S
Scale
Hello. I have a simple question.
I am currently taking an electronics course and I'm confused by one
thing: When is output resistance desirable?
We are studying various typed of amplifiers and transister based
circuits (source followers, current sinks, differential amplifiers,
etc, pretty common stuff I guess), and we're always finding Rin, Rout,
Av, etc of the entire amplifier. Av is a given, but what exactly is
the significance of Rout? I would have assumed that a low Rout would
be desirable for the same reason that a low Rout is desirable in a
voltage source (er... right?). Am I right? Are there times when a high
Rout is desirable? Is it always desirable?
Also, on that note, a high Rin IS a good thing, right? I assumed that
a lower Rin means that connecting the amplifier has a stronger effect
on the circuit and alters the results.
Any help greatly appreciated! Thanks a lot!
--MDL
I am currently taking an electronics course and I'm confused by one
thing: When is output resistance desirable?
We are studying various typed of amplifiers and transister based
circuits (source followers, current sinks, differential amplifiers,
etc, pretty common stuff I guess), and we're always finding Rin, Rout,
Av, etc of the entire amplifier. Av is a given, but what exactly is
the significance of Rout? I would have assumed that a low Rout would
be desirable for the same reason that a low Rout is desirable in a
voltage source (er... right?). Am I right? Are there times when a high
Rout is desirable? Is it always desirable?
Also, on that note, a high Rin IS a good thing, right? I assumed that
a lower Rin means that connecting the amplifier has a stronger effect
on the circuit and alters the results.
Any help greatly appreciated! Thanks a lot!
--MDL