Level Shifter Feedback Circuit for Radiation-Induced False Switching
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Solution Overview
Problem
Level shifter circuits face challenges in reducing current consumption while maintaining speed and facilitating constant feedback, particularly in radiation-hardened environments where 'false' switching events can occur due to ionized particles, leading to undesired output signal changes.
Innovation Solution
A circuit design incorporating a feedback network with transistors and a current sensor to detect and cancel out uncontrolled switching events, combined with a latch circuit block and logic gates to manage switching signals, allowing for reduced pulse duration and immediate recovery of output signal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the level shifter is made fast by increasing switching speed, then speed is improved, but current consumption increases during transitions
Solution Approach 1:
The patent employs pulsed switching signals to control the first switching element, enabling the level shifter to operate in periodic bursts rather than continuous operation. This allows the circuit to achieve fast switching when needed while consuming minimal current during idle periods, directly resolving the contradiction between speed and current consumption.
Solution Approach 2:
The patent implements a feedback network that continuously monitors the output signal and adjusts the switching element control accordingly. This feedback mechanism ensures fast response to signal changes while optimizing current consumption by preventing unnecessary switching operations, thereby resolving the speed-current consumption trade-off.
2Use of energy by moving object
If latch operation is used to reduce current consumption, then current consumption is reduced, but false switching events occur due to radiation effects
Solution Approach 1:
The feedback network continuously monitors the output signal and compares it with expected behavior, enabling detection of false switching events caused by radiation. When false switching is detected, the feedback mechanism triggers corrective action to restore proper operation, thus maintaining reliability while preserving the low current consumption benefits of latch operation.
Solution Approach 2:
The patent implements preliminary protective measures through the feedback network that anticipates and counteracts false switching events before they propagate. By continuously monitoring and preparing correction mechanisms, the system prevents radiation-induced false switching from affecting output reliability while maintaining energy-efficient latch operation.
3Reliability
If feedback network is added to detect and cancel false switching, then reliability is improved, but device complexity increases
Solution Approach 1:
The feedback network is designed to perform multiple functions: monitoring output signals, detecting false switching events, triggering correction mechanisms, and optimizing normal operation. By consolidating these functions into a single integrated network, the patent achieves high reliability without proportionally increasing device complexity.
Solution Approach 2:
The feedback network is configured to automatically detect and correct false switching events without external intervention. The system self-monitors and self-corrects, eliminating the need for additional complex control logic or external monitoring circuits, thus improving reliability while minimizing the increase in device complexity.
Data Source
AI summary
A level-shifter circuit operates to shift an input signal referenced to a first set supply voltages to generate an output signal referenced to a second set of supply voltages. The output signal from the level-shifter circuit is latched by a latching circuit. A logic gate has a first input configured to receive the input signal, a second input configured to receive a feedback signal and an output coupled to a input of the level shifting circuit. A feedback circuit has a first input configured to receive the output signal, a second input configured to receive the input signal and an output configured to generate the feedback signal. The feedback circuit operates to sense an uncontrolled switching event of the output signal occurring in the absence of a switching of the input signal and apply, in response thereto, the feedback signal to cancel the uncontrolled switching event.