CBX
From Ettus Knowledge Base
Contents
Device Overview
The CBX is a full-duplex, wideband transceiver that covers a frequency band from 1.2 GHz to 6 GHz with a instantaneous bandwidth of 40 MHz or 120 MHz. The CBX can serve a wide variety of application areas, including WiFi research, cellular base stations, cognitive radio research, and RADAR.
The CBX does not provided phase coherent operation, and therefore is not recommended 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: 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 CBX 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
- CBX: 40 MHz, RX & TX
- CBX-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
CBX
- 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
CBX-40
- N or X Series
CBX-120
- X Series only
Schematics
CBX
Key Component Datasheets
| Part Number | Description | Schematic ID (Page) |
|---|---|---|
| VMMK-3603 | Low Noise Amplifier | U1, U5 (1) |
| AS225-313LF | SPDT Switch | U3, U6 (1) |
| HMC624LP4E | ATTENUATOR | U7, U2 (1) |
| MGA82563 | Amplifier | U4 (1) |
| GVA-84+ | Amplifier | U9 (1) |
| PHA-1+ | Amplifier | U8 (1) |
| ADL5380ACPZ | Quadrature Demodulator | U11 (2) |
| ADA4927-2YCPZ | Differential ADC Driver | U10 (2) |
| AD8591ARTZ-REEL | Amplifiers | U31 (2) |
| NC7WZ04P6X | Dual Inverter | U26 (3); U15, U16 (4); U21 (5); U27 (6) |
| MAX2870ETJ+ | Fractional/Integer-N Synthesizer | U23 (3); U24 (6) |
| SKY13267-321 | Diversity Switch | U12 (3); U25 (6) |
| LFCN-2000+ | Low Pass Filter | FL13 (3); FL12 (6) |
| LP3878MR-ADJ | Voltage Regulator | U13, U14 (4); U19, U20 (5) |
| 24LC024 | EEPROM | U17 (4); U22 (5) |
| ADL5375-05 | Quadrature Modulator | U18 (5) |
RF Connectors
- The CBX 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
