A bypass capacitance is connected to a node between first and second
self-bias resistances connected in series between an input and an output
of an inverter. The bypass capacitance accommodates changes in the output
voltage of the inverter to suppress the feedback effect from the output
side to the input side of the inverter. That is, the bypass capacitance
plays the role of suppressing a decrease in the input impedance by the
Miller effect.