Temperature-Tuned Timing Circuit for Accurate Delay Across Heat
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Solution Overview
Problem
Timing circuits in electronic devices exhibit temperature-dependent characteristics that need to be properly coordinated to maintain critical timing signals within tolerance ranges, but conventional methods struggle with calibrating temperature dependencies during manufacturing.
Innovation Solution
A timing circuit with a delay stage and a gate stage, featuring adjustable RC delay and logic threshold, allows for tuning temperature coefficients during manufacturing through fuse trimming, ensuring accurate time delays across temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional timing circuits are used with fixed temperature characteristics, then the circuit design is simple, but the timing accuracy deteriorates under temperature variations
Solution Approach 1:
The patent applies dynamics by making the timing circuit's temperature characteristics adjustable rather than fixed. The delay stage includes adjustable RC components and the gate stage has an adjustable logic threshold, allowing the circuit to be tuned for different temperature coefficients. This transforms a static circuit into a dynamically adjustable one that can adapt to temperature variations.
Solution Approach 2:
The patent changes physical parameters of the circuit components to achieve temperature compensation. Specifically, it adjusts the RC time constant values and the gate logic threshold voltage to tune the temperature coefficient of the delay. By modifying these parameters during manufacturing, the circuit achieves accurate timing across temperature ranges without requiring complex active compensation mechanisms.
2Manufacturing precision
If temperature compensation mechanisms are added to maintain timing accuracy, then timing precision improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing temperature compensation tuning during the manufacturing process rather than requiring post-manufacturing calibration. The delay stage and gate stage are pre-adjusted to have matched temperature coefficients, and this compensation is built into the circuit design itself. This eliminates the need for complex external compensation circuits or field calibration procedures.
Solution Approach 2:
The timing circuit serves itself by having the delay stage and gate stage work together with matched temperature coefficients. The gate stage's logic threshold is adjusted to compensate for temperature-dependent variations in the delay stage, creating a self-compensating system. This internal self-service mechanism eliminates the need for external compensation circuits or continuous calibration.
3Adaptability or versatility
If adjustable RC delay and logic threshold are implemented, then temperature coefficient tuning capability improves, but circuit design complexity worsens
Solution Approach 1:
The patent applies local quality by making specific parts of the circuit adjustable rather than the entire circuit. The delay stage has adjustable RC components and the gate stage has an adjustable logic threshold, but these are localized adjustments. This allows temperature coefficient tuning capability while keeping the overall circuit structure relatively simple and avoiding complete redesign of the entire timing circuit.
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 enables precise temperature-dependent timing without post-manufacturing calibration, optimizing timing parameters and reducing operational complexity in devices like DRAM and FeRAM.
Implementation Method 1
A delay stage is configured to produce a delayed signal by introducing a delay to the input signal. The gate stage is configured to receive the delayed signal and a logic threshold, to produce the output signal using the delayed signal and the logic threshold.
Implementation Method 2
A delay stage is configured to produce a delayed signal by introducing a delay to the input signal
Data Source
AI summary
A system (100) for providing a timing signal with tunable temperature dependency in an electronic device may include a timing circuit (102) and an initial setting circuit (104). The timing circuit (102) may include a delay stage (106) and a gate stage (108). The delay stage (106) may be configured to receive an input signal and to produce a delayed signal by introducing a delay to the input signal. The gate stage (108) may be configured to receive the delayed signal and a threshold setting signal, to produce an output signal using the delayed signal and a logic threshold, and to set an initial value of the logic threshold according to the threshold setting signal. The initial setting circuit (104) may be configured to allow the threshold setting signal to be tuned for providing the time delay with a specified temperature dependency.