G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 7/50 (2006.01)
Patent
CA 2055882
A first switch (e.g. semi-conductor) becomes conductive when at least one of a pair of binary inputs to be added is a binary "1". A second switch (e.g. semi-conductor) becomes conductive when there is a carry of a binary "1" from a preceding stage. The semi-conductors are in series with an output line to provide a particular potential on the output line when the semi-conductors are simultaneously conductive. This potential is introduced as a binary carry output to a switch in the next stage corresponding to the second switch. The carry switch in the next stage is an n-channel semi-conductor when the carry switch in the previous stage is a p-channel semi-conductor. A logical network also produces a signal when both of the binary inputs are a binary "1". This signal causes a third switch (e.g. semi-conductor) to become conductive and to produce the particular voltage on the output line whether or not the particular voltage is produced on the output line by the operation of the first and second switches. The voltage on the carry output line is thereafter reset to a second particular value as by a reset signal from a fourth switch (e.g. semi-conductor). A fifth switch (e.g. semi-conductor) also simultaneously receives a reset voltage to reset the common node between the first and second switches to the particular value. The first and second switches in the next stage then respectively respond to a binary "1" in at least one of the next pair of binary inputs and to the carry output from the preceding stage in the manner described above.
Borden Ladner Gervais Llp
Brooktree Broadband Holding Inc.
Lewyn Lanny L.
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