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THS6214 Bias settings have no effect on bandwidth for white noise

arthur williams73
Intellectual 390 points
Other Parts Discussed in Thread: THS6214

Spectrally flat white noise is applied to the amplifier but the amplifier output has a 5dB roll-off. The noise is band limited from 135KHz to 115MHz and it appears flat on a spectrum analyzer within a few tenths of a dB. However when the output of the amplifier is connected to a spectrum analyzer (proper 50 ohms terminations are observed) there is as much as a 5dB roll-off starting from mid-band to 115MHz.

The output signal has peaks of +/-4.5V  (9V peak to peak). A supply voltage of +/-12V is used.

When different bias settings are tried (full, mid, low) they have no impact on the roll-off. 

Is there any way to expend bandwidth or improve slewing?

  • 0
    TI__Genius 13935 points
    Hello Arthur,

    What gain setting are you using?
    Can you clarify on your connection to the spectrum analyzer? Are you using the THS6214 single ended or differential? Are you using resistive termination? What is the DC operating point with no signal applied? Are you AC or DC coupled into the spectrum analyzer?

    If you could include a schematic of the setup that would help.

    Regards,
    Loren