Single-Resonator RF Oscillator with Differential and Common Modes
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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 design that utilizes a single resonator circuit resonant in both differential and common modes, with different resonance frequencies, excited by separate circuits to provide dual-mode oscillator signals, allowing for a compact and efficient structure with a high tuning range without area penalties or degradation in performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate resonator circuits are employed to provide high tuning range, then the tuning range is improved, but the device area and power consumption increase
Solution Approach 1:
The patent employs 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 mode resonator and a common mode resonator, eliminating the need for separate resonator circuits and reducing device area while maintaining high adaptability across multiple frequency bands.
Solution Approach 2:
The patent merges the functions of multiple resonator circuits into a single resonator circuit by introducing coupling elements between differential mode resonators. This combination allows the circuit to support both differential mode and common mode oscillations, providing wide tuning range with reduced area and power consumption compared to using separate resonator circuits.
2Adaptability or versatility
If separate resonator circuits with high frequency multiplexers are used, then the tuning range is improved, but the noise floor increases
Solution Approach 1:
The patent combines differential mode resonators with coupling elements to form a unified resonator circuit that supports both differential and common mode operations. This merging eliminates the need for high frequency multiplexers that switch between separate resonator circuits, thereby reducing the noise floor while maintaining wide tuning range capability.
3Adaptability or versatility
If mode switching of high-order LC resonator circuit is employed, then the tuning range is improved, but the size of the resonator circuit increases
Solution Approach 1:
The patent designs the resonator circuit with inherent multi-functionality by incorporating coupling elements that enable both differential mode and common mode oscillations. This allows the same physical resonator circuit structure to provide wide tuning range through mode switching without requiring a high-order LC resonator circuit, thereby reducing the resonator circuit size while maintaining high adaptability.
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 enables a compact radio frequency oscillator with a high tuning range and low size, suitable for RFICs, while maintaining low phase noise and efficient area usage, by leveraging the difference in magnetic coupling factors between differential and common modes.
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, k m , when the resonator circuit is excited in the differential mode or the common mode
Data Source
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AI summary
The invention relates to a radio frequency oscillator (100), the radio frequency oscillator (100) comprising a resonator circuit (101) being resonant at an excitation of the resonator circuit (101) in a differential mode and at an excitation of the resonator circuit (101) in a common mode, wherein the resonator circuit (101) has a differential mode resonance frequency at the excitation in the differential mode, and wherein the resonator circuit (101) has a common mode resonance frequency at the excitation in the common mode, a first excitation circuit (103) being configured to excite the resonator circuit (101) in the differential mode to obtain a differential mode oscillator signal oscillating at the differential mode resonance frequency, and a second excitation circuit (105) being configured to excite the resonator circuit (101) in the common mode to obtain a common mode oscillator signal oscillating at the common mode resonance frequency.