Hello.

I'm interested in AD9852 Evaluation Board, because I need **chirp generator** for the source of FMCW radar system.

a few questions...

From above figure,

1. What is maximum center frequency(fc)and frequency chirping range(delta F)?

2. What is the upper and lower limit for chirp duration(delta T)?

3. How fast can I sweep frequency? (=delta F/delta T)

4. Is it possible to get above freq-time characteristic? (linear triangular form)

Thanks you. javascript:;

Hi JongSeop,

1.) 150MHz, the nyquist frequency for the given 300MSPS update rate. This is true as long as you employ a sharp roll-off low pass filter.

2.)The fastest delta T is equal to 1/((N + 1)(System Clock Period × 2))., where N = 0.

3.) Delta f can be as large as the Nyquist frequency. Given the fastest delta T of which I mentioned before. You can immediately derive delta f / delta t.

4.) Yes it is possible. In actuallity, the DDS is designed with that kind of application in mind. Refer to page 18 of the datasheet for more details.

Best Regards

Louijie