Offset reduction for fast comparators employing...

Details Offset reduction for fast comparators employing... Offset reduction for fast comparators employing...

H - Electricity

03

G

328/167, 330/31

H03G 3/00 (2006.01) H03K 5/24 (2006.01)

Patent

CA 1211166

OFFSET REDUCTION FOR FAST COMPARATORS EMPLOYING SERIES-CONNECTED, SINGLE-ENDED GAIN STAGES Yusuf A. Hague ABSTRACT A method of operation is provided for a fast compar- ator 10 which contains multiple series-connected, single- ended gain stages 113, 115, 117, 119). High resolution comparison is possible due to the reduction in offset by this method of operating the comparator. The offset of the first gain stage (113) is made to disappear by placing it in an open loop mode prior to the turning on of the successive single-ended gain stages. The errors of successive single-ended gain stages are made to appear of less consequence because they are reduced by the inverse of the open loop gain of the upstream stage.

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