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TINA/Spice/THS4521: the common mode voltage offset

user4973896
Expert 1555 points
Part Number: THS4521
Other Parts Discussed in Thread: TINA-TI, TIDA-00499

Tool/software: TINA-TI or Spice Models

hello ，in article “Using fully differential op amps as attenuators, Part 3: Single-ended  unipolar input signals” ，there is a ciruit  which can balance the  common mode voltage offset？

But  I find  in design tida-00499 ，there is  another circuit ，the input  end which is not drive by signal  was only  a resistor R22 which act as Rs-，and there is no RT-,so i don't know if i use this  design ，how to calculate?

  • 0
    TI__Intellectual 1910 points

    Hello,

    In the above schematic, RG+ is R8 (487), RF is R7 (499) and R21 (499), RG- is R22 (523).

    Rs- and RT- are not shown in this schematic, because instead of a resistive voltage divider, a amplifier in a buffer configuration (gain = 1) is used for the reference voltage. It is not the exact same circuit.

    In the future, please do not create several different threads for the same question. Please direct future questions about this circuit to this post.