Self calibrating dual range a/d converter

Details Self calibrating dual range a/d converter Self calibrating dual range a/d converter

H - Electricity

03

M

H03M 1/18 (2006.01) H03M 1/10 (2006.01) H04N 5/253 (2006.01)

Patent

CA 2087038

2087038 9222962 PCTABS00018 A dual range A/D converter includes a gain matching circuit (60) for balancing the upper end of the transfer curves of the level-dependent dual A/D signal paths of the converter so as to control crossover between the paths. One path (high gain path B) is provided with signal gain that is a nominal multiple of gain applied to the other path (low gain path A). A digital comparator (62) compares the digital code word output of flash A/D converters (12, 10) included in the respective paths, with the output from the high gain path being scaled down to correspond to the output from the low gain path. If a difference is detected, the upper ladder reference of the flash converter (10) in the low gain path (A) is adjusted until the respective gain difference becomes substantially an exact multiple. When this matching is combined with black level correction, which equalizes the lower end of the transfer curves, a fully self-calibrating dual range A/D converter is obtained.

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