The tinySA contains all the components of a conventional heterodyne swept spectrum analyzer.
The components used in low input mode are:
- In low input mode the signal enters the tinySA through the low SMA connector
- 0-31dB settable Attenuator to protect the RX and prevent internally generated harmonics distortion
- 350MHz low pass filter to eliminate aliases
- A TX block that contains the local oscillator to do the scanning of the selected frequency range.
- The switch is used to enable the tracking output to the high output if activated
- Mixer that mixes the output from the low pass filter with the local oscillator to create the high IF.
- Band pass filter at 433.9MHz 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 3kHz and 600kHz.
- Power detector with 120dB dynamic range after the resolution filter.
The components used in high input mode are:
- In high input mode the signal enters the tinySA through the high SMA connector
- A switch to route the high input to the RX block
- An RX block containing
- LO and mixer to downconvert the selected frequency range to a low IF at 870kHz. Mirror suppression is limited to 30dB
- Selectable resolution filters between 3kHz and 600kHz.
- Power detector with 120dB dynamic range after the resolution filter.Local oscillator that does the
The components used in low output mode are:
- TX block with Local oscillator generating 433.9MHz
- A switch to route the TX output to the Band Pass Filter
- Band pass filter removing the harmonics of the 433.9MHz local oscillator.
- Second TX with local oscillator that determines 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
- Low pass filter for the low output to remove unwanted mixer products.
- Output attenuator connected between the low pass filter and the low output to optionally reduce the output level
- The generated signal leaves the tinySA through the low SMA connector
The components used in high output mode are:
- Local oscillator that determines the output frequency.
- A power amplifier with selectable output power between +5dBm and +20dBm
- The switch connects the power amplifier to the high 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 -25dBm into 50 ohm as power reference connected to the high output.