Amplifier Selection?

I have an output signal of around 20mV. I want to amplify it to ~1V without causing any phase shifting of my signal. Is it possible? If possible what type of amplifier should I use? My signal is sine or square and Frequency of my signal may be 1kHz to 500MHz.

Thanks for reply.

  • 0
    •  Analog Employees 
    on May 20, 2014 7:03 PM

    Hi Einstein,

    Based on your requirement, for now you can try cascading three AD8099 (two stages with gain of +5 and one stage with gain of +2). Please refer to page 17&18 of AD8099 datasheet for the circuit configuration.

    Is the 500 MHz upper limit of input signal a hard requirement to your application? I say this because even though the AD8099 is a high bandwidth part, it may still not be high enough for the gain that you need.

    Regards,

    Jino

  • 0
    •  Analog Employees 
    on May 22, 2014 12:02 AM

    Hi Einstein,

    I suggest you add AD8000 (1.5 GHz Ultrahigh Speed Op Amp) and AD8003 (Triple, 1.5 GHz Op Amp) to your Op Amps consideration, both are current feedback amplifiers. Current Feedback amplifiers offer wide closed-loop bandwidth, low distortion at high frequencies and faster slew rates. For the gain configurations, you can refer to page 14 of AD8000 and page 12 of AD8003 datasheet. One drawback of current feedback is that you have to use specific feedback resistance for a certain gain  but it is also included in the datasheet. The difference between AD8000 and AD8003 is that you will have to use three AD8000 unlike AD8003 which only requires one IC. Use gain of +5 for the first and second stage and +2 for the last stage.

    Lastly, may I know what type of application you're in so that I could assist you better and suggest you the best ADI part for you. I hope this helps.

    Regards,

    Jino

  • I want to measure the phase difference between two signals. One of my signal is high enough 2V sine. but other one is 20mV sine. So, I want an amplifier that could amplify my low amplitude signal to 1V or 0.2V without causing any shifting of the signal phase. Actually, I want a ready-made amplifier circuit to do that. I do like, give my input siganl IN and want an output signal without any phase shifting, like that. But, if phase shifting is low, that is also good enough. My Frequency range is DC to 200MHz. (I changed my decision from 500MHz to 200 MHz)

    Thanks

  • 0
    •  Analog Employees 
    on May 24, 2014 8:42 AM

    Hi Albert,

    have you considered using a phase detector like the AD8302 ?

    http://www.analog.com/AD8302

    Also a PFD integrated in PLLs could also be used, look at www.analog.com/PLL

    An analog multiplier or a demodulator are also other options.

    Good luck with your design, you may want to browse ADI's web site for more information about these subjects and educational material on it.

    LucaV

  • 0
    •  Analog Employees 
    on Aug 2, 2018 2:39 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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    EZ Admin