Thus, a high level of fault tolerance is provided which produces the surprising result of enhancing voting circuit reliability. In TMR, three identical logic circuits logic gates are used to compute the same set of specified Boolean function. Since there are an odd number of currents to be steered, the signal levels at nodes D and E are never equal during a steady state condition. The voting circuit of claim 2, said means for isolating comprising a cutable link. Additional embodiments of the invention contemplate using current mode logic CMLemitter coupled logic ECLeliminating the output emitter follower transistors 37 and 39 in the case of current mode logic circuitry; and incorporating the function of differential transistor pair 36 into a feed circuit latch, multiplexer, exclusive OR, etc. The logic cell may be taken out of the voting process by providing a disable signal at terminal TD of transistor When a diagnostic select signal is presented to terminal Es of transistor 52a, differential transistor pair 50 controls voting nodes D and E and, correspondingly, controls the outputs at terminals D' and E'. Element W 24 is also shown as including a differential transistor pair by which the voltage differences between nodes D and E are sensed and amplified and by which a voted output signal is provided at terminal F.
Download scientific diagram | Majority voter logic circuit designed using AND gates Redundancy Based Design and Analysis of ALU Circuit Using CMOS nm. The progression of software systems implementation and development is.
Design simple logic circuits without the help of a truth table. □. Describe how to In the last sections of this chapter, we will extend our knowledge of pro- . will be HIGH only when a majority of the inputs are HIGH.
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Solution. File, Edit, Draw, Scopes, Options, Circuits Current Circuit: Majority Logic. This circuit outputs high if a majority of the inputs are high. Next: 2-Bit Comparator.
Alternatively, defective logic cells may be removed from the signal path as necessary, allowing the remaining logic cells to vote.
Accordingly, a logic circuit having defective logic or voting cells may be "repaired" by eliminating defective cells, once the defective cells have been located by diagnostic testing.
The output voltage F is 1 V BE below the base voltage of transistor A high reliability logic function wherein polling of results, reducing the possibility of spurious responses or indications, thus obtains, thereby providing a failsafe redundant signal pathway.
USA Wired logic voting circuit Google Patents
Semiconductor integrated circuit with a circuit limiting an input voltage to a predetermined voltage. When a logic level signal greater than bias voltage V BB is presented to input V at the base of transistor 34a, constant current I z is steered through transistor 34a to node E.
TOGANO TRACK ALUMNI
|Therefore, the scope of the invention should be limited only by the claims.
Three-input signal section, application to a selector with N inputs and to a poller with N inputs. Since there are an odd number of currents to be steered, the signal levels at nodes D and E are never equal during a steady state condition.
In the case where a majority of logic cells are defective, they may be electrically removed from the circuit, allowing the remaining minority of logic cells to operate and produce the desired results. Views Read Edit View history. The voting scheme employs an odd number of logic inputs T, U, Vsuch that an odd number of currents I xI yI z are steered to the voting nodes. A transistor 53 is coupled to the emitters of differential pair 52 to provide a forced disable of the logical element 61 during test disable mode.
Designing Combinational Circuits
Project Majority of 5: How could you find a majority of the vote if each of five voters has a switch to vote Be able to define a logic circuit using a truth table. In computing, triple modular redundancy, sometimes called triple-mode redundancy, (TMR) is a the more common Hamming code), because triple modular redundancy hardware is faster than Hamming error correction software.
Video: Majority circuit logic software Majority Logic Circuit Tutorial - Basic Logic Gates
A majority logic gate is used to decide which of the circuits' outputs is the correct output.
Archived from the original on During normal operation, data presented to transistor 51a produces a voting signal along lines D and E. Such agreement among two out of three logic elements in a redundant pathway renders the vote of the defective cell insignificant.
Should the diagnostic procedure indicate that a particular cell is defective, that cell may permanently be disabled by blowing fuse F1, which electrically isolates the cell from the rest of the circuit.
Exemplary and alternative embodiments of the invention have been described. Thus, known voting circuits are level intolerant.
NEGREA BOGDAN OLTEANU
|During normal operation, data presented to transistor 51a produces a voting signal along lines D and E.
IBM Journal. In TMR, three identical logic circuits logic gates are used to compute the same set of specified Boolean function.
In other embodiments of the invention, each of the input differential transistor pairs could be replaced with more complex logic functions. In one embodiment of the invention, a wired voting logic circuit employs inverting collector nodes and non-inverting collector nodes of differential transistor pairs coupled as current-mode-logic CML or emitter-coupled-logic ECL gates and connected in a two-out-of-three voting configuration.