Appeal No. 97-2993 Page 2
Application No. 08/363,133
The invention is directed to a passive, L-C low pass
filter double correlator circuit for eliminating noise from a
video signal read out from a CCD image sensor.
Independent claim 1 is reproduced as follows:
1. A correlator circuit for removing noise from a
signal, comprising:
an input section for receiving an analog signal having a
period including a first interval with a first signal value and
a second interval with a second signal value, said input
section including a series capacitor and parallel input
resistor;
a passive, double correlating low pass filter section
coupled to said input section and including at least one series
inductor, parallel capacitor (L-C) low pass filter section; and
an output section coupled to said low pass filter section
for outputting an output analog signal across an output
resistor, said output signal being free from noise and having a
signal value which is a function of the difference between said
first signal value and said second signal value.
The examiner relies on the following references:
Ichida et al. (Ichida) 4,220,967 Sep. 2,
1980
Smith 4,287,441 Sep. 1,
1981
Sedra, A.S., et al. "Microelectronic Circuits." Third edition
(1990), pp. 762-774.
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