Auto-Calibrated Pulse Width Circuit for PVT Compensation

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Solution Overview

Problem

Conventional pulse width generators require extensive time and effort to set up accurately due to dependencies on pressure, voltage, and temperature, leading to inaccuracies in generating precise pulse signals.

Innovation Solution

A pulse width generator system incorporating a converter, period calculator, auto-calibration unit, and multiplexer to generate a tunable pulse width output signal, which adjusts for variations in pressure, voltage, and temperature using a feedback loop and linear extrapolation equations to ensure precise pulse width generation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional pulse width generator is used without auto-calibration, then device complexity is reduced, but measurement precision and reliability deteriorate due to dependencies on pressure, voltage and temperature

Engineering Contradiction:

Improvepulse signal accuracyVSAvoidsetup time

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system performs preliminary calibration by measuring the actual period of a reference clock signal and storing calibration data before normal operation. This preliminary action captures environmental dependencies (pressure, voltage, temperature) so that subsequent pulse width generation can compensate for these variations without requiring real-time manual adjustment, thereby improving accuracy while maintaining operational simplicity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements a feedback mechanism where the actual period of the reference clock signal is measured and used to adjust the pulse width generation parameters. The period calculator continuously monitors the clock signal period, and this feedback information is used to dynamically compensate for environmental variations, ensuring accurate pulse width generation despite changes in pressure, voltage, or temperature conditions.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If manual setup and calibration is performed for accuracy, then measurement precision improves, but productivity and ease of operation worsen due to extensive time and effort required

Engineering Contradiction:

Improvepulse signal accuracyVSAvoidsetup time

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The system performs self-calibration by automatically measuring the reference clock signal period and using this information to adjust its own operation. The auto-calibration unit and period calculator work autonomously to compensate for environmental variations without requiring user intervention or manual adjustment, thereby maintaining high measurement precision while eliminating the time-consuming manual setup process.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system performs preliminary calibration measurements during initialization or at predetermined intervals, storing the measured period values for later use. This preliminary action captures environmental characteristics in advance, allowing the system to operate accurately without requiring repeated manual calibration, thus improving productivity while maintaining precision.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If conventional pulse width generator is used without environmental compensation, then device complexity is reduced, but reliability deteriorates due to sensitivity to pressure, voltage and temperature variations

Engineering Contradiction:

Improvepulse width accuracy under varying conditionsVSAvoidsystem structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system employs feedback from the period calculator to continuously monitor and compensate for environmental variations. By measuring the actual clock signal period and using this feedback to adjust pulse width parameters, the system maintains reliable operation across varying pressure, voltage, and temperature conditions without requiring complex hardware modifications.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system changes operational parameters dynamically based on measured environmental conditions. By adjusting the pulse width generation parameters according to the measured clock period variations, the system compensates for environmental effects and maintains reliability without adding significant structural complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11791814B2Circuit and method to enhance efficiency of semiconductor device

Publication Date: 2023.10.17 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

A circuit includes a period calculator and a pulse width calculator. The period calculator is configured for receiving a first predetermined digital code and a second predetermined digital code, and for calculating a first calculated period value according to the first predetermined digital code, and calculating a second calculated period value according to the second predetermined digital code. The first predetermined digital code has a first predetermined period value, and the second predetermined digital code has a second predetermined period value. The pulse width calculator is configured for receiving a predetermined pulse width, and calculating a first pulse width code corresponding to the predetermined pulse width according to the first predetermined period value, the second predetermined period value, the first calculated period value, the second calculated period value and the predetermined pulse width.