Electronic digital logic circuitry – Function of and – or – nand – nor – or not – Field-effect transistor
Reexamination Certificate
2006-05-16
2006-05-16
Tran, Anh Q. (Department: 2819)
Electronic digital logic circuitry
Function of and, or, nand, nor, or not
Field-effect transistor
C326S037000, C326S041000
Reexamination Certificate
active
07046041
ABSTRACT:
Pseudo-differential multiplexer circuits and methods. The circuit input signals are provided to two similar multiplexers, one of which is driven by true signals and one by the complementary input signals. No matter what the values of the circuit input signals, at least one of the two multiplexers always selects a low value. Therefore, at least one of the two multiplexers has the capability of overcoming a value stored in an output circuit (e.g., a latch) coupled to the output terminals of the two multiplexers. Thus, even when neither multiplexer can provide a high signal at the full value of power high VDD, the output circuit provides the correct output value. The invention also encompasses methods of selecting between circuit input signals by utilizing a pseudo-differential multiplexing technique, e.g., utilizing multiplexer circuits similar to those described above.
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patent: 6121797 (2000-09-01), Song et al.
patent: 6232799 (2001-05-01), Allen et al.
patent: 6621296 (2003-09-01), Carberry et al.
patent: 6768338 (2004-07-01), Young et al.
Cartier Lois D.
Tran Anh Q.
XILINX Inc.
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