(A) For an N- Channel JFET when Gate Source Voltage changes from -2.4 Volt to -2.9 Volt the Drain Current changes from 3.8 mA to 3 mA. Given the circuit parameters Rp = 2.2 kohm; RG = 5 Mohm; find the (0) trans conductance and the (ii) maximum trans conductance at VGs = -2.7 Volt. (B) Also find Vps and Ip ? 916 V Rp OD loss = 10 mA Vo=5V RG
KVL and KCL
KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.
Sign Convention
Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.
For the given N channel JFET
Gate to source voltage (VGS ) = -2.4 to -2.9 V
Drain current (ID) = 3.8mA to 3 mA
RD = 2.2 k Ohm
RG = 5 M Ohm
Transconductance and maximum transconductance is calculated as shown below using the basic definition of transconductance
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