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OPA 627 - non-constant input capacity over frequency?

Armin Mohring
Prodigy 30 points

Other Parts Discussed in Thread: OPA627

The datasheet of the OPA 176 (from Analog Device) describes on page 15 ff the impact of the non-constant input capacity of the JFET input stage.

Do I have the same problem with the OPA 627?

I want to built a active frequency crossover for a loudspeaker.

Thanks in advance.

Armin Mohring

  • 0
    Guru 21975 points

    Armin,

    The OPA627 has a very constant input capacitance with changes in input common-mode voltage. This is due to the special dielectric isolation process used to fabricate this device. More common junction-isolated fabrication processes have a voltage-varying input capacitance due to the varying capacitance of a reverse-biased diode.

    Regards, Bruce.