Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1996-02-06
1998-04-07
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327 95, 327551, 348241, 348243, H03K 508, H04N 5217
Patent
active
057368864
ABSTRACT:
A method and apparatus for removing low frequency noise and any offsets common to a plurality of samples of a signal, for calibrating an offset level to be added to the signal to reference the signal to a desired reference level at an output of the apparatus, and for clamping an input voltage level to the apparatus to a desired voltage within an operating range of the apparatus. The apparatus includes a correlated double-sampling circuit which takes a first sample and a second sample of the analog signal, takes a difference between the first sample and the second sample to remove low frequency noise and any offsets common to both samples and which outputs a difference signal. In addition, the apparatus includes a black level correction circuit which adds an offset level to the difference signal to calibrate the offset level to be added to the difference signal so that the difference signal is at a desired reference level at an output of the apparatus. Further, the apparatus includes a clamping circuit which clamps a voltage at the output of the correlated double-sampling circuit to a desired voltage level at the input to the correlated double-sampling circuit and within the supply range and operating range of the apparatus.
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patent: 5517240 (1996-05-01), Fukatsu
Mangelsdorf Christopher W.
Nakamura Katsufumi
Analog Devices Inc.
Callahan Timothy P.
Englund Terry L.
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