Temperature-Compensated Delay Circuit for Stable Transmission Timing
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Solution Overview
Problem
Existing circuit designs face performance degradation due to changes in ambient temperature, which affect the transmission delay on transmission wires, particularly in integrated circuits like clock trees, as the delay is not temperature-compensated.
Innovation Solution
A delay device comprising a first current source with a constant temperature coefficient, a second current source with a negative temperature coefficient, and a resistor generating a control voltage, which is used by a delay adjustment circuit to maintain signal transmission delay independently of ambient temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the transmission delay is adjusted using conventional methods, then the delay can be controlled under stable temperature conditions, but the transmission delay changes when ambient temperature changes, causing performance degradation
Solution Approach 1:
The patent changes the temperature parameter by introducing a negative temperature coefficient current that compensates for temperature-induced delay variations. The control voltage is adjusted based on temperature changes to maintain constant transmission delay, directly applying parameter change to resolve the contradiction between precision and reliability.
Solution Approach 2:
The patent implements feedback by using the control voltage to continuously adjust the transmission delay based on temperature conditions. The delay adjustment circuit receives feedback about temperature effects and modifies the delay accordingly, ensuring the transmission delay remains accurate under varying temperature conditions.
2Reliability
If the transmission delay is fixed to maintain correctness under temperature changes, then reliability is improved, but the ability to adjust delay for different design requirements is reduced
Solution Approach 1:
The patent makes the delay adjustment dynamic by allowing the control voltage to vary with temperature while maintaining the ability to set different delay values. The system dynamically compensates for temperature effects while preserving design flexibility, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The patent applies preliminary action by pre-characterizing the temperature dependence of the transmission wire and designing the negative temperature coefficient current to counteract these effects in advance. This allows the system to maintain correctness under temperature variation while preserving adjustment capability.
3Reliability
If temperature compensation is added to maintain delay correctness, then reliability under temperature variation is improved, but the device complexity increases
Solution Approach 1:
The patent introduces an intermediary element - the negative temperature coefficient current source - that mediates between the temperature environment and the transmission delay. This intermediary compensates for temperature effects without requiring complex restructuring of the entire delay circuit, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent creates a composite current system by combining a main current source with a negative temperature coefficient current source. This composite approach allows temperature compensation to be integrated into the existing delay circuit with minimal additional complexity while improving reliability.
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 effectively isolates signal transmission delay from ambient temperature fluctuations, ensuring consistent performance by adjusting the control voltage based on temperature changes, thus maintaining the correctness of the delay.
Implementation Method 1
a first current source configured to provide a first current with a constant temperature coefficient
Implementation Method 2
a second current source connected to the first current source in parallel and configured to provide a second current with a negative temperature coefficient
Implementation Method 3
The first resistor generates a control voltage at the first terminal of the first resistor according to the first current and the second current
Data Source
AI summary
A delay device and a control method of transmission delay capable of performing temperature compensation are provided. The delay device includes a first current source, a second current source, a first resistor, and a delay adjustment circuit. The first current source is configured to provide a first current with a constant temperature coefficient. The second current source is connected to the first current source in parallel and is configured to provide a second current with a negative temperature coefficient. A first terminal of the first resistor is coupled to the first current source and the second current source. A second terminal of the first resistor is coupled to a reference ground terminal. The first resistor generates a control voltage at the first terminal of the first resistor according to the first current and the second current. The delay adjustment circuit is coupled to a transmission wire. The delay adjustment circuit determines a signal transmission delay of the transmission wire according to the control voltage.