# op amp unity gain bandwith & slew rate

#### notoriusjt2

Joined Feb 4, 2010
209

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?

#### bertus

Joined Apr 5, 2008
21,652
Hello,

Read this application note on amplifier specifications.

Bertus

#### Attachments

• 273.2 KB Views: 55

#### notoriusjt2

Joined Feb 4, 2010
209
Hello,

Read this application note on amplifier specifications.

Bertus
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

#### Wendy

Joined Mar 24, 2008
22,642
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.

#### notoriusjt2

Joined Feb 4, 2010
209
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?