Digital Signal Compensation for GaN PA Trapping Effects
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Solution Overview
Problem
GaN power amplifiers suffer from the trapping effect due to impurities and defects, leading to performance issues such as current collapse, shift in threshold voltage, and power efficiency degradation, which existing solutions like GaN boosters and additional circuits fail to adequately address without compromising power efficiency or requiring extensive time and resources.
Innovation Solution
A digital signal compensation method that generates a compensation signal by smoothing and aligning digital input signals, using a lookup table to correct for trapping effects, without the need for additional hardware or power efficiency loss, by adaptively updating the compensation values based on input and output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a GaN booster solution is used to solve trapping effect, then the trapping effect is suppressed, but power efficiency is significantly degraded
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values in a lookup table before actual signal processing. The digital compensation signal is generated by table lookup based on the instantaneous power of the input signal, allowing real-time compensation without additional hardware or power efficiency loss.
2Reliability
If additional circuits such as Diode based Phase Modulator are used for pre-correction, then gain and phase offset are corrected, but device complexity and cost increase
Solution Approach 1:
The patent replaces physical correction circuits (mechanical/electrical systems) with digital signal processing. Instead of using additional analog circuits like diode-based phase modulators, the invention uses digital lookup tables and signal combining to achieve the same correction function, thereby reducing device complexity and cost.
3Reliability
If conventional correction methods are used, then some performance issues are addressed, but they fail for dynamic waveforms with small and large signals
Solution Approach 1:
The patent applies dynamics by making the compensation signal adaptive to the instantaneous power of the input signal. The lookup table is indexed by the instantaneous power, allowing the compensation to dynamically adjust according to the signal level, thereby handling both small and large signals in dynamic waveforms effectively.
Data Source
AI summary
The present disclosure provides a method and device for digital signal compensation. The method for signal compensation includes: generating a digital compensation signal at least partially based on smoothing, in real time, a digital input signal or a signal that is derived from the digital input signal; delaying the digital input signal such that the delayed digital input signal is aligned with the digital compensation signal in the time domain; and generating a digital compensated signal by combining the delayed digital input signal with the digital compensation signal.