channel lengths in 2 stage opamp design

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hi,
Is is correct to use two different channel lengths in 2 stage opamp design ???
Will it cause offset ?
I am using 0.18µ CMOS tech.
I am using L = 0.54µ in stage 1 and L = 0.18µ in second stage.

Thanks

 

[erikl]

Is is correct to use two different channel lengths in 2 stage opamp design ???

Sure, why not?

I am using 0.18µ CMOS tech.
I am using L = 0.54µ in stage 1 and L = 0.18µ in second stage.
Will it cause offset ?

Not if used in different stages. Yes, if done with transistors which belong together, like differential input FETs, current mirrors (also for different stages), ...

 

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thanks lot for the reply