IO Cell Circuit for Suppressing High-Amplitude Sensor Oscillations
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Solution Overview
Problem
Integrated circuits processing oscillating analog signals from inductive-capacitive sensors face failures due to high-amplitude oscillations, which existing solutions like voltage limiting or electrostatic discharge diodes either constrain design flexibility or are costly.
Innovation Solution
An integrated circuit with an input/output cell and control means that suppresses the first oscillation of high amplitude, ensuring the output signal's amplitude is below a threshold compatible with the processing unit's voltage tolerance, using a switch controlled by a main and auxiliary control unit to prevent transmission of high-amplitude oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage limiting is used to protect against high-amplitude oscillations, then processing unit reliability is improved, but design flexibility is worsened
Solution Approach 1:
The auxiliary control unit activates the switch in advance before the high-amplitude oscillation reaches the processing unit. By detecting the oscillation pattern and preemptively opening the switch, the system prevents the harmful signal from reaching vulnerable components while maintaining the ability to transmit normal signals, thus protecting reliability without permanently constraining design flexibility
Solution Approach 2:
The switch state is dynamically controlled based on real-time oscillation detection. The auxiliary control unit continuously monitors the input signal and adjusts the switch state accordingly - open during high-amplitude oscillations, closed during normal operation. This dynamic adaptation allows the system to maintain design flexibility for different operational modes while providing protection only when needed
2Reliability
If electrostatic discharge diodes are used to protect against high-amplitude oscillations, then processing unit reliability is improved, but cost is worsened
Solution Approach 1:
The auxiliary control unit and switch act as intermediary components between the LC sensor and processing unit. Instead of using expensive protective diodes at the processing unit interface, the system introduces a controlled intermediary mechanism that detects oscillations and selectively blocks them, achieving the same protective function at lower cost
Solution Approach 2:
The auxiliary control unit uses the oscillation signal itself to trigger the protective action. By monitoring the input signal characteristics and automatically activating the switch when high-amplitude oscillations are detected, the system provides self-protecting functionality without requiring additional expensive protective components
3Reliability
If the switch is opened to block high-amplitude oscillations, then processing unit reliability is improved, but signal transmission is worsened
Solution Approach 1:
The switch operates periodically based on the oscillation detection cycle. The auxiliary control unit monitors the input signal, detects when high-amplitude oscillations occur, and opens the switch only during those specific periods. During normal operation periods, the switch remains closed allowing full signal transmission. This periodic activation ensures protection against harmful oscillations while minimizing information loss
Data Source
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AI summary
The invention relates to an integrated circuit for conditioning an oscillating analog signal comprising a succession of damped oscillations, the integrated circuit comprising an input/output (IO) cell having: - a first port (PAD) configured to receive said oscillating analog signal, called input signal, - a second port (ANA) configured to deliver an analog output signal from the input signal, - control means coupled between the first port and the second port and configured to suppress at least the first oscillation from the input signal so as to deliver in the output signal oscillations of the input signal having an amplitude less than a first threshold.