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THS4121: THS4121 - Input Capacitance

Marlene Dumas
Prodigy 10 points
Part Number: THS4121


We currently need to model the THS4121 amplifier, nevertheless regarding its input stage the datasheet does not detail the common mode capacitance and the differential capacitance. On the other hand, it gives the Input Capacitance in closed loop Ci. What does this capacity correspond to?
 
I thank you in advance for your response.
  • 0
    Guru 140200 points

    Hi Marlene,

    "closed-loop" means that the -input of OPAmp sits on the same potential as the +input. This means that the differential capacitance is nearly bootstrapped out by the feedback. So, the closed-loop input capacitance should be the common mode input capacitance.

    Kai