High-Frequency Amplifier Matching Circuit for Oscillation Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High frequency amplifiers face challenges in suppressing oscillations while reducing impedance in matching circuits, as narrow slits in input matching circuits lead to coupling and circulation loops that prevent high frequency current attenuation, and increasing slit width for oscillation suppression limits impedance reduction.
Innovation Solution
A high frequency amplifier configuration with a comb structure having multiple lines connected to amplification elements, where resistors are placed between adjacent lines, and varying spacings between lines, including a first and second spacing, to ensure high frequency current flows through resistors and attenuates, thereby suppressing oscillations and reducing impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the slit in the input matching circuit is increased to suppress oscillations, then oscillation suppression is improved, but the impedance of the input matching circuit increases
Solution Approach 1:
The patent applies local quality by creating different spacing distances between adjacent lines in the comb structure. Specifically, the spacing between certain adjacent lines is set to a first distance, while spacing between other adjacent lines is set to a second distance that is different from the first. This non-uniform spacing allows different regions of the matching circuit to have different impedance characteristics, enabling oscillation suppression in critical areas while maintaining lower overall impedance for power efficiency.
2Object-affected harmful factors
If the width of the slit is narrow, then the impedance of the input matching circuit is reduced, but coupling occurs over the slit and high frequency current flows through the coupling path
Solution Approach 1:
The patent uses local quality by implementing non-uniform spacing between lines in the comb structure. By setting different spacing distances (first distance and second distance) between adjacent lines, the circuit creates localized regions with different coupling characteristics. This allows the matching circuit to maintain narrow overall dimensions for low impedance while specific local regions have increased spacing to prevent coupling and block high frequency current circulation paths that cause oscillations.
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 effectively suppresses oscillations and reduces impedance in matching circuits by ensuring high frequency currents flow through resistors, preventing circulation loops and enhancing attenuation, thus improving the amplifier's performance.
Implementation Method 1
by placing a resistor in the slit, isolation between cells of the amplification element is improved, and oscillations are suppressed
Implementation Method 2
when a high frequency current in an opposite direction occurs between both the ends of the input matching circuit between which the slit is sandwiched, a coupling over the slit occurs and the high frequency current flows through this coupling
Data Source
AI summary
Disclosed is a high frequency amplifier including an input matching circuit, an output matching circuit, and m (m is an integer greater than or equal to three) amplification elements, in which at least one of the input and output matching circuits includes: a comb structure having m lines whose one ends are connected on a one to one basis to the m amplification elements, and a joint part where the other ends of the m lines are joined together; and resistors each provided between adjacent lines out of the m lines, and in which multiple spacings each formed between adjacent lines of the m lines include a first spacing and a second spacing wider than the first spacing.