How to calculate Slew Rate for Differential folded cascode opamp.....??

Status
Not open for further replies.
A

ASHUTOSH RANE

Member level 2
Joined
Aug 7, 2009
Messages
49
Helped
2
Reputation
4
Reaction score
1
Trophy points
1,288
Location
KOZICODE
Activity points
1,589
How to calculate Slew Rate for Differential folded cascode opamp.in cadence can anybody tell me ....??
thanks in advance...:smile:
 

ASHUTOSH RANE,

After tarnsient simulation you have to do direct plot differential output signal from Results->directPlot-Transient->transient difference
Than you can deriviate this expression to calculate slew rate of differential output.

Or use this expression in cadence command line:
deriv((v("/OUT1" ?result "tran") - v("/OUT2" ?result "tran")))

Best Reguards
 
hi alex
i found the derivative accoring to formula u given ....
i got pulsed waveform
now with this wave form and defination of slew rate we can find slew rate as maximum rate of change of output .....i got such a value equal to...
SR+ =229e6.
SR- =-227e6
CL=1pF
but these are very high values right ....??
have i done any mistake in calculation of maximum slope??
 

ASHUTOSH RANE said:
SR+ =229e6.
SR- =-227e6
CL=1pF
but these are very high values right ....??
have i done any mistake in calculation of maximum slope??
Click to expand...

SR+ =229e6 = 229 V/µs which means 7.64ns for your 1.75V step. Zoom into one of your step edges and verify!
 
hi ASHUTOSH RANE

There is no any mistake in calculation,
all right!
 
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…