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just assume ur boost amp is completely ideal and having infinite gain and bw.
now, roughly determine how much voltage u want at the souce of ur cascode transistor.
for example: at pbias1=vs@pcasode=vdd-von@ptop~3-200mV~2.8V
put the same voltage (2.8V for pbias1) at the input to boost amp.. now...
avinash bhai,
just sweep the common mode input and check ur gain.
the range of CM which is meeting ur gain spec is ur CMIR.
PS: i think u shd be polite with assembly. he was trying to help u. avoid using the words "u r wrong". u can use better words to put ur arguments..
Re: Opamp Biasing current
If u are concern about ur UGB then using PTAT is a good idea.
at Slow corner (125 degree) u will have a higher Bias current.
which will cause u a better gm and hence UGB.
while is Fast or typical corner u can meet ur speed spec with
lower current that a PTAT can...
In transients each stage will cause some distrubance in the bias circuit (voltages).
the bias sharing sometimes causes loops at system levels and u have to
be very careful abt stability of that loop.
thomas h. lee ee214
can someone plz tell if these are latest (Autumn2005) lectures..
i hav the older version of the lectures and i m looking for the new copies..
thanx
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