Power Amplifier Module With Receive-Band Noise Attenuation
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Solution Overview
Problem
Power amplifier modules in mobile communication devices face low reception sensitivity due to noise amplification in frequency bands with narrow transmit/receive frequency intervals, as they amplify noise overlapping with the receive frequency band.
Innovation Solution
A power amplification module with separate amplification circuits and an attenuation circuit to specifically address noise reduction in frequency bands with narrow transmit/receive frequency intervals, using distinct power amplification circuits and matching networks for each band, and optionally incorporating a filter circuit to attenuate receive frequency band components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a power amplifier module amplifies signals in frequency bands with narrow transmit/receive frequency intervals, then the signal amplification is achieved, but noise overlapping with the receive frequency band is also amplified, resulting in low reception sensitivity
Solution Approach 1:
The power amplifier module is divided into multiple independent amplification circuits, each dedicated to a specific frequency band. This segmentation allows selective amplification of transmit signals while preventing amplification of noise in receive frequency bands, thereby resolving the contradiction between signal amplification and noise suppression.
Solution Approach 2:
An attenuation circuit is introduced as an intermediary component between the amplification circuits and the output. This attenuation circuit selectively attenuates noise components in the receive frequency band while allowing the transmit signal to pass through, thus preventing noise amplification without affecting the desired signal amplification.
2Object-affected harmful factors
If separate amplification circuits are used for each frequency band, then noise in receive frequency bands can be prevented from being amplified, but the device complexity increases
Solution Approach 1:
The amplification circuits are designed with multi-functionality to handle multiple frequency bands. Each amplification circuit can be configured to operate in different modes (first amplification mode, second amplification mode, third amplification mode) depending on the frequency band requirements, reducing the need for completely separate circuits for each band while still preventing noise amplification.
Solution Approach 2:
The power amplifier module dynamically switches between different amplification modes based on the operating frequency band. This dynamic configuration allows the system to use fewer physical amplification circuits while achieving the effect of separate amplification for each band, thereby reducing device complexity while maintaining noise prevention capabilities.
Data Source
AI summary
A power amplification module includes a first input terminal that receives a first transmit signal in a first frequency band, a second input terminal that receives a second transmit signal in a second frequency band having a narrower transmit/receive frequency interval than the first frequency band, a first amplification circuit that receives and amplifies the first transmit signal to produce a first amplified signal and outputs the first amplified signal, a second amplification circuit that receives and amplifies the second transmit signal to produce a second amplified signal and outputs the second amplified signal, a third amplification circuit that receives and amplifies the first or second amplified signal to produce an output signal and outputs the output signal, and an attenuation circuit located between the second input terminal and the second amplification circuit and configured to attenuate a receive frequency band component of the second frequency band.