Programmable PA Decoupling Circuits for RF Power Amplifier Bandwidth Optimization
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Solution Overview
Problem
Wireless communication devices face challenges in supporting multiple protocols with specific performance requirements, such as out-of-band emissions and linearity, while being compact, cost-effective, and power-efficient, especially with the need for efficient RF circuitry that can handle envelope tracking and average power tracking without compromising decoupling capabilities.
Innovation Solution
The implementation of a power supply system that includes a PA power supply and RF PA circuitry with programmable decoupling circuits, which provide partial decoupling of RF PAs from other circuitry, allowing for efficient envelope tracking and average power tracking while managing bandwidth and capacitance requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a PA power supply provides output signals to multiple RF PAs and decoupling circuits, then power efficiency and integration are improved, but bandwidth limitations and decoupling effectiveness deteriorate
Solution Approach 1:
The patent divides the decoupling function into separate decoupling circuits for each RF PA, allowing independent optimization of decoupling capacitance for each power output signal. This segmentation enables each RF PA to maintain effective decoupling even when sharing a common power supply, resolving the contradiction between power efficiency and decoupling effectiveness.
Solution Approach 2:
The patent applies different decoupling capacitance values to different RF PAs based on their specific bandwidth requirements and operating characteristics. By tailoring the decoupling capacitance locally to each RF PA's needs, the system maintains optimal decoupling effectiveness for each component while sharing the common power supply, thus resolving the contradiction between power efficiency and decoupling effectiveness.
2Reliability
If decoupling capacitance is increased to improve decoupling effectiveness, then decoupling performance is improved, but bandwidth of the power supply output signal deteriorates
Solution Approach 1:
The patent segments the total decoupling capacitance into individual decoupling circuits for each RF PA. This allows the system to achieve the beneficial low-impedance decoupling effect without concentrating all capacitance in a single location that would create a low-pass filter effect on the common power supply signal, thus maintaining bandwidth while improving decoupling effectiveness.
Solution Approach 2:
The patent distributes decoupling capacitance across multiple parallel paths (one for each RF PA) rather than using a single series path. This dimensional change from series to parallel configuration allows the system to achieve low decoupling impedance without creating a low-pass filter effect on the power supply signal, thus resolving the contradiction between decoupling effectiveness and bandwidth.
3Device complexity
If multiple RF PAs share a common power supply to reduce device complexity, then device simplicity and cost are improved, but interference between PAs and decoupling capability deteriorates
Solution Approach 1:
The patent segments the power distribution into separate decoupling circuits for each RF PA while maintaining a common power supply source. This segmentation provides electrical isolation between PAs through individual decoupling capacitance, preventing interference between PAs while maintaining the simplicity and cost benefits of a shared power supply architecture.
Solution Approach 2:
The patent introduces individual decoupling circuits as intermediary elements between the common power supply and each RF PA. These decoupling circuits act as mediators that isolate each RF PA from voltage fluctuations and interference generated by other PAs, while still allowing all PAs to share the common power supply, thus resolving the contradiction between device simplicity and interference prevention.
Data Source
AI summary
Circuitry, which includes a PA power supply and RF PA circuitry, is disclosed. The RF PA circuitry includes a group of RF PAs and a group of PA decoupling circuits. The group of RF PAs includes a first RF PA and a second RF PA. The group of PA decoupling circuits includes a first PA decoupling circuit and a second PA decoupling circuit. The PA power supply provides a first PA power supply output signal to at least one of the group of RF PAs and to at least one of the group of PA decoupling circuits. The first PA decoupling circuit is coupled across the first RF PA, is programmable, and at least partially decouples the first RF PA from other circuitry. The second PA decoupling circuit is coupled across the second RF PA and at least partially decouples the second RF PA from other circuitry.