Electrical pulse counters – pulse dividers – or shift registers: c – Shift register
Patent
1996-08-07
1997-12-09
Wambach, Margaret Rose
Electrical pulse counters, pulse dividers, or shift registers: c
Shift register
36471508, G11C 1900
Patent
active
056968035
ABSTRACT:
A CMOS (complementary metal-oxide semiconductor) barrel shifter (40) is implemented using a plurality of cells (41-43, 58) for shifting bits of data. Each of the cells (41-43, 58) has two transistors (44-47, 49-52) and both transistors of each cell are of the same conductivity type. The four transistors (44-47) of two neighboring cells (41,42) are formed using a common active region (60). The layout design of the barrel shifter (40) is such that all of the transistors of one conductivity type are grouped together, and all of the transistors of the opposite conductivity type are grouped together and are formed in a single well region (55).
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Carver Mead, et al., "Introduction to VLSI Systems", pub. by Addison-Wesley Pub. Co., Inc. 1980, Section 5.8 Barrel Shifter, pp. 157-163.
Neil H.E. Weste, et al, "Priciples of CMOS VLSI Design--A Systems Perspective", 2nd Edition, pub. by Addison-Wesley Pub. Co., 1993 by AT&T, pp. 560-563.
Hill Daniel D.
Motorola Inc.
Seddon Ken
Wambach Margaret Rose
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