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

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ASHUTOSH RANE

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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 Screenshot.png
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!
 
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