HMC8362 and HMC8364 Vtune port models

Question

Re: HMC8362 and HMC8364 
 Do you have any better information on the Vtune interface schematic than that shown as fig 5 on the data sheets? 
 The HMC8362 fig 5 shows a total capacitance of 420 pF, and the HMC8364 fig 5 shows a total capacitance of 340 pF, 
 How much lot-to-lot variation is expected? Do these values vary with the DC bias on the Vt port? 
 If so, do you plots or graphs showing the effect of DC bias? 
 Is these maximum values or simply nominal values? 
 Thank you. 
 Doug

kieranb · Accepted Answer

Hi Doug, 
 These are the capacitance values selected for the Vtune interface. There should not be a significant difference from lot to lot but this is not a parameter that is measured during production test. 
 The Vtune voltage applied to the port will determine the value of capacitance on the varactor as follows: 
 HMC8362: 295pF at 0V dropping to 130pF at 13Volts Vtune 
 HMC8364: 215pF at 0V dropping to 93pF at 13Volts Vtune 
 Regards, 
 Kieran)

kieranb · Answer

Unfortunately we don't have this. It was done only at a design stage. But we do not have the supporting simulation results for this. 
 Regards, 
 Kieran

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HMC8362 and HMC8364 Vtune port models