Coupled Synchronous Oscillator Layout for Low Phase Noise
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Solution Overview
Problem
Current integrated on-silicon technologies fail to meet the low phase noise requirements for ultra-high-speed data transfer technologies, particularly in millimeter wavelengths, as they are limited by parasitic capacitance and frequency range, and III-V semiconductor technologies are costly and less functional.
Innovation Solution
The integration of multiple identical, synchronous, and independent oscillator circuits coupled in parallel via short coupling tracks that minimize parasitic capacitance and phase shift, allowing for reduced phase noise without increasing power or modifying the oscillator structure, and are produced on a silicon substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power is increased to decrease phase noise, then phase noise decreases, but transistor size increases leading to more parasitic capacitance and smaller frequency ranges
Solution Approach 1:
The patent combines multiple independent oscillator circuits (at least two oscillators) into a coupled oscillator system. By merging the oscillators through coupling tracks, the system achieves lower phase noise through power combination while maintaining the frequency range through synchronized operation of multiple oscillators, thus resolving the contradiction between phase noise reduction and frequency range preservation.
2Adaptability or versatility
If inductance is decreased to increase frequency range, then frequency range increases, but quality factor decreases leading to increased phase noise
Solution Approach 1:
The patent merges multiple oscillator circuits with reduced inductance (enabling wider frequency range) into a coupled system. The combination of multiple oscillators compensates for the quality factor reduction in individual oscillators, achieving both wide frequency range and low phase noise simultaneously through the synergistic effect of multiple oscillating elements working in unison.
3Measurement precision
If III-V semiconductor technology is used to achieve low phase noise, then phase noise performance improves, but production cost increases and functionality is reduced
Solution Approach 1:
The patent creates a copy-based solution by using multiple replicated oscillator circuits on a silicon substrate. Instead of relying on expensive III-V semiconductor material properties, the system achieves low phase noise by copying and coupling multiple standard silicon oscillators, thereby maintaining compatibility with existing silicon manufacturing processes while achieving the desired phase noise performance.
4Measurement precision
If multiple oscillators are coupled to combine power and decrease phase noise, then phase noise decreases, but frequency correspondence and synchronization become sensitive
Solution Approach 1:
The patent applies equipotentiality by coupling the oscillators at homologous nodes, creating symmetric coupling paths that ensure equal electrical conditions for all oscillators. This symmetric coupling configuration promotes natural frequency alignment and reduces sensitivity to synchronization issues, as all oscillators experience identical coupling conditions and operate at equivalent electrical potentials.
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 approach effectively decreases phase noise while maintaining the operating frequency range and reducing production costs, enabling compatibility with existing on-silicon production methods and supporting the performance of integrated circuits in telecommunications and radar systems.
Implementation Method 1
coupled one to one in parallel at homologous oscillating nodes of the respective oscillating circuits, via at least one coupling track
Implementation Method 2
Inductor-capacitor (LC) oscillators are of sinusoidal type and usually include an oscillating circuit comprising a coil and a capacitor. The oscillating circuit sets the oscillation frequency and stores the energy of the oscillations.
Data Source
AI summary
An integrated circuit includes at least two identical, synchronous and independent oscillator circuits that are coupled one to one in parallel with each other at homologous oscillating nodes of the respective oscillator circuits. The coupling in parallel is made using at least one coupling track that is configured so as to not introduce any phase shift or to introduce a very small phase shift.