> Look at ECL gates. They can be really fast. I'd guess CMOS has=0A=
> overtaken them though.=0A=
=0A=
I'll leave my comments below re ECL as they may have some value BUT=0A=
=0A=
InGaAs / InGaP - 40 GHz toggle.=0A=
=0A=
From=0A=
=0A=
ABSTRACT: http://www.researchgate.net/publication/3064611_High-speed_small-=
scale_InGaPGaAs_HBT_technology_and_itsapplication_to_integrated_circuits=0A=
FULL:  http://www.researchgate.net/publication/3064611_High-speed_small-sca=
le_InGaPGaAs_HBT_technology_and_itsapplication_to_integrated_circuits=0A=
? http://www.researchgate.net/publication/3064611_High-speed_small-scale_In=
GaPGaAs_HBT_technology_and_itsapplication_to_integrated_circuits/fulltexts/=
4e5fb41ff0c41c4932e8c238.pdf/images/1.png=0A=
=0A=
=0A=
High-speed small-scale InGaP/GaAs HBT technology and its application=0A=
to integrated circuits=0A=
=0A=
Says:=0A=
=0A=
  ... We have also fabricated digital and analog circuits=0A=
using these HBTs.=0A=
=0A=
A 1/8 static frequency divider operated at a maximum toggle frequency=0A=
of 39.5 GHz with a power consumption per flip-flop of=0A=
190 mW.=0A=
=0A=
A transimpedance amplifier provides a gain of 46.5=0A=
dB=B7=D9 with a bandwidth of 41.6 GHz at a power consumption of=0A=
150 mW.=0A=
=0A=
These results indicate the great potential of our HBTs for=0A=
high-speed, low-power circuit applications=0A=
=0A=
=0A=
______________________________=0A=
=0A=
ECL=0A=
=0A=
=0A=
Magic words include PECL & LVPECL=0A=
=0A=
=0A=
=0A=
Output rise/fall ~=3D 200 ps typical=0A=
http://www.onsemi.com/pub_link/Collateral/MC10EL04-D.PDF=0A=
=0A=
Around 3 GHz toggle seems typical for tip spec parts.=0A=
=0A=
BUT=0A=
4 GHz toggle:=0A=
Differential receiver -=0A=
http://www.onsemi.com/pub_link/Collateral/MC100EP16VS-D.PDF=0A=
=0A=
> 4 GHz toggle.=0A=
Divide by 4 - http://www.datasheetcatalog.org/datasheet/on_semiconductor/MC=
10EL33-D.PDF=0A=
=0A=
Clock / data buffer.=0A=
May be made to think it's a gate :-)=0A=
> 8 GHz data rate.=0A=
> 5 GHz clock=0A=
=0A=
=0A=
=0A=
D Flipflop.=0A=
2.9 GHz toggle MINIMUM=0A=
http://www.datasheetcatalog.org/datasheet/on_semiconductor/MC100LVEL31-D.PD=
F=0A=
=0A=
=0A=
2.5 GHz buffer=0A=
http://www.micrel.com/_PDF/HBW/sy100ep15v.pdf=0A=
=0A=
Divide by 2=0A=
3 GHz toggle=0A=
http://www.datasheetcatalog.org/datasheet/on_semiconductor/MC10EL32-D.PDF=
=0A=
=0A=
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