Self-Configurable RF Amplifier for Noise Figure and Linearity
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Solution Overview
Problem
Conventional RF receiver amplifiers face challenges in simultaneously achieving low noise figure and high intermodulation intercept point, as increasing negative feedback degrades noise figure and reducing it lowers intercept performance, limiting dynamic range and increasing DC power consumption.
Innovation Solution
A self-configurable amplifier with an RF signal level detector and parametric adjustment circuit that dynamically adjusts gain and feedback based on signal conditions, using a combination of negative feedback and adjustable DC current to optimize noise figure and intercept point in response to varying signal strengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If negative feedback is increased to improve linearity and intercept point, then intermodulation performance is improved, but noise figure degrades
Solution Approach 1:
The patent applies dynamic adjustment of feedback amount based on signal strength conditions. The system transitions from fixed feedback to variable feedback, where the feedback amount is automatically adjusted according to whether the signal is strong or weak, resolving the contradiction between linearity and noise figure
Solution Approach 2:
The patent changes the feedback parameter dynamically based on signal conditions. By modifying the feedback amount parameter in response to signal strength, the system achieves optimal intermodulation performance for strong signals while maintaining low noise figure for weak signals
2Object-affected harmful factors
If negative feedback is reduced to improve noise figure, then noise figure is improved, but intermodulation intercept point lowers
Solution Approach 1:
The system dynamically adjusts feedback based on signal conditions, allowing low feedback for weak signals (preserving noise figure) and high feedback for strong signals (improving intercept point). This dynamic adaptation resolves the contradiction
Solution Approach 2:
The feedback parameter is changed dynamically based on signal strength detection, enabling the system to optimize both noise figure and intercept point under different operating conditions
3Reliability
If fixed dynamic range is provided to achieve acceptable noise figure and intercept performance, then performance is acceptable over limited range, but DC power consumption increases
Solution Approach 1:
The patent transitions from fixed amplifier parameters to dynamic parameter adjustment based on signal conditions. The system adapts its operating characteristics to match actual signal strength, achieving consistent performance across wide dynamic range while optimizing power consumption
Solution Approach 2:
The system changes amplifier parameters dynamically based on detected signal conditions, enabling optimal performance across varying signal strengths without requiring high power consumption for all conditions
Data Source
AI summary
A self-configurable amplifier and method of amplification, including an RF signal level detector having an input connected to an RF signal, and an output configured to produce a control signal responsive to a power level of the RF signal. The control signal is supplied to a parametric adjustment circuit that includes an input connected to the control signal, and an output configured to provide a negative feedback responsive to the control signal. The negative feedback is supplied to an RF amplifier that includes an input forming an input of the self-configurable amplifier, an output forming an output of the self-configurable amplifier, and a control port connected to the output of the parametric adjustment circuit, such that one or more parameters of the RF amplifier is responsive to the negative feedback.