The potential of making a common analog-to-digital multiplexer-demultiplexer is proven.
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As is thought, a multiplexer and a demultiplexer is an digital gadget designed for selective sign transmission from considered one of a number of inputs to at least one output, or, quite the opposite, sign transmission from one enter to considered one of a number of outputs. Channel switching is carried out by digital indicators provided to the management inputs.
First, let’s take into account the operation of a management node containing key parts managed by digital enter indicators. Determine 1 reveals an instance of such a node based mostly on discrete parts comparable to bipolar or field-effect transistors; or utilizing two “NOT” logic parts. When making use of to the enter (Inp) of such a node, indicators of the extent “Log. 1»/«Log. 0” the output sign ranges Out1 and Out2 are switched. To modify, for instance, 4 channels, it’s obligatory to make use of two comparable management nodes.
Determine 1 Management node utilizing discrete parts comparable to bipolar or field-effect transistors.
Determine 2 reveals {the electrical} circuit of the sign transmission channel switching unit, made utilizing two management items, Determine 1, in addition to diode-resistive parts. The indicators from the ABCD outputs are despatched to the corresponding ABCD management inputs of analog switches, Determine 2.
Determine 2 Electrical diagram of the analog change management unit utilizing discrete parts.
When digital indicators of the extent “Log. 1” or “Log. 0” are utilized to the inputs, X1 and/or X2 of the management nodes implements 4 mixtures of selective look on the outputs of the ABCD ranges “Log. 1”. The inputs and outputs of analog switches have the property of reversibility, which permits the gadget for use each as a multiplexer and a demultiplexer.
Determine 3 reveals a variant of the management unit for analog switches from a set of logic parts “NOT” and “2AND”.
Figures 3 Electrical diagram of the analog change management unit utilizing logic parts.
To have the ability to disable the passage of any indicators from the enter to the output of the gadget, or vice versa, the scheme proven in Determine 2 could be supplemented with the operate of normal disconnection of the passage of indicators, Determine 4. When an Inhibit sign of the “Log. 1” stage is utilized to the enter, the transistor Q opens and shunts the management inputs of the analog switches ABCD via the diodes.
Figures 4 Electrical diagram of the gadget for normal disconnection of indicators passing via all switching channels.
Determine 5 reveals the doable pin association of the common analog multiplexer/demultiplexer chip, its schematic illustration, and reality desk.
Determine 5 Doable pin structure of the common analog multiplexer/demultiplexer chip, its schematic illustration, and the reality desk.
Determine 6 demonstrates the potential of utilizing such a tool as a multiplexer when indicators from 4 sources are fed to the ABCD inputs. When digital management indicators are utilized to inputs X1 and X2, one of many indicators taken from sources E1–E4 will go to the output Y of the gadget.
Determine 6 Utilizing a common analog multiplexer/demultiplexer as a multiplexer, its graphical designation, equal circuit, and reality desk.
Determine 7 reveals the choices for utilizing a common analog of a common multiplexer/demultiplexer as a demultiplexer.
Determine 7 Utilizing a common analog multiplexer/demultiplexer as a demultiplexer, its graphical designation, equal circuit, and reality desk.
Determine 8 reveals an instance of utilizing a tool for selectively enabling/disabling info transmission channels from sources E1–E4 to the outputs/inputs of ABCD.
Determine 8 Examples of utilizing a common analog multiplexer/demultiplexer to regulate the passage of indicators via one of many channels concerned.
The described gadget can be utilized for switching each analog and digital indicators of optimistic polarity, nevertheless, with a slight enchancment of the gadget, it may be transformed to change indicators of each optimistic and destructive polarity.
Michael A. Shustov is a physician of technical sciences, candidate of chemical sciences and the creator of over 800 printed works within the subject of electronics, chemistry, physics, geology, drugs, and historical past.
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