Transformer-Based RF Oscillator for Wide Tuning Without Noise Penalty
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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.
Innovation Solution
A radio frequency oscillator design that utilizes a single resonator circuit resonant in both differential and common modes, with distinct resonance frequencies, excited by separate circuits to provide dual-mode operation without area penalties or degradation in performance, employing a transformer-based resonator circuit with varying coupling factors for differential and common modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate resonator circuits are used to achieve high tuning range, then the tuning range is improved, but the device size and noise floor increase
Solution Approach 1:
The patent applies multi-functionality by designing a single resonator circuit that can operate in multiple modes (differential mode and common mode) to provide wide tuning range. The resonator circuit is configured 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 multiple resonator functions into a single integrated resonator circuit. By combining differential-mode and common-mode resonance capabilities in one circuit structure with shared inductors and capacitors, the design achieves wide tuning range without the area penalty of multiple separate resonators.
2Adaptability or versatility
If separate resonator circuits are used to achieve high tuning range, then the tuning range is improved, but the noise floor increases
Solution Approach 1:
The resonator circuit is designed to provide multiple resonance modes (differential and common-mode) within a single structure, enabling wide tuning range without requiring multiple separate resonators that would each contribute to the noise floor. The unified structure reduces overall noise while maintaining adaptability across frequency bands.
3Adaptability or versatility
If high frequency multiplexers are used to increase tuning range, then the tuning range is improved, but power consumption and noise floor increase
Solution Approach 1:
The resonator circuit is designed to provide multiple resonance modes (differential and common-mode) within a single structure, enabling wide tuning range without requiring multiple separate resonators that would each contribute to the noise floor. The unified structure reduces overall noise while maintaining adaptability across frequency bands.
4Adaptability or versatility
If mode switching in high-order LC resonator is used to increase tuning range, then the tuning range is improved, but the LC resonator circuit size increases
Solution Approach 1:
The resonator circuit is designed to provide multiple resonance modes (differential and common-mode) within a single structure, enabling wide tuning range without requiring multiple separate resonators that would each contribute to the noise floor. The unified structure reduces overall noise while maintaining adaptability across frequency bands.
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 design achieves a high tuning range with reduced size and low noise floor, suitable for compact RFIC implementation, while maintaining efficient differential mode performance and extending tuning range through common mode oscillation without area or noise degradation.
Implementation Method 1
the resonator circuit is resonant at an excitation in a differential mode and at an excitation in a common mode. The resonator circuit can have different resonance frequencies when excited in the differential mode and the common mode
Implementation Method 2
This difference may be 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 disclosure relates to a radio frequency oscillator. The radio frequency oscillator includes 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. The resonator circuit has a differential mode resonance frequency at the excitation in the differential mode, and the resonator circuit has a common mode resonance frequency at the excitation in the common mode. A first excitation circuit is 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 is configured to excite the resonator circuit in the common mode to obtain a common mode oscillator signal oscillating at the common mode resonance frequency.