PCB Cavity Resonator Oscillator Layout for Low Phase Noise
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Solution Overview
Problem
Existing oscillator devices with cavity resonators face challenges in achieving low phase noise, particularly at high frequencies, due to bulky assembly and critical coupling structure requirements, which limit tunability and increase phase noise levels.
Innovation Solution
An oscillator device with a cavity resonator integrated onto a circuit board, utilizing via connections to minimize the distance between the active circuit device and the resonator, and incorporating a tuning element with a movable conducting body for frequency adjustment, allowing for broadband tuning and low phase noise performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cavity resonator is used to achieve low phase noise, then phase noise performance is improved, but the device size and assembly complexity increase
Solution Approach 1:
The patent integrates the cavity resonator directly onto the circuit board, merging previously separate components (cavity, circuit board, active device) into a single integrated structure. This eliminates bulky external connections and simplifies assembly while maintaining the high Q-factor needed for low phase noise performance
Solution Approach 2:
The cavity resonator is positioned on the opposite side of the circuit board from the active device, with excitation via connections running through the board. This nested arrangement allows compact integration of all oscillator components within a small volume, reducing overall device size while preserving cavity resonator functionality
2Reliability
If the distance between active device and cavity resonator is reduced, then phase noise is reduced, but coupling impedance becomes more critical and difficult to control
Solution Approach 1:
The patent creates a localized coupling structure through via connections embedded in the circuit board, concentrating the coupling function in a specific controlled region. This local quality approach allows precise control of coupling impedance through via geometry and positioning, enabling short distances for low phase noise while maintaining manufacturability
3Adaptability or versatility
If a tuning mechanism is added to the cavity resonator, then frequency tunability is improved, but the device size and structural complexity increase
Solution Approach 1:
The patent extracts the tuning function from complex mechanical mechanisms (screws, trombones) and implements it through a simplified movable conducting body that can be positioned within the cavity. This extracted approach provides frequency tuning capability while minimizing structural complexity and device size
Solution Approach 2:
The patent replaces traditional mechanical tuning mechanisms with an electrically controllable movable conducting body, substituting complex mechanical systems with a simpler structure that achieves the same frequency tuning function through electrical actuation rather than manual mechanical adjustment
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 enables a compact, high-Q cavity resonator with reduced phase noise, facilitating easier assembly and enhanced tunability, while maintaining optimal oscillation conditions and impedance stability.
Implementation Method 1
the oscillator device further comprises a cavity resonator
Implementation Method 2
at least one excitation via connection that runs through the circuit board and electrically connects the active circuit device to an excitation structure inside the cavity resonator
Data Source
AI summary
The present disclosure relates to an oscillator device (1, 1′, 1″, 1′″) comprising an active circuit device (2, 2′″), a circuit board (3) and a cavity resonator (4, 4′). The active circuit device (2, 2′″) comprises an amplifier unit (5), and the circuit board (3) comprises a first main side (6) and a second main side (7), where the active circuit device (2, 2′″) is mounted to the first main side (6). The cavity resonator (4, 4′) is positioned on the second main side (7). The oscillator device (1) further comprises at least one excitation via connection (8) that runs through the circuit board (3) and electrically connects the active circuit device (2, 2′″) to an excitation structure (9) inside the cavity resonator (4, 4′).