Pulse Amplifier Dummy Signal Timing for Low-Distortion GaN Output
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Solution Overview
Problem
High-power GaN semiconductor amplifiers experience significant waveform distortion and heat generation issues due to nonlinear operation, leading to reduced gain and efficiency, especially when handling high output powers and dummy signals are inserted between pulses.
Innovation Solution
The implementation of a pulse signal amplification device with a dummy signal generation and separation mechanism, where a dummy signal is added before and after the desired signal to maintain constant power within a predetermined time frame, allowing the amplifier to operate nonlinearly while minimizing distortion and heat generation by separating the dummy signal post-amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dummy signal is inserted into the entire interval between pulses to reduce waveform distortion, then the linearity of the output signal is improved, but the heat generation becomes quite significant
Solution Approach 1:
The patent applies partial action by inserting dummy signals only at specific critical moments (immediately before the leading pulse and immediately after the trailing pulse) rather than continuously throughout the entire pulse interval. This partial application of the dummy signal technique reduces waveform distortion at the problematic transition points while minimizing unnecessary heat generation during the middle portion of the pulse interval where distortion is less severe.
Solution Approach 2:
The patent implements local quality by concentrating dummy signal insertion at specific localized positions (leading edge before the pulse and trailing edge after the pulse) rather than uniformly across the entire pulse interval. This localized approach addresses the specific regions where waveform distortion occurs most severely while avoiding excessive heat generation in other regions of the pulse interval.
2Power
If a GaN amplifier operates in a nonlinear region to handle high output power, then the power handling capability is improved, but the gain decreases by no less than 3 dB compared to linear region
Solution Approach 1:
The patent applies preliminary action by inserting dummy signals before the actual pulse to pre-condition the GaN amplifier's thermal and electrical state. This preliminary dummy signal insertion allows the amplifier to transition more smoothly into the high-power nonlinear operation region, reducing the abrupt gain drop that normally occurs when suddenly switching to high power operation.
Solution Approach 2:
The patent implements feedback by using the dummy signal mechanism to continuously condition the amplifier state before actual signal amplification. The dummy signals provide a feedback-like effect by preparing the amplifier's operating point, ensuring that when the actual high-power signal arrives, the amplifier is already partially adapted to the nonlinear region, thereby reducing gain variation.
3Manufacturing precision
If a dummy signal is inserted immediately before a leading pulse to reduce amplitude and phase distortion, then the signal linearity is improved, but the heat generation increases
Solution Approach 1:
The patent applies partial action by inserting dummy signals only at specific critical moments (immediately before the leading pulse and immediately after the trailing pulse) rather than continuously throughout the entire pulse interval. This partial application of the dummy signal technique reduces waveform distortion at the problematic transition points while minimizing unnecessary heat generation during the middle portion of the pulse interval where distortion is less severe.
Data Source
AI summary
An amplification device includes a pulse signal acquisition part, a dummy signal generation part, a combination part, an amplifier and a separation part. The pulse signal acquisition part acquires a desired signal that is a pulse signal to be amplified. The dummy signal generation part generates a dummy signal. The combination part adds the dummy signal before and after the desired signal and outputs a composite signal. The amplifier amplifies the composite signal and outputs an amplified composite signal. The separation part extracts an amplified desired signal that is a signal resulting from amplification of the desired signal, from the amplified composite signal and outputs the amplified desired signal. Power of the composite signal is power that makes the amplification part operate nonlinearly.