RF Power Amplifier Circuit With Harmonic Suppression Topology
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Solution Overview
Problem
Existing power amplifier circuits struggle with suppressing higher harmonics, which degrades the transmission characteristics of the fundamental wave.
Innovation Solution
A radio frequency circuit design incorporating multiple amplifying devices and transformers, including LC series circuits and capacitive devices, to suppress harmonics without degrading fundamental wave transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If suppression means are added to suppress higher harmonics, then linearity of high-output radio frequency signals is improved, but transmission characteristics of the fundamental wave are degraded
Solution Approach 1:
The patent divides the amplifier system into multiple independent amplifying devices (first amplifier, second amplifier, third amplifier, fourth amplifier) that can be independently controlled. Each amplifier can be selectively activated or deactivated based on signal conditions, allowing harmonic suppression to be applied only when needed without continuously affecting fundamental wave transmission characteristics.
Solution Approach 2:
The patent implements dynamic control of amplifying devices and harmonic suppression means based on signal power levels and operational conditions. The system adaptively adjusts which amplifiers are active and when harmonic suppression is applied, ensuring that fundamental wave transmission is not degraded during normal operation while still achieving linearity improvement when high-output signals are present.
2Manufacturing precision
If harmonic suppression is applied in both operation and non-operation states of amplifiers, then linearity is improved, but fundamental wave transmission characteristics are degraded
Solution Approach 1:
The patent applies preliminary anti-action by selectively enabling harmonic suppression means only when amplifiers are in operation and high-output signals are detected. The system prevents the harmful effect of harmonic suppression on fundamental wave transmission by anticipating when suppression should be active (during high-power operation) and inactive (during low-power or non-operation states), thereby avoiding unnecessary degradation of transmission characteristics.
Solution Approach 2:
The system dynamically adjusts the state of harmonic suppression means based on real-time operational conditions. When amplifiers are in non-operation or low-power states, harmonic suppression is disabled to preserve fundamental wave transmission characteristics. When high-power operation is detected, harmonic suppression is activated to improve linearity, thus adapting the suppression level to match actual operational needs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively suppresses harmonics while maintaining the transmission characteristics of the fundamental wave, enhancing the performance of radio frequency signals.
Implementation Method 1
an LC series circuit
Implementation Method 2
a first capacitive device
Implementation Method 3
a first transformer having a first input-side coil and a first output-side coil
Data Source
AI summary
A radio frequency circuit includes carrier amplifiers and peak amplifiers, transformers, a signal output terminal connected to a first end of an output-side coil, an LC series circuit, and a capacitor. An input-side coil is connected, at its first end, to the carrier amplifier, and is connected, at its second end, to the carrier amplifier. An input-side coil is connected, at its first end, to the peak amplifier, and is connected, at its second end, to the peak amplifier. The LC series circuit is connected between the peak amplifier and the ground. The capacitor is connected to a second end of the output-side coil and a first end of an output-side coil. The output-side coil is connected, at its second end, to the ground.