slew rate
Post on 30-Dec-2015
33 Views
Preview:
DESCRIPTION
TRANSCRIPT
Slew Rate
M.S.P.V.L Polytechnic College,
Pavoorchatram.
www.ustudy.in
Introduction
The slew rate is an important characteristic for
amplifiers and electronics of elements
The slew rate represents the maximum rate of
change of a signal at any point in a circuit.
Limitations in slew rate capability can give rise to
non linear effects in electronic amplifiers.
www.ustudy.in
OP-AMP Slew Rate
www.ustudy.in
Cont.,
For a sinusoidal waveform not to be subject to slew rate
limitation, the slew rate capability (in volts per second) at all
points in an amplifier must satisfy the following condition:
SR
Vpk
www.ustudy.in
Definition
The output slew-rate of an amplifier or other electronic
circuit is defined as the maximum rate of change of the
output voltage for all possible input signals.
SR
dvout(t)dt(
(
max
=www.ustudy.in
Slew Rate switching diagram
www.ustudy.in
Slew Rate Calculation
Step1
Obtain a voltage versus time plot of an electronic
waveform for the electronic component you want to
know about.
You can ask the component's manufacturer for a data
sheet that illustrates the slew rate.
www.ustudy.in
Slew Rate Calculation
Step2
Calculate the voltage change. Subtract the lowest
voltage from the highest voltage.
Conclude that for a high voltage of 5 volts and a low
voltage of 0 Volts, the voltage change is 5 Volts, since 5
minus 0 is 5.
www.ustudy.in
Slew Rate Calculation
Step3
Calculate the time change. Subtract the time at which the
lowest value voltage occurs from the time the highest value
voltage occurs.
Conclude that if a low voltage of 0 volts occurred at time, 1
second and that a high voltage of 5 volts occurred at time, 4
seconds, the time change would be 3 seconds, since 4 minus 1 is
3.www.ustudy.in
Slew Rate Calculation
Step4
Calculate the slew rate.
Divide the voltage change by the time change.
Conclude that if the voltage change was 5 volts and the time
change was 3 seconds, the slew rate would be 1.66 Volts per
second, since 5 divided by 3 is 1.66.
www.ustudy.in
No overshooting arises in the output wave form
www.ustudy.in
Rising flanks of the signals
www.ustudy.in
Falling flanks of the signals
www.ustudy.in
The End
....... Thank You …….
www.ustudy.in
top related