Multicore LC Oscillator with Programmable Amplifiers
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Solution Overview
Problem
Existing LC oscillators have limited oscillation frequency tuning ranges and low phase noise, making it difficult to achieve extended frequency tuning ranges without significant area overhead or compromising phase noise performance.
Innovation Solution
A multicore LC oscillator design with magnetically and electrically coupled inductors and programmable amplifier pairs that allow operation in multiple modes, enabling extended frequency tuning ranges while maintaining improved phase noise performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional single-core LC oscillator is used, then phase noise performance is maintained, but oscillation frequency tuning range is limited
Solution Approach 1:
The oscillator is divided into multiple independent oscillator cores (first, second, third, and fourth cores), each capable of operating independently or in combination. This segmentation allows the system to achieve extended frequency tuning ranges by selectively activating different core combinations while maintaining the phase noise benefits of individual LC oscillators.
Solution Approach 2:
Each oscillator core is designed with universal functionality to operate in multiple modes. The cores can function individually or in various combinations (e.g., first and second cores together, third and fourth cores together), enabling the same hardware structure to provide both narrowband low-phase-noise operation and wideband frequency coverage.
2Adaptability or versatility
If multiple LC oscillator cores are combined, then frequency tuning range is extended, but implementation area overhead increases
Solution Approach 1:
Multiple oscillator cores are merged into a single integrated circuit structure with shared components and interconnections. The cores share common biasing circuits, control logic, and output stages, which reduces the total area compared to implementing separate oscillator circuits. The magnetic coupling between inductors of different cores also enables area-efficient layout.
Solution Approach 2:
The oscillator cores are arranged in a multi-dimensional layout on the chip, utilizing vertical stacking and three-dimensional integration techniques. This allows multiple cores to occupy overlapping or adjacent areas in different layers, effectively reducing the projected area overhead while maintaining all necessary functionality.
3Adaptability or versatility
If amplifier pairs are used to force oscillation phases, then mode control is achieved, but device complexity increases
Solution Approach 1:
The amplifier pairs are designed with dynamic control capabilities, allowing their gain and phase characteristics to be adjusted in real-time based on the desired operating mode. This dynamic adjustment enables the same amplifier pair to support multiple oscillation modes (e.g., forcing same phase or opposite phase between cores) without requiring separate static amplifier circuits for each mode.
Solution Approach 2:
The amplifier pairs incorporate feedback mechanisms that automatically adjust their operation based on the oscillation state of the connected cores. This feedback control simplifies the overall system by eliminating the need for complex external control circuits, as the amplifier pairs self-regulate to maintain the desired phase relationships across different operating modes.
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 multicore LC oscillator significantly extends the oscillation frequency tuning range with minimal implementation area overhead and improved phase noise, surpassing the limitations of traditional single-core or multicore oscillators.
Implementation Method 1
an inductor of the LC resonance tank of the first oscillator is magnetically coupled and electrically connected with an inductor of the LC resonance tank of the second oscillator
Data Source
AI summary
A multimode, multicore inductor-capacitor (LC) oscillator having an increased oscillation frequency tuning range, and related method, are provided. The oscillation frequency tuning range of existing oscillators is limited. LC oscillators are known to have very low phase noise but a narrow frequency tuning range. The present oscillator has at least two LC oscillator cores and is capable of operating in multiple different modes of oscillation thereby increasing its overall oscillation frequency tuning range. A set of programmable amplifier pairs is used to force particular relative oscillation phases at the nodes of the multiple cores of the oscillator to realize one or more additional modes of oscillation for the oscillator. The additional oscillation mode increases the frequency tuning range of the oscillator.