L-C low pass filter correlator
First Claim
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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 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.
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Abstract
An L-C low pass filter correlator circuit for removing noise from an image signal produced by a solid state imaging device such as a CCD sensor.
13 Citations
9 Claims
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1. A correlator circuit for removing noise from a signal, comprising:
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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 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification