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help on proper biasing of opa699

Other Parts Discussed in Thread: OPA699

Hi TI,


I am currently using OPA699 as one of the stage in my design, kindly guide me on proper biasing of OPA699, is the way shown down under proper biasing or not, i am currently tieing VHI to V+ and VLO to GND and taking care with a decoupling capacitor

kindly help

  • Hello,
    The circuit configuration for the limiters looks okay. I assumed V2 = 5V.

    Also, the amplifier looks to be in an inverting configuration in a gain of -10. The way the limiters are configured the amplifier input should never be > 0V (it should go from 0V to (-V2/10)V ) . This way any voltage within the range I mentioned will be faithfully reproduced and voltage outside the range will be clamped by one of the limiters. Is this how you intended to use the device?
  • i did not get you when you said the gain is -10, in fact i am using it as an inverting amplifier of gain 10, and my input swing is from -2.5 to 0, and the output should only lie in b/w 0-5V as configured, i had a little doubt in directly hooking up VHI to Vcc(+5V) and VLO to GND, your answer seems , that there is no wrong in my configuration, i have also took the spice model and simulated, it did not pose any problem.

    correct me if any mistakes in my understanding

    thanks
  • Daram,
    a gain of -10 = inverting gain of 10. If your input is -2.5V to 0V, then the ideal output would go from 25V to 0, however because of the clamp you will only see 5V-0V. I just wanted to ensure this was what you intended.