SDR (was citlivost autoradia ??)

[Naprstek, Jiri]

>> No, ze sirka zpracovatelneho signalu je <=40MHz neni tak docela
>> presne, pokud je ten signal periodicky (tedy, pokud je odchylka
>> mezi periodami pod rozliseni casove i napetove kvantizace
>> prevodniku), lze signal samplovat opakovane s postupne fazove
>> posunutym samplovanim a zmerit si 500MHz sinusovku i 80MHz
>> prevodnikem.
>
>No ale sinusovka libovolne frekvence ma sirku pasma 0Hz, takze to
>neni v rozporu.

No, tak to jste me dobre chytil za slovicko :-))
OK, muzu pomoci takto rychleho S&H a prevodniku zjistit podobu jakehokoliv periodickeho signalu s frekvencnim spektrem 0 - 250MHz, tedy i se sirkou pasma 250MHz. Podminkou je akorat schopnost synchronizovat se s periodou mereneho signalu s presnosti odpovidajici 2ns vzorkovani.
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