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OPA317 Overdriven

Other Parts Discussed in Thread: OPA317

OPA317 is used in small signal amplification circuit. In the process of using OPA317, there will be Overdriven, IN + 5V.

1. Can the structure of the following pictures be understood as self protection of IC? Is there any risk of damage in this way? Are there any additional countermeasures for the peripheral circuit?

2. During the BCI test, the AMP output is unstable at 27MHz~30MHz. How is the loop stability evaluated under this loop condition? Is there any way to improve?

  • Hi Meng,

    figure 20 shows the internal protection against high differential input voltages. But if the input signal exceeds the rails you need additional current limiting, as mentioned in sections 6.1 and 8.3.2 of datasheet. I see that you already have some resistors in the circuit which can serve as protection.

    The best measure against EMI from BCI is to use shielded cables, best with the shield connected at both ends to signal ground. Let the ultra fast electrons in the shield do their job for you...

    Kai

  • Meng

    We haven't heard back from you so we assume this answered your questions. If not, just post another reply below.

    Thanks
    Dennis