MEHRSTELLIGER CARRY-RIPPLE-ADDIERER IN CMOS-TECHNIK MIT ZWEI TYPEN VON ADDIERERZELLEN.

摘要

The adder cells of the first type receive invertedcarry input signals and drive a non-inverted carry output. The second type receive non-inverted carry input signals and drive and inverted carry output. Each adder cell type has a gate arrangement for two variables for sum and carry generation. Each has an input for one of the two variables. The carry output capacitance is either charged via only one transfer gate transistor or via a series circuit contg. only two transistors, one of which 3 in a gate and the other is formed by a transfer gate. The transfer transistors with source-drain paths in the time-critical carry paths have essentially cover impedance than the remaining transistors without layout geometry limitations.