Coded data generation or conversion – Converter calibration or testing
Reexamination Certificate
2011-08-09
2011-08-09
Young, Brian (Department: 2819)
Coded data generation or conversion
Converter calibration or testing
C341S155000
Reexamination Certificate
active
07994954
ABSTRACT:
A calibration circuit and method suitable for black level calibration in image processing, the circuit comprising an analogue gain amplifier, an analogue to digital converter; a correction circuit for receiving a digital signal and providing a digital offset signal; and a digital to analogue converter for receiving said digital offset signal and feeding a corresponding analogue offset signal back to the input of said gain amplifier. The calibration circuit is arranged such that the correction circuit and said digital to analogue converter form a feedback loop applying an offset to said input signal and said correction circuit includes an inverse gain circuit for applying an inverse gain to a signal within said correction circuit prior to said digital to analogue converter. Preferably the inverse gain applied is such that the total loop gain does not deviate too far from unity.
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Boomer Alastair Mark
Lesso John Paul
Dickstein & Shapiro LLP
Wolfson Microelectronics plc
Young Brian
LandOfFree
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