Dual Class-E Amplifier Circuit for Wideband Harmonic Cancellation
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Solution Overview
Problem
Existing power amplifiers face challenges in accurately canceling second-order harmonic waves over a wide frequency range, limiting high power efficiency, particularly in class-F operation.
Innovation Solution
An amplifier circuit design incorporating a first power amplifier of inverse class-E type and a second power amplifier of class-E type, with phase-shifted fundamental waves and harmonic waves, utilizing combiner circuits to achieve precise cancellation of second-order harmonic waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If class-F operation is used to cancel second-order harmonic waves, then power efficiency of fundamental waves is improved, but the frequency range for accurate cancellation is narrow
Solution Approach 1:
The invention divides the single amplifier into two separate amplifiers (first and second power amplifiers), each handling different harmonic wave components. The first amplifier processes signals with even-order harmonic waves while the second amplifier processes signals with odd-order harmonic waves, allowing independent optimization for wideband operation.
Solution Approach 2:
The invention introduces variable impedance matching circuits that dynamically adjust the impedance characteristics across different frequency bands. This enables the system to maintain accurate harmonic wave cancellation across a wide frequency range by adapting the impedance transformation ratios according to the operating frequency.
2Loss of energy
If class-F operation is used, then power efficiency is improved, but accurate cancellation of second-order harmonic waves over the entire band is difficult
Solution Approach 1:
The invention employs feedback mechanisms where the output signals from both amplifiers are combined through a combiner circuit, and the impedance matching circuits continuously adjust based on the combined signal characteristics to maintain optimal harmonic wave cancellation across the entire operating band.
Solution Approach 2:
The invention changes the operating parameters by using inverse class-E operation for the first amplifier and class-E operation for the second amplifier, rather than traditional class-F operation. This parameter change enables broader frequency range operation while maintaining high power efficiency and accurate harmonic wave cancellation.
3Object-generated harmful factors
If inverse class-E and class-E types are used with phase-shifted fundamental waves, then harmonic wave suppression is improved, but device complexity increases
Solution Approach 1:
The invention merges the two amplifiers through a combiner circuit that combines their output signals. The combiner integrates the signals from both amplifiers while maintaining the phase relationships necessary for harmonic wave cancellation, achieving effective suppression without requiring completely separate output stages.
Solution Approach 2:
The invention designs the impedance matching circuits to serve multiple functions simultaneously: they perform impedance transformation for power matching, provide phase shifting for harmonic wave cancellation, and enable wideband operation. This multi-functionality reduces the need for additional separate components.
Data Source
AI summary
An amplifier circuit 1 includes a power amplifier circuit that includes a power amplifier, a power amplifier circuit that includes a power amplifier in which the phase of a fundamental wave at an output end is delayed by 90 degrees with respect to the power amplifier, and an in-phase combiner circuit that is configured to combine a fundamental wave of a first output signal output from the power amplifier circuit and a fundamental wave of a second output signal output from the power amplifier circuit. The power amplifier circuit is of an inverse class-E type. The power amplifier circuit is of a class-E type.