Power Amplifier Module Switch Layout for Noise Isolation
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Solution Overview
Problem
In power amplifier modules for mobile communication terminals, noise from the power supply circuit can be induced and amplified due to electromagnetic or electrostatic interference, affecting the performance of the power amplifier circuit.
Innovation Solution
The power supply circuit is integrated into the second switch circuit, which is positioned further away from the power amplifier circuit, reducing the likelihood of noise interference and allowing the first switch circuit to be smaller in size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the power supply circuit is incorporated in the switch near the power amplifier circuit, then the switch system can be reduced in size, but noise from the power supply circuit may be induced and amplified by the power amplifier circuit
Solution Approach 1:
The power supply circuit is extracted from the first switch circuit (near the power amplifier) and relocated to the second switch circuit (far from the power amplifier). This separation removes the noise source from proximity to the sensitive power amplifier circuit while maintaining the functional integrity of the switch system.
Solution Approach 2:
The second switch circuit acts as an intermediary carrier for the power supply circuit. By placing the power supply circuit in the second switch circuit, which is positioned away from the power amplifier, the noise interference is minimized while still providing necessary power supply functionality to the system.
2Object-affected harmful factors
If the power supply circuit is placed far from the power amplifier circuit, then noise interference is reduced, but the overall module size may increase
Solution Approach 1:
The power supply circuit is merged with the second switch circuit, which is already present in the system and positioned away from the power amplifier. This integration allows the power supply circuit to be located in a noise-friendly position without requiring additional space or components, as it shares the physical and functional space of the existing second switch circuit.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively minimizes the influence of noise from the power supply circuit on the power amplifier circuit, improving the overall performance and reducing the size of the power amplifier module.
Implementation Method 1
a power amplifier circuit that amplifies an input signal and outputs an amplified signal
Implementation Method 2
noise caused by the switching on and off of a power supply circuit may be input to a power amplifier circuit due to electromagnetic induction, electrostatic induction, or the like
Implementation Method 3
noise caused by the switching on and off of a power supply circuit may be input to a power amplifier circuit due to electromagnetic induction, electrostatic induction, or the like
Data Source
AI summary
A power amplifier module includes a first power amplifier that amplifies an input signal and outputs a first transmission signal; a first switch circuit that receives input of the first transmission signal and performs switching to, of a plurality of signal paths, a signal path through which the first transmission signal passes; and a second switch circuit that receives input of the first transmission signal output from the first switch circuit through the signal path to which the first switch circuit has performed switching and switches between signal paths to an antenna terminal. The second switch circuit includes a power supply circuit that supplies a reference voltage to the first switch circuit and the second switch circuit.