right.
The problem is you need a low impedance to drive the gate of Q1. By adding the buffer stage you put a stage with low output impedance to drive Q1 in front of Q1, and this buffer could be driven by a higer input impedance than Q1 because it supplys less current at its output.
Please hit me if this is wrong, i hope someone of the skilled people will look into this thread sometimes.
The problem is you need a low impedance to drive the gate of Q1. By adding the buffer stage you put a stage with low output impedance to drive Q1 in front of Q1, and this buffer could be driven by a higer input impedance than Q1 because it supplys less current at its output.
Please hit me if this is wrong, i hope someone of the skilled people will look into this thread sometimes.
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