Negative-Resistance Frequency Multiplier for Stable Wideband Output

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Solution Overview

Problem

Existing frequency multipliers face challenges in balancing bandwidth, energy efficiency, and power consumption, particularly due to energy loss in resonant cavities and issues like injection locking and high power supply voltage.

Innovation Solution

A frequency multiplier design incorporating a negative resistance unit formed by feedback and parasitic capacitors to supplement energy loss in resonant cavities, coupled with cross-coupled switching transistors to reduce common-mode interference and injection locking, and an inductor to increase voltage, thereby improving energy efficiency and bandwidth.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a conventional frequency multiplier design is used, then the frequency multiplication function is achieved, but energy loss in the resonant cavity increases and energy efficiency deteriorates

Engineering Contradiction:

Improveenergy loss in resonant cavityVSAvoidenergy efficiency

Core Design Contradiction:

Loss of energyVSUse of energy by moving object

Solution Approach 1:

The patent converts the harmful energy loss in the resonant cavity into a beneficial effect by introducing a negative resistance unit. This unit uses the parasitic capacitance of existing transistors combined with feedback capacitors to generate negative resistance that compensates for and cancels the energy loss, thereby improving energy efficiency without adding significant complexity

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent implements feedback mechanisms through feedback capacitors that connect the output of the resonant cavity back to the negative resistance unit. This feedback loop enables the system to monitor and compensate for energy loss dynamically, maintaining optimal energy efficiency across varying operating conditions and frequencies

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the resonant cavity is used for frequency multiplication, then the frequency output is achieved, but the bandwidth is limited

Engineering Contradiction:

ImprovebandwidthVSAvoidfrequency stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces dynamic elements through the negative resistance unit and feedback mechanisms that allow the system to adapt to different frequency conditions. The negative resistance compensates for cavity losses across a broader frequency range, enabling the frequency multiplier to maintain stability while operating over an extended bandwidth compared to conventional fixed designs

Inventive Principle:

Principle #15Dynamics

3Power

If conventional frequency multiplication methods are used, then the frequency output is achieved, but power consumption increases

Engineering Contradiction:

Improvepower consumptionVSAvoidenergy efficiency

Core Design Contradiction:

PowerVSUse of energy by moving object

Solution Approach 1:

The patent converts the parasitic capacitance, which is normally a source of loss and inefficiency, into a useful resource for generating negative resistance. By utilizing the inherent parasitic capacitance of the transistors combined with feedback capacitors, the system creates a power-efficient mechanism that reduces overall power consumption while maintaining frequency multiplication performance

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Enhances energy efficiency, reduces power consumption, and optimizes bandwidth by supplementing energy loss and reducing noise and interference, allowing stable operation and improved signal quality.

Implementation Method 1

The negative resistance unit includes a feedback capacitor and a parasitic capacitor. The feedback capacitor and the parasitic capacitor collectively provide negative resistance for the resonant cavity.

Methodology Applied

Scientific EffectNegative resistance:

Implementation Method 2

The resonant cavity performs resonant amplification on one of the plurality of harmonic components, to obtain the intrinsic signal.

Methodology Applied

Scientific EffectResonant amplification: Resonance

Implementation Method 3

The inductor is electrically connected between the harmonic generator and the oscillator. The inductor is disposed between the oscillator and the harmonic generator, to increase a voltage of the harmonic signal

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS20260025127A1Frequency multiplier and wireless communication device

Publication Date: 2026.01.22 HUAWEI TECH CO LTD

AI summary

A frequency multiplier includes an oscillator and a harmonic generator. The oscillator has a resonant cavity and a negative resistance unit. The negative resistance unit includes a feedback capacitor and a parasitic capacitor. The feedback capacitor and the parasitic capacitor collectively provide negative resistance for the resonant cavity. The harmonic generator is configured to generate a harmonic signal based on a fundamental frequency signal taken as input. The oscillator is electrically connected to the harmonic generator, and is configured to receive the harmonic signal, and to output an intrinsic signal with the resonant cavity. A frequency of the intrinsic signal is a multiple of a frequency of the fundamental frequency signal.