Reconfigurable DC-Coupled Power Amplifier for Low-Power Efficiency
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Solution Overview
Problem
Power amplifiers in cellular handsets operate inefficiently at reduced output power levels, leading to increased thermal dissipation and reduced talk time due to reduced DC to RF conversion efficiency.
Innovation Solution
A power amplifier with reconfigurable DC coupling, utilizing a switch module and DC linear voltage regulator to adjust the DC power supply configuration between parallel and series modes based on output power levels, maintaining efficient supply drive efficiency across varying power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power amplifier operates at reduced output power levels, then output power is reduced, but DC to RF conversion efficiency is significantly reduced
Solution Approach 1:
The patent applies dynamics by making the DC coupling configuration reconfigurable between parallel and series modes based on the desired output power level. The switch module dynamically changes the circuit topology to match operating conditions, allowing the power amplifier to maintain high efficiency across both high and low power levels by adapting its DC supply configuration rather than being fixed in one mode.
2Power
If power amplifier operates at reduced output power levels, then output power is reduced, but thermal dissipation increases
Solution Approach 1:
The dynamic reconfiguration of DC coupling reduces thermal dissipation at low power levels by switching to series configuration, which improves DC to RF conversion efficiency. By adapting the circuit topology to the operating power level, the system minimizes wasted energy that would otherwise be dissipated as heat, thereby reducing thermal issues in the handset.
3Power
If power amplifier operates at reduced output power levels, then output power is reduced, but talk time is reduced
Solution Approach 1:
The reconfigurable DC coupling extends talk time by improving power efficiency at low output power levels through dynamic topology switching. By maintaining high DC to RF conversion efficiency regardless of power level, the system reduces overall power consumption from the battery, thereby extending the duration of operation and talk time during typical mobile phone usage where the amplifier operates below maximum power most of the time.
Data Source
AI summary
Embodiments of circuits, systems, and methods relating to a power amplifier with a reconfigurable direct current coupling are disclosed. Other embodiments may be described and claimed.