Voltage Controlled Oscillator Using Split Ring Resonator and Integrated Circuit
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Solution Overview
Problem
Voltage controlled oscillators using split ring resonators (SRRs) with meta-material characteristics on printed circuit boards (PCBs) face challenges in achieving low phase noise while maintaining a compact size, as the integration of resonators and energy compensation circuits often results in a large area and limited frequency selectivity.
Innovation Solution
A hybrid voltage controlled oscillator design featuring SRRs with meta-material characteristics on PCBs and an energy compensation circuit implemented as an integrated circuit, allowing for selective resonance across multiple frequencies using switches and a negative resistance circuit, thereby maintaining high quality factor and reducing area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a split ring resonator (SRR) with meta-material characteristics is installed on a printed circuit board (PCB), then phase noise performance is improved, but the device area becomes large
Solution Approach 1:
The oscillator is divided into two separate parts: the SRR resonator is fabricated on a PCB while the energy compensation circuit is implemented as a separate integrated circuit. This segmentation allows the PCB to be smaller since it only needs to accommodate the SRR, while the IC handles the compensation functions, thus reducing the overall device area while maintaining phase noise performance.
Solution Approach 2:
A coupling mechanism is introduced to connect the SRR on the PCB with the energy compensation circuit in the integrated circuit form. This intermediary coupling structure enables the two separate components to work together as a unified oscillator system, allowing the SRR to provide high quality factor while the compact IC provides energy compensation, thereby reducing total area.
2Area of stationary object
If an integrated circuit type voltage controlled oscillator is used, then the area is small, but phase noise performance deteriorates
Solution Approach 1:
The invention merges the advantages of two different approaches by combining the high quality factor SRR resonator (typically used in PCB implementations) with the compact energy compensation circuit (typically used in integrated circuits). The SRR provides excellent phase noise characteristics while the integrated circuit implementation of the compensation network maintains compact size, achieving both low phase noise and small area.
3Adaptability or versatility
If multiple SRRs operating at different frequencies are formed on a PCB, then frequency selectivity is enhanced, but device complexity increases
Solution Approach 1:
Multiple switches are introduced to dynamically select which SRR resonator is active at any given time. These switches allow the system to transition between different frequency bands by connecting the energy compensation circuit to different SRRs based on the desired operating frequency, thereby enhancing frequency selectivity while managing device complexity through controlled switching.
Solution Approach 2:
The energy compensation circuit is designed as a universal component that can work with multiple different SRR resonators operating at different frequencies. This multi-functional compensation circuit, combined with switching mechanisms, allows a single circuit design to support multiple frequency bands, enhancing adaptability without proportionally increasing complexity.
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 solution achieves stable oscillation with improved phase noise performance and compact size, enabling frequency tuning across multiple bands while maintaining high quality factor characteristics, making it suitable for various applications requiring low phase noise and high selectivity.
Implementation Method 1
a split ring resonator (SRR) configured to have meta-material characteristics fabricated on a board
Implementation Method 2
the SRRs operating at different frequencies; an energy compensation circuit configured to cause resonant oscillation of the SRR
Implementation Method 3
the energy compensation circuit further comprises a negative resistance circuit
Data Source
AI summary
A voltage controlled oscillator includes a split ring resonator (SRR) configured to have meta-material characteristics fabricated on a board, and an energy compensation circuit configured to cause resonant oscillation of the SRR. The energy compensation circuit is fabricated in the form of an integrated circuit.