Impedance-Transforming Amplifier Output for Lower Switching Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power amplifiers for mobile communication devices face challenges in reducing power consumption and occupying less space while efficiently amplifying signals with both constant and variable envelopes, leading to high power loss and increased chip area due to switching elements for high output power.
Innovation Solution
An amplifier arrangement with an impedance transformer circuit and switchable reactance elements that adjust output impedance to reduce power consumption and improve efficiency, allowing for adjustable amplification with low power consumption and reduced high-frequency power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switching elements are used to connect or disconnect capacitive elements for changing load impedance, then the amplifier can be used for multiple mobile communication standards with adjustable output power, but power is lost via the switching elements particularly at high output power and the switches require relatively large chip area
Solution Approach 1:
An impedance transformer circuit is introduced as an intermediary component between the amplifier and the capacitive elements. This transformer circuit enables impedance matching and power transfer while allowing the switching elements to operate at lower power levels, thereby reducing the power loss associated with switching operations particularly at high output power conditions
Solution Approach 2:
The patent employs variable impedance transformation ratios in the impedance transformer circuit to adapt to different communication standards and power levels. By dynamically changing the impedance parameters, the system achieves versatile compatibility while optimizing power efficiency across different operating conditions
2Power
If switching elements are designed for high output power, then the amplifier can deliver high power, but the switches require relatively large chip area resulting in increased overall space
Solution Approach 1:
The power amplification function is segmented into multiple stages: a main amplifier stage that handles the bulk of power amplification, and a final stage with switching elements that operates at reduced power levels. This segmentation allows the switching elements to be smaller while still achieving high overall output power through the cascaded stages
Solution Approach 2:
The impedance transformer circuit acts as an intermediary that enables high power transfer from the amplifier to the load while allowing the switching elements to operate at lower power levels. This mediator function reduces the size requirement for switching elements while maintaining high output power capability
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
The solution achieves improved amplification efficiency and reduced power consumption, extending the operating duration of mobile communication devices by optimizing the impedance transformation and reactance switching in the amplifier arrangement.
Implementation Method 1
The impedance transformer circuit is designed for transforming a high output impedance of the adjustable amplifier into a low impedance at the output of the impedance transformer circuit
Implementation Method 2
at least two switchable elements having a reactance. Said elements are connected by a first terminal in each case to the output of the impedance transformer circuit and are connected by a second terminal to a reference potential terminal
Data Source
AI summary
An amplifier arrangement is proposed which has an amplifier with adjustable amplification having an output. An impedance transformer circuit is connected to the output. Said circuit is designed for transforming a high output impedance of the adjustable amplifier into a low impedance at its output. The amplifier arrangement contains at least two switchable elements having a reactance, which elements are connected in each case by a first terminal to the output of the impedance transformer circuit, and by a second terminal to a reference potential terminal. The switchable elements are designed for changing the impedance at the output of the impedance transformer circuit depending on a switch position of a switching means. A load impedance at the output of the amplifier is consequently varied by simple means when the output level of the amplifier changes.