Multi-Gain LNA Circuit for Concurrent Wireless Signal Amplification
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Solution Overview
Problem
Current receiver devices with low noise amplifiers (LNAs) face challenges in simultaneously amplifying multiple wireless signals of different power levels, as setting a lower gain to prevent saturation of higher power signals results in inadequate amplification and increased noise for lower power signals.
Innovation Solution
The proposed solution involves a low noise amplifier (LNA) circuit with an input stage and two output stages, each configured to generate a bias signal and controlled output signals for setting specific gains, allowing for independent amplification of multiple wireless communications, such as WLAN and Bluetooth, by adjusting the number of current paths turned on based on control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gain of the LNA is decreased to prevent saturation of higher power signals, then the higher power signals can be properly processed, but the lower power signals cannot be properly amplified and suffer from increased noise
Solution Approach 1:
The LNA is divided into multiple independent output stage circuits (first output stage circuit, second output stage circuit, etc.), each with its own gain control. This segmentation allows different gain levels to be applied to different signal paths simultaneously, enabling higher power signals to be processed with lower gain while lower power signals receive higher gain amplification through separate paths.
Solution Approach 2:
Each output stage circuit is configured with different gain characteristics tailored to specific signal power levels. The first output stage circuit is optimized for higher power signals with lower gain, while the second output stage circuit is optimized for lower power signals with higher gain. This local quality differentiation ensures that each signal path has the appropriate gain setting for its specific requirements.
2Adaptability or versatility
If a single gain setting is used in the LNA, then the circuit structure remains simple, but multiple wireless signals with different power levels cannot be simultaneously amplified properly
Solution Approach 1:
The LNA is divided into multiple independent output stage circuits (first output stage circuit, second output stage circuit, etc.), each with its own gain control. This segmentation allows different gain levels to be applied to different signal paths simultaneously, enabling higher power signals to be processed with lower gain while lower power signals receive higher gain amplification through separate paths.
Solution Approach 2:
The LNA circuit is designed to handle multiple wireless communication standards (e.g., WLAN, Bluetooth) with different power levels using a unified structure. Each output stage circuit can be independently controlled to serve different communication protocols, making the single LNA device universal for multiple applications while maintaining relatively simple overall architecture.
Data Source
AI summary
A low noise amplifier circuit includes an input stage circuit, a first output stage circuit, and a second output stage circuit. The input stage circuit is configured to receive an input signal and to generate a bias signal. The first output stage circuit corresponding to a first wireless communication and is configured to be biased according to the bias signal and a first control signal, in order to generate a first output signal, in which the first control signal is for setting a first gain of the first output stage circuit. The second output stage circuit corresponding to a second wireless communication and is configured to be biased according to the bias signal and a second control signal, in order to generate a second output signal, in which the second control signal is for setting a second gain of the second output stage circuit.