- #1
eyeweyew
- 27
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- Homework Statement
- Negative PSRR of the Two-Stage Op Amp with VBias Connected to ground vs connected to Vss
- Relevant Equations
- PSRR- model for Two-Stage Op Amp with VBias Connected to ground
From page 4-9 of this lecture note https://pallen.ece.gatech.edu/Academic/ECE_6412/Spring_2004/L180-PSRR-2UP.pdf, it gives example on how to model a Two-Stage Op Amp to find the PSRR- when VBias is connecting to ground as oppose to when VBias is connecting to Vss. One thing I don't understand is why rds7 is modelled differently given that it is connecting Vout and Vss in both cases?
Also, not sure why Cgd5 is not included in the model? although it doesn't make any difference to the outcome.
Reference:
CMOS analog circuit design. Authors: Phillip E. Allen, Douglas R. Holberg.
pg.307-309
[Link to full PDF copy of textbook redacted by the Mentors]
Also, not sure why Cgd5 is not included in the model? although it doesn't make any difference to the outcome.
Reference:
CMOS analog circuit design. Authors: Phillip E. Allen, Douglas R. Holberg.
pg.307-309
[Link to full PDF copy of textbook redacted by the Mentors]
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