full power bandwidth in opamps

hi all, plz help: What do we mean by an internally compensated op amp? Why does clipping occur near saturation and cutoff regions in an amplifier operation? What is the cause for input offset voltage in an opamp? Th fullpower band width of an op amp is given by: Wm . Vomax = SR(slew rate) W(omega) Then y do we say that o/p sinusoids with amplitudes smaller than will show slew rate distortion at frequencies greater than Wm? If drain and gate of nmos are tied to vdd then voltage at source is vdd-vtn, y ? plz explain.what happens in pmos

Asked By: chhaya11584
On: Jun 14, 2005 10:39:30 PM

Comments(2)

hi venkatesh, regarding slew rate: Wo.Vomax=SR now if we fix output level to Vomax and then inc input signal freq the product on LHS of egn will inc beyond slew rate and hence cause distortion!! but if o/p is less than Vomax.. dont u think some frequencies higher than Wo can be accomodated! i mean since we r increasing Wo and decreasing Vo in the product??

Comment By: chhaya11584
On: Jun 15, 2005 9:56:50 PM

i think internal compensation is giving input offset voltage as to remove the offset at the op.i forgot the terms so refer. 2.clipping is nothing but suppression of signal.in cutoff and in saturation it occurs .self explanatory.in saturation the op cannot exceed the max supply and in cutoff it is obvious that no proper biasing would be there(general amplifier). 3.slew rate in general is rate of change of op or how fast the ckt operates.so an amplifier is pumped with higher freq.signal it cannot produce amplified op at that rate but distorted(meaningless)signal. 4.this is straightfwd one i=K(Vgs-Vt)^2 hence after that it doesnt conduct.thats why max voltage is Vgs-Vt.bye

Comment By: venkateshr
On: Jun 15, 2005 2:03:51 AM

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