Lecture-03 || Gain Calculation 5TOTA || Placement Series || Anuj Chauhan

[@Himanshutiwari590]

How to find the Gm, when two stages are present. @15:28

[@learningexpress183]

@@Himanshutiwari590 or do one thing, find output voltage of first stage in terms of input voltage which is nothing but the gain of first stage and then go for the output shortcircuit current at the output of second stage which is nothing but the gm of second stage hence we will be having relationship between input voltage and output short circuit current

[@YashRPant]

Hello I just have a doubt while calculating Gm According to the solution I think you are keeping tail node potential Vx=0 But the load is asymmetric..on left side looking in is 1/gm3 and right side it will be rds4 and they are not comparable... So Vx can be 0 only if we assume that gds is 0 for 5t OTA right? Can u pls guide me on this..thanks !

[@learningexpress183]

@@YashRPant yes but while you will do analysis, there is much smaller fluctuations in vx for small signal analysis...so it can be taken as virtual ground

[@learningexpress183]

@@YashRPant if not understood yet I'll can take this concept in more detail in some other video

[@YashRPant]

​@@learningexpress183 Okay it would be great.. Thanks!