I am using the HMC767 evaluation board connected to the HMC361 frequency divider evaluation board. The HMC767 seems to be working fine by itself but when connected to the HMC361 I see a dead band between 4.2GHz and 4.35GHz. Outside these frequencies the signal is perfectly fine. I increased the 5V a bit up to 5.3V and the band narrowed to 4.23-4.3GHz. Any help?