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Wideband Chirp Generation with DAC

Valentin Poncos
Prodigy 10 points
Other Parts Discussed in Thread: DAC34H84, DAC3482, DAC34SH84, TRF3705

I'm interested in a quick solution (meaning that evaluation boards are available) in generating a 400MHz BW chirp in the 5-6GHz band. Chirp time should be some 10us to 100us, with a repetition interval of some ms. I would prefer that the pattern loaded to be transmitted continuously (from an on board buffer, not from the PC).

One solution in mind is to use a high speed DAC to create a sawtooth, which is later applied to a VCO (preferred solution).

The second would be to generate the RF chirp with a DAC, at lower frequency and up-convert it later. 

Could you please indicate your best solution?

Thanks in advance,

Valentin

  • 0
    TI__Genius 12965 points

    Hi Valentin,

    We have a couple of options that can help with both cases.

    The DAC3482 and DAC34H84 or DAC34SH84 can generate 400MHz BW signals at IF to drive a VCO.

    We also have an RF output version of the EVM, TSW30H84 and TSW30SH84 which has the TRF3705 IQ modulator that will output up to 4GHz.  The IQ modulator can be swapped out for the TRF3704 which can output up to 6GHz.

    The DAC and TSW can be driven by the LVDS patterns from TSW1406 (64k samples memory) or TSW1400 (up to 512M samples memory) depending on your chirp sample length.

    All of these EVMs are available via ti.com

    Ken.