Overlapped signal transition counter

Details Overlapped signal transition counter Overlapped signal transition counter

H - Electricity

03

K

328/56

H03K 21/02 (2006.01) G06K 15/16 (2006.01)

Patent

CA 1047607

OVERLAPPED SIGNAL TRANSITION COUNTER Abstract A counter circuit counts all transitions of two or more overlapped out of phase bi-level signals under control of a start signal by combining the input signals via an exclusive OR circuit into a single signal having the transitions of all input signals. The levels of this single signal are applied to a polarity hold circuit and the level present upon the occurrence of an asynchronously occurring start signal is stored therein. The polarity hold circuit provides a pair of gating signals to a logical AND/OR network having an output containing both the positive and negative transitions of the single signal. The detected transitions are fed into a binary counter whose first stage consists of the AND/OR network.

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