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tinySA Ultra Technical Description

The tinySA contains all the components of a conventional heterodyne swept spectrum analyzer and an RF signal generator

The components used in input mode are:

  • In input mode the signal enters the tinySA through the RF SMA connector
  • A switch selects between an LNA or a 0-31dB step attenuator
  • A switch selects either a 800MHz low pass filter to eliminate aliases, bypasses the LPF for ULTRA mode or bypasses the LPF, mixer and BPF for direct mode.
  • A local oscillator to do the scanning of the selected frequency range.
  • Mixer that mixes the output from the second switch with the local oscillator to create the high IF.
  • Band pass filter at 980MHz for the high IF that eliminates spurs and cleans the output from the mixer before the downconversion.
  • A switch to route the output of the BPF to the RX
  • And RX containing
    • Second LO and mixer to downconvert the high IF to a low IF at 870kHz.
    • Selectable resolution filters between 200Hz and 800kHz.
    • Power detector with 120dB dynamic range after the resolution filter.

The components used in output mode are:

  • TX block with Local oscillator generating 980MHz
  • A switch to route the TX output to the Band Pass Filter
  • Band pass filter removing the harmonics of the 980MHz local oscillator or directly to the second switch
  • The LO determining the output frequency.
  • Mixer that mixes the output from the band pass filter with the second local oscillator to create the desired output frequency with limited harmonics
  • Switch that optionally selects a low pass filter to remove unwanted mixer products
  • Switch that enables the attenuator to optionally reduce the output level
  • The generated signal leaves the tinySA through the RF SMA connector

The calibration generator:

  • 30MHz temperature controlled crystal oscillator
  • Selectable dividers to create 30, 15, 10, 4, 3, 2 or 1 MHZ
  • Fixed voltage output driver
  • High accuracy attenuator to create a 30MHz fundamental of -36.5dBm into 50 ohm as power reference connected to the CAL SMA.
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Page last modified on March 06, 2023, at 01:34 PM