Transformer-Coupled RF Oscillator for Wide Tuning Without Noise Penalty
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Radio frequency oscillators with high tuning ranges face challenges of increased noise floor and size, particularly when implemented as RFICs on semiconductor substrates, with existing solutions either consuming more power or requiring larger die areas.
Innovation Solution
A radio frequency oscillator design that utilizes a resonator circuit capable of operating in both differential and common modes, with different resonance frequencies, allowing for a single resonator circuit to provide both modes of operation without increasing size or noise, using a transformer-based structure with varying coupling factors to achieve efficient tuning.
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 die area and power consumption increase
Solution Approach 1:
The patent employs a single resonator circuit that can operate in multiple resonance modes (fundamental mode, third harmonic mode, fifth harmonic mode) to provide a wide tuning range. This multi-functional approach allows one resonator circuit to replace what would traditionally require multiple separate resonator circuits, thereby reducing die area while maintaining extensive frequency coverage from 0.5 GHz to 6 GHz
Solution Approach 2:
The resonator circuit is designed with specific winding configurations (e.g., 8-shape coils, distributed LC resonators) that create multiple distinct resonance modes within a single physical structure. By segmenting the resonance frequencies into different modes (fundamental, third harmonic, fifth harmonic), the patent achieves wide tuning range without requiring multiple separate resonator circuits
2Adaptability or versatility
If mode switching is used to increase tuning range, then the tuning range is improved, but the LC resonator circuit size increases
Solution Approach 1:
The patent designs the LC resonator circuit to inherently support multiple resonance modes (fundamental, third harmonic, fifth harmonic) within a single compact structure. This eliminates the need for physically larger resonator circuits that would be required if separate circuits were used for each mode, achieving both wide tuning range and compact size
Solution Approach 2:
The patent employs switching mechanisms that dynamically change the resonance mode of the LC resonator circuit based on the desired operating frequency. By dynamically switching between fundamental mode, third harmonic mode, and fifth harmonic mode, the circuit achieves wide tuning range while maintaining a compact physical size
3Adaptability or versatility
If high frequency multiplexers are employed to achieve high tuning range, then the tuning range is improved, but the noise floor and power consumption increase
Solution Approach 1:
The patent eliminates the need for high frequency multiplexers by directly implementing multiple resonance modes within the LC resonator circuit itself. By extracting the frequency multiplication function from separate multiplexer circuits and integrating it into the resonator's inherent harmonic modes, the patent reduces noise floor and power consumption while maintaining wide tuning range
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 noise floor, suitable for compact RFIC implementation, while maintaining performance across both differential and common modes without area penalties.
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, 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
Implementation Method 2
using a transformer-based structure with varying coupling factors to achieve efficient tuning
Data Source
AI summary
The embodiments of the invention relate to a radio frequency oscillator, the radio frequency oscillator comprising a resonator circuit 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 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 configured to excite the resonator circuit in the common mode to obtain a common mode oscillator signal oscillating at the common mode resonance frequency.