Shared 2G/5G Power Amplifier Path With Attenuator Noise Control
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Solution Overview
Problem
Existing RF communication systems face challenges in efficiently supporting both second generation (2G) and fifth generation (5G) cellular transmit signals, particularly in managing power amplifier design and noise margins, which can be costly and inefficient due to separate solutions for different frequency bands.
Innovation Solution
A power amplifier system with a controllable attenuator and multi-throw switch, utilizing a 5G power amplifier to amplify both 2G and 5G signals by adding a controllable attenuator to manage impedance and noise, allowing for efficient re-use of 5G amplifiers for 2G transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power amplifiers are used for 2G and 5G signals, then each signal can be amplified with dedicated optimization, but device complexity and cost increase
Solution Approach 1:
The power amplifier is designed to handle both 2G and 5G signals through a single multi-functional device. The system uses a multi-throw switch to route different frequency signals to the same power amplifier, which is capable of operating across a wide frequency range covering both 2G (e.g., 850-960 MHz) and 5G (e.g., 2.4-2.8 GHz) bands, thereby eliminating the need for separate dedicated amplifiers for each generation
Solution Approach 2:
The patent combines the 2G and 5G power amplifier paths into a single shared power amplifier. By merging the previously separate amplification chains and using a switching mechanism to select between 2G and 5G input signals, the system achieves consolidation while maintaining the ability to amplify both signal types with a single device
2Device complexity
If a 5G power amplifier is used for 2G signals, then cost and device complexity are reduced, but impedance matching and noise control become challenging
Solution Approach 1:
The system dynamically adjusts the operating conditions of the power amplifier based on the selected signal type. When handling 2G signals, the power amplifier operates in a regime optimized for lower frequencies with appropriate impedance matching networks. The multi-throw switch enables dynamic reconfiguration of the signal path, allowing the same amplifier to be optimally tuned for different frequency ranges and signal characteristics
Solution Approach 2:
Impedance matching networks and filtering components are introduced as intermediary elements between the multi-throw switch and the power amplifier. These intermediaries adapt the impedance characteristics of 2G signals to match the optimal input requirements of the 5G-designed power amplifier, thereby resolving the impedance mismatch issue while enabling cost-effective consolidation
3Device complexity
If a 5G power amplifier is used for 2G signals, then cost and device complexity are reduced, but noise margin management becomes difficult
Solution Approach 1:
The system segments the signal processing path by using a multi-throw switch to separate 2G and 5G signal routes before they converge at the power amplifier. This segmentation allows for generation-specific preprocessing, including generation-optimized filtering and attenuation control, to be applied before the signals are combined and amplified, thereby managing noise margins effectively for each signal type
Data Source
AI summary
Apparatus and methods for power amplifier consolidation are disclosed. In certain embodiments, a power amplifier system includes a controllable attenuator that generates a 2G cellular transmit signal, a multi-throw switch including a first input that receives the 2G cellular transmit signal and a second input that receives a 5G cellular transmit signal, and a power amplifier including an input electrically connected an output of the multi-throw switch. The power amplifier amplifies the 2G cellular transmit signal in a first mode and amplifies the 5G cellular transmit signal in a second mode.