Exar Corporation

Charles Andrew Rogers

Bhupendra K Ahuja

Richard Leigh Gower

J Antonio Salcedo

Jose Antonio Salcedo

Raphael Horton

Srinivas N Neti

A method and apparatus for adjusting, on a pixel-by-pixel basis, the gain and offset in an AFE as the pixels are sequentially processed. Although the method can be used for any purpose, it is directed in particular to light source non-linearity, such as edge effects of a scanner. A unique clocking method clocks the gain and offset values into the register at a higher clock rate than the image sampling rate.

Pixel-by-pixel digital control of gain and offset correction for video imaging

An improved offset correction circuit for an image digitizing system having a correlated double sample and hold circuit, a programmable gain amplifier and an analog-to-digital converter. The output of the analog-to-digital converter is provided to a dual offset correction circuit. The dual offset correction circuit provides both first and second correction values as feedback signals. In one embodiment, the first correction value is a coarse correction which is applied prior to amplification by the programmable gain amplifier. The second correction value is a fine correction offset which is applied as feedback after the programmable gain amplifier.

Black level offset calibration system for CCD image digitizer

A programmable delay in an AFE of an imaging system which can vary both the pulse position and the pulse width. The pulse width and position are controlled by providing separate programmable delay circuits for the rising and falling edges of the desired timing signal. Combining logic then combines the outputs of the two delay circuits to produce an output clock with separately delayed rising and falling edges.

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San Jose, CA, United States of America

Charles Andrew Rogers