Digital circuits at high frequency?.......

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walkman

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Hi,

i am currently working on high speed interconnects i want to why we cant operate(use) digital circuits at high frequencies(ex:15Ghz)and why we are going for analog circuits for high frequencies?

Thanks in advance.
 

walkman said:
Hi,

i am currently working on high speed interconnects i want to why we cant operate(use) digital circuits at high frequencies(ex:15Ghz)and why we are going for analog circuits for high frequencies?

Thanks in advance.
Click to expand...

Are you referring to the High-Speed Transmitter/Receiver for I/O interfaces or are you referring to core Transmitter/Receiver?
 

digital circuits are composite circuit blocks using switching elements of various types. Each of these elements has a capacitance of some amount which CANNOT be reduced below some minimum limit (depends on the technology). Hence the circuits are unable to 'switch' faster than a corresponding maximum.

This is also one of the reasons that lower switching voltages are used to help speed things up.
 

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