SIMO RF Amplifiers With Independent Gain for Mixed Signal Levels
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Solution Overview
Problem
Wireless devices face challenges in receiving multiple transmitted signals at different frequencies and power levels due to the limitations of single-input multiple-output (SIMO) amplifiers, which can lead to signal saturation or low sensitivity when using a single gain for all signals.
Innovation Solution
The implementation of SIMO amplifiers with separate gain control for each output allows for independent gain adjustment for different transmitted signals, enabling the use of low gain for strong signals and high gain for weak signals, thereby avoiding saturation and improving sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gain is used for all transmitted signals in SIMO amplifiers, then the device complexity is reduced, but the sensitivity for weak signals deteriorates and saturation occurs for strong signals
Solution Approach 1:
The patent divides the amplifier into multiple independent output paths, each with its own gain control mechanism. The SIMO amplifier structure separates the single gain control into multiple independent gain controls for each output signal, allowing each signal path to be optimized independently for its specific signal strength requirements.
Solution Approach 2:
The patent implements dynamic gain adjustment for each output path based on the received signal strength. The gain control is made variable and adaptive, allowing the amplifier to dynamically adjust the gain for each output according to the specific signal conditions, transitioning from a static single gain to dynamic multiple gains.
2Measurement precision
If high gain is used to improve sensitivity for weak signals, then sensitivity is improved, but signal saturation occurs for strong signals
Solution Approach 1:
The patent applies different gain values to different output paths based on their specific signal strength requirements. Each output path receives a tailored gain setting appropriate for its signal conditions, rather than applying a uniform gain across all paths. This local optimization prevents both saturation and ensures sufficient sensitivity.
Solution Approach 2:
The patent changes the gain parameter independently for each output path based on the received signal strength indicators. The system adjusts the gain parameter dynamically for each signal path, selecting appropriate gain values to match the specific signal conditions of each transmitted signal being received.
3Object-affected harmful factors
If low gain is used to prevent saturation for strong signals, then saturation is avoided, but sensitivity for weak signals deteriorates
Solution Approach 1:
The patent makes the gain control dynamic and adaptive for each output path. Rather than using a fixed low gain to prevent saturation, the system dynamically adjusts the gain for each path based on real-time signal strength measurements, allowing weak signals to receive higher gain while strong signals receive lower gain.
Solution Approach 2:
The patent changes the gain parameter independently for each output path based on received signal strength indicators. The system selects and applies appropriate gain values for each path, transitioning from a static single gain parameter to dynamic per-path gain parameters that adapt to signal conditions.
Data Source
AI summary
Amplifiers with multiple outputs and separate gain control per output are disclosed. In an exemplary design, an apparatus (e.g., a wireless device or an integrated circuit) may include first and second amplifier circuits. The first amplifier circuit may receive and amplify an input radio frequency (RF) signal based on a first variable gain and provide a first amplified RF signal. The second amplifier circuit may receive and amplify the input RF signal based on a second variable gain and provide a second amplified RF signal. The input RF signal may include a plurality of transmitted signals being received by the wireless device. The first variable gain may be adjustable independently of the second variable gain. Each variable gain may be set based on the received power level of at least one transmitted signal being received by the wireless device.