[hpsdr] Mercury: LTC2209

[James Courtier-Dutton]

Chris Albertson wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Purely theoretical questions...
> 
> Compare the Mercury with one channel to the USRP with two 65Msps
> channels.  It seems to me that you get the same result in the end if
> you use two 65Msps channels in quadrature or if you use one "real"
> channel that runs a bit more than twice as fast.  After all you can
> divide the fast channel into even and odd samples can get out of phase
> two channels.
> 
> I know it's not the same, just wondering how the two approaches compare
> 

With high speed DACs, the sample and hold circuit becomes very
important, so two 65Msps ADCs will not perform as well as a single
130Msps ADC due to the different requirements on the sample and hold
circuit. If the 65Msps ADC actually has the same sample and hold circuit
as the 130Msps ADC, then the result will be the same, but that is
unlikely to happen in reality.

James


James


 1177181420.0