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OPA552: Can I make 0V amplified output when feeding 0 V input?

Part Number: OPA552

Hi, guys. I'm using Arduino DUE's DAC and a high pass filter to create the above pulse.

I'm using OPA552PA supplying + - 30 V and the aforementioned pulse is the V_in (positive input).

R1 = 150k, R2 = 10k Ohm

When my input signal becomes 0V, I want the output voltage to become 0 V as well.

What type of extra circuit should I add to make this feasible?

  • Hi David,

    why are you opening a new thread?

    No extra circuit has to be added:

    david1.TSC

    Kai

  • kai klaas69 said:
    No extra circuit has to be added:

    Thanks, Kai.

    kai klaas69 said:
    why are you opening a new thread?

    Because, there were no extra updates. Thanks.

  • Hi David,

    The OPA552 output voltage will be close to 0 V when the input voltage is in the 0 V portion of the waveform. However, op amps do exhibit some level of natural input voltage offset (Vos). The OPA552 is specified with a typical Vos of +/-1 mV and +/-3 mV max at room temperature, and can be as high as +/-5 mV over the junction temperature (Tj) range of -40°C to 125°C.

    Your circuit is set up with a non-inverting gain of +16 V/V. The input Vos will be amplified by that gain and an output voltage offset (Voso) will result that could be as high as (16 V/V)(+/-5 mV), or +/-80 mV. It will likely be less, but whatever level results it won't quite be zero volts.

    An intentionally added offset can be summed into the op amp input to null the output offset, but the output will only be zero for the conditions in which the null was accomplished. If temperature, supplies, etc. change the offset will move off of zero.

    Regards, Thomas

    Precision Amplifiers Applications Engineering