High-Frequency Amplifier Matching Layout for Phase Consistency

Solution Overview

Problem

Existing high frequency amplifiers experience variations in phase and effective impedance due to mutual inductance components between wires connected to multiple transistors, leading to inefficiencies in RF signal amplification.

Innovation Solution

A high frequency amplifier design with asymmetrical matching circuit patterns and transmission lines, where the second transmission line has a shorter electrical length and higher effective impedance than the first, reducing phase variations by canceling out electrical length differences between wires.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If symmetrical matching circuit patterns are used for multiple transistors, then manufacturing simplicity is maintained, but phase variations occur due to differences in wire effective impedance

Engineering Contradiction:

Improvephase consistencyVSAvoidmatching circuit asymmetry

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies asymmetry by designing matching circuit patterns with different electrical lengths for different transistors. Specifically, the first matching circuit pattern has a first electrical length and the second matching circuit pattern has a second electrical length that is different from the first, creating intentional asymmetry to compensate for the symmetrical wire layout and achieve phase consistency across all transistor outputs.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent implements local quality by customizing the electrical length of each matching circuit pattern according to the specific position and wire characteristics of its associated transistor. Each matching circuit is locally optimized with a specific electrical length value to compensate for the effective impedance differences of its corresponding wire, rather than using a uniform design for all transistors.

Inventive Principle:

Principle #3Local quality

2Reliability

If wires of different lengths are used to connect transistors to matching circuits, then phase variations can be compensated, but manufacturing precision requirements increase

Engineering Contradiction:

Improvephase consistencyVSAvoidwire length control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies asymmetry by designing matching circuit patterns with different electrical lengths for different transistors. Specifically, the first matching circuit pattern has a first electrical length and the second matching circuit pattern has a second electrical length that is different from the first, creating intentional asymmetry to compensate for the symmetrical wire layout and achieve phase consistency across all transistor outputs.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent changes the electrical length parameter of the matching circuit patterns to compensate for wire effective impedance differences. By adjusting the electrical length of each matching circuit pattern to a specific value, the overall phase delay from transistor to output is equalized, compensating for the varying wire characteristics without requiring precise wire length control.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If electrical length differences between transmission lines are increased, then phase variations are reduced, but impedance matching complexity increases

Engineering Contradiction:

Improvephase consistencyVSAvoidimpedance matching

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the electrical length parameter of the matching circuit patterns to compensate for wire effective impedance differences. By adjusting the electrical length of each matching circuit pattern to a specific value, the overall phase delay from transistor to output is equalized, compensating for the varying wire characteristics without requiring precise wire length control.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses the inherent parasitic capacitance and inductance of the matching circuit patterns as disposable elements to achieve phase compensation. Rather than using additional active components or complex adjustable mechanisms, the design relies on the electrical length of the transmission line patterns themselves, which are already necessary for impedance matching, to provide the required phase correction.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS12519429B2High frequency amplifier

Publication Date: 2026.01.06 SUMITOMO ELECTRIC DEVICE INNOVATIONS

AI summary

A high frequency amplifier includes a first transistor and a second transistor, a first drain pad connected to the first transistor and a second drain pad connected to the second transistor, a matching circuit pattern having a first transmission line connected to the first drain pad and a second transmission line connected to the second drain pad, a first wire and a second wire, and a wiring pattern connected to the first drain pad via the first transmission line and the first wire and connected to the second drain pad via the second transmission line and the second wire. An effective impedance of the second wire is larger than an effective impedance of the first wire. The matching circuit pattern has an asymmetrical external shape. An electrical length of the second transmission line is shorter than an electrical length of the first transmission line.