RF Transistor With Integrated Passives for Impedance Matching
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Solution Overview
Problem
Traditional RF power transistors require external integrated passive devices for impedance matching and harmonic termination, increasing the overall footprint and complexity of amplifier systems due to the need for discrete components and wirebond arrays.
Innovation Solution
Incorporating inductive and capacitive passive components directly into the transistor substrate between the source and drain regions, forming part of the impedance matching networks and harmonic termination circuits, thereby reducing the system footprint and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external integrated passive devices are used for impedance matching and harmonic termination, then the transistor can achieve desired performance, but the overall footprint of the amplifier system increases
Solution Approach 1:
The patent merges the active transistor component with passive components (inductors and capacitors) into a single integrated structure. The passive components are formed directly on the transistor substrate using the same fabrication processes, eliminating the need for separate external passive devices and reducing the overall system footprint while maintaining the required impedance matching and harmonic termination functions.
Solution Approach 2:
The transistor substrate serves multiple functions: it acts as both the active device substrate and the platform for forming passive components. The same substrate and fabrication processes are used to create both the transistor and the passive elements, making the substrate universal for both active and passive device functions.
2Adaptability or versatility
If external integrated passive devices are used, then the transistor system can be configured for impedance matching, but the manufacturing complexity increases due to additional wirebond arrays
Solution Approach 1:
The patent combines the transistor and passive components into a single integrated device that requires fewer interconnections. By forming inductors and capacitors directly on the transistor substrate, the need for extensive wirebond arrays to connect external passive devices is eliminated, significantly reducing manufacturing complexity while maintaining impedance matching capabilities.
Solution Approach 2:
The patent extracts the passive components from external discrete devices and relocates them directly onto the transistor substrate. This extraction of passive functions from external components and their integration onto the substrate eliminates the need for complex wirebond interconnections between separate devices.
3Adaptability or versatility
If external integrated passive devices are used, then the matching networks can be implemented, but the number of wirebonds required increases
Solution Approach 1:
The patent merges the matching network components directly onto the transistor substrate, integrating inductors and capacitors in close proximity to the transistor terminals. This integration dramatically reduces the number of wirebonds required compared to using external passive devices, as the matching elements are now part of the same physical device structure.
Data Source
AI summary
A device includes a semiconductor substrate, a source metallization over an active area of the semiconductor substrate, a through-substrate via electrically connected to the source metallization, and an input bond pad formed in the semiconductor substrate and spaced apart from the active area. The input bond pad is electrically connected to a set of gate structures. The device includes a first inductive coil over the semiconductor substrate between a first portion of the source metallization and a second portion of the source metallization and a first capacitor over the semiconductor substrate between the first portion of the source metallization and the second portion of the source metallization. The first inductive coil and the first capacitor are connected in series between the input bond pad and the through-substrate via.