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TINA/Spice/THS3202: Frequency response doesnt match with datasheet

Part Number: THS3202
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hello,

i am trying  to simulate the THS3202 frequency response, as given bellow in the datasheet picture.

Supply set +/- 5V

I set the gain resistors to be 2.

Load resistor 100ohm

The Signal is 0.25Vpeak,   so at the output of the opamp i have 1 Vpp

When i do a sweep betwen 10hz and 3GHZ, i get the frequency response bellow, which is diferent from the datasheet.   Why? 

I am missing something?

thank you.

  • Hi ,

    First of all large signal gain cannot be verified by AC analysis like this in TINA-TI.

    This is because as we place the VG voltage source and trigger an AC analysis the tool considers it to be a small signal 1V AC input . It is how the tool works.

    So if you are interested to study the large signal you have to see the attestations/gain in transient simulation, by giving sine wave input of proper amplitude and frequency.

    You have to see the gain/attenuation at applied interested frequency points in transient and try to see how the nature is coming by drawing bode plot with those output points.

  • Hello,

    so if i understood corectly, when ploting the AC response, the signal source is fixed at 1 Volt and this is why i have diferent plot result?

    Is there no possibility to plot the phase and gain response over a large frequency area? ( 100 MHZ to 600MHZ for example) ?
  • Hi,

    Yes you can plot gain-phase by AC analysis but that will be a small signal response not a large signal one.