Hi, I want to confirm the chirp capabilities of the AD9914 for FMCW radar applications.
Assuming we are using the AD9914 evaluation board.
Let’s say we use a 125 MHz reference clock and the internal PLL with a x20 multiplier to get a 2.5 GHz system clock (which is the maximum achievable system clock without using an external 3.5 GHz reference clock, right?).
Is there any disadvantage of using a lower reference clock such as 10 MHz x250 to get 2.5 GHz, other than the 20log(N) increase in phase noise?
Would it be able to perform a 900 MHz (10-910 MHz) triangular or sawtooth chirp with a period of 300 μs?
If not, what are the limitations for bandwidth and sweep time/period for a wideband chirp, other than the Nyquist frequency limitation?
For a triangular sweep, will the frequency step be approximately 57 kHz?
thank you
Edit Notes
Reformulated a question for clarity.[edited by: RolfOle at 10:57 AM (GMT -5) on 13 Feb 2026]
