 - 18dBm @ (1.4GHz ~ 2.2 GHz)


  • 30 - 32 dBm @ (50MHz ~ 800MHz)
  • 25 - 30 dBm @ (800MHz ~ 2.2GHz)

TX IQ Imbalance

  • -30 dBc @ (50MHz ~ 1.9GHz)
  • - 24 dBc @ (1.9GHz ~ 2.2GHz)

Input/Output Impedance

  • All RF Ports are matched to 50 Ohm with -10dB or better return loss generally. Detailed test is pending.

Input Power Levels

  • The maximum input power for the WBX is -15 dBm.

RF Performance Data

Hardware Specifications

  • Ettus Research recommends to always use the latest stable version of UHD


  • Current Hardware Revision: 1
  • Minimum version of UHD required: 3.8.0


  • Current Hardware Revision: 1
  • Minimum version of UHD required: 3.8.0

Environmental Specifications

Operating Temperature Range

  • 0-40 °C

Operating Humidity Range

  • 10% to 90% non-condensing

USRP Compatibility


  • N or X Series


  • X Series only

Phase Synchronization

The WBX daughterboard is capable of phase-synchronous operation, but with a with a 180-degree ambiguity, which must be calibrated out in the user application. The SBX, UBX, TwinRX daughterboards are recommended for phase-coherent applications.



WBX Schematics

WBX FE Schematics

Key Component Datasheets

Part Number Description Schematic ID (Page)
ADA4937 Ultralow Distortion Differential ADC Driver U304 (2)
ADP3336 High Accuracy Ultralow IQ, 500 mA anyCAP® Adjustable Low Dropout Regulator U306, U308 (2); U503, U505 (4)
ADL5387 50 MHz to 2 GHz Quadrature Demodulator U307 (2)
ADL5385 50 MHz to 2200 MHz Quadrature Modulator U501 (4,5)
ADF4350 / ADF4351 Wideband Synthesizer with Integrated VCO U201 (3); U401 (5)
HMC472LP4 Attenuator U302 (2); U504 (4,5)
MGA82563 Amplifier U313 (2)
24LC024 EEPROM U202 (3); U403 (5)
GVA−84+ Amplifier U502 (4)

Mechanical Information


RF Connectors

  • The WBX daughterboard features female MCX connectors for both the TX/RX and RX2 connectors.



As of December 1st, 2010 all Ettus Research products are RoHS compliant unless otherwise noted. More information can be found at http://ettus.com/legal/rohs-information

China RoHS

Management Methods for Controlling Pollution Caused by Electronic Information Products Regulation

Chinese Customers

National Instruments is in compliance with the Chinese policy on the Restriction of Hazardous Substances (RoHS) used in Electronic Information Products. For more information about the National Instruments China RoHS compliance, visit ni.com/environment/rohs_china.

Certificate of Volatility



FPGA Resources

UHD Stable Binaries

UHD Source Code on Github