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US 4,394,657 AGranted
Decoder circuit
AssigneeFujitsu Limited
InventorsHideaki Isogai, Yukio Takahashi
Life of this patent
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Abstract
A decoder circuit comprises input gates, a logic circuit for generating an output according to input signals, an output gate for driving a word line, and a current control device for activating the output gate according to the output of the logic circuit.
Claims11
A decoder circuit, operatively connectable to receive a plurality input signals "a.sub.0, a.sub.1, a.sub.2, - - - , a.sub.i " and to a word line, comprising:
- input gates, operatively connectable to receive the plurality of input signals "a.sub.0, a.sub.1, a.sub.2, - - - , a.sub.i ", for generating inverse signals "a.sub.0, a.sub.1, a.sub.2, - - - , a.sub.i " in dependence upon the plurality of input signals "a.sub.0, a.sub.1, a.sub.2, - - - , a.sub.i ";
- a logic circuit, operatively connected to said input gates, for generating an output in dependence upon combined input signals that are the combination signals of said signals a.sub.0 through a.sub.i and a.sub.0 through a.sub.i ;
- an output gate, operatively connected to said logic circuit and operatively connectable to the word line, for selectively driving the word line by the output supplied from said logic circuit;
- and
- current control means, electrically connected between a voltage source and said output gate, for switching a current from said voltage source and activating said output gate.
2 more elements
A decoder circuit for a word line, operatively connectable to receive input bit signals, said decoder circuit comprising:
- an input gate, operatively connectable to receive the input bit signals, for generating gate signals and inverted gate signals;
- a logic gate, operatively connected to said input gate, for generating a logic signal in dependence upon predetermined ones of the gate signals and the inverted gate signals;
- a current switch, operatively connected to said logic gate, for passing current therethrough in dependence upon the logic signal;
- current control means, operatively connected to said current switch at a first node, for controlling current flow in dependence upon the current from said current switch;
- and
- a word line driver, operatively connected to said current control means at a second node, for driving the word line.
3 more elements
Dependencies are inferred from the claim text.