Asynchronous Circuit Calibration Using Monotonic Time Gating
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Solution Overview
Problem
Existing calibration methods for circuits require external clocks and multiple pin connections, making them complex and inefficient for adjusting time constants and resistances, especially for on-chip variations.
Innovation Solution
A calibration system that operates asynchronously using a function generator to create a monotonic time response, allowing for independent adjustment of time constants and resistances through a single pin connection by generating an error signal based on frequency differences between a reference and calibration circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external clock and multiple pin connections are used for calibration, then calibration accuracy is improved, but device complexity and pin requirements increase
Solution Approach 1:
The patent extracts the clock function from external components and integrates it into the calibration circuit itself. The calibration circuit generates its own timing signals internally, eliminating the need for external clock inputs while maintaining calibration accuracy. This reduces device complexity and pin requirements without sacrificing measurement precision.
Solution Approach 2:
The calibration circuit is designed to perform multiple functions using a single integrated structure. It simultaneously generates timing signals, performs frequency comparison, and produces calibration outputs all within one circuit block. This multi-functionality eliminates the need for separate external clock circuits and multiple pin connections, reducing overall system complexity while maintaining calibration accuracy.
2Measurement precision
If external clock is used for calibration, then timing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The calibration circuit is designed to be self-sufficient by generating its own timing signals internally. The circuit does not require external clock inputs or complex external timing arrangements. This self-service capability maintains timing precision while dramatically improving ease of operation, as the circuit can be calibrated simply by applying a reference signal without complex external timing setup.
3Adaptability or versatility
If multiple pin connections are used for calibration, then calibration capability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent combines multiple calibration functions and signal paths into a single integrated calibration circuit. The circuit integrates timing signal generation, frequency comparison, and calibration output functions into one unified structure that requires minimal external connections. This merging maintains comprehensive calibration capability while dramatically simplifying manufacturing by reducing the number of pin connections and external components required.
Data Source
AI summary
A system and method of calibration develops a function from which is generated a monotonic time response; a gating period is defined from the monotonic time response and any error in the frequency of a reference signal is determined during the gating period; from that error an error signal is generated for adjusting the time constant of a circuit to be calibrated.