At cut-off, the JFET channel is ___________(a) at its widest point(b) completely closed by the depletion region(c) extremely narrow(d) reverse baisedI had been asked this question in semester exam.I'm obligated to ask this question of Transconductance Amplifiers in portion Differential and Multistage Amplifiers of Electronic Devices & Circuits

At cut-off, the JFET channel is ___________(a) at its widest point(b)

1.	At cut-off, the JFET channel is ___________(a) at its widest point(b) completely closed by the depletion region(c) extremely narrow(d) reverse baisedI had been asked this question in semester exam.I'm obligated to ask this question of Transconductance Amplifiers in portion Differential and Multistage Amplifiers of Electronic Devices & Circuits
Answer» RIGHT option is (B) COMPLETELY closed by the depletion region To explain: At cut off, the JFET channel is completely isolated by the depletion region. Gate connection is completely isolated from the MAIN current carrying channel. At cut-off, VGS is sufficient to cause the JFET to act as an open circuit as the channel resistance is at maximum.

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