Parallel Quartz Resonator Oscillator for Low Phase Noise
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Solution Overview
Problem
Oscillators are sensitive to acceleration, leading to frequency modulation and increased phase noise, which affects the stability and purity of the oscillating signal, particularly in electronic devices.
Innovation Solution
An oscillating device is designed with a first quartz crystal resonator and at least two second quartz crystal resonators operating in parallel, along with a first and second waveform adjustment circuit, to reduce acceleration sensitivity and phase noise by generating and adjusting oscillating signals to isolate load variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single quartz crystal resonator is used in the oscillator, then the device structure is simple, but the acceleration sensitivity is high and phase noise increases
Solution Approach 1:
The oscillator is divided into multiple independent resonator units (first quartz crystal resonator and at least two second quartz crystal resonators) that operate in parallel. Each resonator processes the oscillating signal independently, and their combined output reduces the overall acceleration sensitivity through diversification of the oscillation paths.
2Device complexity
If a single quartz crystal resonator is used, then the circuit is simple, but phase noise is increased
Solution Approach 1:
The signal generation is segmented into multiple parallel resonator paths. Each resonator contributes to the overall oscillating signal, and the combination of multiple independent signal sources reduces phase noise through statistical averaging and diversification of noise sources.
Solution Approach 2:
The oscillating signals from multiple quartz crystal resonators are merged together in parallel. The combining of multiple clean signal sources with different phase noise characteristics results in an overall signal with reduced phase noise and improved purity.
3Object-affected harmful factors
If multiple quartz crystal resonators are used in parallel, then acceleration sensitivity is reduced, but device complexity increases
Solution Approach 1:
The oscillator is segmented into multiple resonator units with different orientation configurations. This segmentation allows each resonator to be optimally oriented to minimize its individual acceleration sensitivity, and the parallel combination further reduces the overall sensitivity through diversification.
Solution Approach 2:
Each quartz crystal resonator is configured with specific local quality characteristics, including different orientation angles and mounting configurations, to optimize their individual performance. The first resonator and second resonators have different local orientations that collectively minimize the overall acceleration sensitivity of the oscillator system.
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 device effectively reduces acceleration sensitivity and phase noise, providing a stable and pure oscillating signal by utilizing multiple quartz crystal resonators and adjustment circuits to manage signal frequencies and load variations.
Implementation Method 1
The first quartz crystal resonator has a first resonant frequency. The driving circuit is coupled to the first quartz crystal resonator. The driving circuit is configured to drive the first quartz crystal resonator to generate a first oscillating signal having the first resonant frequency. The second quartz crystal resonators have a second resonant frequency. The second quartz crystal resonators are configured to receive and rectify the first oscillating signal to generate a second oscillating signal having the second resonant frequency.
Implementation Method 2
The first quartz crystal resonator has a first resonant frequency. The second quartz crystal resonators have a second resonant frequency. The driving circuit is configured to drive the first quartz crystal resonator to generate a first oscillating signal having the first resonant frequency.
Data Source
AI summary
An oscillating device includes a first quartz crystal resonator, a driving circuit, a first waveform adjustment circuit, and at least two second quartz crystal resonators. The first quartz crystal resonator has a first resonant frequency. The driving circuit, coupled to the first quartz crystal resonator, drives the first quartz crystal resonator to generate a first oscillating signal having the first resonant frequency. The second quartz crystal resonators, coupled in parallel and coupled to the driving circuit and the first quartz crystal resonator, have a second resonant frequency and receive and rectify the first oscillating signal to generate a second oscillating signal having the second resonant frequency. The first waveform adjustment circuit, coupled to the second quartz crystal resonators, receives the second oscillating signal and adjusts the second oscillating signal to generate a first waveform adjustment signal.