What is the maximum sweep slope (MHz/s) that I can achieve with the ADF4159 using the triangular or sawtooth ramp?
The sweep rate is constrained by the loop filter and any linearity requirement. Increase the loop BW and decrease the phase margin to allow fast sweeps. I measured a maximum 4 MHz/us sweep rate with the default eval board loop filter (Icp=2.5mA, Fout=12 GHz, Fpfd=80 MHz, loop BW=160 KHz with 50 degrees phase margin). 10 MHz/us sweep rates are possible after increasing the loop filter to 450 KHz.
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