MOSFET Power Amplifier With Integrated 50Ω Impedance Matching
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Solution Overview
Problem
Conventional RF power amplifiers require impedance matching circuits, which consume additional power and occupy valuable space, especially in low-power applications, making them inefficient for managing power consumption and performance.
Innovation Solution
A novel RF power amplifier design that eliminates the need for impedance matching circuits by using a nanoscale power cell with inductors coupled to the source and gate of a MOSFET, achieving 50Ω input and output impedances without external matching circuits, allowing for maximum power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If impedance matching circuits are used in conventional RF power amplifiers, then power transfer efficiency is improved, but power consumption increases and device area increases
Solution Approach 1:
The patent extracts and eliminates the impedance matching circuits from the RF power amplifier system. By using a nanoscale power cell with inherently matched 50Ω input and output impedances, the external matching circuits are removed entirely, reducing power consumption while maintaining power transfer efficiency.
Solution Approach 2:
The nanoscale power cell is designed to perform multiple functions simultaneously: it provides power amplification while also providing inherent impedance matching. The inductors coupled to the source and gate serve both as impedance matching elements and as part of the power amplification circuitry, eliminating the need for separate matching circuits.
2Productivity
If impedance matching circuits are used in conventional RF power amplifiers, then power transfer efficiency is improved, but device area increases
Solution Approach 1:
The patent removes the external impedance matching circuits from the system. The nanoscale power cell with its inherently matched 50Ω impedances eliminates the need for separate matching circuit components, thereby reducing the overall device area while maintaining power transfer efficiency.
Solution Approach 2:
The impedance matching function is merged into the power cell itself. The inductors are integrated directly into the power cell circuitry, combining the power amplification and impedance matching functions into a single compact unit, thus reducing total device area.
3Use of energy by moving object
If nanoscale power cell with inductors is used, then power consumption is reduced and device area is reduced, but maintaining 50Ω impedance matching becomes more challenging
Solution Approach 1:
The patent changes the operating parameters and physical dimensions to the nanoscale regime. By using nanoscale transistors and appropriately sized inductors, the inherent impedance of the power cell is transformed to match 50Ω standards, simplifying the overall impedance matching while reducing power consumption and device area.
Solution Approach 2:
The nanoscale power cell is designed to self-match to 50Ω impedances through its inherent characteristics. The specific configuration of inductors coupled to the source and gate creates natural impedance transformation, allowing the device to maintain proper impedance matching without external circuits or complex adjustment mechanisms.
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 reduces power consumption, eliminates the need for matching circuits, and maintains efficient power transfer, achieving a power output of -8 dBm while consuming as low as 213 μW of static power, outperforming conventional power cells in terms of power-added efficiency and static power consumption.
Implementation Method 1
a first inductor coupled to a gate of the transistor; and a second inductor coupled to a source of the transistor, wherein the first inductor and the second inductor each includes a first conductive coil and a second conductive coil, respectively, having first and second inductance values, respectively
Data Source
AI summary
A power amplifier (PA) cell is coupled to an input signal source an a load, and includes a transistor coupled to the load; a first inductor coupled to a gate of the transistor; and a second inductor coupled to a source of the transistor, wherein the first inductor and the second inductor each includes a first conductive coil and a second conductive coil, respectively, having first and second inductance values, respectively, such that the power cell is coupled to the input signal source without an input impedance matching circuit disposed between the gate of the transistor and the input signal source, and without an output impedance matching circuit disposed between a drain of the transistor and the load.