What are the equations for all those funny knobs?
gt7276a at prism.gatech.edu
Fri May 8 06:29:03 CEST 1998
> btw what ckt are you using?
I've been looking at some transconductance amp buildingblocks ( i.e.
LM13600 and CA3080 ) that I found in the
1984 IEEE Circuits and Systems maginize. The author
outlines general first-order and second-order setups using
OTA's. The most general form of the second order
configuration has 2 poles, 2 zeros -- all of which can be
indepedently voltage controlled. However, the only two
parameters that I know of are resonance and cutoff. I'm
guessing that both poles can affect the resonance. Here's
what I think a popular LP freq. response would look like:
/\ <--- "height", controlled by resonance
\ <-- 12dB or 24dB
Hope everyone enjoys my ACSII frequency response ;)
Maybe a good question is what other qualities of a basic
filter would be useful to change? The general model I
have has 4 controllable parameters. Any ideas?
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