Re: mosfet RF amplifier with resistance
- From: John Larkin <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 22 Apr 2007 10:00:48 -0700
On Sun, 22 Apr 2007 03:29:43 +0000, Mike Monett <No@xxxxxxxxx> wrote:
jure <jure@xxxxxxxx> wrote:
Matteo,
as many others mentioned , it seems that the requirements
( GBW = 20 GHz , Cload = 250 pF) are too hard for a single transistor.
you may look at something like a cascode plus a follower-
buffer, or something like a Cherry-Hopper amplifier.
Jure Z.
Hi Jure,
I'm having trouble finding information on the Cherry-Hopper circuit
configuration on the web. Some links require subscriptions, so they are of
little value.
There is a schematic in Figure 2 of
http://www.uni-
stuttgart.de/int/institut/mitarbeiter/MA_Publikationen/tao/2003_EL_diffTIA.
pdf (135kb)
(sorry for the wrap)
If you have time to look at it, is it the feedback from the MN3 source to
the MN2 gate?
The rest of the circuit seems very conventional. But its not clear why that
arrangement would be much more effective than other feedback
configurations. There's a bit of explanation in the text - do you know of
any other links that might explain it in more detail?
Regards,
Mike Monett
Negative feedback doesn't increase gain-bandwidth product.
John
.
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