Appeal No. 2006-0380
Application 10/445,783
Like the appellants’ pull-up and pull-down transistors,
there necessarily is a delay when McClure’s pull-up and pull-down
transistors turn off. Because McClure’s feedback circuit
(figure 2), like that of the appellants (figure 1), prevents the
pull-up and pull-down transistors from being on at the same time,
then like the appellants’ feedback circuit, McClure’s feedback
circuit necessarily provides a delay signal.
We therefore are not convinced of reversible error in the
examiner’s rejection of the appellants’ claims over McClure.
Accordingly, we affirm the rejection over that reference.
Rejection over Nolan
Nolan discloses a comparator output controlled circuit
comprising 1) a break before make circuit (104) having a NAND
gate (216), a NOR gate (226) and inverters (218, 220, 222, 228,
230 and 232), 2) a slew rate control circuit (106) having two
capacitors (236 and 238) and a resistor (239),1 and 3) an output
buffer (108) having a PMOS driver (240) and an NMOS driver (241)
1 “The slew rate is approximately equal to the current from either the NAND gate
216 or NOR gate 226 divided by the capacitance 236 or 238 respectively” (col. 5, lines
7-9).
4
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