Re: how to find the Rin of the self-bias cascode current-mir
hi, timer
could Rin calculate used with feedback theory? assume the node 2 is output node, then we can regard R as a thunt-thunt feedback resistance. then analysis this circuit use the classic feedback theory, in the input node,connect the node 2 to ground, in the output node, connect the node 1 to ground. Rin(OPEN LOOP)=R,
the Rin(close loop)=Rin(open loop)/(1+Aloopgain), then the Rin(close loop) will smaller than R. this is contrast to the results in the ALLEN's book, what's the error in my analysis?