Appeal No. 2002-2276
Application No. 09/472,702
proportional reference current value Isink. This Isink value is
compared with the current output from OTA 504 at the input of
feedback circuit 508 which operates to drive the OTA 504 output
current to be equal to the reference value Isink (Chambers, column
3, lines 27-35). Further, the reference current source elements
505 and 502 are connected to feedback loop 508 through D/A
converter 506.
In view of the above discussion, since all of the claimed
limitations are present in the disclosure of Chambers, the
Examiner’s 35 U.S.C. § 102(b) rejection of claims 1, 20, and 21
is sustained.
We also sustain the Examiner’s 35 U.S.C. § 102(b) rejection,
based on Chambers, of appealed claims 11 and 12 which specify
that the claimed circuit is an input stage for a filter.
Appellants’ arguments to the contrary notwithstanding, we find
clear disclosure in Chambers, as pointed out by the Examiner
(Answer, page 6), of the use of the transconductance setting
circuit illustrated in Figure 5 as an input stage of a filter as
illustrated in Figure 6.
Turning to a consideration of the Examiner’s 35 U.S.C.
§ 103(a) rejection of claims 2-4 based on the combination of
Chambers and Luo, we sustain this rejection as well. With
6
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007