Harmonic Oscillator Tuning via Harmonic Current Selection
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Solution Overview
Problem
Existing harmonic oscillators face performance degradation due to changes in noise coefficient when fundamental frequency is tuned, requiring synchronous tuning of harmonic impedances, which increases complexity and time.
Innovation Solution
A harmonic oscillator design that selects harmonic current to suppress second harmonic current and promote third harmonic current, avoiding the need for synchronous tuning of harmonic impedances by creating a smooth third harmonic impedance, thus maintaining amplitude and phase of third harmonic voltage unchanged during tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous tuning of fundamental frequency and harmonic impedance is performed, then the amplitude and phase of harmonic voltage remain unchanged, but the tuning difficulty and time increase greatly
Solution Approach 1:
The patent extracts the harmonic impedance tuning function from the manual tuning process by introducing a harmonic current selection module that automatically selects and suppresses specific harmonic currents (e.g., second harmonic) while promoting others (e.g., third harmonic), thereby eliminating the need for manual synchronous tuning of harmonic impedances
Solution Approach 2:
The oscillator circuit performs self-tuning of harmonic characteristics through the harmonic current selection module that automatically adjusts harmonic current composition based on the operating state, eliminating the need for external manual intervention in harmonic impedance tuning
2Adaptability or versatility
If fundamental frequency is tuned, then the frequency coverage is improved, but the noise coefficient deviates from optimal value
Solution Approach 1:
The patent changes the composition parameters of harmonic currents by selectively suppressing certain harmonic currents (e.g., second harmonic) and promoting others (e.g., third harmonic) through the harmonic current selection module, thereby maintaining optimal noise characteristics across different fundamental frequency settings
Solution Approach 2:
The harmonic current selection module acts as an intermediary between the fundamental frequency tuning mechanism and the noise coefficient performance, mediating the relationship by automatically adjusting harmonic current composition to compensate for frequency tuning effects on noise characteristics
Data Source
AI summary
A harmonic oscillator realizing harmonic tuning based on harmonic current selection is provided. The harmonic oscillator includes a first MOS transistor M1, a second MOS transistor M2, a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a fifth inductor L5, a first variable capacitor C1, a second capacitor C2, a first fixed capacitor C3, a second fixed capacitor C4 and a switched capacitor array SCA. By suppressing a second harmonic current and promoting a third harmonic current, the invention avoids the design complexity caused by synchronous tuning of two types of harmonic impedances. By suppressing a second harmonic current and promoting a third harmonic current, the design complexity caused by synchronous tuning of two types of harmonic impedances is avoided.