Appeal No. 2000-1938
Application 08/940,467
voltage UDr for the prior art circuit and a more gradual
transition for Appellants' circuit, which transition the
specification descibes as having a "polygonal" shape P (id. at 8,
ll. 10-15).
Appell ants'
circui t
provides the gradual transition P by employing eight lower-rated
Zener diodes ZD3-ZD10 and connecting a resistor, a capacitor, a
series combination of a resistor and capacitor, or a parallel
combination of a resistor and capacitor in parallel with each of
four of the zener diodes. The effect is
to slightly time-delay the voltage which builds up
across the Zener diode, depending on the rating of the
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