we have to implement the schematic of ADL5365 for our project. In the table 8 of datasheet several components are suggested in default conditions. We have an issue about components with refdes: C1, C12 and C10. These components need for ac-coupling of RF and LO ports. The table reports the nominal value of capacitors, but it is not clear if the value is referred to a particular frequency or not.
Our questions are the following:
- Do the 3 pF and 22 pF capacitors have to be chosen by taking into account the frequency variation of their impedances? For example, if RF signal is at 2 GHz, do we choose the capacitor to have 3 pF at 2 GHz?
- Do the value of capacitors have an impact to RF and LO input impedance? If yes, how could I foresee?
- Could you suggest a part number for these components?