Multi-Carrier Power Tracking for Efficient RF Power Amplifiers
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Solution Overview
Problem
Power amplifiers in wireless devices face inefficiencies when handling multiple transmit signals simultaneously, leading to wasted power and potential intermodulation distortion due to the need for separate power tracking for each signal, which increases circuit complexity and power consumption.
Innovation Solution
A power tracking system that generates a single power supply voltage based on the in-phase and quadrature components of multiple transmit signals, allowing a single power amplifier to efficiently amplify multiple signals sent simultaneously, reducing circuit components and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power tracking is implemented for each transmit signal, then each signal can be amplified with appropriate power supply voltage, but circuit complexity and power consumption increase
Solution Approach 1:
The patent combines multiple separate power tracking circuits into a single power tracking circuit that processes multiple transmit signals simultaneously. The power tracker receives I and Q components from multiple signals, computes a combined power tracking signal, and generates a single power supply voltage that tracks the envelope of the combined output RF signal, thereby reducing circuit complexity while maintaining amplification quality.
Solution Approach 2:
The single power tracking circuit is designed to handle multiple transmit signals with different frequencies and power levels universally. It computes the power tracking signal based on I and Q components of all input signals, making the circuit multi-functional and adaptable to various signal combinations without requiring separate dedicated circuits for each signal.
2Reliability
If separate power tracking is implemented for each transmit signal, then each signal receives dedicated power supply control, but power consumption increases
Solution Approach 1:
The patent merges multiple power supply control functions into a single power supply voltage generation process. By computing one combined power tracking signal from multiple I and Q components and generating a single power supply voltage, the system reduces the total power consumption associated with multiple separate power tracking circuits while maintaining accurate power supply control for the combined output signal.
3Device complexity
If a single power amplifier processes multiple transmit signals, then circuit complexity is reduced, but power-added efficiency decreases without proper power tracking
Solution Approach 1:
The patent implements dynamic power tracking by continuously computing the power tracking signal from I and Q components of multiple transmit signals and dynamically adjusting the power supply voltage to the power amplifier. This dynamic adjustment ensures the power amplifier operates at optimal efficiency levels across varying signal conditions, preventing energy loss while maintaining circuit simplicity.
Solution Approach 2:
The power tracking circuit employs feedback by monitoring the I and Q components of the input signals, computing the required power supply voltage based on the combined signal envelope, and adjusting the power supply voltage accordingly. This feedback mechanism ensures the power amplifier maintains high power-added efficiency when processing multiple simultaneous transmit signals.
Data Source
AI summary
Techniques for generating a power tracking supply voltage for a circuit (e.g., a power amplifier) are disclosed. The circuit may process multiple transmit signals being sent simultaneously on multiple carriers at different frequencies. In one exemplary design, an apparatus includes a power tracker and a power supply generator. The power tracker determines a power tracking signal based on inphase (I) and quadrature (Q) components of a plurality of transmit signals being sent simultaneously. The power supply generator generates a power supply voltage based on the power tracking signal. The apparatus may further include a power amplifier (PA) that amplifies a modulated radio frequency (RF) signal based on the power supply voltage and provides an output RF signal.