Power Amplifier Bias Switching for Low-Power RF Transmission
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Solution Overview
Problem
High power consumption by power amplifiers in electronic devices supporting wireless communication leads to increased heat generation and potential circuit burnout, especially when operating in low power regions, and existing technologies fail to stabilize bias voltage supply effectively.
Innovation Solution
A transmission device and electronic device design that utilizes multiple power suppliers and a switch to provide stable bias voltages to power amplifiers, allowing for efficient power management and preventing circuit burnout by selectively using different bias voltages based on envelope detection signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power amplifier operates in a low power region with high supply voltage, then the bias voltage can be maintained, but power consumption increases due to heat generation
Solution Approach 1:
The patent implements dynamic bias voltage adjustment by switching between different power suppliers (first power supplier for high voltage, second power supplier for low voltage) based on the operating power region. This dynamic adaptation allows the system to optimize power consumption while maintaining reliable bias voltage supply across different operating conditions.
Solution Approach 2:
The system changes the voltage parameter by selecting different power suppliers based on the envelope detection signal. When the envelope signal indicates low power region operation, the system switches to the second power supplier providing lower voltage, thereby reducing power consumption while maintaining adequate bias voltage for stable operation.
2Use of energy by moving object
If multiple power suppliers are used to provide different bias voltages, then power consumption can be optimized, but device complexity increases
Solution Approach 1:
The patent introduces a switch as an intermediary component that selectively connects the power amplifier to either the first power supplier or the second power supplier based on the envelope detection signal. This intermediary element simplifies the overall system architecture by providing a clean switching mechanism rather than requiring complex parallel power delivery networks.
Solution Approach 2:
The power supply function is segmented into two separate power suppliers, each optimized for different operating regions. The first power supplier provides high voltage for high power operation, while the second power supplier provides low voltage for low power operation. This segmentation allows each power supplier to be optimized for its specific function, reducing overall system complexity.
3Device complexity
If a single power amplifier is shared for dual transmission, then device complexity is reduced, but the risk of circuit burnout due to software errors increases
Solution Approach 1:
The patent implements protective measures by providing multiple power suppliers with different voltage levels and using envelope detection to monitor operating conditions. This beforehand cushioning ensures that even if software errors occur during shared power amplifier operation, the system can detect abnormal conditions and switch to safer operating modes, preventing circuit burnout.
Data Source
AI summary
An example electronic device may include a switch configured to perform switching using at least two bias voltages input from a plurality of power suppliers as an input thereto and one of the two bias voltages as an output therefrom; and a first power amplifier which is included in at least one first transmission chain capable of selectively supporting the heterogeneous network among a plurality of transmission chains, and which is configured to amplify a radio frequency signal for transmission based on the bias voltage supplied from the switch.