RF Amplifier Module Inductor Coupling for Harmonic Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Parasitic inductors on wires connecting the output terminal of a FET to a series resonant circuit affect the frequency characteristics of the amplifier circuit, preventing effective removal of harmonic waves and degrading amplification efficiency.
Innovation Solution
A high frequency module with a matching circuit and a harmonic wave endpoint circuit, where the first and second inductors are arranged to create differential coupling of magnetic fields, reducing the impact of parasitic inductance and enhancing the efficiency of the amplifier circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a series resonant circuit is used to remove harmonic waves, then amplification efficiency can be improved, but parasitic inductors on connecting wires affect frequency characteristics and prevent sufficient harmonic wave removal
Solution Approach 1:
A parasitic inductor compensation circuit is introduced as an intermediary element to counteract the harmful effects of parasitic inductors on connecting wires. The compensation circuit includes inductors with opposite polarity connections that generate compensating voltages to cancel out the voltage drops caused by parasitic inductance, thereby restoring the frequency characteristics and harmonic wave removal performance of the series resonant circuit.
Solution Approach 2:
The patent applies preliminary anti-action by pre-configuring the parasitic inductor compensation circuit to counteract the harmful effects of parasitic inductance before they degrade the amplifier's performance. The compensation circuit is designed with inductors connected in opposite polarity to the parasitic inductors, creating opposing voltages that neutralize the harmful effects on frequency characteristics before they can significantly impact amplification efficiency.
2Ease of operation
If wire connections are made between FET output terminal and series resonant circuit, then circuit functionality is achieved, but parasitic inductors are introduced that degrade performance
Solution Approach 1:
The patent converts the harmful parasitic inductance into a beneficial effect by introducing compensation inductors with opposite polarity. The parasitic inductors that were previously causing performance degradation are now compensated for by the opposing magnetic fields generated by the compensation circuit, transforming the harmful inductive effect into a neutralized state that allows the circuit to function optimally.
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 differential coupling of inductors improves amplification efficiency by reducing second-order harmonic waves and optimizing frequency characteristics, allowing for efficient use of voltage amplitude.
Implementation Method 1
The first inductor and the second inductor are arranged so that a magnetic field occurring at the first inductor and a magnetic field occurring at the second inductor are differentially coupled
Data Source
AI summary
A high frequency module includes an amplifier circuit, a matching circuit, and a harmonic wave endpoint circuit. The amplifier circuit has an output terminal. The matching circuit is connected to the output terminal of the amplifier circuit, and includes a first inductor. The harmonic wave endpoint circuit connects the output terminal of the amplifier circuit and ground together, and includes a second inductor. The first inductor and the second inductor are arranged so that a magnetic field occurring at the first inductor and a magnetic field occurring at the second inductor are differentially coupled.