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diode connected load

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njm4206

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whats the use of diode connected load?how to calculate its op voltage and OP Resistance?
 

You should refer to razavi for output resistance etc...it can be derived from small signal model..
There are number of ways to implement the pmos source load for a common source nmos transistor...
A. Using a big resistor
B. Using a diode connected pmos
C.using a common source pmos...

One of the advantage of B would be that diode will be self biased...thus not requiring an additional bias generator...
 
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