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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


    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?
  2. Bluejets


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


    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


    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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