Broadband Tuner Amplifier Control for Linearity and Power Trade-Off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Broadband amplifiers face challenges in maintaining linearity and minimizing distortion across varying signal power levels, especially when handling multiple discrete carrier signals with differing strengths, as they often operate outside their optimal dynamic range, leading to excessive distortion and increased noise.
Innovation Solution
Dynamic control of broadband amplifier circuits using a power detector and control unit to adjust operating points based on total signal power levels, ensuring minimum acceptable linearity and maximum allowable distortion, thereby maintaining performance criteria and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the broadband amplifier operates to accommodate the highest anticipated total signal power level, then distortion is minimized, but noise figure deteriorates and power consumption increases
Solution Approach 1:
The amplifier operates at different points along its operating curve dynamically adjusted according to total signal power level. A power detector monitors the total power level of broadband signals, and based on this detection, the amplifier's operating point is shifted to maintain optimal linearity only when necessary, reducing power consumption during normal operation while preventing distortion during high signal power conditions
Solution Approach 2:
A power detector provides feedback about the total signal power level to the amplifier control mechanism. This feedback loop enables the system to automatically adjust its operating characteristics in response to changing signal conditions, maintaining distortion performance when needed while optimizing power consumption under normal conditions
2Object-generated harmful factors
If the broadband amplifier operates to accommodate the highest anticipated total signal power level, then distortion is minimized, but noise figure deteriorates
Solution Approach 1:
The amplifier dynamically adjusts its operating point along the operating curve based on detected total signal power levels. By operating at optimized points rather than consistently at the worst-case high-power point, the system maintains low distortion when signal power is high while achieving better noise figure during normal operation, thus resolving the trade-off between these two performance parameters
3Stability of the object's composition
If the broadband amplifier is designed for worst case highest total signal power, then linearity is maintained, but device complexity increases
Solution Approach 1:
The amplifier system performs self-adjustment through automatic power level detection and operating point modification. The power detector and control mechanism enable the amplifier to autonomously adapt its characteristics to match actual signal conditions, maintaining linearity when required without needing complex external control systems or manual adjustment mechanisms
Data Source
AI summary
A broadband signal amplifier includes one of more broadband amplifier circuits, each dynamically controlled in response to a total power level of signals applied thereto to reduce linearity in response to a reduction of input signal strength. A filter may couple the output of the broadband amplifier circuits to each other to form a tandem arrangement. Power detectors are connected to detect and provide outputs indicative of the total power levels of the signals applied to respective broadband amplifiers. A control unit is connected to and receives the output from the power detectors and, in response, provides a control signals to the broadband amplifier circuit so as to operate each over portions of their operating characteristic curves that provide only that degree of linearity necessary to limit distortion to a predetermined or dynamically adjustable maximum acceptable level.