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Unformatted text preview: i D = I Dss (1 – v GS /V p ) 2 where I Dss is the drain current when gatetosource voltage (V GS ) is zero; and V p is a negative voltage called the GateSource Cutoff Voltage. I Dss and V p are defined in the Date Sheet. The output drain current is related to input gatetosource voltage by the transconductance gain g m , where g m = 2 (I Dss /V p )(1 – V GS /V p ) (in units of mmhos) The circuit requires that R σ have a value of 2.2K. Measure and determine the Qpoint ( , , D GS DS I V V ). Also, from the measured gain (v /v gs ), determine m g and compare to that given on Data Sheet (named forward transfer admittance). Hint: v o =  g m R D v gs , where v gs = v s [5.1K / (510K + 5.1K)] Prelab : Find the Qpoint for the circuit in Fig. (1) assuming that F β =100....
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 Summer '08
 STAFF
 Frequency, Transistor, The Circuit, Bipolar junction transistor

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