SBX

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

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)

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

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

File:cu ettus-cca-sbx.pdf

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

Certificate of Volatility

SBX-40/SBX-120

Media:volatility UBX CBX WBX SBX r1 1.pdf

RF Performance Data

SBX without UHD Corrections

Downloads

FPGA Resources

UHD Stable Binaries

UHD Source Code on Github

SBX

Contents