Parallel Amplifier Resistor Layout for Oscillation Stability
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Solution Overview
Problem
Existing amplifiers with multiple amplification paths face issues of power density distribution non-uniformity, leading to excessive concentration and potential burning or discoloration of resistors due to loop oscillation and load fluctuations.
Innovation Solution
The amplifier design incorporates a resistive section with a resistor that tapers in width or thickness, paired with conductor patterns and wirings to distribute power evenly, preventing excessive power concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rectangular stabilization resistor having uniform thickness is used for oscillation suppression, then loop oscillation can be suppressed, but power density distribution becomes non-uniform and electric power is excessively concentrated at certain locations
Solution Approach 1:
The resistor is designed with non-uniform thickness, where the thickness varies along the length of the resistor. Specifically, the thickness is greater at the ends and smaller in the middle portion, creating local variations in resistance density that result in uniform power dissipation distribution across the entire resistor structure.
Solution Approach 2:
The physical parameter of the resistor (thickness) is changed from uniform to non-uniform along its length. This parameter modification alters the resistance distribution to compensate for the non-uniform current density, achieving uniform power density distribution while maintaining the oscillation suppression function.
2Power
If multiple amplification paths are provided in parallel, then amplification capability is improved, but loop oscillation and load fluctuations occur
Solution Approach 1:
A resistive section is introduced as an intermediary element connected between the multiple amplification paths. This resistor acts as a damping element that suppresses loop oscillation and stabilizes load fluctuations, allowing the parallel amplification structure to function reliably without the harmful oscillatory effects.
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 design effectively disperses power density, reducing the risk of resistor burning or discoloration and suppressing loop oscillation, load fluctuations, and ½ harmonic oscillation.
Implementation Method 1
a power density distribution of the stabilization resistor is not uniform and it is likely that a location at which electric power is excessively concentrated appears
Data Source
AI summary
According to an aspect of the first disclosure, an amplifier includes: an input terminal; an output terminal; a pair of amplification paths provided in parallel between the input terminal and the output terminal, each of the pair of amplification paths including a transistor; and a resistive section that connects the pair of amplification paths, wherein the resistive section includes: a resistor having a width which is, compared to on one end side, narrower on another end side; a pair of conductor patterns provided on both sides in a width direction of the resistor and electrically connected to the resistor; and a pair of wirings that connects the one end side of the pair of conductor patterns and the pair of amplification paths.