Clipped Oscillator Circuit for Lower Phase Noise Generation
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Solution Overview
Problem
Conventional oscillators face limitations in minimizing phase noise due to noise conversion mechanisms, particularly at zero crossings and peak amplitudes, which restrict the achievable phase noise performance despite optimizations in tank Q and active device noise contributions.
Innovation Solution
The proposed oscillator circuit incorporates a clipping element and amplification stages to generate a clipped signal, reducing noise-to-phase noise conversion by moderating the impulse sensitivity function (ISF), thereby minimizing phase noise while maintaining high output swing and noise factor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If tank Q is maximized to minimize phase noise, then phase noise performance improves, but device complexity and circuit optimization difficulty increase
Solution Approach 1:
The patent applies parameter changes by systematically optimizing tank circuit parameters (inductance L, capacitance C, quality factor Q) and active device parameters (transconductance gm, bias current) to achieve minimum phase noise. The design process involves selecting specific parameter ranges and iterating through multiple design cycles to find the optimal combination that minimizes phase noise while maintaining practical circuit complexity.
2Object-affected harmful factors
If metal trace width is increased to reduce series resistance, then inductor quality factor improves, but self-inductance and oscillation frequency decrease
Solution Approach 1:
The patent resolves this contradiction by systematically varying the metal trace width parameter and observing its dual effect on series resistance and self-inductance. The design process involves selecting an optimal trace width that achieves acceptable series resistance levels while maintaining the target oscillation frequency, often requiring iterative adjustments and compensation through other circuit parameters.
Data Source
AI summary
The invention relates to an oscillator circuit, comprising a clipping element for generating a clipped signal, and a first amplification stage for amplifying and filtering the clipped signal to obtain a filtered signal, wherein the clipping element is configured to generate the clipped signal upon the basis of the filtered signal.