Dual-Branch RF Circuit With Outphasing for Power Back-Off Efficiency
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Solution Overview
Problem
Conventional dual-input radio frequency circuits suffer from reduced efficiency between power back-off and high power points, leading to increased energy consumption and high costs, and existing composite circuits with three input signals struggle to achieve optimal power amplification efficiency due to inflexible signal adjustments.
Innovation Solution
A radio frequency circuit design that includes a first circuit for splitting and phase-adjusting input signals, and a second circuit with a primary and secondary power amplifier branch, where the primary branch uses an outphasing circuit and the secondary branch uses a secondary power amplifier, allowing for optimal parameter adjustment of input signals to maximize efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a composite radio frequency circuit combining DHT circuit and outphasing circuit is used to improve efficiency between power back-off point and high power point, then power amplification efficiency is improved, but the quantity of input signals increases from two to three and the size of the circuit becomes excessively large
Solution Approach 1:
The invention divides the power amplifier into two separate branches: a primary power amplifier branch using outphasing circuit and a secondary power amplifier branch using DHT circuit. Each branch processes different input signals independently, allowing the system to achieve high efficiency across different power levels without requiring all three input signals to be present simultaneously. This segmentation reduces the effective circuit complexity compared to a fully integrated three-input composite circuit.
2Loss of energy
If three input signals are provided to the composite radio frequency circuit, then power amplification efficiency is improved, but three transmit channels need to be disposed and use costs increase
Solution Approach 1:
The primary and secondary power amplifier branches can process different types of input signals (e.g., different modulated waves or frequency ranges). This multi-functionality allows the circuit to achieve high efficiency across various operating conditions without requiring three separate dedicated transmit channels, thereby reducing overall system costs while maintaining improved power amplification efficiency.
3Productivity
If signals from two transmit channels are converted into three input signals by splitting or combination, then the composite radio frequency circuit can operate, but at least one input signal cannot be adjusted to expected value and optimal power amplification efficiency cannot be reached
Solution Approach 1:
The invention introduces dynamic adjustment mechanisms in both the primary and secondary power amplifier branches, allowing the amplitude and phase of input signals to be adaptively controlled. This dynamic capability enables each branch to optimize its input signal parameters in real-time based on operating conditions, ensuring that optimal power amplification efficiency can be achieved even when starting from two transmit channels rather than three fixed inputs.
Data Source
AI summary
The application provides a radio frequency circuit, including: a first circuit and a second circuit. The first circuit is configured to receive a first signal and a second signal; split the first signal into a third signal and a fourth signal, and split the second signal into a fifth signal and a sixth signal; adjust a phase of the fifth signal to obtain a seventh signal; and combine the seventh signal and the third signal into an eighth signal. The second circuit includes a primary power amplifier branch and a secondary power amplifier branch, and the primary power amplifier branch is configured to process the fourth signal and the sixth signal, and the secondary power amplifier branch is configured to process the eighth signal.