Configurable RF Power Amplifier Bias Switching for Back-Off Efficiency
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Solution Overview
Problem
Existing RF power amplifiers (PAs) operate efficiently at a single output power level, leading to degraded efficiency when the output power level is backed off, which adversely affects battery life.
Innovation Solution
A configurable RF PA circuitry that uses multiple RF PAs with different voltage biasing sources and power control inputs, allowing efficient operation across a wide range of output power levels by intelligently selecting configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single output power level is targeted for high efficiency operation, then efficiency at that specific power level is improved, but efficiency at other power levels deteriorates
Solution Approach 1:
The RF PA circuitry is designed with reconfigurable elements including multiple voltage sources (first voltage source and second voltage source) and switching circuitry that allows dynamic switching between different operating configurations. The logic circuitry receives control signals indicating desired output power levels and automatically switches between configurations to maintain high efficiency across varying power requirements, transforming a static single-point optimization into a dynamic multi-point optimization system.
Solution Approach 2:
The invention changes the operating parameters of the RF PA by providing multiple voltage sources with different voltage levels. The logic circuitry selects appropriate voltage levels and configuration parameters based on the desired output power level, thereby adapting the PA's operating characteristics to match the required power output and maintain optimal efficiency across different power levels.
2Power
If the output power level is backed off from the target level, then power consumption is reduced, but efficiency degrades
Solution Approach 1:
The system dynamically adapts to different output power levels by switching between configurations. When the output power level is backed off, the logic circuitry detects the change and switches to a configuration optimized for lower power operation, preventing efficiency degradation that would occur in a fixed-configuration PA.
Solution Approach 2:
The RF PA circuitry is designed to perform multiple functions efficiently by incorporating different voltage sources and configuration modes. It can operate efficiently at both high power levels (using the second voltage source) and low power levels (using the first voltage source), making it universally efficient across the entire power range rather than optimized for a single point.
Data Source
AI summary
An apparatus comprises a configurable radio frequency (RF) power amplifier (PA) circuitry including a first RF PA, a second RF PA, enable switches, a voltage source switch, and a logic circuitry. The first RF PA includes a first amplifier input coupled to an RF signal input. The second RF PA includes a second amplifier input coupled to the RF signal input. The second RF PA is in parallel with the first RF PA. The enable switches are for switchably enabling one of the first RF PA or the second RF PA. The voltage source switch is for switchably coupling one of a first voltage source or a second voltage source to a voltage bias input of an enabled one the first RF PA or the second RF PA. The first voltage source has a first voltage and the second voltage source has a second voltage greater than the first voltage.