PXIe-5665 Signal Path

An RF source signal takes the following paths from the PXIe-5665 front panel to the PXI Express controller, depending on your PXIe-5665 configuration and operating frequency range.

(3.6 GHz or 14 GHz) for Frequencies ≤ 3.6 GHz

  1. The RF source signal enters the PXIe-5603 or PXIe-5605 front panel at the RF IN connector.
  2. If you purchased the PXIe-5603 or PXIe-5605 with the optional preamplifier and have enabled the preamplifier, the signal source can be amplified, which can improve the noise figure.
  3. The PXIe-5603 and PXIe-5605 downconverters tune the signal to a center frequency and frequency-translate it to center around either 187.5 MHz, 190 MHz (PXIe-5605 only), or 199 MHz.
  4. The frequency-translated signal is filtered by the IF filter.
  5. The filtered signal passes from the RF downconverter module front panel IF OUT connector to the PXIe-5622 IF digitizer module front panel IF IN connector.
  6. The PXIe-5622 IF digitizer module filters and conditions the signal and applies gain and dither.
  7. The A/D converter (ADC) converts the signal from analog to digital.
  8. The onboard memory (buffer) receives digitally downconverted and resampled data.
  9. The PXI Express controller sends the data to the host computer.

(14 GHz) for Frequencies Between 3.6 GHz and 14 GHz

  1. The RF source signal enters the PXIe-5605 front panel at the RF IN connector.
  2. The optional preselector, which has a 47 MHz typical bandwidth and is used for frequencies > 3.6 GHz, can be enabled by the NI-RFSA driver to filter the RF input signal.
  3. The PXIe-5605 downconverter tunes the signal to a center frequency and frequency-translates it to center around either 187.5 MHz, 190 MHz, or 199 MHz, depending on the IF filter you select.
  4. The frequency-translated signal is filtered by the IF filter.
  5. The filtered signal passes from the PXIe-5605 RF signal downconverter module front panel IF OUT connector to the PXIe-5622 IF digitizer module front panel IF IN connector.
  6. The PXIe-5622 IF digitizer module filters and conditions the signal and applies gain and dither.
  7. The A/D converter (ADC) converts the signal from analog to digital.
  8. The onboard memory (buffer) receives digitally downconverted and resampled data.
  9. The PXI Express controller sends the data to the host computer.