Analog Circuit Design interview find incremental impedance

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Analog Design Interview/Screening Test questions for Texas Instrument ,Micron Technology, ST Microelectronics, Synopsys, Steradian semiconductor, NXP Semiconductor, Analog Devices, Intel, Samsung etc.
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All important interview question-
*Analog Design Engineer Interview Question:
• Find small signal Vo f...
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[@Anindra008]

Nice🎉

[@AmitBar-Analog_Circuits]

Thanks

[@YashRPant]

For first circuit differential pair.. We can also derive Vp incrementally as Vp=gm1V1+gm2V2/(gm1+gm2) So for finding Rx..we are applying a common mode signal which is nothing but ground so Vp=0...and Rx=2ro

[@dushyantsinhdabhi4772]

If we connect vt in the last circuit to find Rout, can't we consider the resistance of M4 as rds4 as we are seeing it from drain of the M4?