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LMH2110: LMH2110 - 20- 6000MHz Operating

Avi Netanel
Prodigy 40 points
Part Number: LMH2110
Other Parts Discussed in Thread: LMH2120

Hi,

I would like to use LMH2011 on my new card, to detect  signals in the full  20 -6000MHz Band

I need  to know please

1. Is the LMH2011 recommended for new design ?

2. Is there any need for element matching for wide band (20 -6000MHz)  ?

3. Can I get E.V.B?

Best Regards!
Avi

  • 0
    TI__Genius 12780 points

    Hi Avi,

    Just to make sure, you are referring to the part LMH2110?

    1. Yes

    2. The LMH2110 has an input frequency a range of 50MHz to 8GHz. The LMH2120 has an input frequency range of 50 MHz to 6 GHz (is this what you are looking for?). In general, there are not external components required, but you can add a low pass filter on the Vout pin to reduce noise. Please see page 27 of the datasheet for an application that would require an additional component (resistor divider at RF input).

    3. Yes, the evaluation board is available here.

    Best Regards,

    Dan

  • 0 in reply to dBrock
    Prodigy 40 points

    Thank you very much Dan!

    2. In figure 7 you can see that the RF input impedance is vary significantly over the frequency, so i am a little confused, according to figure 7 it is seem like it is not matched up to 6GHz 

    Best Regards!
    Avi

  • 0 in reply to Avi Netanel
    Prodigy 40 points
    Hi Dan, I would appreciate it if you could answer my question, it's very urgent.

    Best Regards!
    Avi
  • 0 in reply to Avi Netanel
    TI__Genius 12780 points

    Hi Avi,

    My apologies, but I'm not certain as to what the question is. The impedance does change as frequency increases.

    Best Regards,

    Dan

  • 0 in reply to dBrock
    Prodigy 40 points

    Hi Dan,

    According figure 7 the impedance at high frequency is not 50 ohm so how the LMH2110 can be matched to 50 ohm at high frequency without matching elements ?

    Best Regards!
    Avi

  • 0 in reply to Avi Netanel
    TI__Genius 12780 points

    Hi Avi,

    If the LMH2110 will be operated where the standard impedance deviates, there must be matching elements used to compensate. Please see the Applications section (8.2.2) on pages 27 and 28 of the data sheet.

    This shows how you can use a series resistor to provide attenuation, but the concept also relates to a matching network. You will also need to consider compensation for the capacitive response (-X) as well.

    Best Regards,

    Dan