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THS7530: THS7530 Noise Figure in AC Single-Ended Input Configuration

Tim Reilly94896
Prodigy 155 points
Part Number: THS7530

Hello TI Forum,

I have a question on the THS7530 noise figure.  The data sheet noise figure references Figure 16, which uses a RF-transformer to generate the differential input.  I would like to drive the THS7530 from a single-ended 50 ohm source applied to Vin using the circuit shown in data sheet Figure 19.  Will I still get the same noise figure performance shown in data sheet Figure 3 with the single ended input?

Thanks,

Tim

  • 0
    Guru 140200 points
    Hi Tim,

    the circuit of figure 19 has more resistor noise between the inputs compared to the circuit of figure 18. Also, due to the asymmetrical input circuitry of figure 19 the supply voltage noise being injected by the 1k voltage divider is no longer suppressed by the common mode rejection of THS7530 but is partially converted into a differential signal which now becomes amplified by the THS7530. So, yes, the noise should rise a bit.

    Kai
  • 0 in reply to kai klaas69
    Prodigy 155 points

    Hi Kai,

    Thanks for the information.  That makes sense.  Thanks for the explanation and the fast answer.  I apologize for the being slow getting back to you, (I looked at the answer as soon as you sent it)

    Best Regards,

    Tim