Dual-Mode RF Oscillator Using One Resonator for Wide Tuning
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Solution Overview
Problem
Radio frequency oscillators with high tuning ranges suffer from increased noise floor and size issues, particularly when implemented as RFICs on semiconductor substrates, due to the need for separate resonator circuits and high frequency multiplexers or mode switching, which lead to power consumption and area penalties.
Innovation Solution
A radio frequency oscillator employing a single resonator circuit that operates in both differential and common modes, with different resonance frequencies, utilizing a transformer-based design with varying inductive coupling factors to achieve a high tuning range without increasing size or noise floor, using a first excitation circuit for differential mode and a second for common mode oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate resonator circuits are employed to achieve high tuning range, then the tuning range is improved, but the device area and power consumption increase
Solution Approach 1:
The patent applies a single resonator circuit that can operate in multiple modes (differential mode and common mode) to provide wide tuning range. The resonator circuit is designed with coupling elements that enable it to function as both a differential resonator and a common-mode resonator, eliminating the need for separate resonator circuits while maintaining broad frequency coverage.
Solution Approach 2:
The patent merges the functionality of multiple resonator circuits into a single integrated resonator structure. By combining differential-mode and common-mode resonance capabilities in one circuit, the design achieves the tuning range of multiple circuits without requiring the physical space and resources of separate implementations.
2Adaptability or versatility
If high frequency multiplexers are used to increase tuning range, then the tuning range is improved, but the noise floor increases
Solution Approach 1:
The patent extracts and eliminates the need for high-frequency multiplexers from the oscillator design. By using a single resonator circuit that naturally supports multiple resonance modes, the design removes the multiplexer component that would otherwise be required to switch between different frequency ranges, thereby eliminating the noise and power consumption associated with multiplexer operation.
3Adaptability or versatility
If mode switching between even and odd resonance modes is employed, then the tuning range is improved, but the LC resonator circuit size increases
Solution Approach 1:
The patent designs a single LC resonator circuit that universally supports both even and odd resonance modes simultaneously through its coupling structure. This multi-functional design allows the same physical circuit to access multiple frequency ranges without requiring additional components or increasing in size, as the circuit inherently supports mode switching without needing separate resonator structures.
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 approach allows for a compact, efficient radio frequency oscillator with a high tuning range and low phase noise, suitable for RFICs, by leveraging the difference in magnetic coupling between differential and common modes to provide dual-mode operation without area penalties or degradation in performance.
Implementation Method 1
a resonator circuit being resonant at an excitation of the resonator circuit in a differential mode and at an excitation of the resonator circuit in a common mode... due to a different magnetic or inductive coupling factor, km, when the resonator circuit is excited in the differential mode or the common mode
Data Source
AI summary
The invention relates to a radio frequency oscillator, the radio frequency oscillator comprising a resonator circuit being resonant at an excitation of the resonator circuit in a differential mode and at an excitation of the resonator circuit in a common mode, wherein the resonator circuit has a differential mode resonance frequency at the excitation in the differential mode, and wherein the resonator circuit has a common mode resonance frequency at the excitation in the common mode, a first excitation circuit being configured to excite the resonator circuit in the differential mode to obtain a differential mode oscillator signal oscillating at the differential mode resonance frequency, and a second excitation circuit being configured to excite the resonator circuit in the common mode to obtain a common mode oscillator signal oscillating at the common mode resonance frequency.