The potential for making a common analog-to-digital multiplexer-demultiplexer is proven.
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As is understood, a multiplexer and a demultiplexer is an digital gadget designed for selective sign transmission from one in all a number of inputs to 1 output, or, quite the opposite, sign transmission from one enter to one in all a number of outputs. Channel switching is carried out by digital alerts equipped to the management inputs.
First, let’s think about the operation of a management node containing key components managed by digital enter alerts. Determine 1 reveals an instance of such a node based mostly on discrete components corresponding to bipolar or field-effect transistors; or utilizing two “NOT” logic components. When making use of to the enter (Inp) of such a node, alerts of the extent “Log. 1»/«Log. 0” the output sign ranges Out1 and Out2 are switched. To modify, for instance, 4 channels, it’s needed to make use of two related management nodes.
Determine 1 Management node utilizing discrete components corresponding 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 components. The alerts 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 components.
When digital alerts 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 components “NOT” and “2AND”.
Figures 3 Electrical diagram of the analog change management unit utilizing logic components.
To have the ability to disable the passage of any alerts from the enter to the output of the gadget, or vice versa, the scheme proven in Determine 2 will be supplemented with the perform of basic disconnection of the passage of alerts, 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 by way of the diodes.
Figures 4 Electrical diagram of the gadget for basic disconnection of alerts passing by way of all switching channels.
Determine 5 reveals the attainable pin association of the common analog multiplexer/demultiplexer chip, its schematic illustration, and reality desk.
Determine 5 Potential pin format of the common analog multiplexer/demultiplexer chip, its schematic illustration, and the reality desk.
Determine 6 demonstrates the opportunity of utilizing such a tool as a multiplexer when alerts from 4 sources are fed to the ABCD inputs. When digital management alerts are utilized to inputs X1 and X2, one of many alerts taken from sources E1–E4 will move 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 manage the passage of alerts by way of one of many channels concerned.
The described gadget can be utilized for switching each analog and digital alerts of optimistic polarity, nevertheless, with a slight enchancment of the gadget, it may be transformed to change alerts of each optimistic and damaging polarity.
Michael A. Shustov is a physician of technical sciences, candidate of chemical sciences and the creator of over 800 printed works within the area of electronics, chemistry, physics, geology, medication, and historical past.
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