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LMP2231: Differential Capacitance (Cd) and Common Mode Capacitance Ccm for this operational amplifier.

Jonathan James-Gunn
Prodigy 10 points
Part Number: LMP2231

I have a high gain circuit that oscillates, to calculate Cf, the input capacitance of the op amp would help greatly, it isn't on the datasheet.

  • 0
    TI__Guru 64290 points

    Jonathan,

    The common-mode input capacitance may be simulated to be 4.6pF - see below.  Also, you may assume the differential input capacitance to be the same, ~5pF.

    Since you do not show the circuit, the value of CF compensation cap should be calculated to be: CF=~(Rin*10pF)/RF - see below.