Self-Correcting Level Shifter Circuit for Floating Logic Levels

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Solution Overview

Problem

Existing level shifter circuitry struggles to accurately interface circuits operating at different voltage levels, especially under complex operating conditions with floating logic levels and large voltage swings, leading to inaccuracies and potential damage to downstream circuitry.

Innovation Solution

The implementation of self-correcting level shifter circuitry, which includes dynamic level shifter circuitry, latch circuitry, and correction circuitry. This configuration compares digital inputs and outputs, generates correction currents based on mismatches, and adjusts the logical state of the output signal to ensure accurate level shifting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional level shifter circuitry is used to interface circuits at different voltage levels, then voltage level conversion is achieved, but accuracy of logical states deteriorates under complex operating conditions with floating logic levels and large voltage swings

Engineering Contradiction:

Improveaccuracy of logical state conversionVSAvoidreliability under floating logic levels and large voltage swings

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent implements correction circuitry that continuously monitors the output logical state and compares it against expected values. When a mismatch is detected (indicating an adverse state), the correction circuitry generates correction currents to adjust the output back to the correct logical state. This feedback mechanism maintains accuracy despite voltage swings and floating logic levels that would cause conventional level shifters to fail.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The level shifter circuit is self-correcting, meaning it automatically detects and corrects its own errors without external intervention. The correction circuitry uses the output signal itself to generate correction currents when adverse states are detected, enabling the system to maintain reliability autonomously under complex operating conditions.

Inventive Principle:

Principle #25Self-service

2Power

If conventional level shifter circuitry is used, then voltage level conversion is achieved, but downstream circuitry may be damaged due to inaccuracies and large voltage swings

Engineering Contradiction:

Improvevoltage level conversion capabilityVSAvoiddamage risk to downstream circuitry

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The correction circuitry proactively detects adverse states before they can cause damage to downstream circuitry. By continuously monitoring logical states and generating correction currents in advance, the system prevents voltage swings and inaccuracies from propagating to downstream components, thereby cushioning them against potential harm.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The feedback mechanism ensures that any deviation from correct logical states is immediately corrected, preventing harmful voltage levels from reaching downstream circuitry. The correction currents are generated based on real-time comparison of output states, ensuring downstream protection.

Inventive Principle:

Principle #23Feedback

3Reliability

If self-correcting level shifter circuitry is implemented, then accuracy and reliability are improved, but device complexity increases due to additional correction circuitry

Engineering Contradiction:

Improveaccuracy under complex operating conditionsVSAvoidcomplexity of correction circuitry

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The correction circuitry is designed to handle multiple types of errors and operating conditions using a unified approach. The same correction transistors and current sources that correct logical state inaccuracies also protect against voltage swings and floating logic levels, making the circuit versatile without requiring separate correction mechanisms for each error type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The correction circuitry operates by dynamically changing current parameters to correct logical states. By adjusting the magnitude and direction of correction currents based on detected errors, the system maintains simplicity in its correction mechanism while handling complex operating conditions through parameter variation rather than structural complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250055460A1Methods and apparatus to dynamically correct level shifter circuitry

Publication Date: 2025.02.13 TEXAS INSTRUMENTS INC

AI summary

An example apparatus includes: level shifter circuitry having a first input terminal, a second input terminal, and an output terminal; latch circuitry having an input terminal and an output terminal, the input terminal of the latch circuitry coupled to the output terminal of the level shifter circuitry; a first transistor having a first terminal and a control terminal, the first terminal of the first transistor coupled to the first input terminal of the level shifter circuitry; a second transistor having a first terminal, a second terminal, and a control terminal, the first terminal of the second transistor coupled to the control terminal of the first transistor, the control terminal of the second transistor coupled to the first input terminal of the level shifter circuitry; and a third transistor having a terminal coupled to the second terminal of the second transistor.