Dynamic Crossing Point Inverter for Duty Error and Baseline Wander

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Solution Overview

Problem

Existing inverter designs suffer from duty error and baseline wander issues due to fixed crossing points, which affect the reliability and efficiency of signal processing.

Innovation Solution

An inverter circuit with a dynamic crossing point, featuring a tunable pull-up and pull-down circuit, and a control circuit to adaptively adjust the crossing point, allowing for earlier transitions and improved signal processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a fixed crossing point inverter is used, then the circuit structure is simple, but duty error and baseline wander issues occur

Engineering Contradiction:

Improveinverter circuit structureVSAvoidsignal processing reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies the Dynamics principle by transforming the fixed crossing point into a dynamic, adjustable crossing point. The inverter circuit includes control circuitry that dynamically adjusts the crossing point voltage based on detected baseline wander and duty error conditions, allowing the circuit to adapt to varying signal conditions and maintain reliable operation without requiring excessive structural complexity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implementsParameter changes by modifying the crossing point voltage parameter in response to detected signal degradation. The control circuit monitors the inverter's operation and adjusts the crossing point voltage level to compensate for baseline wander and duty error, thereby maintaining signal integrity while keeping the overall circuit structure relatively simple.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a dynamic crossing point inverter is used, then signal processing reliability is improved, but device complexity increases

Engineering Contradiction:

Improvesignal processing reliabilityVSAvoidinverter circuit structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies the Feedback principle by incorporating a control circuit that monitors the inverter's output and baseline conditions, then feeds this information back to dynamically adjust the crossing point voltage. This closed-loop feedback mechanism improves signal processing reliability by continuously compensating for duty error and baseline wander while adding only moderate circuit complexity through the use of standard control circuitry.

Inventive Principle:

Principle #23Feedback

3Ease of manufacture

If the crossing point is fixed, then the inverter circuit is simple to implement, but transition times are prolonged

Engineering Contradiction:

Improveinverter circuit implementationVSAvoidsignal transition time

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The patent applies the Dynamics principle by enabling the crossing point to dynamically adjust during operation rather than remaining fixed. This allows the inverter to optimize its transition characteristics in real-time, reducing transition times by adapting the crossing point voltage to current signal conditions while maintaining ease of manufacture through the use of standard adjustable circuit components.

Inventive Principle:

Principle #15Dynamics

4Loss of time

If the crossing point is dynamic and adjustable, then transition times are reduced, but device complexity increases

Engineering Contradiction:

Improvesignal transition timeVSAvoidinverter circuit structure

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent implementsParameter changes by adjusting the crossing point voltage parameter dynamically to optimize transition times. The control circuit modifies this single critical parameter in response to detected signal conditions, achieving reduced transition times without requiring complete restructuring of the inverter circuit, thereby limiting the increase in device complexity to what is necessary for parameter adjustment only.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260012180A1Inverter circuit with dynamic crossing point and method of adaptively adjusting crossing point of inverter circuit

Publication Date: 2026.01.08 AIROHA TECHNOLOGY CORPORATION

AI summary

An inverter circuit includes a first metal-oxide-semiconductor (MOS) transistor, a second MOS transistor, a tunable pull-up circuit, a tunable pull-down circuit, and a control circuit. The first MOS transistor has a control terminal configured to receive a first input signal, a first connection terminal, and a second connection terminal. The second MOS transistor has a control terminal configured to receive the first input signal, a first connection terminal, and a second connection terminal coupled to the second control terminal of the first MOS transistor. The tunable pull-up circuit is coupled between the first connection terminal of the first MOS transistor and a first reference voltage. The tunable pull-down circuit is coupled between the first connection terminal of the second MOS transistor and a second reference voltage. The control circuit adaptively adjusts pull-up strength of the tunable pull-up circuit and pull-down strength of the tunable pull-down circuit.