Vout of MAX2606

Discussion in 'General Electronics Chat' started by dumindu89, Aug 5, 2012.

  1. dumindu89

    Thread Starter Member

    Oct 28, 2010
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    According to the datasheet of MAX2606, Absolute maximum rating for OUT+, OUT- to GND -0.3V to (Vcc+0.6V).

    And

    Vout (p-p) (differential) = 2x1mA[(1kΩxRload)/(1kΩ+Rload)

    I implemented the following circuit (both C2 and C3 are 2.2nF and other values are same as in the diagram) and get the single ended output and measured using the oscilloscope.

    [​IMG]

    Unfortunately the output peak to peak voltage is just 300mV. (Vcc = 4.5V) :(

    Why I can't get at output peak to peak voltage least up to 2.5V?

    Please help me, I want to input the output of this to a 74F14 schmmit trigger IC.
    Any suggestions please?
     
  2. bertus

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    Apr 5, 2008
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    Hello,

    Are you sure it is the MAX2606?
    When I look at MAXIM, the MAX2606 is a RF power detector.

    Bertus
     
  3. dumindu89

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    Oct 28, 2010
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    Last edited: Aug 5, 2012
  4. bertus

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    Hello,

    I made the mistake in the search.
    In the datasheet is given an output power of -10 dBm.
    This will translate into a pp voltage of 0.1 volts into 50 Ohms.

    Bertus
     
  5. dumindu89

    Thread Starter Member

    Oct 28, 2010
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    I need at least up to 2.5 Volts(p-p).
    How can I get this output? What is the easiest way?
    I already tried to add an transistor amplifier (2N2222, fT -> 250MHz) to get an amplified voltage around 2.5V @ 100 MHz. (Vcc for the amplifier was 5V)But it didn't work. I think I need a transistor with higher fT and I already ordered a transistor; BFR520 which is fT = 9GHz. It will take probably a week for the delivery.
    But i need a quicker solution.
    If I get the differential output can I achieve a higher voltage? or any other solutions?
     
  6. bertus

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    Last edited: Aug 5, 2012
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  7. dumindu89

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    Oct 28, 2010
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    Nope, i didn't try.
    But Most probably these RF transformers may not available here in local market. :(
    Anyway, what is called as "CT"?

    Can I achieve the desired output voltage if I used higher Vcc (let's say 9V instead of 5V) only for the 2N2222 transistor amplifier circuit (and applying 5V as Vcc for the VCO ) and if do the calculations to choose the resistor values ?
    Is there a probability damage the VCO which has a absolute maximum rating of 5.5V?
     
  8. bertus

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    Hello,

    CT means center tap, the transformer has a number of turns with a tap in the middle.

    You can NOT run the VCO on a higher voltage as 5.5 Volts.

    Bertus

    PS did you see the amplifier schematics in my last post?
     
  9. dumindu89

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    Oct 28, 2010
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    I will check them now. :)
     
  10. dumindu89

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    Oct 28, 2010
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    Well. None of them are available in NI multisim or Proteus ISIS simulators to simulate them. :( Hope the schematics are useful for the transistors that I already ordered too.

    I already ordered BFR93A and BFR520. Can you confirm that they are suitable for my purpose? :)
     
  11. bertus

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  12. dumindu89

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    Oct 28, 2010
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    How did you get 0.1V pp voltage for 50 ohms. It is 0.07 V. Isn't it?
     
  13. bertus

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  14. dumindu89

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    Oct 28, 2010
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    OK. I have few W13-1TL wide band CT transformers which has an impedance ratio of 1:13.
    Is it possible to input 100mV(p-p) and get a output around 3.3V (p-p) using these transformers?
    This amplified output is going to a FPGA which accept LVTTL inputs. Since the FPGA has schimitt trigger inputs, I just want to amplify and use a clamping circuit to send it to the FPGA.
     
    Last edited: Sep 17, 2012
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