SBX

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Device Overview

The SBX is a wide bandwidth transceiver that provides up to 100 mW of output power, and a typical noise figure of 5 dB. The local oscillators for the receive and transmit chains operate independently, which allows dual-band operation. The SBX is MIMO capable, and provides 40 MHz or 120 MHz of bandwidth. The SBX is ideal for applications requiring access to a variety of bands in the 400 MHz-4400 MHz range. Example application areas include WiFi, WiMax, S-band transceivers and 2.4 GHz ISM band transceivers.

The SBX is capable of phase coherent operation, and therefore is suitable for MIMO and Phased Array applications.

Key Features

  • Frequency Range: 400MHz - 4.4GHz
  • Versions: 40MHz / 120MHz
  • Power Output: 100mW
Product sbx 40.jpg
Product sbx 120.jpg

Daughterboard Specifications

Features

  • 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

Antennas

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 an SBX board in full-duplex mode, the receive antenna will always be set to RX2, regardless of the settings.

Gains

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

Bandwidths

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

Sensors

  • lo_locked: boolean for LO lock state

LEDs

  • All LEDs flash when daughterboard control is initialized
  • TX LD: Transmit Synthesizer Lock Detect
  • TX/RX: Receiver on TX/RX antenna port (No TX)
  • RX LD: Receive Synthesizer Lock Detect
  • RX1/RX2: Receiver on RX2 antenna port

RF Specifications

Freq Range

  • 400MHz - 4.4GHz

Noise Figure

  • 4 - 5 dB @ (400MHz ~ 1.5GHz)
  • 5 - 7 dB @ (1.5GHz ~ 3GHz)
  • 7 - 12dB @ (3GHz ~ 4.4GHz)

RX IIP3 (Max)

  • 16 ~ 22 dBm

RX IQ Imbalance

  • -20 dBc @ (400MHz ~ 600MHz)
  • -30dBc @ (600MHz ~ 4.4GHz)

TX Power (Max)

  • 20 dBm @ (400MHz ~ 3.5GHz)
  • 18 - 20dBm @ (3.5GHz ~ 4.4GHz)

TX OIP3

  • 26 - 30dBm @ (400MHz ~ 1.5GHz)
  • 30 dBm @ (1.5GHz ~ 4.4GHz)

TX IQ Imbalance

  • -20 dBc @ (400MHz ~ 600MHz)
  • -30dBc @ (600MHz ~ 4.4GHz)

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 SBX is -15 dBm.

Hardware Specifications

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

SBX

  • Current Hardware Revision: 5.1
  • 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

SBX-40

  • N or X Series

SBX-120

  • X Series only

Phase Synchronization

The SBX daughterboard is capable of phase-synchronous operation, and is recommended for phase-coherent applications. The UBX and TwinRX daughterboards are also recommended for phase-coherent applications.

Schematics

SBX

SBX Schematics

Key Component Datasheets

Part Number Description Schematic ID (Page)
MGA82563 Amplifier U1, U5, U4 (1)
AS225-313LF SPDT Switch U3, U6 (1)
HMC624LP4E ATTENUATOR U2, U7 (1)
LFCN-5850+ Low Pass Filter FL1 (1)
PHA-1+ Amplifier U8 (1)
GVA-84+ Amplifier U9 (1)
ADL5380ACPZ Quadrature Demodulator U11 (2)
ADA4927-2YCPZ Differential ADC Driver U10 (2)
AD8591ARTZ-REEL Amplifiers U31 (2)
ADF4350BCPZ Synthesizer with Integrated VCO U23 (3); U24 (6)
SKY13267 Diversity Switch U12 (3); U25 (6)
LFCN-1200+ Low Pass Filter FL13 (3); FL12 (6)
TC1-1-43A+ RF Transformer T3 (2); T2, T5 (3); T4, T6 (6)
LP3878MR-ADJ Voltage Regulator U13, U14 (4); U19, U20 (5)
NC7WZ04P6X Dual Inverter U15, U16 (4); U21 (5); U27 (6); U26 (3)
24LC024 EEPROM U17 (4); U22 (5)
ADL5375 Quadrature Modulator U18 (5)

Drawings

RF Connectors

  • The SBX daughterboard features female SMA connectors for both the TX/RX and RX2 connectors.

Certifications

RoHS

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

SBX-40/SBX-120

RF Performance Data

Downloads

FPGA Resources

UHD Stable Binaries

UHD Source Code on Github