Dual-Mode Power Amplifier Load-Line Switching for Variable Output Power
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Solution Overview
Problem
Conventional single power amplifiers face challenges in achieving high power conversion efficiency under varying output powers, requiring multiple amplifiers with different load lines, which increases manufacturing costs and complexity.
Innovation Solution
A dual-mode power amplifier with switchable working power, utilizing a multi-tap input and output transformer, intermediate switches, and change-over switches integrated on a single chip, allowing for switching between preload and output load lines to optimize performance across different maximum output powers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple power amplifiers with different load lines are integrated to achieve high power conversion efficiency under different output powers, then power conversion efficiency is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple power amplifier functions into a single device by integrating a first power amplifier and a second power amplifier with different load lines into one unified structure. The switching mechanism allows this single device to perform the functions of multiple amplifiers, thereby improving power conversion efficiency across different output power ranges while reducing device complexity and manufacturing cost.
Solution Approach 2:
The patent implements dynamic switching between different power amplifier modes using a switching mechanism controlled by a control signal. This allows the system to dynamically select the appropriate power amplifier (first or second) based on the required output power, enabling high power conversion efficiency under varying operating conditions without requiring multiple permanently integrated amplifiers.
2Loss of energy
If multiple power amplifiers with different load lines are integrated to achieve high power conversion efficiency under different output powers, then power conversion efficiency is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple power amplifier functions into a single manufacturable device, reducing the total number of components that need to be produced and assembled. This merging approach lowers manufacturing cost while maintaining the ability to achieve high power conversion efficiency through the integrated switching mechanism between different amplifier modes.
Solution Approach 2:
The single power amplifier device is designed with multi-functionality, capable of operating in different modes (first power amplifier mode and second power amplifier mode) with different load lines. This universal design allows one device to replace multiple specialized amplifiers, thereby reducing manufacturing cost while maintaining high efficiency across various operating conditions.
3Power
If a single power amplifier operates at lower output power, then output power is reduced, but power conversion efficiency decreases
Solution Approach 1:
The patent uses dynamic switching between two power amplifier modes to maintain high power conversion efficiency across different output power levels. When output power requirements are low, the system switches to the appropriate amplifier mode optimized for that power range, preventing the efficiency degradation that would occur in a single fixed-mode amplifier operating below its optimal power level.
Solution Approach 2:
The patent changes the operating parameters (load line characteristics) of the power amplifier based on the required output power level. By switching between different load line configurations (first load line for high power, second load line for low power), the system maintains optimal power conversion efficiency across the full range of output power operations.
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 dual-mode power amplifier achieves optimal performance by controlling the intermediate and change-over switches to adjust the load line, enabling high power conversion efficiency without the need for multiple amplifiers, reducing costs and complexity.
Implementation Method 1
an input transformer, comprising a plurality of output taps, and an input coil is loaded with a to-be-amplified signal
Implementation Method 2
an output transformer, comprising a plurality of input taps, the number of the input taps is matched with that of the output taps of the input transformer, and an output coil amplified signals
Implementation Method 3
a first matching capacitor and a second matching capacitor, the first matching capacitor and the second matching capacitor are connected in parallel between taps at both ends of the input coil of the output transformer and ground
Data Source
AI summary
The invention discloses a dual-mode power amplifier with switchable working power and a mode switch method. The power amplifier adopts a multi-tap input transformer, and realizes the switching between preload line and output load line by controlling the on/off of the intermediate switch connected with taps, so as to achieve the best power conversion efficiency under different maximum output powers. By using the change-over switch to control the capacitance value of the matching capacitor, it is easier to adjust the load line, thus further ensuring the performance of the power amplifier provided by the invention. The intermediate switch and change-over switch are integrated on an independent chip by CMOS/phemt/bihemt/SeGe/SOI,etc, or on a power amplifier chip by CMOS/phemt/bihemt/SeGe/SOI, etc, which is easy to realize.