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Negative Resistance - RF Cafe Forums
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Quasar
Post subject: Negative Resistance Posted: Sun Sep 16, 2007
9:23 am
Captain
Joined: Fri Aug 11, 2006 6:07 am
Posts:
5
I'm trying to synthesize a negative resistance to add to a circuit.
As far as I know there are three popular ways of doing so:
1. Using
a device with negative resistance characteristics (e.g. Tunnel Diode).
2. Using a configuration of OpAmps with feedback that gives a negative
resistance when seen from the input.
3. Using a configuration of
BJTs, ot FETs.
It is the third method that I'm interested in
since I'm working at a somewhat high frequency and I need to be able
to integrate the resulting circuit on an IC. I'm specifically interested
in making a negative resistance using MOSFETs. I did read a couple of
papers that talked about the subject but it was quite general, with
no reference to biasing or methods of tuning. While I was able to sucessfully
simulate a negative resistance using two MOSFETs, the resulting resistance
was quite large (tens of Mega Ohms) and it was unstable when put in
a larger circuit.
The resistance I need is S-type, in the range
of tens of Ohms. Can anyone point me to where I can get more info on
this subject?
Posted 11/12/2012
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