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one question about integer boundary spur of HMC833

Question asked by dinshitao@163.com on Apr 26, 2015
Latest reply on Apr 27, 2015 by dyoung1

捕获.PNG

This picture in the datasheet is when hmc833 output 5900.8MHz(Fractional Mode B, 50 MHz PD frequency, 74 kHz Loop Filter BW). AS I  can see there are spurs at the offset of 400KHz and 800KHz. I an understand that the spur at 800KHZ is  integer boundary spur.But I don't know about the spur at 400KHz,how do this spur generate?

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