Multiple-input-detector

This circuit determines whether multiple inputs in a digital input group are active. It provides a digital measurement of the number of active inputs and allows for the establishment of a threshold for majority-decision applications. This means it can assess whether the number of active inputs is greater than, less than, or equal to a value between 1 and 15. Additional inputs can be monitored by cascading the adders. Each binary adder, IC1 and IC2, consists of two full adders (FAs). Each FA monitors three input lines and produces a 2-bit output that represents the number of active inputs. IC3 and IC4 sum the outputs of two FAs plus an additional input line to individually measure how many inputs are active in a group of seven. Likewise, IC5, by monitoring the 3-bit outputs of IC3 and IC4 along with one more input, measures how many inputs are active in a group of 15. The OR gate, IC6, indicates whether more than one input is active.

The circuit utilizes a structured approach to assess the activity of multiple digital inputs, making it particularly useful in applications requiring majority voting or threshold detection. The design incorporates two binary adders, IC1 and IC2, which each contain two full adders. Each full adder is responsible for evaluating three input lines, allowing for a detailed output that effectively categorizes the number of active inputs into a binary format.

The cascading nature of the adders enables the system to expand its input monitoring capability. By connecting additional adders, the circuit can accommodate a larger number of inputs without sacrificing performance. The outputs from the full adders are combined in IC3 and IC4, which aggregate the results of two full adders and an additional input line, thus extending the monitoring capabilities to a total of seven inputs.

IC5 further enhances the circuit's functionality by processing the 3-bit outputs from IC3 and IC4, alongside one more input, to determine the activity status of a total of 15 inputs. This layered approach to input measurement ensures that the circuit can effectively handle varying numbers of active inputs and provide a clear digital output.

Finally, the inclusion of the OR gate, IC6, serves as a straightforward indicator of whether more than one input is active. This feature is crucial for applications that require immediate feedback on the status of multiple inputs, enabling quick decision-making based on the digital output provided by the circuit. Overall, this circuit design is versatile and can be adapted to various digital input monitoring applications, making it a valuable tool in electronic systems requiring input activity assessment.This circuit determines whether more than one input in a group of digital inputs is active. It provides a digital measure of the number of active inputs, and it allows you to establish a threshold for majority-decision applications. That is, whether the number of active inputs is more than, less than, or equal to a value between 1 and 15.

You can monitor more inputs by cascading the adders. Each binary adder, IC1 and IC2, forms two full adders (FAs). Each FA monitors three input lines and generates a 2-bit output representing the number of inputs active. IC3 and IC4, by summing the outputs of two FAs plus an input line, individually measure how many in a group of seven inputs are active. Similarly, by monitoring the 3-bit outputs of IC3 and IC4 plus one input, IC5 measures how many in the group of 15 are active.

The OR gate, IC6, simply indicates whether more than one input is active. 🔗 External reference