High-Frequency Circuit Oscillation Suppression via Segmented Matching
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Solution Overview
Problem
Conventional high-frequency circuits face difficulties in suppressing oscillations at both high and low frequencies due to inadequate placement and length of isolation resistors, which leads to ineffective signal transmission and oscillation control.
Innovation Solution
The high-frequency circuit design includes a plurality of transistors arranged in parallel on a semiconductor substrate, with input and output matching circuits divided into multiple circuits and connected by resistors that are strategically placed and lengthened to effectively suppress oscillations across a wide frequency band, utilizing low-frequency oscillation suppressing circuits and isolation resistors to attenuate signals at both high GHz-order and low MHz-order frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If matching circuits are divided into multiple circuits with isolation resistors to suppress high-frequency oscillation, then high-frequency oscillation is suppressed, but the circuit complexity increases
Solution Approach 1:
The matching circuits are divided into multiple segments, each equipped with isolation resistors at strategically determined positions. This segmentation provides effective high-frequency oscillation suppression by isolating adjacent transistor pairs while maintaining a manageable circuit structure through systematic placement rather than random distribution.
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 suppresses oscillations across a wide frequency range by strategically placing and lengthening resistors between input and output matching circuits, ensuring that both high-frequency and low-frequency oscillations are attenuated, thereby improving signal transmission and reducing oscillatory effects.
Implementation Method 1
each of an input matching circuit and an output matching circuit is divided into a plurality of circuits, and the divided matching circuits are connected to each other with resistors (isolation resistors). Oscillation at a high oscillation frequency occurs in a closed loop (electrically closed path for a high-frequency signal)
Implementation Method 2
The low-frequency oscillation suppressing circuit is configured by connecting an inductor L, a resistor R, and a capacitor C in series with each other
Implementation Method 3
The low-frequency oscillation suppressing circuit is configured by connecting an inductor L, a resistor R, and a capacitor C in series with each other
Implementation Method 4
The low-frequency oscillation suppressing circuit is configured by connecting an inductor L, a resistor R, and a capacitor C in series with each other
Data Source
AI summary
A high-frequency circuit according to one embodiment of the present invention includes a plurality of transistors, a plurality of input matching circuits, a plurality of output matching circuits, a plurality of resistors, and low-frequency oscillation suppressing circuits. The transistors are arranged on a substrate in parallel. The input matching circuits and output matching circuits are arranged on insulating substrates and connected to the transistors. The oscillation suppressing circuits are a circuit configured by a filter circuit having a desired transmission band and a resistor, and are connected to gate terminals of transistors located on both sides of the transistors, respectively. Each of resistors is formed to include a position closest to the transistor between the input matching circuits and between the output matching circuits. Furthermore, each of resistors has a length at which the oscillation suppressing circuit can suppress oscillation at the lowest frequency in the transmission band.