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Biasing of Dual Gate Fets
Hi,
Pretty fundamental I know but can someone please explain the steps for setting up bias for a Dual Gate MOSFET. I know I could place a pot on the gate and source for each circuit and play with values but I would like a method that enables me to calculate the values. The main issue is how to determine values for Rs and Gate 2 Voltage. I am using BF998 and want to have a "play" at 5V and 8V supply. The formulae for Id is Id = Idss(1-Vgs/Vp) ^ 2 But Idss is stated as 2-18mA Vp Gate 1 is given as a range from 1-2V Vp gate 2 is given as range from 0.5 to 1.5V If I apply say 4V to G1 and 0V to G2, how do I calculate the voltage at the source to determine Vgs ? Any help much appreciated. Regards David |
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