Temperature-Invariant DCO Circuit for Stable Clock Frequency
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Solution Overview
Problem
Digitally controlled oscillators are sensitive to ambient temperature variations, causing oscillation frequency to differ by more than 1% over 100°C, which affects the stability of the reference clock.
Innovation Solution
A temperature invariant digitally controlled oscillator is configured with a temperature sensor, decision logic circuit, and conditioner to adjust silicon temperature, using digitally controlled signals and power down signals to enable or disable temperature adjusting elements, maintaining temperature around a predetermined value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digitally controlled oscillator is used to provide stable reference clock over voltage variations, then voltage stability is improved, but temperature sensitivity causes oscillation frequency to differ by more than 1% over 100°C variations
Solution Approach 1:
A temperature sensor is introduced as an intermediary component to detect the temperature of the digitally controlled oscillator. The sensor provides temperature information to a temperature decision logic circuit, which then controls temperature adjusting elements to compensate for temperature variations, thereby maintaining stable oscillation frequency despite ambient temperature changes.
Solution Approach 2:
The patent implements a feedback mechanism where the temperature sensor continuously monitors the temperature of the digitally controlled oscillator and feeds this information back to the temperature decision logic circuit. Based on the feedback, the circuit adjusts the temperature adjusting elements to maintain the oscillator temperature within a predetermined range, ensuring frequency stability.
2Stability of the object's composition
If temperature adjusting elements are added to stabilize silicon temperature, then temperature stability is improved, but device complexity increases
Solution Approach 1:
The temperature control function is segmented into distinct modular components: a temperature sensor for detection, a temperature decision logic circuit for processing, and temperature adjusting elements for actuation. This segmentation allows each component to perform its specific function independently, making the overall system more manageable and easier to integrate into the digitally controlled oscillator.
Solution Approach 2:
The digitally controlled oscillator incorporates its own temperature monitoring and control system, making it self-regulating. The temperature sensor detects the oscillator's temperature, and the decision logic circuit automatically adjusts the temperature adjusting elements to maintain the temperature within the predetermined range without external intervention.
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 stabilizes the oscillation frequency by maintaining silicon temperature within a predetermined range, reducing sensitivity to temperature variations and ensuring a stable output clock frequency.
Implementation Method 1
a temperature sensor, a temperature decision logic circuit, and a temperature conditioner
Implementation Method 2
a number of the temperature adjusting elements in the temperature conditioner are enabled to deliver more power
Data Source
AI summary
A temperature invariant digitally controlled oscillator is disclosed. The digitally controlled oscillator is configured to generate an output clock with stable frequency. The temperature invariant digitally controlled oscillator comprises a digitally controlled oscillator, a temperature sensor, a temperature decision logic circuit, and a temperature conditioner. The digitally controlled signal is provided to adjust the oscillation frequency of the digitally controlled oscillator by changing its capacitances. The stabilization of the silicon temperature is achieved with the temperature sensor, the temperature decision logic circuit, and the temperature conditioner.