I have a question about the divider in the "output channel" of HMC7044(HMC7043).
The Condition:
Input external clock to FIN pin and select External VCO.
The external clock frequency(fin) : 2.4GHz, +6dBm
Output MUX selection : Channel Divider Output
Corse Digital Delay .. OFF, Channel Divider Ratio .. 1
The image of fin/2(1.2GHz, -42.15dB) appears in the above condition.
When I change Output MUX Selection to "fundamental", this image is drastically reduced (< -66.17dB).
This fin/2 image increases the spurious for High-Speed ADC(AD9689) and our customer should reduce this image but he needs delay function too.
Q1. What is the cause of this fin/2 image when the divider set to 1?
(Our customer wants to know the mechanism of occurring f/2 image.)
Q2. Do you have a workaround to reduce this fin/2 image while using the divider on divide ratio=1?
Best regards,
y_suzuki
