From: "Ken Taylor"
Subject: Re: what is cascode concept
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Date: Wed, 11 Dec 2002 20:05:24 +1300
NNTP-Posting-Date: Wed, 11 Dec 2002 20:03:46 NZDT
"Tom Bruhns" wrote in message
> Winfield Hill wrote in message
> > "Ken Taylor wrote...
> > > Ken Taylor wrote
> > >> eric wrote
> > >>> I am trying to find out what is cascode concept.
> > >>
> > >> [See] http://e-www.motorola.com/brdata/PDFDB/docs/MBC13916.pdf
> > >> as a starting point for a MMIC using this methodology. Note
> > >> the grounded gate in the second stage.
> > >
> > > Okay, base. I learnt this stuff on valves! :-)
> > Gate, base whatever. Are we to assume that the gate/base
> > leakage current is biasing the cascode stage? Check it out,
> > for "on-chip bias" they show a capacitor to ground.
> Well, it does say, "Functional diagram." Since the function is RF
> amplification, presumably they take care of the bias inside, and the
> cap lets you ground that pin without needing a bypass cap. But that
> is a pretty sparce schematic description.
The link was provided as a starting point. Motorola have some pretty good
whitepapers - apparently they've done a reasnoable amount of research at
times. I have no doubt the OP can find a bit more info.