how does the self-biased FET\'s work and why? why is it that a high input impeda
ID: 1933770 • Letter: H
Question
how does the self-biased FET's work and why? why is it that a high input impedance (Zi) is a desirable property to have?Explanation / Answer
--->(take into consideration the standard self biased FET circuit) This is the most common method for biasing a JFET. Self-bias circuit for N-channel JFET is shown in figure. Since no gate current flows through the reverse-biased gate-source, the gate current IG = 0 and, therefore,vG = iG RG = 0 With a drain current ID the voltage at the S is Vs= ID Rs The gate-source voltage is then VGs = VG - Vs = 0
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