Digital Input Circuit With Cross-Stabilized Current Compensation
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Solution Overview
Problem
Digital input circuits face challenges in minimizing power loss and maintaining reliable detection of high and low level states, especially in the high level region, due to non-ideal current output behavior and increased input current as voltage rises, which is exacerbated by the need for voltage stabilization that compromises output voltage stability and increases power dissipation.
Innovation Solution
A digital input circuit design featuring two subcircuits connected in series, where the current flowing through the voltage stabilizing element of one subcircuit is stabilized by the current from the other subcircuit, effectively compensating for non-ideal current output behaviors and maintaining constant currents in the high level region, thereby minimizing power loss and ensuring reliable state detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage stabilizing elements are used to maintain reliable detection of high and low level states, then detection reliability is improved, but power dissipation increases due to non-ideal current output behavior
Solution Approach 1:
The patent implements a feedback mechanism where the current through the voltage stabilizing element is stabilized by the current from the other subcircuit. This feedback loop compensates for non-ideal current output behavior, maintaining constant currents in the high level region while ensuring reliable state detection without excessive power dissipation.
Solution Approach 2:
The patent introduces an intermediary current stabilization mechanism between the two subcircuits. The current from one subcircuit acts as an intermediary to stabilize the current through the voltage stabilizing element of the other subcircuit, effectively decoupling the detection reliability requirement from the power dissipation penalty.
2Loss of energy
If current stabilization is implemented to minimize power loss in the high level region, then power loss is reduced, but circuit complexity increases due to additional subcircuits
Solution Approach 1:
The patent merges two subcircuits into a single integrated structure where they share common elements and interact through their respective voltage stabilizing elements. This merging allows the current stabilization function to be achieved while keeping the overall circuit compact and avoiding excessive complexity that would result from completely separate stabilization circuits.
Solution Approach 2:
The patent segments the digital input circuit into two functional subcircuits, each with its own voltage stabilizing element. This segmentation allows independent optimization of each subcircuit's current output behavior, enabling effective power loss minimization through the interaction of the two segments while maintaining manageable complexity.
3Power
If input voltage increases in the high level region, then signal strength is improved, but input current increases leading to higher power consumption
Solution Approach 1:
The patent changes the operational parameters of the voltage stabilizing elements by stabilizing their current through the feedback mechanism from the other subcircuit. This parameter change allows the circuit to maintain constant current operation in the high level region regardless of input voltage increases, thereby maintaining signal strength while preventing the corresponding increase in power consumption that would normally occur.
Data Source
AI summary
A digital input circuit adopts a first state when an input signal is below a lower threshold value and adopts a second state when the input signal is above an upper threshold value. The digital input circuit comprises first and second subcircuits that exhibit a non-ideal current output behavior at least in the second state, and each comprises a current stabilizing element with a driving circuit and a voltage stabilizing element. The first and second subcircuits are configured such that, at least in a portion of the second state, an electric current flowing through the first subcircuit's voltage stabilizing element consists substantially of a stabilized current of the second subcircuit, and an electric current that flows through the second subcircuit's voltage stabilizing element consists substantially of a stabilized current of the first subcircuit, such that the non-ideal current output behavior of the first and second subcircuits compensate for each other.