Appeal No. 1998-0440
Application No. 08/351,578
negative supply rail. One of the transistors is a PNP bipolar
pull-up transistor, and the other is an n-channel power field
effect push-down transistor, or, more specifically, a DMOS
transistor. Claim 6 is illustrative of the claimed invention,
and it reads as follows:
6. An integrated power audio output stage comprising:
a pair of transistors connected, in series with an output
node, between a positive and a negative supply rail;
a driver stage connected to drive said transistors in phase
opposition;
wherein said pair of transistors comprises a PNP bipolar pull-
up transistor and an n-channel power field effect push-
down transistor;
wherein said output node is connected to a loudspeaker;
wherein said driver stage is an analog differential amplifier.
The prior art references of record relied upon by the
examiner in rejecting the appealed claims are:
Tanizawa et al. (Tanizawa) 4,716,310 Dec. 29,
1987
Kurosawa 2 JP 3-082,216 Apr. 08, 1991
(Japanese Kokai Patent Publication)
2Our understanding of this reference is based upon a translation
provided by the Translations Branch of the Patent and Trademark Office.
2
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