Analog-to-Digital Converter Logic Circuit Through Current Reduction
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Solution Overview
Problem
Existing analog-to-digital conversion devices experience accuracy issues due to through current between the power supply node and ground node, particularly at low output rates of the comparator, affecting the precision of AD conversion in photoelectric conversion devices.
Innovation Solution
Incorporating a logic circuit with a switch unit and a logic gate unit connected in series between the power supply node and ground node to control current flow, preventing or reducing through current by using a switch unit to manage the conductive state based on control signals, thereby improving AD conversion accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the comparator operates at a low output through rate, then the AD conversion can be performed, but through current occurs between the power supply node and ground node which affects AD conversion accuracy
Solution Approach 1:
The patent extracts and removes the harmful through current path from the circuit by configuring the logic gate unit and switch unit in series between power supply and ground, preventing the direct current leakage that occurs in conventional parallel configurations
Solution Approach 2:
The switch unit acts as an intermediary element that controls current flow between the logic gate unit and ground, enabling precise control to prevent through current while maintaining necessary signal processing functions
2Measurement precision
If the logic gate unit and switch unit are connected in parallel, then the circuit operates simply, but through current flows between power supply and ground affecting conversion accuracy
Solution Approach 1:
The patent segments the logic circuit into distinct functional units (logic gate unit and switch unit) connected in series, separating the signal processing function from the current control function to eliminate through current while maintaining operational simplicity
3Measurement precision
If the logic gate unit and switch unit are connected in series between power supply node and ground node, then through current is prevented, but the circuit configuration becomes more complex
Solution Approach 1:
The patent merges the logic gate unit and switch unit into a single integrated logic circuit block with series connection, combining current control and logic processing functions in one unified structure that prevents through current without requiring separate complex control circuits
Data Source
AI summary
An analog-to-digital conversion device of the embodiment includes a comparator and a logic circuit including a switch unit and a logic gate unit that receives a signal output from a comparator. The logic gate unit and the switch unit are connected to each other in series between a power supply node and a ground node.