Like always, nice catches Russell.=0A= =0A= DOI:10.1109/16.960388 seems interesting I will check it out in depth.=0A= =0A= So a approximate value is around 255GHz I suppose.=0A= =0A= =0A= On Thu, Aug 2, 2012 at 3:38 PM, RussellMc wrote:=0A= >> 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_smal= l-scale_InGaPGaAs_HBT_technology_and_itsapplication_to_integrated_circuits= =0A= > FULL: http://www.researchgate.net/publication/3064611_High-speed_small-s= cale_InGaPGaAs_HBT_technology_and_itsapplication_to_integrated_circuits=0A= > ? http://www.researchgate.net/publication/3064611_High-speed_small-scale_= InGaPGaAs_HBT_technology_and_itsapplication_to_integrated_circuits/fulltext= s/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/= MC10EL33-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.= PDF=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= > --=0A= > http://www.piclist.com PIC/SX FAQ & list archive=0A= > View/change your membership options at=0A= > http://mailman.mit.edu/mailman/listinfo/piclist=0A= =0A= -- =0A= http://www.piclist.com PIC/SX FAQ & list archive=0A= View/change your membership options at=0A= http://mailman.mit.edu/mailman/listinfo/piclist=0A= .