Coded data generation or conversion – Converter calibration or testing
Reexamination Certificate
2009-12-16
2011-10-11
Nguyen, Linh V (Department: 2819)
Coded data generation or conversion
Converter calibration or testing
C341S118000, C341S119000, C341S121000, C341S143000, C341S155000
Reexamination Certificate
active
08035538
ABSTRACT:
A sigma-delta converter suitable for measuring a photocurrent comprises an input node adapted to receive a current to be measured (Imeas), a capacitor connected to the input node, a clocked comparator coupled to the input node and to a reference voltage Vrefat respective inputs, and a switchable current source connected to the input node which conducts a reference current Irefwhen switched on. The converter is arranged in a sigma-delta configuration, with the current source switched on to pull down the voltage (VCMP) at the input node when the comparator output toggles due to VCMPincreasing above Vref, and to be switched off when the comparator output toggles due to VCMPfalling below Vref, such that the comparator output comprises a digital bitstream which varies with Imeas.
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Daly Michael P.
Edelson Lawrence H.
Roessig Trey A.
Analog Devices Inc.
Koppel, Patrick, Heybl & Philpott
Nguyen Linh V
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