Really fast analog MUX for a Tayloe detector

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i'm working on sdr using tayloe method of decoding , q incoming rf.



but requires 4:1 analog multiplexer difficult requirements i'm having hard time finding. there reference design out there using discontinued dual 4:1 analog mux, i'm hoping find specs @ least close one.

http://defenseelectronicsmag.com/site-files/defenseelectronicsmag.com/files/archive/rfdesign.com/images/archive/303tayloe58.pdf

it has strange requirement, analog mux, of requiring ability switch between channels quickly. muxes optimized bandwidth through switch, , have switch settling times on order of 100ns 10us.

there many manufacturers search...

this looks promising! design uses fairchild fst3253 analog mux specs good. propagation delay 0.25ns, ton , toff between 1 , 5ns when run on 5v. 4 ohms, , dual 4:1 port can connected in parallel minimize resistance. , 65 cents digikey!

http://www.wb5rvz.com/sdr/ensemble_rx_ii/06_mix.htm

http://www.fairchildsemi.com/ds/fs/fst3253.pdf

any suggestions?

i've got samples of fst3253 on way, guess i'll find out.


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