Appeal No. 2001-2018
Application No. 08/668,114
comprises a series arrangement of network elements. Independent
claim 13 is representative of the embodiment wherein the
quadrature demodulator has a phase shifting network that
comprises a parallel arrangement of network elements.
Independent claim 12 is reproduced as follows:
12. A quadrature demodulator for demodulating an
intermediate frequency signal obtained from an angle modulated
radio frequency signal, the quadrature demodulator having a first
branch, a phase shifting network in a quadrature branch, and a
multiplier means, said first branch and said phase shifting
network being coupled to said multiplier means, and wherein said
phase shifting network comprises a series arrangement of a first
resistor and a first capacitor, said series arrangement being
coupled to a first inductor, a junction of the series arrangement
and the first inductor being an output of the phase shifting
network providing a quadrature signal and wherein said junction
is directly connected to an input of said multiplier means,
whereby the first resistor provides a damping such that an
overall quality factor of the phase shifting network is
substantially smaller than a quality factor of the inductor.
The examiner relies on the following references:
Kimyacioglu 4,866,397 Sep. 12, 1989
Worsham, Jr. 5,414,385 May 09, 1995
Nilsson, “Electric Circuits”, Addison-Wesley Publishing
Company, Third Edition (May 1990), pp. 393-394.
Claims 2 and 8-13 stand rejected under 35 U.S.C. 103 as
unpatentable over Worsham in view of Kimyacioglu and Nilsson.
Reference is made to the briefs and answer for the
-2–
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