Inductively Coupled BAW Multi-Phase Oscillators With Phase Calibration
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Solution Overview
Problem
Existing multi-phase oscillators face challenges in achieving low root mean squared (RMS) jitter, low current consumption, and high power-jitter figure of merit (FOM) due to frequency mismatch and phase errors in bulk acoustic wave (BAW) oscillators and coupling stages.
Innovation Solution
The implementation of multiple inductively coupled BAW oscillators and coupling stages, along with combiner circuitry, generates multi-phase oscillator signals with low RMS jitter and high power-jitter FOM. Phase calibration mechanisms are also introduced to reduce phase errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple BAW oscillators and coupling stages are used to generate multi-phase signals, then the power-jitter FOM is improved, but the device complexity increases
Solution Approach 1:
The oscillator system is divided into multiple independent BAW oscillator units (first BAW oscillator, second BAW oscillator) that each generate signals independently. These segmented oscillators are then combined through coupling stages to produce multi-phase output signals, achieving low jitter through diversity while maintaining manageable complexity through modular architecture
Solution Approach 2:
Multiple BAW oscillators and coupling stages are merged into an integrated multi-phase oscillator system. The outputs of individual oscillators are combined through coupling stages to generate multi-phase signals with improved power-jitter FOM, achieving better performance through consolidation of multiple components
2Measurement precision
If phase calibration mechanisms are added to reduce phase errors, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Phase calibration mechanisms implement feedback control to detect and correct phase errors in the multi-phase oscillator signals. The system continuously monitors phase relationships and adjusts oscillator parameters to maintain accurate phase alignment, improving measurement precision through closed-loop control
Solution Approach 2:
Phase calibration is performed in advance or continuously to pre-establish accurate phase relationships before signal generation. By calibrating phase offsets beforehand, the system ensures precise phase alignment without requiring complex real-time adjustment mechanisms during operation
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 configuration 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), enhancing the performance of multi-phase 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 first BAW oscillator is configured to generate a first output signal at a frequency. The second BAW oscillator is coupled to the first coupling stage, and is configured to generate a second output signal at the frequency
Implementation Method 3
The first coupling stage is coupled to the first BAW oscillator, and is configured to amplify 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
Data Source
AI summary
An apparatus comprises: a first oscillator circuit having a first terminal and a second terminal; a second oscillator circuit having a third terminal and a fourth terminal; a first circuit having a first positive input, a first negative input, a first positive output, and a first negative output, the first positive input coupled to the first terminal, the first negative input coupled to the second terminal, the first positive output coupled to the third terminal, and the first negative output coupled to the fourth terminal; and a second circuit having a second positive input, a second negative input, a second positive output, and a second negative output, the second positive input coupled to the fourth terminal, the second negative input coupled to the third terminal, the second positive output coupled to the first terminal, and the second negative output coupled to the second terminal.