🚀 go-pugleaf

Hi Mike,

In article <1992Nov05.043724.130701@zeus.calpoly.edu> mruddick@joule.elee.calpoly.edu (Michael Ruddick) writes:
>Be careful...you should only have to use one op-amp for what you are doing.
>It sounds like you want the op-amp to amplify your signal as much as
>it can, then pass it to another one that does the same thing.  Op-amps
>don't work like that...just use a standard non-inverting op-amp configuration
>and set your gain...if you set it too high, then the output will just switch
>back and forth between the two supply voltage rails --> high amounts of
>distortion!

I'm not sure what the original poster's question/problem was, so I'm not
going to comment too much on your response.

However, I did want to point out that there's a very good reason (in general)
for using two cascaded op amps (providing *x*y gain=*xy gain) rather than
using just one (providing *xy) -- the gain bandwidth product.  You can
show mathematically, in not too long of a time, that the closed loop
gain bandwidth product of two cascaded op amps is greater than that of
a single one for the same gain conditions.  This is one of the reasons
that trying to make, say, x1000 amplifiers out of one op amp is a very
difficult proposition.

Maybe someone will find this useful...

					---Joel Kolstad
					kolstad@cae.wisc.edu