op amp unity gain bandwith & slew rate

Discussion in 'Homework Help' started by notoriusjt2, Oct 31, 2010.

Feb 4, 2010
209
0

my book states the following

SR=ΔV/Δt
unity gain bandwith = gain bandwith product
GBW=Ao * f-3dB

how do i find the open loop gain of this
and
what the heck is f-3dB
and
SR=ΔV/Δt
is the change in voltage the difference between 20mV and 6V?
what is the change in time?

Apr 5, 2008
15,799
2,386
Hello,

Read this application note on amplifier specifications.

Bertus

• sloa011Understanding Operational Amplifier Specifications.pdf
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Feb 4, 2010
209
0
that looks like a great read on the op amp. I am printing it out now. however, I dont have enough time to read the whole thing right now. I did find some useful formulas though

B1(unity-gain bandwith) specifies the frequency at which AVD of the op amp is 1:

so

B1 = f @ AVD = 1
AVD=differential voltage amplification
no formulas to find AVD though

4. Wendy Moderator

Mar 24, 2008
20,772
2,540
Slew rate is the fastest speed an op amp output can move. It can resemble frequency response, but it isn't. It has to do with waveform reproduction.

Feb 4, 2010
209
0
AVD - Differential voltage amplification

The ratio of the change in the output to the change in
differential input voltage producing it with the common-mode
input voltage held constant.

20mV/6V?