Adaptive Interface Circuit for High-Active and Low-Active Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing interface circuits require redesign based on whether the input signal from a digital IC is high active or low active, leading to increased development costs, as they fail to consider the polarity reversal needed for elements operating with either high or low active control signals.
Innovation Solution
An interface circuit with a controller that determines whether the input signal is high active or low active, adjusting the output signal accordingly by being in phase or reversed in polarity, using a polarity controller and level shifter to handle signals with varying reference potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the interface circuit is designed to handle both high active and low active control signals, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The interface circuit is designed with a universal structure that can handle both high active and low active control signals through a single circuit configuration. The circuit uses a level shifter and polarity controller that automatically adapt to the input signal type, eliminating the need for separate circuit designs for different signal types.
Solution Approach 2:
The interface circuit incorporates dynamic elements including a polarity controller that can switch between inverting and non-inverting modes based on the input signal characteristics. The circuit automatically detects whether the input is high active or low active and adjusts its operation accordingly, providing adaptive functionality within a single static circuit design.
2Manufacturing precision
If separate interface circuits are designed for high active and low active control signals, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The patent merges the functionality of separate high active and low active interface circuits into a single unified circuit design. The level shifter and polarity controller are combined in one circuit block that processes both signal types, reducing the total number of designs from two to one while maintaining manufacturing precision through careful circuit design.
Solution Approach 2:
A single interface circuit design is created that serves multiple purposes by handling both high active and low active control signals. The circuit uses universal components and a configurable polarity controller to achieve accurate signal level conversion for different signal types without requiring separate specialized designs.
3Ease of operation
If the interface circuit automatically detects and adapts to the input signal type, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The interface circuit is designed to automatically detect the type of input signal (high active or low active) and self-adjust its operation without external intervention. The polarity controller automatically configures itself based on the input signal characteristics, making the circuit self-sufficient and easy to operate while minimizing the need for external control mechanisms.
Solution Approach 2:
The circuit incorporates implicit feedback mechanisms where the polarity controller monitors the input signal characteristics and automatically adjusts its inversion state accordingly. This feedback-based automatic adaptation simplifies operation by eliminating the need for manual configuration while using relatively simple control logic.
Data Source
AI summary
An interface circuit serves to receive an input signal VIN having a high level defined as a high potential VIH and a low level defined as a low potential VIL, and output an output signal VOUT having a high level defined as a high potential VOH and a low level defined as a low potential VOL. The interface circuit includes a polarity controller configured to control the output signal VOUT to be in phase in level with the input signal VIN or to be reversed in polarity with respect to the input signal VIN, depending on whether the high potential VIH or the low potential VIL is a GND potential.