RF Power Amplifier Current Reuse Across Stages to Cut Power Loss
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Solution Overview
Problem
Designing a satisfactory radio-frequency power amplifier for electronic devices is challenging due to power losses incurred along the transmit path, leading to increased power consumption.
Innovation Solution
Implementing a current reuse scheme between amplifier stages using a more efficiently generated power supply voltage, where the upstream stage operates with a first power supply voltage and the downstream stage with a second power supply voltage and ground, allowing for supplemental current supply to the downstream stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional power amplifier stages are used with separate power supplies, then each stage can operate independently, but power consumption increases due to power losses along the transmit path
Solution Approach 1:
The patent merges the power supply systems of multiple amplifier stages by connecting them in a daisy-chain configuration where the power supply of one stage is also connected to the power supply of the next stage. This combining approach allows power to be efficiently distributed across stages, reducing overall power consumption and minimizing power losses along the transmit path.
Solution Approach 2:
The power supply voltage line serves multiple functions simultaneously: it provides power to the upstream amplifier stage and also supplies supplemental current to the downstream amplifier stage. This multi-functionality reduces the need for separate power supplies for each stage, thereby reducing total power consumption and energy losses.
2Use of energy by moving object
If current reuse is implemented between amplifier stages, then power consumption is reduced, but the circuit complexity increases
Solution Approach 1:
The patent combines multiple amplifier stages and their power supply circuits into a unified structure where power supply voltage lines are shared between stages. This merging reduces the total number of separate power supply circuits needed, thereby reducing circuit complexity while still achieving current reuse and lower power consumption.
Solution Approach 2:
The power supply voltage line is designed to serve multiple amplifier stages simultaneously, creating a universal power distribution path. This multi-functional design simplifies the overall circuit architecture compared to having dedicated power supplies for each stage, reducing circuit complexity while enabling current reuse.
3Power
If supplemental current is provided to the downstream amplifier stage, then signal amplification is improved, but power consumption increases
Solution Approach 1:
The patent combines the power supply paths of upstream and downstream amplifier stages by connecting them to a shared power supply voltage line. This merging allows the downstream stage to receive supplemental current from the same power supply that powers the upstream stage, improving signal amplification without requiring additional dedicated power sources, thereby avoiding increased overall power consumption.
Solution Approach 2:
The power supply voltage line is designed to universally serve both upstream and downstream amplifier stages, providing supplemental current to the downstream stage as one of its functions. This multi-functional power supply improves signal amplification capability while maintaining efficient power usage, as the same power source serves multiple purposes across different stages.
Data Source
AI summary
An electronic device may include wireless circuitry with a processor, a transceiver, an antenna, and a front-end module coupled between the transceiver and the antenna. The front-end module may include one or more power amplifiers for amplifying a signal for transmission through the antenna. A power amplifier may include multiple amplifier stages. Current sharing or reuse may occur between two amplifier stages in the power amplifier via a current flow path between the two amplifier stages. A power supply voltage line may be connected to the current flow path and may provide the downstream amplifier stage with a supplemental supply current based on which the downstream amplifier stage can amplify a radio-frequency signal received from the upstream amplifier stage.