Appeal No. 96-0517
Application 08/264,473
DECISION ON APPEAL
This is an appeal under 35 U.S.C. § 134 from the
examiner's rejection of claims 14-18, all of pending
application claims, under 35 U.S.C. § 103. We reverse. 2
The invention, a playback circuit for a magnetic head of
the magneto-resistive (MR) type, is said to be an improvement 3
over the prior art playback circuit shown in appellants'
Figure 22, which is described in appellants' specification at
2:24 to 3:20. This playback circuit includes a first-stage
amplifier transistor 22 having its collector connected to one
input of a differential-input gm amplifier 24, which functions
as a voltage-to-current converting amplifier. The other input
of gm amplifier 24 is connected to a source 25 of reference
potential. The output of gm amplifier 24 is connected to one
side of a capacitor 26, the other side of which is connected
to ground. The output of gm amplifier 24 is also connected in
a feedback path to the base of transistor 22. In order to
conserve power, the power for the playback circuit is turned
2The final rejection of claims 15 and 16 under § 112 was
withdrawn in the Answer at 3.
3Brief at 2-3.
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