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THS4031: Estimating linearity and improving it

Sepeedah Zadeh
Intellectual 2850 points
Part Number: THS4031

Hello team, 

Customer is working on a design with THS4031. They need to start sampling 2x the original speed at this point and it seems THS4031 will still be a good fit. How can we estimate how linear it is in the measuring range and how can we improve it?

Working conditions are:

  • Dual Power supply = +/- 9VDC
  • Gain between 1 and 3
  • Output signal range is from 0 to 4Vdc (supports 16-bit ADC)
  • Signal is the pulse (2MHz duration) and trying to measure amplitude of that pulse after signal is set up (99%).

Thank you!

  • 0
    TI__Genius 16725 points
    Hi,

    One way to measure linearity would be to plot the input and output of the amplifier. This will give you the linear relationship between the input and output. To improve linearity, one thing you can do is shift your supplies so that your supplies would be -7V to 11V. This allows you to be in the center of the supplies which will keep you away from rails where the signal might hit clamping. You can also bias the circuit to 2V so that your input signal shifts around 2V from 0V to 4V.

    Thanks!
    -Karan