Envelope Tracking Circuit with PA Resistance Feedback Equalization
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Solution Overview
Problem
Envelope tracking power supply circuitry for radio frequency power amplifiers is often complex and fails to generate ideal envelope tracking power supply signals, leading to decreased performance and efficiency.
Innovation Solution
The implementation of an envelope tracking integrated circuit (ETIC) coupled with a power supply, a filter equalizer, and PA resistance estimator circuitry that includes peak detector circuits and comparator circuitry to inject error-correcting signals and update equalizer settings based on real-time resistance estimation, ensuring accurate envelope tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional envelope tracking power supply circuitry is used, then power supply function is provided, but circuit complexity increases and envelope tracking accuracy deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the measured PA resistance is fed back to adjust the envelope tracking signal. The system continuously monitors the actual PA resistance and modifies the envelope tracking power supply signal accordingly, creating a closed-loop control system that improves tracking accuracy while maintaining manageable circuit complexity through intelligent control rather than complex hardware.
Solution Approach 2:
The patent replaces complex hardware-based envelope tracking adjustment mechanisms with a measurement and estimation-based approach. Instead of using complex analog circuitry to pre-compensate for PA variations, the system uses measurement circuitry to detect actual PA resistance and dynamically adjusts the envelope tracking signal based on measured data, substituting mechanical/hardware complexity with intelligent measurement and control.
2Device complexity
If simple envelope tracking circuitry is used, then circuit complexity is reduced, but envelope tracking capability deteriorates
Solution Approach 1:
The patent enables the envelope tracking system to self-adjust by measuring its own operating conditions. The system includes measurement circuitry that monitors the actual PA resistance and automatically modifies the envelope tracking signal without external intervention. This self-service capability allows simple circuitry to achieve reliable envelope tracking by adapting to actual PA conditions in real-time.
Solution Approach 2:
The patent dynamically changes the parameters of the envelope tracking signal based on measured PA resistance. Instead of using fixed, complex circuitry to handle all possible PA variations, the system measures the actual resistance and adjusts the envelope tracking signal parameters accordingly. This parameter adaptation allows simple circuitry to maintain reliable tracking across varying PA conditions.
3Measurement precision
If real-time PA resistance measurement is implemented, then envelope tracking accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements measurement circuitry that serves multiple functions: it measures PA resistance for envelope tracking accuracy, characterizes PA behavior, and provides data for system optimization. By making the measurement system multi-functional, the patent reduces the need for separate dedicated circuits for each function, thereby improving envelope tracking accuracy without proportionally increasing overall device complexity.
Data Source
AI summary
Disclosed is envelope tracking circuitry having an envelope tracking integrated circuit (ETIC) coupled to a power supply to provide an envelope tracked power signal to a power amplifier (PA) with a filter equalizer configured to inject an error-correcting signal into the ETIC in response to equalizer settings. Further included is PA resistance estimator circuitry having a first peak detector circuit configured to capture within a window first peaks associated with a sense current generated by the ETIC, a second peak detector circuit configured to capture within the window second peaks associated with a scaled supply voltage corresponding to the envelope tracked power signal, comparator circuitry configured to receive the first peaks and receive the second peaks and generate an estimation of PA resistance, and an equalizer settings correction circuit configured to receive the estimation of PA resistance and update the equalizer settings in response to the estimation of PA resistance.