Integrated Directional Coupler Circuit Without PA Insertion Loss
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Solution Overview
Problem
Conventional power amplifiers (PAs) face inefficiencies due to directional couplers causing insertion loss and non-directional passive tap networks leading to incorrect monitoring and reduced RF power output, which affects automated gain control and system efficiency.
Innovation Solution
Integration of a directional coupler within the power amplifier circuitry, utilizing a virtual ground node and nulling circuitry to separate forward and reverse signals, eliminating insertion loss and ensuring accurate monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a directional coupler is used to separate forward and reverse signals, then measurement accuracy is improved, but insertion loss increases and RF power output decreases
Solution Approach 1:
The patent merges the directional coupler functionality directly into the power amplifier circuit by integrating the coupling network with the amplifier stages. This integration eliminates separate coupling components that would introduce additional insertion loss, while maintaining the ability to separately measure forward and reverse signals through the integrated circuit architecture.
Solution Approach 2:
The power amplifier circuit is designed to perform multiple functions simultaneously: it amplifies the RF signal, provides directional coupling for measurement, and enables automated gain control. The integrated circuit serves as both the amplifier and the directional coupler, eliminating the need for separate external coupling components that would cause insertion loss.
2Device complexity
If a passive tap network is used for signal monitoring, then device complexity is reduced, but measurement accuracy deteriorates due to inability to separate forward and reverse signals
Solution Approach 1:
The patent combines the directional coupling capability with the power amplifier stages, creating an integrated circuit that provides both amplification and directional signal separation. This integration maintains measurement accuracy by preserving the directional properties while simplifying the overall device by eliminating separate passive tap networks.
3Measurement precision
If external directional coupler components are used, then signal separation is achieved, but device complexity and insertion loss increase
Solution Approach 1:
The patent integrates the directional coupler functionality directly into the power amplifier circuit by incorporating the coupling network within the amplifier stages. This integration eliminates the need for separate external coupler components, reducing device complexity while maintaining the ability to separate forward and reverse signals through the integrated circuit architecture.
Data Source
AI summary
Systems and methods that integrate a directional coupling function with directivity that does not have output loss are disclosed. For example, a power amplifier circuit arrangement includes an input terminal to receive an input signal; amplifier circuitry including a first amplifier stage, a second amplifier stage, and a virtual ground node, where an input of the first amplifier stage is coupled to the input terminal, an output of the first amplifier stage is coupled to an input of the second amplifier stage via the virtual ground node, and an output of the second amplifier stage is coupled to the input of the first amplifier stage via feedback circuitry; an output terminal coupled to the output of the second amplifier stage, the output terminal to output an amplified signal; and a directional coupler terminal coupled to the virtual ground node.