Capacitive Feedback Level Shifter for Noise-Immune Output Recovery
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Solution Overview
Problem
Conventional level shifter circuits face issues such as slow transition due to parasitic capacitances, high static consumption, low immunity to noisy environments, and potential data loss, especially in applications involving high-voltage and high-current systems like ultrasound pulsers.
Innovation Solution
A high-voltage level shifter circuit with capacitive feedback and a logic control system that checks the translated output data for consistency with the control input signal, using electronic switches like MOSFETs and a feedback path with a capacitor to ensure fast and accurate signal translation between low and high voltage domains, reducing static consumption and immunity to noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional level shifter circuits are used, then signal translation between voltage domains is achieved, but transition speed is slow due to parasitic capacitances
Solution Approach 1:
The patent implements a feedback mechanism where the output signal is fed back to the input stage through a feedback network. This feedback accelerates the transition speed by providing regenerative action that overcomes the slowing effect of parasitic capacitances, enabling faster voltage level translation while maintaining signal integrity.
2Use of energy by moving object
If conventional level shifter circuits are used, then voltage level translation is achieved, but static consumption is high
Solution Approach 1:
The patent employs periodic switching action rather than continuous conduction. The switching elements operate in pulsed manner, being conductive only during necessary transition periods and non-conductive during steady states. This periodic operation dramatically reduces static power consumption while maintaining reliable signal translation through controlled switching cycles.
3Power
If high voltage domain is used, then high current driving capability is achieved, but immunity to noisy environments is low
Solution Approach 1:
The feedback mechanism monitors the output signal quality and adjusts the input signal accordingly. This closed-loop control provides immunity to noisy environments by detecting and correcting noise-induced errors, while the high voltage domain maintains its current driving capability for powering high-current loads.
4Reliability
If conventional level shifter circuits are used, then signal translation is achieved, but data loss may occur leading to destructive events
Solution Approach 1:
The feedback network continuously verifies signal integrity during translation. When data loss or corruption is detected, the feedback mechanism triggers corrective action by retransmitting or correcting the affected data, preventing destructive events while maintaining overall system reliability without requiring fundamentally different circuit architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides high immunity to noisy power supplies and environments, prevents data loss, enables fast transitions, and reduces static consumption, ensuring reliable operation in noisy conditions.
Implementation Method 1
a feedback path (10) transferring an output signal (Q_N) from said output stage to said input stage, said feedback path including a capacitor (10)
Data Source
AI summary
A level shifter circuit includes: an input stage for receiving an input signal switchable between a first and a second input level and an output stage to produce a drive signal for the load that is switchable between a first and a second output level. A level translator translates the input signal switching between the input levels into the output stage switching between the output levels. A feedback element coupled to the output stage transfers to the input stage a feedback signal representative of the output level of the output stage. The input stage includes control circuitry sensitive to the input signal and the feedback signal for detecting undesired switching of the output stage between the first and second output levels occurring in the absence of input signal switching between the first and second input levels. The control circuitry inverts the output level of the output stage resulting from undesired switching.