Power Amplifier Bias Feedback for Even-Order Harmonic Reduction
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Solution Overview
Problem
Power amplifiers used in wireless communication face challenges in preventing the occurrence of even-order harmonic components in their output signals, which are not effectively addressed by existing technologies.
Innovation Solution
The power amplifier incorporates a feedback circuit that adjusts the bias signals to match the average DC voltage of the output signal with a reference voltage, ensuring the waveform is point symmetrical, thereby reducing even-order harmonics through a configuration including a signal generator, inverters, a feedback circuit, and a bias supply circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a power amplifier uses an inverter for wireless communication, then the output signal can be generated, but even-order harmonic components occur in the output signal
Solution Approach 1:
The patent employs a feedback circuit that detects the output signal from the inverter and feeds it back to adjust the bias signal. This feedback mechanism dynamically adjusts the operating point of the inverter to minimize even-order harmonic components while maintaining the desired output signal power and quality.
Solution Approach 2:
The patent changes the bias signal parameters (voltage or current level) based on the detected output signal characteristics. By dynamically adjusting the bias parameter, the system optimizes the inverter's operating point to reduce even-order harmonics while preserving the fundamental output signal.
2Stability of the object's composition
If the bias signal is adjusted to reduce even-order harmonics, then waveform symmetry improves, but additional circuit complexity is introduced
Solution Approach 1:
The feedback circuit provides automatic adjustment of the bias signal based on output signal detection, eliminating the need for manual tuning or complex external control systems. The feedback loop self-regulates to maintain waveform symmetry and minimize harmonics.
Solution Approach 2:
The system uses its own output signal as the feedback source, allowing the power amplifier to self-adjust and optimize its performance without requiring external intervention or additional complex control mechanisms.
Data Source
AI summary
A power amplifier includes an output signal generator constructed to generate, on the basis of an input AC signal, an output signal including, in cycles, a first pulse being width higher in voltage than a first reference voltage and a second pulse being width lower in voltage than the first reference voltage and a feedback circuit constructed to generate a first bias signal corresponding to the output signal and feed back the first bias signal to an input side of the output signal generator to equalize a width of the first pulse and a width of the second pulse in the cycles of the output signal.