LNA Bypass Switching Without External Control Voltage
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Solution Overview
Problem
Existing low noise amplifiers (LNAs) with bypass circuits face issues such as power consumption and the need for additional control voltages in passive modes, limiting gain and efficiency, especially when handling high-level input signals and wideband signals.
Innovation Solution
A telecommunication signal amplification system with two operational modes: amplification mode and signal passing mode, utilizing a polarization network to generate control voltage values that allow the amplification module, switching module, and bypass module to operate independently without physical switches, achieving high gain and zero energy consumption in passive mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a bypass circuit is activated to allow signal passage without amplification, then the LNA can handle high-level input signals without saturation, but the bypass circuit consumes power when activated
Solution Approach 1:
The LNA uses its own amplified signal to control the bypass switching, eliminating the need for external control voltages. The amplified output signal feeds back to control the bypass circuit activation, making the system self-regulating and energy-efficient.
Solution Approach 2:
The system implements feedback by using the amplified signal from the LNA to control the bypass circuit. This feedback mechanism automatically activates the bypass when the amplified signal indicates high input levels, preventing saturation while minimizing power consumption.
2Object-affected harmful factors
If a bypass circuit is used to switch input signal to output without amplification, then saturation effects are avoided, but an additional external control element is needed
Solution Approach 1:
The LNA uses its own amplified signal to control the bypass switching, eliminating the need for external control voltages. The amplified output signal feeds back to control the bypass circuit activation, making the system self-regulating and energy-efficient.
Solution Approach 2:
The LNA performs dual functions: it amplifies the input signal and simultaneously uses this amplified signal to control the bypass circuit. This multi-functionality reduces the need for separate control elements and simplifies the overall system architecture.
3Reliability
If the LNA gain is increased to improve sensitivity, then the receiver sensitivity increases, but saturation effects and intermodulation degradation occur in high-level signal environments
Solution Approach 1:
The LNA gain is made dynamic through the bypass circuit that can switch between amplified and non-amplified signal paths. This dynamic configuration allows the system to adapt to different input signal levels, providing high gain for weak signals and bypass mode for strong signals to avoid saturation and intermodulation.
Solution Approach 2:
The system changes the gain parameter dynamically by switching between two operational modes: amplified mode for low-level signals and bypass mode for high-level signals. This parameter change prevents intermodulation degradation while maintaining receiver sensitivity.
Data Source
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AI summary
The present invention relates to a system for the amplification of telecommunication signals (SA), in particular for the amplification of radio, television and/or data signals, comprising an input (IN), an output (OUT), an amplification module (1), a switching module (2), a bypass module (3) and an internal and/or external polarization network (4), and having two modes of operation: a first mode of operation in which the signal present at the input (IN) is located at the output (OUT) through the bypass module; and a second mode of operation in which the signal present at the input (IN) is located at the output (OUT) amplified through the amplification module.