RF Power Amplifier Bias Linearization for Linearity and Efficiency
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Solution Overview
Problem
Current radio frequency power amplifier modules face challenges in maintaining high linearity and power-added efficiency, leading to reduced service time and transmission speed in wireless communication equipment, as conventional methods to improve linearity often compromise power-added efficiency and result in heating issues.
Innovation Solution
A radio frequency power amplifier module comprising a bias circuit, a linearization circuit, and a power amplifier circuit, where the linearization circuit regulates the energy of the radio frequency signal fed back to the bias circuit to control the intensity of the bias current, thereby inhibiting nonlinear energy and enhancing linearity and power-added efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quiescent operating current is increased to improve linearity of low power section, then linearity is improved, but power-added efficiency is reduced causing heating
Solution Approach 1:
The patent applies dynamic bias current adjustment by introducing a linearization circuit that dynamically regulates the bias current based on the operating power section. The circuit includes a first diode, second diode, first capacitor, passing element, and ballast resistor that work together to automatically adjust bias current intensity, enabling the system to operate efficiently across low, middle, and high power sections without manual intervention.
Solution Approach 2:
The patent changes the bias current parameter dynamically by using diodes and capacitors to regulate current intensity. The first diode and second diode in series with the passing element create different conduction states that adjust the bias current parameter according to the power amplifier's operating section, thereby optimizing both linearity and power-added efficiency for each operating range.
2Reliability
If dynamic operating current is increased to improve linearity of high power section, then linearity is improved, but power-added efficiency is reduced causing heating
Solution Approach 1:
The patent applies dynamic bias current adjustment by introducing a linearization circuit that dynamically regulates the bias current based on the operating power section. The circuit includes a first diode, second diode, first capacitor, passing element, and ballast resistor that work together to automatically adjust bias current intensity, enabling the system to operate efficiently across low, middle, and high power sections without manual intervention.
Solution Approach 2:
The patent changes the bias current parameter dynamically by using diodes and capacitors to regulate current intensity. The first diode and second diode in series with the passing element create different conduction states that adjust the bias current parameter according to the power amplifier's operating section, thereby optimizing both linearity and power-added efficiency for each operating range.
3Adaptability or versatility
If signal amplitude changes randomly in modulation mode, then communication flexibility is improved, but linearity deteriorates when power gain changes greatly
Solution Approach 1:
The patent implements feedback by feeding back a portion of the power amplifier's output signal to the linearization circuit. This feedback signal is processed through the diode-capacitor network to generate corrective bias adjustments that compensate for gain variations, thereby maintaining linearity despite random signal amplitude changes in modulation mode.
Solution Approach 2:
The linearization circuit acts as an intermediary between the power amplifier output and the bias generation system. It processes the feedback signal through diodes and capacitors to create intermediate control signals that adjust the bias current, serving as a mediator that translates output variations into appropriate bias corrections to maintain linearity.
Data Source
AI summary
Disclosed are a radiofrequency power amplifier module having high linearity and power-added efficiency and an implementation method. The radiofrequency power amplifier module comprises a bias circuit, a linearization circuit, and a power amplifier circuit. The power amplifier circuit is connected to the linearization circuit. The linearization circuit is connected to the bias circuit. The bias circuit is connected to the power amplifier circuit. In the present invention, the linearization circuit is utilized to capture a radiofrequency signal inputted from a radiofrequency signal input end of the power amplifier circuit, the captured radiofrequency signal is fed back to the bias circuit, a corresponding bias current is generated by the bias circuit on the basis of the radiofrequency signal fed back, and the bias current is inputted to the power amplifier circuit, thus increasing the linearity and power-added efficiency of an output signal of the radiofrequency power amplifier.