Integrated Harmonic Termination Circuit for Semiconductor Power Amplifiers
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Solution Overview
Problem
The characteristics of power amplifier modules are deteriorated by harmonic termination circuits, particularly due to variations in bond wire shape during wire-bonding and output loss in flip-chip mounting, and require electrostatic discharge protection without compromising output levels.
Innovation Solution
A semiconductor device with a harmonic termination circuit integrated into the semiconductor substrate, where one end is connected to the output end of the transistor and the other end is connected to the ground end, reducing variations and eliminating the need for external electrodes and ESD protection elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a harmonic termination circuit is grounded at a module substrate, then harmonic attenuation is achieved, but characteristics are deteriorated due to variations in bond wire shape and output loss
Solution Approach 1:
The harmonic termination circuit is merged with the semiconductor substrate by forming the circuit directly on the substrate. This integration eliminates the need for separate module substrate mounting and bond wires, thereby eliminating variations in bond wire shape that cause characteristics deterioration.
Solution Approach 2:
The harmonic termination circuit is extracted from the module substrate and relocated to the semiconductor substrate. This extraction removes the circuit from the problematic mounting environment, eliminating the source of characteristics deterioration caused by bond wire variations and output loss at bumps.
2Reliability
If an outer electrode is provided at the harmonic termination circuit, then ESD protection is enabled, but output level is compromised due to difficulty in adding ESD protection elements
Solution Approach 1:
The ESD protection function is merged into the semiconductor substrate by forming the ESD protection circuit within the substrate. This integration allows ESD protection to be implemented without adding external elements that would compromise output levels, as the protection is achieved through internal circuit design rather than external components.
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 enhances linearity and power-added efficiency while reducing output loss and eliminating the need for external ESD protection, maintaining performance across a wide range of output levels.
Implementation Method 1
a transistor that amplifies an input signal supplied to an input end and outputs an amplified signal through an output end
Implementation Method 2
a first harmonic termination circuit to attenuate a harmonic component included in the amplified signal
Data Source
AI summary
A semiconductor device includes a semiconductor substrate, a transistor, and a first harmonic termination circuit. The transistor is formed at the semiconductor substrate. The transistor amplifies an input signal supplied to an input end and outputs an amplified signal through an output end. The first harmonic termination circuit attenuates a harmonic component included in the amplified signal. The first harmonic termination circuit is formed at the semiconductor substrate such that one end of the first harmonic termination circuit is connected to the output end of the transistor and the other end of the first harmonic termination circuit is connected to a ground end of the transistor.