RF Power Amplifier Dynamic Voltage Switching for Multi-Signal Transmission
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Solution Overview
Problem
Conventional radio frequency circuits face a reduction in transmission power when simultaneously transmitting multiple radio frequency signals due to increased differences between peak and average power, leading to a higher load on power amplifiers.
Innovation Solution
The use of a radio frequency circuit with a power amplifier that applies a higher power-supply voltage (Vcc2) for simultaneous transmission of multiple radio frequency signals, where Vcc2 is greater than the power-supply voltage (Vcc1) used for single signal amplification, to alleviate the output power limitation and maintain transmission power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple radio frequency signals are simultaneously transmitted using a conventional power amplifier with fixed power-supply voltage, then the circuit complexity is reduced, but the transmission power is reduced due to increased peak-to-average power difference
Solution Approach 1:
The power amplifier dynamically switches between a first power-supply voltage for single signal transmission and a second power-supply voltage for simultaneous multi-signal transmission. This dynamic voltage adjustment enables the amplifier to adapt to different transmission scenarios, maintaining high transmission power when multiple signals are transmitted while keeping the circuit design relatively simple through a single power amplifier unit.
2Device complexity
If a single power amplifier is used to amplify multiple radio frequency signals simultaneously, then the device complexity is reduced, but the output power limitation increases due to higher load
Solution Approach 1:
The invention changes the power-supply voltage parameter of the power amplifier based on the transmission mode. When multiple radio frequency signals are simultaneously transmitted, the second power-supply voltage (higher than the first) is applied to the power amplifier, increasing its output power capability and overcoming the output power limitation that would otherwise occur due to the higher load from multiple signals.
3Power
If the power-supply voltage is increased for simultaneous transmission of multiple signals, then the transmission power is maintained, but the energy consumption increases
Solution Approach 1:
The power amplifier dynamically adjusts its power-supply voltage based on the actual transmission requirements. The voltage switching control unit monitors whether multiple signals are being transmitted simultaneously and only applies the higher second power-supply voltage when necessary. For single signal transmission, the lower first power-supply voltage is used, thereby maintaining transmission power when needed while minimizing energy consumption during normal operation.
Data Source
AI summary
A radio frequency circuit includes an amplifier capable of amplifying a first radio frequency signal and a second radio frequency signal that has a frequency different from a frequency of the first radio frequency signal. Here, the amplifier uses a first power-supply voltage to amplify one of the first radio frequency signal and the second radio frequency signal and uses a second power-supply voltage to amplify both the first radio frequency signal and the second radio frequency signal together. A value of the second power-supply voltage is greater than a value of the first power-supply voltage.