Resonant Tank Frequency Multiplier With Feedback Harmonic Suppression
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Solution Overview
Problem
Existing frequency multipliers face challenges with high power consumption and high noise levels, particularly in suppressing undesired harmonic components, and injection locked frequency multipliers have limited range issues.
Innovation Solution
A frequency multiplier design incorporating a harmonic generator with a feedback circuit that includes a harmonic generating core unit, a resonant tank, and a feedback circuit to control effective resistance and suppress harmonics, using an oscillation control loop to manage output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a phase locked loop is used for frequency multiplication, then frequency synthesis capability is improved, but power consumption increases and noise level increases
Solution Approach 1:
The patent extracts and removes the phase locked loop structure from the frequency multiplier, replacing it with a direct frequency multiplication approach using a resonant tank and feedback circuit. This eliminates the high power consumption and noise characteristics of the PLL while maintaining frequency synthesis capability through the resonant frequency determination.
Solution Approach 2:
The patent replaces the complex electronic control system of the phase locked loop with a simpler resonant-based system. The mechanical vibration analogy in the resonant tank replaces the electronic feedback control mechanism, achieving frequency multiplication with lower power consumption and noise.
2Adaptability or versatility
If a phase locked loop is used for frequency multiplication, then frequency synthesis capability is improved, but noise level increases
Solution Approach 1:
The patent removes the phase locked loop structure that generates high noise levels, replacing it with a resonant tank-based frequency multiplication approach. This extraction eliminates the noise-generating components while preserving frequency synthesis through resonant frequency selection.
3Device complexity
If a tuned frequency multiplier is used, then structure simplicity is improved, but harmonic suppression capability worsens
Solution Approach 1:
The patent introduces a feedback circuit that takes the output signal and feeds it back to the input through a specific path. This feedback mechanism selectively reinforces the desired frequency component while canceling out undesired harmonic components, achieving harmonic suppression without complicating the overall structure significantly.
Solution Approach 2:
The patent changes the effective resistance parameter of the resonant tank through the feedback circuit's action. By dynamically adjusting this parameter, the system achieves selective frequency enhancement and harmonic suppression, improving the harmonic rejection ratio while maintaining structural simplicity.
4Object-generated harmful factors
If an injection locked frequency multiplier is used to suppress harmonic components, then harmonic rejection ratio is improved, but adaptability worsens due to limited injection locked range
Solution Approach 1:
Instead of using injection locking to force frequency multiplication, the patent inverts the approach by using natural resonance and feedback to achieve frequency multiplication. The system responds to a broad range of input frequencies by selecting the resonant frequency, thereby achieving both harmonic suppression and wide adaptability without the limited injection locked range.
5Object-generated harmful factors
If feedback circuit is added to control effective resistance, then harmonic rejection ratio is improved, but device complexity increases
Solution Approach 1:
The feedback circuit is designed to perform multiple functions simultaneously: it controls the effective resistance of the resonant tank, suppresses harmonic components, and maintains the desired frequency multiplication. This multi-functionality achieves harmonic rejection without proportionally increasing device complexity, as a single feedback path accomplishes multiple objectives.
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 design reduces power consumption, improves harmonic rejection ratio, and maintains output impedance, effectively suppressing undesired harmonics while maintaining low power usage.
Implementation Method 1
a resonant tank connected to a first output terminal and a second output terminal of the harmonic generating core unit
Implementation Method 2
a first feedback circuit connected to the first output terminal and the second output terminal of the harmonic generating core unit to change effective resistance of the first resonant tank
Data Source
AI summary
A frequency multiplier is provided. A harmonic generator of the frequency multiplier comprises: a harmonic generating core unit; a first resonant tank which is connected to a first output terminal and a second output terminal of the harmonic generating core unit; and a first feedback circuit which is connected to the first output terminal and the second output terminal of the harmonic generating core unit to change the effective resistance of the first resonant tank.