Redundant decoder

Details Redundant decoder Redundant decoder

1985-09-13

1988-02-09

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

365200, H03M 700

Patent

active

047244224

ABSTRACT:
A redundant decoder for use in a predecoded memory scheme includes a plurality of predecoding circuits each having an output and each having inputs coupled to selected address signals. The outputs of the predecoding circuits are applied to the inputs of a smaller group of decoding circuit. In addition, the outputs of the predecoding circuits are coupled to the gate electrodes of one of a plurality of series coupled field effect transistors each having a laser blowable fuse coupled across its source drain path. Should one of the decoding circuits prove to be operating improperly, is only necessary to blow the fuses across the individual field effect transistors whose gate electrodes are coupled to the predecoding circuit outputs which served as inputs to the bad gate. In this manner, the output of the stack will go high only when the output of the bad decoding circuit should go high.

REFERENCES:
patent: 4590388 (1986-05-01), Clemons

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