MESFET operation

Discussion in 'General Electronics Chat' started by Bero, Dec 17, 2014.

  1. Bero

    Thread Starter New Member

    Dec 17, 2014
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    I have a question about MESFET operation. When Vgs=O V and Vds=O V, why I do not observe capacitance at the output ?
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,093
    3,031
    Because you have no method for observing capacitance? Because all 3 pins are tied together?
     
  3. #12

    Expert

    Nov 30, 2010
    16,257
    6,757
    Output compared to where? With which mesfet? In what kind of circuit? With what measuring device?
     
  4. Bero

    Thread Starter New Member

    Dec 17, 2014
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    0
    Hey Guys. Actually I have used VNA for S-Parameter measurements. In S22 I do not observe curve tracing in capacitance region of Smith chart when Vgs=O V and Vds=O V. But The curve traces the capacitive region of Smith chart when Vgs=O V and Vds=2 V.
    The measurement are made by connecting MESFET as a 2-port network and common source configuration. Gate is input port and Drain is output port.
     
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