Power Amplifier Harmonic Sinking for Better Linearity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power amplifiers in wireless devices face challenges in achieving band-broadening, improved linearity, and intellectualization, particularly in efficiently amplifying signals while minimizing harmonic components.
Innovation Solution
A power amplifier configuration that includes a first amplifier, a phase shifter, and a harmonic sinker, where the harmonic sinker is connected between the output terminals of the phase shifter and the first amplifier, operating with a narrower conduction angle than the first amplifier, to invert and amplify signals, effectively eliminating desired harmonic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional power amplifier is used to amplify signals, then signal amplification is achieved, but harmonic components are generated that degrade linearity
Solution Approach 1:
The patent converts the harmful harmonic components generated by the first amplifier into a useful element by feeding them back through the phase shifter to the harmonic sinker. The harmonic sinker specifically targets and cancels these harmonic components, transforming the amplifier's inherent nonlinearity from a defect into an opportunity for selective harmonic elimination, thereby improving overall linearity.
Solution Approach 2:
The patent implements a feedback mechanism where the output of the first amplifier is fed back through a phase shifter and harmonic sinker to cancel harmonic components. This feedback loop continuously monitors and corrects harmonic distortion, allowing the system to maintain high linearity by dynamically compensating for nonlinear effects in real-time.
2Reliability
If the conduction angle of the harmonic sinker is widened to improve harmonic cancellation, then harmonic elimination improves, but the size and complexity of the harmonic sinker increases
Solution Approach 1:
The patent optimizes the conduction angle of the harmonic sinker as a critical parameter to achieve the right balance between harmonic cancellation effectiveness and device size. By carefully selecting and tuning the conduction angle parameter, the system achieves sufficient harmonic elimination without requiring an oversized or overly complex harmonic sinker circuit.
Data Source
AI summary
There is provided a power amplifier and an integrated circuit including the power amplifier. The power amplifier includes a first amplifier configured to amplify a first signal; a phase shifter configured to invert the first signal; and a harmonic sinker connected between an output terminal of the phase shifter and an output terminal of the first amplifier, configured to amplify an output signal of the phase shifter, and configured to have a conduction angle narrower than a conduction angle of the first amplifier.