PLL Reference Oscillator Arrangement for Fast Low-Noise Synchronization
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Solution Overview
Problem
Existing reference oscillators, particularly oven quartz oscillators, face challenges with high power dissipation, material usage, and lengthy heating phases, which hinder the rapid availability of stable high-frequency signals with low phase noise.
Innovation Solution
A reference oscillator arrangement comprising a first reference oscillator and a second reference oscillator, where the phase-locked loop controls the frequency and phase of the second oscillator to match that of the first, allowing for improved frequency stability and reduced phase noise without the need for heating, thus overcoming the limitations of oven quartz oscillators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oven quartz oscillators are used to achieve high frequency stability and low phase noise, then the output signal quality is improved, but power consumption increases and heating time is required
Solution Approach 1:
The system divides the oscillator function into two separate units: a first oscillator dedicated to frequency reference and stability, and a second oscillator dedicated to signal generation with low phase noise. This segmentation allows each oscillator to be optimized for its specific function without requiring high power consumption for temperature control of both units.
Solution Approach 2:
A phase-locked loop (PLL) is introduced as an intermediary device to couple the first and second oscillators. The PLL transfers the frequency stability characteristics from the first oscillator to the second oscillator's output signal, enabling the second oscillator to produce stable frequency references without requiring its own temperature control mechanism.
2Reliability
If oven quartz oscillators are used to achieve high frequency stability, then the output signal quality is improved, but the heating phase delays rapid availability
Solution Approach 1:
The first oscillator continuously maintains frequency stability through temperature compensation or control mechanisms, preparing the frequency reference in advance. When the second oscillator needs stable frequency output, the PLL immediately locks onto the pre-prepared stable reference from the first oscillator, eliminating the need for a separate heating phase.
Solution Approach 2:
By separating the temperature control function (first oscillator) from the signal generation function (second oscillator), the system eliminates the need to heat the entire oscillator assembly. The first oscillator can be small and efficiently heated, while the second oscillator remains at ambient temperature, significantly reducing overall heating time.
3Reliability
If oven quartz oscillators are used to achieve high frequency stability, then the output signal quality is improved, but material usage and device complexity increase
Solution Approach 1:
The temperature control mechanism and associated materials (oven structure, heating elements, insulation) are extracted from the signal-generating oscillator and placed solely in the reference oscillator. This extraction simplifies the main oscillator's construction while maintaining frequency stability through the PLL's frequency transfer mechanism.
Solution Approach 2:
The phase-locked loop acts as an intermediary that transfers frequency stability characteristics without requiring physical or thermal coupling between the oscillators. This allows the use of simpler, smaller oscillator components that would be insufficient for direct thermal stabilization, thereby reducing material usage and device complexity.
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
This solution enables the generation of high-quality output signals with rapid stability and low phase noise, reducing power consumption and material requirements, while maintaining frequency stability comparable to oven quartz oscillators.
Implementation Method 1
a phase-locked loop for controlling the frequency and/or phase of the second reference oscillator to the frequency and/or phase of the first reference oscillator
Data Source
AI summary
The present invention relates to a reference oscillator arrangement comprising a first reference oscillator for generating a first output signal and a second reference oscillator for generating a second output signal, wherein the reference oscillator arrangement comprises a phase locked loop for controlling the frequency and/or phase of the second reference oscillator to the frequency and/or phase of the first reference oscillator.