USRP-2921 Block Diagram

NI-USRP Help

Edition Date: March 2018

Part Number: 373380J-01

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The following figure shows a simplified block diagram of the USRP-2921.

2921 block diagram

The following lists describe the individual blocks:

Note Note  The RF switch allows transmit and receive operations to occur on the same shared antenna.
Note Note  You cannot perform Tx and Rx operations simultaneously because the board is half-duplex.

Receive Path:

  • The low-noise amplifier and drive amplifier amplify the incoming signal.
  • The phase-locked loop (PLL) controls the voltage-controlled oscillator (VCO) so that the device clocks and local oscillator (LO) can be frequency-locked to a reference signal.
  • The mixer downconverts the signals to the baseband in-phase (I) and quadrature-phase (Q) components.
  • The user-selectable lowpass filter reduces noise and high frequency components in the signal. The following filters are available:
    • 15 MHz
    • 19 MHz
    • 28 MHz
    • 36 MHz
  • The analog-to-digital converter (ADC) digitizes the I and Q data.
  • The digital downconverter (DDC) mixes, filters, and decimates the signal to a user-specified rate.
  • The downconverted samples are passed to the host computer over a standard gigabit Ethernet connection.

Transmit Path:

  • The host computer synthesizes baseband I/Q signals and transmits the signals to the device over a standard gigabit Ethernet connection.
  • The digital upconverter (DUC) mixes, filters, and interpolates the signal to 400 MS/s.
  • The digital-to-analog converter (DAC) converts the signal to analog.
  • The user-selectable lowpass filter reduces noise and high frequency components in the signal. The following filters are available:
    • 24 MHz
    • 36 MHz
    • 48 MHz
  • The mixer upconverts the signals to a user-specified RF frequency.
  • The PLL controls the VCO so that the device clocks and LO can be frequency-locked to a reference signal.
  • The transmit amplifier amplifies the signal, which is then transmitted through the antenna.

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