AN3028 Datasheet, PDF (27/37 Pages) M/A-COM Technology Solutions, Inc. – ESD Protection of Broadband GaAs CATV & FTTx Amplifiers

AN3028
Guidelines for feedback loop calculation
If the margin is not high enough, another choice should be done for fZc, fPc and fcross, and
the procedure repeated.
When the stability is ensured, the next step is to find the values of the schematic
components, which can be calculated using the formulas below, as follows:
Equation 10
R5 =
R6
Vout _{− 1}
3.3
Equation 11
C7 = ^fZc ⋅ ^Gm ⋅ ^R5
fPc C0 R5 + R6
Equation 12
Equation 13
C8 = C7 ⋅ ⎜⎛ ^fPc − 1⎟⎞
⎝ ^fZc ⎠
R7 =
C7 + C8
2 ⋅ π ⋅ fPc ⋅ C7 ⋅ C8
Doc ID 16135 Rev 1
27/37