SBX
Contents
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
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Daughterboard Properties
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: 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
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
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) |
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
