Excavating
Patent
1980-06-23
1982-06-08
Malzahn, David H.
Excavating
307 34, 307 39, 365206, H02J 104
Patent
active
043343104
ABSTRACT:
The generation of internal circuit noise due to the switching of differing numbers of bilevel data lines is suppressed by maintaining the energizing current substantially constant with widely varying amounts of current drawn by varying the current drawn by redundant driver circuits, which also generate parity or check signals, to compensate for the difference in current drawn by the designated data driver circuits. The number of redundant driver circuits is reduced by loading the second and further redundant driver circuits for drawing currewnts related to the current drawn by the first redundant driver circuit by succeeding powers of two. Further suppression in internal circuit noise obtains with gating of all driver circuits at the time switching occurs. Control circuitry comprising conventional full adder circuits arranged for expressing the number of data signal lines in a given level is advantageous for controlling the redundant driver circuits and for generating check bits at the same time.
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patent: 3643239 (1972-02-01), Mack et al.
patent: 3678259 (1972-07-01), Kyser
patent: 4068148 (1978-01-01), Nomiya et al.
International Business Machines - Corporation
Malzahn David H.
Roush George E.
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