Inductively Coupled BAW Oscillators for Low-Jitter Multi-Phase Clocks
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Solution Overview
Problem
Existing oscillator circuits using bulk acoustic wave (BAW) resonators face challenges in achieving low root mean squared (RMS) jitter, low current consumption, and high power-jitter figure of merit (FOM) for multi-phase clock signals.
Innovation Solution
The proposed solution involves a multi-phase oscillator circuit that combines multiple inductively coupled BAW oscillators and coupling stages to generate multi-phase oscillator signals. This configuration includes a first and second BAW oscillator, each with multiple outputs, and corresponding coupling stages that amplify and phase-shift the signals. The circuit also incorporates combiner circuitry to produce higher output clock frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multi-phase inductor-capacitor oscillators are used, then oscillator circuits can be implemented, but they exhibit high RMS jitter, high current consumption, and low power-jitter FOM
Solution Approach 1:
The oscillator circuit is divided into multiple independent BAW oscillator units (first BAW oscillator, second BAW oscillator, etc.), each generating a phase signal. These segmented oscillators are then combined through coupling stages to produce multi-phase outputs. This segmentation allows each oscillator to operate independently with optimized performance, achieving low jitter and low power consumption that cannot be achieved with a single traditional oscillator.
Solution Approach 2:
The patent replaces the traditional inductor-capacitor (LC) resonator system with bulk acoustic wave (BAW) resonators. This substitution leverages acoustic resonance instead of electrical resonance, providing higher quality factors and lower phase noise. The BAW resonators are coupled through magnetic coupling stages rather than traditional electrical coupling, further reducing power consumption and improving jitter performance.
2Reliability
If multiple BAW oscillators and coupling stages are combined to generate multi-phase signals, then low RMS jitter and low current consumption are achieved, but device complexity increases
Solution Approach 1:
Multiple BAW oscillators are merged through magnetic coupling stages to produce multi-phase output signals. The coupling stages combine the output of one oscillator with the input of the next, creating a unified multi-phase signal generation system. This merging approach achieves the desired multi-phase functionality while maintaining the simplicity and low power consumption of individual BAW oscillator units.
Solution Approach 2:
The BAW oscillator circuit is designed with universal coupling stages that can generate multiple phase outputs (e.g., 0°, 90°, 180°, 270°) from the same oscillator core. The coupling stages are configured to provide different phase shifts, allowing a single oscillator unit to serve multiple functions and generate various clock phases needed for different applications, reducing the need for separate dedicated oscillators for each phase.
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 described multi-phase oscillator circuit achieves low RMS jitter (as low as 21 fs per phase), low current consumption (as low as 10.7 mA), and a high power-jitter FOM (−262 dB), outperforming traditional multi-phase inductor-capacitor oscillators.
Implementation Method 1
The oscillator produces a signal at the resonant frequency of the resonator. A crystal oscillator, for example, is an electronic circuit that uses the mechanical resonance of a vibrating crystal to create an electrical signal with a very precise frequency.
Implementation Method 2
The proposed solution involves a multi-phase oscillator circuit that combines multiple inductively coupled BAW oscillators and coupling stages to generate multi-phase oscillator signals.
Data Source
AI summary
An oscillator circuit includes a first BAW oscillator, a first coupling stage, a second BAW oscillator, and a second coupling stage. The first BAW oscillator is configured to generate a first output signal at a frequency. The first coupling stage is coupled to the first BAW oscillator, and is configured to amplify the first output signal. The second BAW oscillator is coupled to the first coupling stage, and is configured to generate a second output signal at the frequency. The second output signal differs in phase from the first output signal. The second coupling stage is coupled to the first BAW oscillator and the second BAW oscillator, and is configured to amplify the second output signal and drive the first BAW oscillator.