Power Amplifier Harmonic Circuit Integration for Impedance Control
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Solution Overview
Problem
Conventional power amplifiers face difficulties in setting desired harmonic impedance due to parasitic inductance and resistance caused by external harmonic circuits, which hinders efficient power-added efficiency, especially at high frequencies.
Innovation Solution
Integrating a harmonic circuit between the source electrode and gate wiring, in proximity to the transistor, reduces parasitic inductance and resistance, allowing for easier impedance setting and improved power-added efficiency by maintaining harmonic phase based on capacitive reactance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a harmonic circuit is provided outside the transistor using wires or wiring elements, then the harmonic circuit can be implemented, but parasitic inductance and parasitic resistance are caused making it difficult to set the desired harmonic impedance
Solution Approach 1:
The harmonic circuit is merged with the transistor by integrating it directly into the transistor structure. The capacitor of the harmonic circuit is formed using the gate electrode and gate wiring of the transistor itself, eliminating the need for separate external wiring elements that would introduce parasitic inductance and resistance.
Solution Approach 2:
The harmful parasitic elements (inductance and resistance) are extracted from the system by removing external wiring elements. The harmonic circuit is reconfigured to use only the essential transistor components (gate electrode and gate wiring) without additional external connections, thereby eliminating the source of parasitic effects.
2Ease of manufacture
If external wiring elements are used to connect the harmonic circuit, then the circuit can be assembled, but manufacturing precision is reduced due to difficulty in setting desired impedance
Solution Approach 1:
The harmonic circuit components are merged with the transistor fabrication process. The capacitor is formed using the gate electrode and gate wiring that are already part of the transistor structure, allowing the harmonic circuit to be manufactured simultaneously with the transistor without requiring separate assembly steps for external wiring elements.
3Area of stationary object
If the harmonic circuit is disposed far from the transistor, then layout flexibility is improved, but parasitic inductance and resistance increase reducing power-added efficiency
Solution Approach 1:
The harmonic circuit is merged with the transistor by using the gate electrode and gate wiring as integral components. This integration places the harmonic circuit at the optimal location (at the gate) without requiring additional layout space or creating distance-related parasitic effects, thereby maintaining both layout flexibility and energy efficiency.
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 configuration enhances power-added efficiency by reducing parasitic components, facilitating harmonic impedance matching and stabilizing phase, particularly at high frequencies, while allowing for broader frequency operation and reduced manufacturing variations.
Implementation Method 1
maintaining harmonic phase based on capacitive reactance
Data Source
AI summary
A power amplifier includes: a transistor having a gate electrode, a source electrode and a drain electrode; a passive component part connected to the gate electrode through a gate wiring; and a harmonic circuit connected between the source electrode and the gate wiring and disposed in a region between the gate electrode and the passive component part and between the source electrode and the gate wiring.