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UHD - USRP-B2x0 Series Device Manual
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.. contents:: Table of Contents
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Comparative features list - B200
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**Hardware Capabilities:**
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* Integrated RF frontend (70 MHz - 6 GHz)
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* External PPS reference input
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* External 10 MHz reference input
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* Configurable clock rate
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* Internal GPSDO option
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* MICTOR Debug Connector
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**FPGA Capabilities:**
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* Timed commands in FPGA
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* Timed sampling in FPGA
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Specify a Non-standard Image
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UHD software will automatically select the USRP B2X0 images from the installed images package.
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The image selection can be overridden with the **fpga** and **fw** device address parameters.
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Example device address string representations to specify non-standard images:
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fpga=usrp_b200_fpga.bin
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Changing the Master Clock Rate
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The master clock rate feeds the RF frontends and the DSP chains.
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Users may select non-default clock rates to acheive integer decimations or interpolations in the DSP chains.
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The default master clock rate defaults to 32 MHz, but can be set to any rate between 5 MHz and 61.44 MHz.
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The user can set the master clock rate through the usrp API call set_master_clock_rate(),
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or the clock rate can be set through the device arguments, which many applications take:
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uhd_usrp_probe --args="master_clock_rate=52e6"
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The B200 features and integrated RF frontend.
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The RF frontend has individually tunable receive and transmit chains.
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On the B200, there is one transmit and one receive RF frontend.
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On the B210, both transmit and receive can be used in a MIMO configuration.
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For the MIMO case, both receive frontends share the RX LO,
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and both transmit frontends share the TX LO.
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Each LO is tunable between 50 MHz and 6 GHz.
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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All frontends have individual analog gain controls.
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The receive frontends have 73 dB of available gain;
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and the transmit frontends have 89.5 dB of available gain.
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Gain settings are application specific,
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but it is recommended that users consider using at least
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half of the available gain to get reasonable dynamic range.