Multi-Mode Power Amplifier Without RF Switches or Large Inductors
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Solution Overview
Problem
Existing multiple mode power amplifiers for wireless communication devices face inefficiencies due to the need for RF switches, which increase costs and reduce efficiency, and phase differences between amplifying stages leading to power loss, while also requiring large inductors for low power modes, compromising device size.
Innovation Solution
A multiple mode power amplifier design that eliminates the need for an RF switch by using impedance matching networks to reduce phase differences between amplifying stages and employs capacitors to achieve high inductance without large inductors, optimizing power modes and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an RF switch is used to switch between high power mode and low power mode, then mode switching is achieved, but device cost increases and overall efficiency decreases due to negative gain
Solution Approach 1:
The patent removes the RF switch from the power amplifier architecture entirely, extracting the problematic component that caused efficiency loss and cost increase. The mode switching function is achieved through alternative means (impedance matching networks) that do not require the RF switch, thereby eliminating its negative gain impact while maintaining adaptability between power modes.
Solution Approach 2:
The impedance matching networks are designed to serve multiple functions: they provide impedance matching for optimal power transfer and simultaneously enable mode switching between high power and low power operations. This multi-functionality replaces the dedicated RF switch, achieving adaptability without the associated efficiency penalties.
2Power
If two amplifying stages are used in high power mode, then power output is increased, but phase difference between stages causes power loss and efficiency decrease
Solution Approach 1:
The patent introduces impedance matching networks as intermediary components between the two amplifying stages and at their outputs. These networks act as mediators that adjust and equalize the phases of the signals from both stages, ensuring they are properly aligned when combined. This eliminates the phase difference problem while maintaining the power output benefits of using two amplifying stages.
Solution Approach 2:
The impedance matching networks dynamically adjust electrical parameters (impedance and phase) of the signals from the two amplifying stages. By changing these parameters through the matching networks, the patent ensures optimal phase alignment and impedance matching, thereby maximizing power output while minimizing power loss due to phase differences.
3Use of energy by stationary object
If an inductor of high inductance (2-4 nH) is used in low power mode to reduce output current, then power consumption is reduced, but inductor size increases and device size is compromised
Solution Approach 1:
The patent changes the operating parameters of the existing inductor by adjusting the impedance matching network configuration when switching to low power mode. This allows the system to achieve the desired current reduction and power consumption levels without requiring a physically larger inductor with higher inductance value, thereby maintaining compact device size.
Solution Approach 2:
The patent employs dynamic impedance matching networks that can adjust their characteristics based on the operating mode. In low power mode, these networks dynamically modify the electrical parameters to achieve current reduction, replacing the need for a statically larger inductor with a dynamically adjustable system that maintains compact dimensions.
Data Source
AI summary
In a representative embodiment, a multiple mode power amplifier that is operable in a first power mode and a second power mode. The multiple mode power amplifier comprises a first amplifying unit; a second amplifying unit; a first impedance matching network connected to an output port of the first amplifying unit; a second impedance matching network connected to an output port of the second amplifying unit and to the first impedance matching network; and a third impedance matching network connected to the output ports of the first and the second amplifying units. The third impedance matching network reduces a phase difference between signals amplified by the first and the second amplifying units in the first mode.