A common passive logic component of optimistic and damaging logic, made on only one transistor, is proposed. The logic component has no less than two inputs, in addition to three outputs: an OR, an XOR, and an AND, working concurrently. Examples of utilizing such a tool as a part of a logic component “ONLY ONE OF TWO”, in addition to a part of an RS set off, are given.
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In fashionable electronics, there are virtually no publications associated to the creation of common logic components. Under is an outline of a brand new common passive logic component of optimistic and damaging logic, made on only one transistor.
The common logic component (Determine 1) accommodates just one bipolar or field-effect transistor Q1. It’s able to working with out its personal energy provide, it concurrently performs the features of logic components OR, XOR, and AND. It will also be used as a component of optimistic or damaging logic, which considerably expands the probabilities of its utility.
Determine 1 Common logical components of optimistic and damaging logic.
Take into account the operation of the common logic component of optimistic logic (Determine 1). If no management alerts are utilized to the inputs +X1 and +X2, the outputs +Y1 (OR), +Y2 (XOR), +Y3 (AND) have logical zero ranges. The reality desk might be seen beneath (Desk 1).
Desk 1 Reality desk of common logic components of optimistic and damaging logic.
If one of many inputs +X1 or +X2 is provided with a voltage of the “Log. 1” stage, and the second “Log. 0”, then the outputs +Y1 (OR) and +Y2 (XOR) may have “Log. 1” ranges, and the output +Y3 (AND) may have “Log. 0”.
Lastly, if the voltage stage “Log. 1” is utilized to each inputs +X1 and +X2, then the outputs +Y1 (OR) and +Y3 (AND) may have the degrees “Log. 1”, and the output +Y2 (XOR) may have “Log. 0”.
Related processes, however with a minus signal, shall be noticed in the course of the operation of the common logic component of damaging logic.
Let’s contemplate additional the probabilities of utilizing common logical components as a logical component “ONLY ONE OF TWO”.
The logic component “ONLY ONE OF TWO” is a logic component that ensures the passage of solely one of many two alerts from the enter of the component to its corresponding output. If two or extra enter alerts coincide in time, the “ONLY ONE OF THE TWO” component is not going to go any of them to the outputs (Determine 2, Desk 2). The logical component “ONLY ONE OF TWO” is a particular case of the logical component “ONLY ONE OF ALL” [1].
Determine 2 Logical component “ONLY ONE OF TWO”.
Desk 2 The reality desk of the logical component “ONLY ONE OF TWO”.
Determine 3 and Desk 3 present the potential of utilizing two common logic components as an RS-trigger. When a brief rectangular pulse is utilized to the enter X1 or X2, the set off switches its state.
Figures 3. RS-trigger based mostly on two common logic components.
Desk 3 RS-trigger fact desk utilizing two common logic components.
The benefit of the logic components mentioned above is their distinctive simplicity, versatility of use and the flexibility to function in a variety of enter voltages: from one to lots of of volts.
The disadvantages of passive common logic components embody their low load capability, the small risk of their sequential cascading in view of the progressive lack of output voltages.
References
- A. Shustov, A.M. Shustov. Digital Circuits for All, London: Elektor Worldwide Media BV, 2017, 397 p.
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