Amplifier selection help: DC amplification

Hello.

I need help selecting an amplifier to amplify signal after an IQ mixer that is mixing signal down to DC. My requirements are as follows:

-Freq range: DC to 200 + MHz

-Single-sided input/outputs

-50 Ohm matched input and outputs (this could be accomplished with an evaluation board)

-Evaluation board option

-Non-inverted signal

-Gain: > 10

I had purchased the AD8330 - however the evaluation board is AC coupled, which completed distorted our DC signal. So I now need an alternative that will accomplish similar amplification (it does not need to to be variable gain), and I need to make sure is that the evaluation board associated with the amplifier is NOT AC coupled.

Regards,

Alisa

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  • 0
    •  Analog Employees 
    on Mar 15, 2016 2:02 AM

    Hi, Alisa,

        Your requirements can probably best be met with one of the following Current FB Opamps together with another inverting stage (with G=2 to make up for the voltage division with a 50 ohm series output resistor into the 50-ohm load).:

    -- AD8003 (Triple 1.5 GHz)

    -- AD8009 (Single 1.58 GHz)

    -- AD8003 (Single 1 GHz)

        Note that BW at G=10 will be much less than the listed F3dB which are for G=1.  The Zin=50 requirement can be met by using Rg=50 and Rf=500 ohm, which changes frequency response slightly, but should still be > 200 MHz.  If the input is GND referenced, they need to run on +/- supplies.  Depending on your DC accuracy requirements, some means of offset adjustment may also be needed.

    Benjamin

Reply
  • 0
    •  Analog Employees 
    on Mar 15, 2016 2:02 AM

    Hi, Alisa,

        Your requirements can probably best be met with one of the following Current FB Opamps together with another inverting stage (with G=2 to make up for the voltage division with a 50 ohm series output resistor into the 50-ohm load).:

    -- AD8003 (Triple 1.5 GHz)

    -- AD8009 (Single 1.58 GHz)

    -- AD8003 (Single 1 GHz)

        Note that BW at G=10 will be much less than the listed F3dB which are for G=1.  The Zin=50 requirement can be met by using Rg=50 and Rf=500 ohm, which changes frequency response slightly, but should still be > 200 MHz.  If the input is GND referenced, they need to run on +/- supplies.  Depending on your DC accuracy requirements, some means of offset adjustment may also be needed.

    Benjamin

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