Appeal No. 2000-0312
Application No. 08/610,007
1. Analog signal conditioning circuitry comprising:
an amplifier having a first input receiving an analog input
signal defined by a first ac signal component due to a driving
force and a first dc offset component independent of the driving
force, a second input receiving a reference signal and an output
providing an analog output signal defined by an amplified
representation of the analog input signal and said reference
signal; and
a feedback circuit having a periodic clock signal
associated therewith, a first input coupled to said amplifier
output, a second input receiving said reference signal, and an
output connected to said first input of said amplifier for
providing an analog feedback signal thereto, said feedback
circuit incrementally increasing said analog feedback signal
each clock cycle that said analog output signal exceeds said
reference signal and incrementally decreasing said analog
feedback signal each clock cycle that said reference signal
exceeds said analog output signal, said analog feedback signal
compensating for variations in said first dc offset component of
said analog input signal to thereby maintain the amplified
representation of said first dc offset component of said analog
output signal within a predefined range of said reference
signal.
The reference relied on by the examiner is:
Masuda 4,356,450 Oct. 26,
1982
Claims 1 through 6, 8 through 14 and 16 through 22 stand
rejected under 35 U.S.C. § 103(a) as being unpatentable over
Masuda.
2
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