Balanced Amplifier Impedance Switching for Deep Back-Off Efficiency
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Solution Overview
Problem
Balanced amplifiers operating in power back-off conditions suffer from reduced efficiency and thermal challenges due to increased power dissipation, which is not effectively addressed by existing technologies.
Innovation Solution
An amplifier arrangement that operates in a balanced mode for high power and a single-ended mode for reduced power, utilizing impedance switching and deactivation of one amplifier to reduce DC power dissipation, thereby enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If balanced amplifiers operate in power back-off conditions to meet linearity demands, then linearity performance is improved, but efficiency deteriorates due to increased power dissipation
Solution Approach 1:
The patent implements dynamic operation mode switching between balanced mode and single-ended mode based on output power requirements. The balanced amplifier system dynamically adjusts its configuration: operating in balanced mode when high linearity is needed, and switching to single-ended mode when lower power consumption is prioritized, thereby resolving the contradiction between linearity performance and power efficiency
Solution Approach 2:
The patent changes the operational parameters of the amplifier system by adjusting impedance values and switching between different operational states. By modifying the impedance presented to the amplifier and switching between balanced and single-ended configurations, the system optimizes the trade-off between linearity and power dissipation according to operating conditions
2Measurement precision
If balanced amplifiers operate in power back-off conditions, then linearity is improved, but thermal challenges increase due to heat generation
Solution Approach 1:
The system dynamically switches between balanced and single-ended operational modes to manage thermal load. When operating conditions allow, it transitions to single-ended mode which generates less heat, thereby maintaining linearity performance while reducing thermal challenges associated with continuous balanced mode operation in power back-off conditions
3Loss of energy
If impedance switching and amplifier deactivation are used to reduce DC power dissipation, then efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the amplifier system into two independent amplifiers that can be selectively activated or deactivated. This segmentation allows the system to reduce DC power dissipation by turning off one amplifier when operating in single-ended mode, while the added complexity of switching and control mechanisms is offset by the significant power savings achieved through this modular approach
Data Source
AI summary
Methods and apparatuses for providing a reduction in output power of a balanced amplifier configuration are presented. According to one aspect, reduction of the output power is provided by deactivating one of the two amplification paths of the balanced amplifier. According to another aspect, impedances seen at ports of input and output couplers of the balanced amplifier configuration part of a deactivated amplification path are selectively switched in dependence of operation according to the reduced output power or according to normal output power. In addition, or in the alternative, impedance seen at an isolated/terminated port of the input and/or the output coupler is selectively switched in dependence of the operation. When operating according to the reduced output power, values of the switched impedances can be adjusted to tune a frequency response of the balanced amplifier.