i am designing a differential telescopic operational transconductance amplifier and have been given the information that "the input common mode is 1.5v +/- 300mv" and that "the input common mode swing is +/- 100mv"

i am a little lost as to what this means. i have done some "googleing" and all i can find is that the common mode voltage is defined as the average of the two signals at the inverting and non-inverting inputs.

my question is how the common mode can then swing if its the average.

or have i totally misunderstood things and the common mode and the common mode voltage two different things.

 

Of the following phrase - differential telescopic operational transconductance amplifier - the term "telescopic" is unfamiliar. Could you expand on the meaning?

 

Have you Googled: differential telescopic operational transconductance amplifier ? (no " " 's)

Seems to be a lot of info. When they don't count 'transconductance' there are 661 hits.

Ken

 

or have i totally misunderstood things and the common mode and the common mode voltage two different things.

Perhaps this will help clear any misconceptions: http://www.allaboutcircuits.com/vol_3/chpt_8/13.html


Beenthere: I found this on Google, but It's over my head: https://www.eecs.berkeley.edu/~boser/courses/240_2003_sp/projects/240_Chang_Fang.pdf

 

Yeah, I thought to look it up and find it beyond exotic. Gotta be easier ways to pull/push charge onto capacitors.