Mayank
|
Hi student, There's a pretty straight-forward way to design a opamp for unity buffer config. Opamp design is simple, you can choose any topology - differential/single-ended / 1stage/2stage OTA design. Two important things to keep in mind while designing unity gain buffers are :- 1. ICMR and OCMR should overlap & should satisy your signal swing specs. 2. Output CM level & I/p CM level should match / kept in mind while designing.
Fully Differential topology will allow you to place a good CMFB ckt to control output/input CM level.
Design of OTA is basic and you can use gm/id methodology for it.
Pls lemme know if you hv any further queries.
regards, Mayank.
|