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Clean 20Mhz square wave at 45 volts ... possible???

Discussion in 'General Electronics Discussion' started by royalmp2001, May 1, 2017.

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  1. royalmp2001

    royalmp2001

    12
    2
    May 20, 2014
    Hi everyone,
    Been trying to see if anything like this is possible.
    I have got a IRF610 mosfet to switch at 1Mhz at 33 volts but the waveform is not clean and looks more like a distorted triangle wave. Going up to 2Mhz the voltage swing drops completely.
    I know I could use a faster Mosfet...
    I am driving the gate from a 9v function generator via a 100 ohm resistor. The mosfet load is a 750 ohm resistor connected from +33volts to drain and I have a 50Mhz oscilloscope connected across the load. I also have a 15k resistor connected from gate to source.
    Thoughts, anyone.?
    Different resistor values or additional components?
    Thanks
     
  2. Bluejets

    Bluejets

    4,426
    938
    Oct 5, 2014
    Gate capacitance is probably causing grief.
    Maybe use a mosfet driver?
     
  3. Alec_t

    Alec_t

    2,911
    791
    Jul 7, 2015
    Many function generators are intended for driving low current loads only. As Bluejets says, a dedicated FET driver may help, since it is designed to handle high current needed to charge/discharge the gate capacitance quickly.
     
  4. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    I do not think this is possible. You need several harmonics to get anything near a square wave so will need to amplify at least 100MHz.
     
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