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Why is self bias self-correcting?

  • A.More current lowers the drain voltage and reduces the gain
  • B.More current increases the transconductance and the feedback
  • C.More current reduces the channel resistance and the drop
  • D.More current raises the source and reduces the bias

Answer: D

A rise in drain current raises the source voltage, which makes the gate more negative of the source and reduces the current - negative feedback in the bias loop from a single resistor. The drain voltage and transconductance do change but neither closes the loop. It is the same mechanism as an emitter resistor in a bipolar stage, and it works for the same reason.

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