Dual VCXO Layout Near Ground for Stable High-Frequency Output
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Solution Overview
Problem
Existing oscillators with multiple quartz crystal oscillation units on a single substrate face challenges in stabilizing higher frequency outputs due to limited design freedom and positional dependencies, leading to unstable frequency outputs.
Innovation Solution
The oscillator design includes a circuit board with a first and second oscillator circuit, where the second oscillator circuit with a higher output frequency is placed closer to the ground terminal, stabilizing both output frequencies, and optionally incorporates a multiplier circuit configuration with the second multiplier circuit positioned closer to the ground terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If two quartz crystal oscillation units are placed on a single substrate to reduce oscillator size, then the device becomes more compact, but the output frequency stability of higher frequency oscillators deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the placement positions of oscillators based on their frequency characteristics. High-frequency oscillators are positioned closer to the ground terminal where electromagnetic interference is lower, while low-frequency oscillators are placed farther away. This localized optimization of placement positions based on specific oscillator requirements resolves the contradiction by maintaining frequency stability for high-frequency oscillators while still integrating multiple oscillators on a single substrate.
2Device complexity
If multiple oscillator circuits are integrated on a single substrate, then device complexity is reduced, but design freedom is limited leading to unstable high-frequency output
Solution Approach 1:
The patent implements local quality by creating distinct placement zones on the substrate based on electromagnetic characteristics. The ground terminal region is identified as having lower electromagnetic interference, making it suitable for high-frequency oscillators. This localized differentiation allows multiple oscillator circuits to coexist on a single substrate while maintaining the stability of high-frequency outputs through appropriate spatial positioning.
Data Source
AI summary
An oscillator includes a circuit board including a supporting substrate (base member), a first VCXO (a first oscillator circuit), a second VCXO (a second oscillator circuit), and a ground terminal (terminal for ground). The first VCXO and the second VCXO are configured such that a second output frequency that is output from the second VCXO is higher than a first output frequency that is output from the first VCXO. The second VCXO is placed closer to the ground terminal than the first VCXO.