Clock Oscillator Aging Compensation During Reference-Loss Holdover
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Solution Overview
Problem
Oscillator circuits in synchronization network applications face frequency instability due to aging effects during holdover states when external reference clock signals are lost, leading to reduced holdover time and potential failure to meet synchronization requirements.
Innovation Solution
A frequency generating device comprising an oscillator circuit and a processor circuit that calculates and applies a control voltage regulation rate to compensate for frequency aging, adjusting the clock frequency to maintain stability and meet synchronization network requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency aging compensation is not applied, then the device structure remains simple, but the holdover time is reduced and frequency stability deteriorates
Solution Approach 1:
The patent pre-calculates and stores frequency aging rate values and control voltage slope values in the oscillator circuit before operation. During holdover state, the processor circuit retrieves these pre-stored values and performs compensation calculations, avoiding the need for complex real-time aging characterization and reducing operational complexity while maintaining frequency stability
Solution Approach 2:
The patent introduces a processor circuit as an intermediary component that mediates between the oscillator circuit and the frequency compensation function. The processor circuit reads pre-stored aging parameters, calculates control voltage adjustments, and applies compensation, thereby separating the complex compensation algorithm from the oscillator hardware and maintaining relative structural simplicity
2Adaptability or versatility
If external reference clock signals are lost, then the oscillator operates independently, but frequency stability deteriorates due to aging effects
Solution Approach 1:
The patent implements a feedback mechanism where the processor circuit continuously monitors the oscillator's frequency aging rate and control voltage slope from pre-stored data, calculates the required control voltage adjustment, and applies compensation to maintain frequency stability during independent holdover operation without external reference signals
Solution Approach 2:
The oscillator circuit pre-stores frequency aging rate values and control voltage slope values that characterize its aging behavior. When operating independently without external references, the system retrieves these pre-characterized parameters and applies compensation based on elapsed time, enabling reliable independent operation while compensating for aging effects
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 extends holdover time by compensating for frequency aging, ensuring continued frequency stability and meeting synchronization network requirements even in the absence of external reference clock signals.
Implementation Method 1
The processor circuit reads a frequency aging rate value and a control voltage slope of the oscillator circuit, calculates a control voltage regulation rate value corresponding to the frequency aging rate value and the control voltage slope, and compensate the control voltage based on the control voltage regulation rate value
Data Source
AI summary
A frequency generating device and an operation method thereof are provided. The frequency generating device includes an oscillator circuit and a processor circuit. The oscillator circuit is configured to generate a clock signal and adjust a clock frequency of the clock signal according to a control voltage. The processor circuit is coupled to the oscillator circuit and is configured to generate the control voltage. The processor circuit reads a frequency aging rate value and a control voltage slope of the oscillator circuit from the oscillator circuit, calculates a control voltage regulation rate value corresponding to the frequency aging rate value and the control voltage slope, and compensates the control voltage based on the control voltage regulation rate value. Alternatively, the processor circuit reads the control voltage regulation rate value from the oscillator circuit, and compensates the control voltage based on the control voltage regulation rate value.